redis配置文件说明

之前说了下redis windows下的配置和PHP的使用，这次我们说下redis配置文件的详细说明。

指定包含其它的配置文件，可以在同一主机上多个Redis实例之间使用同一份配置文件，而同时各个实例又拥有自己的特定配置文件

#&nbsp;Redis&nbsp;configuration&nbsp;file&nbsp;example
&nbsp;
#&nbsp;Note&nbsp;on&nbsp;units:&nbsp;when&nbsp;memory&nbsp;size&nbsp;is&nbsp;needed,&nbsp;it&nbsp;is&nbsp;possible&nbsp;to&nbsp;specifiy
#&nbsp;it&nbsp;in&nbsp;the&nbsp;usual&nbsp;form&nbsp;of&nbsp;1k&nbsp;5GB&nbsp;4M&nbsp;and&nbsp;so&nbsp;forth:
#
#&nbsp;1k&nbsp;=&gt;&nbsp;1000&nbsp;bytes
#&nbsp;1kb&nbsp;=&gt;&nbsp;1024&nbsp;bytes
#&nbsp;1m&nbsp;=&gt;&nbsp;1000000&nbsp;bytes
#&nbsp;1mb&nbsp;=&gt;&nbsp;1024*1024&nbsp;bytes
#&nbsp;1g&nbsp;=&gt;&nbsp;1000000000&nbsp;bytes
#&nbsp;1gb&nbsp;=&gt;&nbsp;1024*1024*1024&nbsp;bytes
#
#&nbsp;units&nbsp;are&nbsp;case&nbsp;insensitive&nbsp;so&nbsp;1GB&nbsp;1Gb&nbsp;1gB&nbsp;are&nbsp;all&nbsp;the&nbsp;same.
&nbsp;
#&nbsp;By&nbsp;default&nbsp;Redis&nbsp;does&nbsp;not&nbsp;run&nbsp;as&nbsp;a&nbsp;daemon.&nbsp;Use&nbsp;&#39;yes&#39;&nbsp;if&nbsp;you&nbsp;need&nbsp;it.
#&nbsp;Note&nbsp;that&nbsp;Redis&nbsp;will&nbsp;write&nbsp;a&nbsp;pid&nbsp;file&nbsp;in&nbsp;/var/run/redis.pid&nbsp;when&nbsp;daemonized.
daemonize&nbsp;no&nbsp;&nbsp;
Redis默认不是以守护进程的方式运行，可以通过该配置项修改，使用yes启用守护进程
&nbsp;
#&nbsp;When&nbsp;running&nbsp;daemonized,&nbsp;Redis&nbsp;writes&nbsp;a&nbsp;pid&nbsp;file&nbsp;in&nbsp;/var/run/redis.pid&nbsp;by
#&nbsp;default.&nbsp;You&nbsp;can&nbsp;specify&nbsp;a&nbsp;custom&nbsp;pid&nbsp;file&nbsp;location&nbsp;here.
pidfile&nbsp;/var/run/redis.pid
当Redis以守护进程方式运行时，Redis默认会把pid写入/var/run/redis.pid文件，可以通过pidfile指定
#&nbsp;Accept&nbsp;connections&nbsp;on&nbsp;the&nbsp;specified&nbsp;port,&nbsp;default&nbsp;is&nbsp;6379.
#&nbsp;If&nbsp;port&nbsp;0&nbsp;is&nbsp;specified&nbsp;Redis&nbsp;will&nbsp;not&nbsp;listen&nbsp;on&nbsp;a&nbsp;TCP&nbsp;socket.
port&nbsp;6379
指定Redis监听端口，默认端口为6379
#&nbsp;If&nbsp;you&nbsp;want&nbsp;you&nbsp;can&nbsp;bind&nbsp;a&nbsp;single&nbsp;interface,&nbsp;if&nbsp;the&nbsp;bind&nbsp;option&nbsp;is&nbsp;not
#&nbsp;specified&nbsp;all&nbsp;the&nbsp;interfaces&nbsp;will&nbsp;listen&nbsp;for&nbsp;incoming&nbsp;connections.
#
#&nbsp;bind&nbsp;127.0.0.1
绑定的主机地址
#&nbsp;Specify&nbsp;the&nbsp;path&nbsp;for&nbsp;the&nbsp;unix&nbsp;socket&nbsp;that&nbsp;will&nbsp;be&nbsp;used&nbsp;to&nbsp;listen&nbsp;for
#&nbsp;incoming&nbsp;connections.&nbsp;There&nbsp;is&nbsp;no&nbsp;default,&nbsp;so&nbsp;Redis&nbsp;will&nbsp;not&nbsp;listen
#&nbsp;on&nbsp;a&nbsp;unix&nbsp;socket&nbsp;when&nbsp;not&nbsp;specified.
#
#&nbsp;unixsocket&nbsp;/tmp/redis.sock
#&nbsp;unixsocketperm&nbsp;755
&nbsp;
#&nbsp;Close&nbsp;the&nbsp;connection&nbsp;after&nbsp;a&nbsp;client&nbsp;is&nbsp;idle&nbsp;for&nbsp;N&nbsp;seconds&nbsp;(0&nbsp;to&nbsp;disable)
timeout&nbsp;0
当&nbsp;客户端闲置多长时间后关闭连接，如果指定为0，表示关闭该功能
#&nbsp;Set&nbsp;server&nbsp;verbosity&nbsp;to&nbsp;&#39;debug&#39;
#&nbsp;it&nbsp;can&nbsp;be&nbsp;one&nbsp;of:
#&nbsp;debug&nbsp;(a&nbsp;lot&nbsp;of&nbsp;information,&nbsp;useful&nbsp;for&nbsp;development/testing)
#&nbsp;verbose&nbsp;(many&nbsp;rarely&nbsp;useful&nbsp;info,&nbsp;but&nbsp;not&nbsp;a&nbsp;mess&nbsp;like&nbsp;the&nbsp;debug&nbsp;level)
#&nbsp;notice&nbsp;(moderately&nbsp;verbose,&nbsp;what&nbsp;you&nbsp;want&nbsp;in&nbsp;production&nbsp;probably)
#&nbsp;warning&nbsp;(only&nbsp;very&nbsp;important&nbsp;/&nbsp;critical&nbsp;messages&nbsp;are&nbsp;logged)
loglevel&nbsp;verbose
指定日志记录级别，Redis总共支持四个级别：debug、verbose、notice、warning，默认为verbose
#&nbsp;Specify&nbsp;the&nbsp;log&nbsp;file&nbsp;name.&nbsp;Also&nbsp;&#39;stdout&#39;&nbsp;can&nbsp;be&nbsp;used&nbsp;to&nbsp;force
#&nbsp;Redis&nbsp;to&nbsp;log&nbsp;on&nbsp;the&nbsp;standard&nbsp;output.&nbsp;Note&nbsp;that&nbsp;if&nbsp;you&nbsp;use&nbsp;standard
#&nbsp;output&nbsp;for&nbsp;logging&nbsp;but&nbsp;daemonize,&nbsp;logs&nbsp;will&nbsp;be&nbsp;sent&nbsp;to&nbsp;/dev/null
logfile&nbsp;stdout
日志记录方式，默认为标准输出，如果配置Redis为守护进程方式运行，而这里又配置为日志记录方式为标准输出，则日志将会发送给/dev/null
#&nbsp;To&nbsp;enable&nbsp;logging&nbsp;to&nbsp;the&nbsp;system&nbsp;logger,&nbsp;just&nbsp;set&nbsp;&#39;syslog-enabled&#39;&nbsp;to&nbsp;yes,
#&nbsp;and&nbsp;optionally&nbsp;update&nbsp;the&nbsp;other&nbsp;syslog&nbsp;parameters&nbsp;to&nbsp;suit&nbsp;your&nbsp;needs.
#&nbsp;syslog-enabled&nbsp;no
&nbsp;
#&nbsp;Specify&nbsp;the&nbsp;syslog&nbsp;identity.
#&nbsp;syslog-ident&nbsp;redis
&nbsp;
#&nbsp;Specify&nbsp;the&nbsp;syslog&nbsp;facility.&nbsp;&nbsp;Must&nbsp;be&nbsp;USER&nbsp;or&nbsp;between&nbsp;LOCAL0-LOCAL7.
#&nbsp;syslog-facility&nbsp;local0
&nbsp;
#&nbsp;Set&nbsp;the&nbsp;number&nbsp;of&nbsp;databases.&nbsp;The&nbsp;default&nbsp;database&nbsp;is&nbsp;DB&nbsp;0,&nbsp;you&nbsp;can&nbsp;select
#&nbsp;a&nbsp;different&nbsp;one&nbsp;on&nbsp;a&nbsp;per-connection&nbsp;basis&nbsp;using&nbsp;SELECT&nbsp;&lt;dbid&gt;&nbsp;where
#&nbsp;dbid&nbsp;is&nbsp;a&nbsp;number&nbsp;between&nbsp;0&nbsp;and&nbsp;&#39;databases&#39;-1
databases&nbsp;16
设置数据库的数量，默认数据库为0，可以使用SELECT&nbsp;&lt;dbid&gt;命令在连接上指定数据库id
################################&nbsp;SNAPSHOTTING&nbsp;&nbsp;#################################
#
#&nbsp;Save&nbsp;the&nbsp;DB&nbsp;on&nbsp;disk:
#
#&nbsp;&nbsp;&nbsp;save&nbsp;&lt;seconds&gt;&nbsp;&lt;changes&gt;
#
#&nbsp;&nbsp;&nbsp;Will&nbsp;save&nbsp;the&nbsp;DB&nbsp;if&nbsp;both&nbsp;the&nbsp;given&nbsp;number&nbsp;of&nbsp;seconds&nbsp;and&nbsp;the&nbsp;given
#&nbsp;&nbsp;&nbsp;number&nbsp;of&nbsp;write&nbsp;operations&nbsp;against&nbsp;the&nbsp;DB&nbsp;occurred.
#
#&nbsp;&nbsp;&nbsp;In&nbsp;the&nbsp;example&nbsp;below&nbsp;the&nbsp;behaviour&nbsp;will&nbsp;be&nbsp;to&nbsp;save:
#&nbsp;&nbsp;&nbsp;after&nbsp;900&nbsp;sec&nbsp;(15&nbsp;min)&nbsp;if&nbsp;at&nbsp;least&nbsp;1&nbsp;key&nbsp;changed
#&nbsp;&nbsp;&nbsp;after&nbsp;300&nbsp;sec&nbsp;(5&nbsp;min)&nbsp;if&nbsp;at&nbsp;least&nbsp;10&nbsp;keys&nbsp;changed
#&nbsp;&nbsp;&nbsp;after&nbsp;60&nbsp;sec&nbsp;if&nbsp;at&nbsp;least&nbsp;10000&nbsp;keys&nbsp;changed
#
#&nbsp;&nbsp;&nbsp;Note:&nbsp;you&nbsp;can&nbsp;disable&nbsp;saving&nbsp;at&nbsp;all&nbsp;commenting&nbsp;all&nbsp;the&nbsp;&quot;save&quot;&nbsp;lines.
&nbsp;
save&nbsp;900&nbsp;1
save&nbsp;300&nbsp;10
save&nbsp;60&nbsp;10000
分别表示900秒（15分钟）内有1个更改，300秒（5分钟）内有10个更改以及60秒内有10000个更改。
指定在多长时间内，有多少次更新操作，就将数据同步到数据文件，可以多个条件配合
#&nbsp;Compress&nbsp;string&nbsp;objects&nbsp;using&nbsp;LZF&nbsp;when&nbsp;dump&nbsp;.rdb&nbsp;databases?
#&nbsp;For&nbsp;default&nbsp;that&#39;s&nbsp;set&nbsp;to&nbsp;&#39;yes&#39;&nbsp;as&nbsp;it&#39;s&nbsp;almost&nbsp;always&nbsp;a&nbsp;win.
#&nbsp;If&nbsp;you&nbsp;want&nbsp;to&nbsp;save&nbsp;some&nbsp;CPU&nbsp;in&nbsp;the&nbsp;saving&nbsp;child&nbsp;set&nbsp;it&nbsp;to&nbsp;&#39;no&#39;&nbsp;but
#&nbsp;the&nbsp;dataset&nbsp;will&nbsp;likely&nbsp;be&nbsp;bigger&nbsp;if&nbsp;you&nbsp;have&nbsp;compressible&nbsp;values&nbsp;or&nbsp;keys.
rdbcompression&nbsp;yes
指定存储至本地数据库时是否压缩数据，默认为yes，Redis采用LZF压缩，如果为了节省CPU时间，可以关闭该选项，但会导致数据库文件变的巨大
#&nbsp;The&nbsp;filename&nbsp;where&nbsp;to&nbsp;dump&nbsp;the&nbsp;DB
dbfilename&nbsp;dump.rdb
指定本地数据库文件名，默认值为dump.rdb
#&nbsp;The&nbsp;working&nbsp;directory.
#
#&nbsp;The&nbsp;DB&nbsp;will&nbsp;be&nbsp;written&nbsp;inside&nbsp;this&nbsp;directory,&nbsp;with&nbsp;the&nbsp;filename&nbsp;specified
#&nbsp;above&nbsp;using&nbsp;the&nbsp;&#39;dbfilename&#39;&nbsp;configuration&nbsp;directive.
#&nbsp;
#&nbsp;Also&nbsp;the&nbsp;Append&nbsp;Only&nbsp;File&nbsp;will&nbsp;be&nbsp;created&nbsp;inside&nbsp;this&nbsp;directory.
#&nbsp;
#&nbsp;Note&nbsp;that&nbsp;you&nbsp;must&nbsp;specify&nbsp;a&nbsp;directory&nbsp;here,&nbsp;not&nbsp;a&nbsp;file&nbsp;name.
dir&nbsp;./
指定本地数据库存放目录
#################################&nbsp;REPLICATION&nbsp;#################################
&nbsp;
#&nbsp;Master-Slave&nbsp;replication.&nbsp;Use&nbsp;slaveof&nbsp;to&nbsp;make&nbsp;a&nbsp;Redis&nbsp;instance&nbsp;a&nbsp;copy&nbsp;of
#&nbsp;another&nbsp;Redis&nbsp;server.&nbsp;Note&nbsp;that&nbsp;the&nbsp;configuration&nbsp;is&nbsp;local&nbsp;to&nbsp;the&nbsp;slave
#&nbsp;so&nbsp;for&nbsp;example&nbsp;it&nbsp;is&nbsp;possible&nbsp;to&nbsp;configure&nbsp;the&nbsp;slave&nbsp;to&nbsp;save&nbsp;the&nbsp;DB&nbsp;with&nbsp;a
#&nbsp;different&nbsp;interval,&nbsp;or&nbsp;to&nbsp;listen&nbsp;to&nbsp;another&nbsp;port,&nbsp;and&nbsp;so&nbsp;on.
#
#&nbsp;slaveof&nbsp;&lt;masterip&gt;&nbsp;&lt;masterport&gt;
slaveof&nbsp;&lt;masterip&gt;&nbsp;&lt;masterport&gt;&nbsp;设置当本机为slav服务时，设置master服务的IP地址及端口，在Redis启动时，它会自动从master进行数据同步
#&nbsp;If&nbsp;the&nbsp;master&nbsp;is&nbsp;password&nbsp;protected&nbsp;(using&nbsp;the&nbsp;&quot;requirepass&quot;&nbsp;configuration
#&nbsp;directive&nbsp;below)&nbsp;it&nbsp;is&nbsp;possible&nbsp;to&nbsp;tell&nbsp;the&nbsp;slave&nbsp;to&nbsp;authenticate&nbsp;before
#&nbsp;starting&nbsp;the&nbsp;replication&nbsp;synchronization&nbsp;process,&nbsp;otherwise&nbsp;the&nbsp;master&nbsp;will
#&nbsp;refuse&nbsp;the&nbsp;slave&nbsp;request.
#
#&nbsp;masterauth&nbsp;&lt;master-password&gt;
masterauth&nbsp;&lt;master-password&gt;&nbsp;当master服务设置了密码保护时，slav服务连接master的密码
#&nbsp;When&nbsp;a&nbsp;slave&nbsp;lost&nbsp;the&nbsp;connection&nbsp;with&nbsp;the&nbsp;master,&nbsp;or&nbsp;when&nbsp;the&nbsp;replication
#&nbsp;is&nbsp;still&nbsp;in&nbsp;progress,&nbsp;the&nbsp;slave&nbsp;can&nbsp;act&nbsp;in&nbsp;two&nbsp;different&nbsp;ways:
#
#&nbsp;1)&nbsp;if&nbsp;slave-serve-stale-data&nbsp;is&nbsp;set&nbsp;to&nbsp;&#39;yes&#39;&nbsp;(the&nbsp;default)&nbsp;the&nbsp;slave&nbsp;will
#&nbsp;&nbsp;&nbsp;&nbsp;still&nbsp;reply&nbsp;to&nbsp;client&nbsp;requests,&nbsp;possibly&nbsp;with&nbsp;out&nbsp;of&nbsp;data&nbsp;data,&nbsp;or&nbsp;the
#&nbsp;&nbsp;&nbsp;&nbsp;data&nbsp;set&nbsp;may&nbsp;just&nbsp;be&nbsp;empty&nbsp;if&nbsp;this&nbsp;is&nbsp;the&nbsp;first&nbsp;synchronization.
#
#&nbsp;2)&nbsp;if&nbsp;slave-serve-stale&nbsp;data&nbsp;is&nbsp;set&nbsp;to&nbsp;&#39;no&#39;&nbsp;the&nbsp;slave&nbsp;will&nbsp;reply&nbsp;with
#&nbsp;&nbsp;&nbsp;&nbsp;an&nbsp;error&nbsp;&quot;SYNC&nbsp;with&nbsp;master&nbsp;in&nbsp;progress&quot;&nbsp;to&nbsp;all&nbsp;the&nbsp;kind&nbsp;of&nbsp;commands
#&nbsp;&nbsp;&nbsp;&nbsp;but&nbsp;to&nbsp;INFO&nbsp;and&nbsp;SLAVEOF.
#
slave-serve-stale-data&nbsp;yes
&nbsp;
#&nbsp;Slaves&nbsp;send&nbsp;PINGs&nbsp;to&nbsp;server&nbsp;in&nbsp;a&nbsp;predefined&nbsp;interval.&nbsp;It&#39;s&nbsp;possible&nbsp;to&nbsp;change
#&nbsp;this&nbsp;interval&nbsp;with&nbsp;the&nbsp;repl_ping_slave_period&nbsp;option.&nbsp;The&nbsp;default&nbsp;value&nbsp;is&nbsp;10
#&nbsp;seconds.
#
#&nbsp;repl-ping-slave-period&nbsp;10
&nbsp;
#&nbsp;The&nbsp;following&nbsp;option&nbsp;sets&nbsp;a&nbsp;timeout&nbsp;for&nbsp;both&nbsp;Bulk&nbsp;transfer&nbsp;I/O&nbsp;timeout&nbsp;and
#&nbsp;master&nbsp;data&nbsp;or&nbsp;ping&nbsp;response&nbsp;timeout.&nbsp;The&nbsp;default&nbsp;value&nbsp;is&nbsp;60&nbsp;seconds.
#
#&nbsp;It&nbsp;is&nbsp;important&nbsp;to&nbsp;make&nbsp;sure&nbsp;that&nbsp;this&nbsp;value&nbsp;is&nbsp;greater&nbsp;than&nbsp;the&nbsp;value
#&nbsp;specified&nbsp;for&nbsp;repl-ping-slave-period&nbsp;otherwise&nbsp;a&nbsp;timeout&nbsp;will&nbsp;be&nbsp;detected
#&nbsp;every&nbsp;time&nbsp;there&nbsp;is&nbsp;low&nbsp;traffic&nbsp;between&nbsp;the&nbsp;master&nbsp;and&nbsp;the&nbsp;slave.
#
#&nbsp;repl-timeout&nbsp;60
&nbsp;
##################################&nbsp;SECURITY&nbsp;###################################
&nbsp;
#&nbsp;Require&nbsp;clients&nbsp;to&nbsp;issue&nbsp;AUTH&nbsp;&lt;PASSWORD&gt;&nbsp;before&nbsp;processing&nbsp;any&nbsp;other
#&nbsp;commands.&nbsp;&nbsp;This&nbsp;might&nbsp;be&nbsp;useful&nbsp;in&nbsp;environments&nbsp;in&nbsp;which&nbsp;you&nbsp;do&nbsp;not&nbsp;trust
#&nbsp;others&nbsp;with&nbsp;access&nbsp;to&nbsp;the&nbsp;host&nbsp;running&nbsp;redis-server.
#
#&nbsp;This&nbsp;should&nbsp;stay&nbsp;commented&nbsp;out&nbsp;for&nbsp;backward&nbsp;compatibility&nbsp;and&nbsp;because&nbsp;most
#&nbsp;people&nbsp;do&nbsp;not&nbsp;need&nbsp;auth&nbsp;(e.g.&nbsp;they&nbsp;run&nbsp;their&nbsp;own&nbsp;servers).
#&nbsp;
#&nbsp;Warning:&nbsp;since&nbsp;Redis&nbsp;is&nbsp;pretty&nbsp;fast&nbsp;an&nbsp;outside&nbsp;user&nbsp;can&nbsp;try&nbsp;up&nbsp;to
#&nbsp;150k&nbsp;passwords&nbsp;per&nbsp;second&nbsp;against&nbsp;a&nbsp;good&nbsp;box.&nbsp;This&nbsp;means&nbsp;that&nbsp;you&nbsp;should
#&nbsp;use&nbsp;a&nbsp;very&nbsp;strong&nbsp;password&nbsp;otherwise&nbsp;it&nbsp;will&nbsp;be&nbsp;very&nbsp;easy&nbsp;to&nbsp;break.
#
#&nbsp;requirepass&nbsp;foobared
&nbsp;requirepass&nbsp;foobared&nbsp;设置Redis连接密码，如果配置了连接密码，客户端在连接Redis时需要通过AUTH&nbsp;&lt;password&gt;命令提供密码，默认关闭
#&nbsp;Command&nbsp;renaming.
#
#&nbsp;It&nbsp;is&nbsp;possilbe&nbsp;to&nbsp;change&nbsp;the&nbsp;name&nbsp;of&nbsp;dangerous&nbsp;commands&nbsp;in&nbsp;a&nbsp;shared
#&nbsp;environment.&nbsp;For&nbsp;instance&nbsp;the&nbsp;CONFIG&nbsp;command&nbsp;may&nbsp;be&nbsp;renamed&nbsp;into&nbsp;something
#&nbsp;of&nbsp;hard&nbsp;to&nbsp;guess&nbsp;so&nbsp;that&nbsp;it&nbsp;will&nbsp;be&nbsp;still&nbsp;available&nbsp;for&nbsp;internal-use
#&nbsp;tools&nbsp;but&nbsp;not&nbsp;available&nbsp;for&nbsp;general&nbsp;clients.
#
#&nbsp;Example:
#
#&nbsp;rename-command&nbsp;CONFIG&nbsp;b840fc02d524045429941cc15f59e41cb7be6c52
#
#&nbsp;It&nbsp;is&nbsp;also&nbsp;possilbe&nbsp;to&nbsp;completely&nbsp;kill&nbsp;a&nbsp;command&nbsp;renaming&nbsp;it&nbsp;into
#&nbsp;an&nbsp;empty&nbsp;string:
#
#&nbsp;rename-command&nbsp;CONFIG&nbsp;&quot;&quot;
&nbsp;
###################################&nbsp;LIMITS&nbsp;####################################
&nbsp;
#&nbsp;Set&nbsp;the&nbsp;max&nbsp;number&nbsp;of&nbsp;connected&nbsp;clients&nbsp;at&nbsp;the&nbsp;same&nbsp;time.&nbsp;By&nbsp;default&nbsp;there
#&nbsp;is&nbsp;no&nbsp;limit,&nbsp;and&nbsp;it&#39;s&nbsp;up&nbsp;to&nbsp;the&nbsp;number&nbsp;of&nbsp;file&nbsp;descriptors&nbsp;the&nbsp;Redis&nbsp;process
#&nbsp;is&nbsp;able&nbsp;to&nbsp;open.&nbsp;The&nbsp;special&nbsp;value&nbsp;&#39;0&#39;&nbsp;means&nbsp;no&nbsp;limits.
#&nbsp;Once&nbsp;the&nbsp;limit&nbsp;is&nbsp;reached&nbsp;Redis&nbsp;will&nbsp;close&nbsp;all&nbsp;the&nbsp;new&nbsp;connections&nbsp;sending
#&nbsp;an&nbsp;error&nbsp;&#39;max&nbsp;number&nbsp;of&nbsp;clients&nbsp;reached&#39;.
#
#&nbsp;maxclients&nbsp;128
maxclients&nbsp;128&nbsp;设置同一时间最大客户端连接数，默认无限制，Redis可以同时打开的客户端连接数为Redis进程可以打开的最大文件描述符数，如果设置&nbsp;maxclients&nbsp;0，表示不作限制。当客户端连接数到达限制时，Redis会关闭新的连接并向客户端返回max&nbsp;number&nbsp;of&nbsp;clients&nbsp;reached错误信息
#&nbsp;Don&#39;t&nbsp;use&nbsp;more&nbsp;memory&nbsp;than&nbsp;the&nbsp;specified&nbsp;amount&nbsp;of&nbsp;bytes.
#&nbsp;When&nbsp;the&nbsp;memory&nbsp;limit&nbsp;is&nbsp;reached&nbsp;Redis&nbsp;will&nbsp;try&nbsp;to&nbsp;remove&nbsp;keys&nbsp;with&nbsp;an
#&nbsp;EXPIRE&nbsp;set.&nbsp;It&nbsp;will&nbsp;try&nbsp;to&nbsp;start&nbsp;freeing&nbsp;keys&nbsp;that&nbsp;are&nbsp;going&nbsp;to&nbsp;expire
#&nbsp;in&nbsp;little&nbsp;time&nbsp;and&nbsp;preserve&nbsp;keys&nbsp;with&nbsp;a&nbsp;longer&nbsp;time&nbsp;to&nbsp;live.
#&nbsp;Redis&nbsp;will&nbsp;also&nbsp;try&nbsp;to&nbsp;remove&nbsp;objects&nbsp;from&nbsp;free&nbsp;lists&nbsp;if&nbsp;possible.
#
#&nbsp;If&nbsp;all&nbsp;this&nbsp;fails,&nbsp;Redis&nbsp;will&nbsp;start&nbsp;to&nbsp;reply&nbsp;with&nbsp;errors&nbsp;to&nbsp;commands
#&nbsp;that&nbsp;will&nbsp;use&nbsp;more&nbsp;memory,&nbsp;like&nbsp;SET,&nbsp;LPUSH,&nbsp;and&nbsp;so&nbsp;on,&nbsp;and&nbsp;will&nbsp;continue
#&nbsp;to&nbsp;reply&nbsp;to&nbsp;most&nbsp;read-only&nbsp;commands&nbsp;like&nbsp;GET.
#
#&nbsp;WARNING:&nbsp;maxmemory&nbsp;can&nbsp;be&nbsp;a&nbsp;good&nbsp;idea&nbsp;mainly&nbsp;if&nbsp;you&nbsp;want&nbsp;to&nbsp;use&nbsp;Redis&nbsp;as&nbsp;a
#&nbsp;&#39;state&#39;&nbsp;server&nbsp;or&nbsp;cache,&nbsp;not&nbsp;as&nbsp;a&nbsp;real&nbsp;DB.&nbsp;When&nbsp;Redis&nbsp;is&nbsp;used&nbsp;as&nbsp;a&nbsp;real
#&nbsp;database&nbsp;the&nbsp;memory&nbsp;usage&nbsp;will&nbsp;grow&nbsp;over&nbsp;the&nbsp;weeks,&nbsp;it&nbsp;will&nbsp;be&nbsp;obvious&nbsp;if
#&nbsp;it&nbsp;is&nbsp;going&nbsp;to&nbsp;use&nbsp;too&nbsp;much&nbsp;memory&nbsp;in&nbsp;the&nbsp;long&nbsp;run,&nbsp;and&nbsp;you&#39;ll&nbsp;have&nbsp;the&nbsp;time
#&nbsp;to&nbsp;upgrade.&nbsp;With&nbsp;maxmemory&nbsp;after&nbsp;the&nbsp;limit&nbsp;is&nbsp;reached&nbsp;you&#39;ll&nbsp;start&nbsp;to&nbsp;get
#&nbsp;errors&nbsp;for&nbsp;write&nbsp;operations,&nbsp;and&nbsp;this&nbsp;may&nbsp;even&nbsp;lead&nbsp;to&nbsp;DB&nbsp;inconsistency.
#
#&nbsp;maxmemory&nbsp;&lt;bytes&gt;
&nbsp;maxmemory&nbsp;&lt;bytes&gt;指定Redis最大内存限制，Redis在启动时会把数据加载到内存中，达到最大内存后，Redis会先尝试清除已到期或即将到期的Key，当此方法处理&nbsp;后，仍然到达最大内存设置，将无法再进行写入操作，但仍然可以进行读取操作。Redis新的vm机制，会把Key存放内存，Value会存放在swap区
#&nbsp;MAXMEMORY&nbsp;POLICY:&nbsp;how&nbsp;Redis&nbsp;will&nbsp;select&nbsp;what&nbsp;to&nbsp;remove&nbsp;when&nbsp;maxmemory
#&nbsp;is&nbsp;reached?&nbsp;You&nbsp;can&nbsp;select&nbsp;among&nbsp;five&nbsp;behavior:
#&nbsp;
#&nbsp;volatile-lru&nbsp;-&gt;&nbsp;remove&nbsp;the&nbsp;key&nbsp;with&nbsp;an&nbsp;expire&nbsp;set&nbsp;using&nbsp;an&nbsp;LRU&nbsp;algorithm
#&nbsp;allkeys-lru&nbsp;-&gt;&nbsp;remove&nbsp;any&nbsp;key&nbsp;accordingly&nbsp;to&nbsp;the&nbsp;LRU&nbsp;algorithm
#&nbsp;volatile-random&nbsp;-&gt;&nbsp;remove&nbsp;a&nbsp;random&nbsp;key&nbsp;with&nbsp;an&nbsp;expire&nbsp;set
#&nbsp;allkeys-&gt;random&nbsp;-&gt;&nbsp;remove&nbsp;a&nbsp;random&nbsp;key,&nbsp;any&nbsp;key
#&nbsp;volatile-ttl&nbsp;-&gt;&nbsp;remove&nbsp;the&nbsp;key&nbsp;with&nbsp;the&nbsp;nearest&nbsp;expire&nbsp;time&nbsp;(minor&nbsp;TTL)
#&nbsp;noeviction&nbsp;-&gt;&nbsp;don&#39;t&nbsp;expire&nbsp;at&nbsp;all,&nbsp;just&nbsp;return&nbsp;an&nbsp;error&nbsp;on&nbsp;write&nbsp;operations
#&nbsp;
#&nbsp;Note:&nbsp;with&nbsp;all&nbsp;the&nbsp;kind&nbsp;of&nbsp;policies,&nbsp;Redis&nbsp;will&nbsp;return&nbsp;an&nbsp;error&nbsp;on&nbsp;write
#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;operations,&nbsp;when&nbsp;there&nbsp;are&nbsp;not&nbsp;suitable&nbsp;keys&nbsp;for&nbsp;eviction.
#
#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;At&nbsp;the&nbsp;date&nbsp;of&nbsp;writing&nbsp;this&nbsp;commands&nbsp;are:&nbsp;set&nbsp;setnx&nbsp;setex&nbsp;append
#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;incr&nbsp;decr&nbsp;rpush&nbsp;lpush&nbsp;rpushx&nbsp;lpushx&nbsp;linsert&nbsp;lset&nbsp;rpoplpush&nbsp;sadd
#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sinter&nbsp;sinterstore&nbsp;sunion&nbsp;sunionstore&nbsp;sdiff&nbsp;sdiffstore&nbsp;zadd&nbsp;zincrby
#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;zunionstore&nbsp;zinterstore&nbsp;hset&nbsp;hsetnx&nbsp;hmset&nbsp;hincrby&nbsp;incrby&nbsp;decrby
#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;getset&nbsp;mset&nbsp;msetnx&nbsp;exec&nbsp;sort
#
#&nbsp;The&nbsp;default&nbsp;is:
#
#&nbsp;maxmemory-policy&nbsp;volatile-lru
&nbsp;
#&nbsp;LRU&nbsp;and&nbsp;minimal&nbsp;TTL&nbsp;algorithms&nbsp;are&nbsp;not&nbsp;precise&nbsp;algorithms&nbsp;but&nbsp;approximated
#&nbsp;algorithms&nbsp;(in&nbsp;order&nbsp;to&nbsp;save&nbsp;memory),&nbsp;so&nbsp;you&nbsp;can&nbsp;select&nbsp;as&nbsp;well&nbsp;the&nbsp;sample
#&nbsp;size&nbsp;to&nbsp;check.&nbsp;For&nbsp;instance&nbsp;for&nbsp;default&nbsp;Redis&nbsp;will&nbsp;check&nbsp;three&nbsp;keys&nbsp;and
#&nbsp;pick&nbsp;the&nbsp;one&nbsp;that&nbsp;was&nbsp;used&nbsp;less&nbsp;recently,&nbsp;you&nbsp;can&nbsp;change&nbsp;the&nbsp;sample&nbsp;size
#&nbsp;using&nbsp;the&nbsp;following&nbsp;configuration&nbsp;directive.
#
#&nbsp;maxmemory-samples&nbsp;3
&nbsp;
##############################&nbsp;APPEND&nbsp;ONLY&nbsp;MODE&nbsp;###############################
&nbsp;
#&nbsp;By&nbsp;default&nbsp;Redis&nbsp;asynchronously&nbsp;dumps&nbsp;the&nbsp;dataset&nbsp;on&nbsp;disk.&nbsp;If&nbsp;you&nbsp;can&nbsp;live
#&nbsp;with&nbsp;the&nbsp;idea&nbsp;that&nbsp;the&nbsp;latest&nbsp;records&nbsp;will&nbsp;be&nbsp;lost&nbsp;if&nbsp;something&nbsp;like&nbsp;a&nbsp;crash
#&nbsp;happens&nbsp;this&nbsp;is&nbsp;the&nbsp;preferred&nbsp;way&nbsp;to&nbsp;run&nbsp;Redis.&nbsp;If&nbsp;instead&nbsp;you&nbsp;care&nbsp;a&nbsp;lot
#&nbsp;about&nbsp;your&nbsp;data&nbsp;and&nbsp;don&#39;t&nbsp;want&nbsp;to&nbsp;that&nbsp;a&nbsp;single&nbsp;record&nbsp;can&nbsp;get&nbsp;lost&nbsp;you&nbsp;should
#&nbsp;enable&nbsp;the&nbsp;append&nbsp;only&nbsp;mode:&nbsp;when&nbsp;this&nbsp;mode&nbsp;is&nbsp;enabled&nbsp;Redis&nbsp;will&nbsp;append
#&nbsp;every&nbsp;write&nbsp;operation&nbsp;received&nbsp;in&nbsp;the&nbsp;file&nbsp;appendonly.aof.&nbsp;This&nbsp;file&nbsp;will
#&nbsp;be&nbsp;read&nbsp;on&nbsp;startup&nbsp;in&nbsp;order&nbsp;to&nbsp;rebuild&nbsp;the&nbsp;full&nbsp;dataset&nbsp;in&nbsp;memory.
#
#&nbsp;Note&nbsp;that&nbsp;you&nbsp;can&nbsp;have&nbsp;both&nbsp;the&nbsp;async&nbsp;dumps&nbsp;and&nbsp;the&nbsp;append&nbsp;only&nbsp;file&nbsp;if&nbsp;you
#&nbsp;like&nbsp;(you&nbsp;have&nbsp;to&nbsp;comment&nbsp;the&nbsp;&quot;save&quot;&nbsp;statements&nbsp;above&nbsp;to&nbsp;disable&nbsp;the&nbsp;dumps).
#&nbsp;Still&nbsp;if&nbsp;append&nbsp;only&nbsp;mode&nbsp;is&nbsp;enabled&nbsp;Redis&nbsp;will&nbsp;load&nbsp;the&nbsp;data&nbsp;from&nbsp;the
#&nbsp;log&nbsp;file&nbsp;at&nbsp;startup&nbsp;ignoring&nbsp;the&nbsp;dump.rdb&nbsp;file.
#
#&nbsp;IMPORTANT:&nbsp;Check&nbsp;the&nbsp;BGREWRITEAOF&nbsp;to&nbsp;check&nbsp;how&nbsp;to&nbsp;rewrite&nbsp;the&nbsp;append
#&nbsp;log&nbsp;file&nbsp;in&nbsp;background&nbsp;when&nbsp;it&nbsp;gets&nbsp;too&nbsp;big.
&nbsp;
appendonly&nbsp;no
appendonly&nbsp;no指定是否在每次更新操作后进行日志记录，Redis在默认情况下是异步的把数据写入磁盘，如果不开启，可能会在断电时导致一段时间内的数据丢失。因为&nbsp;redis本身同步数据文件是按上面save条件来同步的，所以有的数据会在一段时间内只存在于内存中。默认为no
#&nbsp;The&nbsp;name&nbsp;of&nbsp;the&nbsp;append&nbsp;only&nbsp;file&nbsp;(default:&nbsp;&quot;appendonly.aof&quot;)
#&nbsp;appendfilename&nbsp;appendonly.aof
&nbsp;appendfilename&nbsp;appendonly.aof指定更新日志文件名，默认为appendonly.aof
#&nbsp;The&nbsp;fsync()&nbsp;call&nbsp;tells&nbsp;the&nbsp;Operating&nbsp;System&nbsp;to&nbsp;actually&nbsp;write&nbsp;data&nbsp;on&nbsp;disk
#&nbsp;instead&nbsp;to&nbsp;wait&nbsp;for&nbsp;more&nbsp;data&nbsp;in&nbsp;the&nbsp;output&nbsp;buffer.&nbsp;Some&nbsp;OS&nbsp;will&nbsp;really&nbsp;flush&nbsp;
#&nbsp;data&nbsp;on&nbsp;disk,&nbsp;some&nbsp;other&nbsp;OS&nbsp;will&nbsp;just&nbsp;try&nbsp;to&nbsp;do&nbsp;it&nbsp;ASAP.
#
#&nbsp;Redis&nbsp;supports&nbsp;three&nbsp;different&nbsp;modes:
#
#&nbsp;no:&nbsp;don&#39;t&nbsp;fsync,&nbsp;just&nbsp;let&nbsp;the&nbsp;OS&nbsp;flush&nbsp;the&nbsp;data&nbsp;when&nbsp;it&nbsp;wants.&nbsp;Faster.
#&nbsp;always:&nbsp;fsync&nbsp;after&nbsp;every&nbsp;write&nbsp;to&nbsp;the&nbsp;append&nbsp;only&nbsp;log&nbsp;.&nbsp;Slow,&nbsp;Safest.
#&nbsp;everysec:&nbsp;fsync&nbsp;only&nbsp;if&nbsp;one&nbsp;second&nbsp;passed&nbsp;since&nbsp;the&nbsp;last&nbsp;fsync.&nbsp;Compromise.
#
#&nbsp;The&nbsp;default&nbsp;is&nbsp;&quot;everysec&quot;&nbsp;that&#39;s&nbsp;usually&nbsp;the&nbsp;right&nbsp;compromise&nbsp;between
#&nbsp;speed&nbsp;and&nbsp;data&nbsp;safety.&nbsp;It&#39;s&nbsp;up&nbsp;to&nbsp;you&nbsp;to&nbsp;understand&nbsp;if&nbsp;you&nbsp;can&nbsp;relax&nbsp;this&nbsp;to
#&nbsp;&quot;no&quot;&nbsp;that&nbsp;will&nbsp;will&nbsp;let&nbsp;the&nbsp;operating&nbsp;system&nbsp;flush&nbsp;the&nbsp;output&nbsp;buffer&nbsp;when
#&nbsp;it&nbsp;wants,&nbsp;for&nbsp;better&nbsp;performances&nbsp;(but&nbsp;if&nbsp;you&nbsp;can&nbsp;live&nbsp;with&nbsp;the&nbsp;idea&nbsp;of
#&nbsp;some&nbsp;data&nbsp;loss&nbsp;consider&nbsp;the&nbsp;default&nbsp;persistence&nbsp;mode&nbsp;that&#39;s&nbsp;snapshotting),
#&nbsp;or&nbsp;on&nbsp;the&nbsp;contrary,&nbsp;use&nbsp;&quot;always&quot;&nbsp;that&#39;s&nbsp;very&nbsp;slow&nbsp;but&nbsp;a&nbsp;bit&nbsp;safer&nbsp;than
#&nbsp;everysec.
#
#&nbsp;If&nbsp;unsure,&nbsp;use&nbsp;&quot;everysec&quot;.
&nbsp;
#&nbsp;appendfsync&nbsp;always
appendfsync&nbsp;everysec
#&nbsp;appendfsync&nbsp;no
指定更新日志条件，共有3个可选值：
no：表示等操作系统进行数据缓存同步到磁盘（快）
always：表示每次更新操作后手动调用fsync()将数据写到磁盘（慢，安全）
everysec：表示每秒同步一次（折衷，默认值）
#&nbsp;When&nbsp;the&nbsp;AOF&nbsp;fsync&nbsp;policy&nbsp;is&nbsp;set&nbsp;to&nbsp;always&nbsp;or&nbsp;everysec,&nbsp;and&nbsp;a&nbsp;background
#&nbsp;saving&nbsp;process&nbsp;(a&nbsp;background&nbsp;save&nbsp;or&nbsp;AOF&nbsp;log&nbsp;background&nbsp;rewriting)&nbsp;is
#&nbsp;performing&nbsp;a&nbsp;lot&nbsp;of&nbsp;I/O&nbsp;against&nbsp;the&nbsp;disk,&nbsp;in&nbsp;some&nbsp;Linux&nbsp;configurations
#&nbsp;Redis&nbsp;may&nbsp;block&nbsp;too&nbsp;long&nbsp;on&nbsp;the&nbsp;fsync()&nbsp;call.&nbsp;Note&nbsp;that&nbsp;there&nbsp;is&nbsp;no&nbsp;fix&nbsp;for
#&nbsp;this&nbsp;currently,&nbsp;as&nbsp;even&nbsp;performing&nbsp;fsync&nbsp;in&nbsp;a&nbsp;different&nbsp;thread&nbsp;will&nbsp;block
#&nbsp;our&nbsp;synchronous&nbsp;write(2)&nbsp;call.
#
#&nbsp;In&nbsp;order&nbsp;to&nbsp;mitigate&nbsp;this&nbsp;problem&nbsp;it&#39;s&nbsp;possible&nbsp;to&nbsp;use&nbsp;the&nbsp;following&nbsp;option
#&nbsp;that&nbsp;will&nbsp;prevent&nbsp;fsync()&nbsp;from&nbsp;being&nbsp;called&nbsp;in&nbsp;the&nbsp;main&nbsp;process&nbsp;while&nbsp;a
#&nbsp;BGSAVE&nbsp;or&nbsp;BGREWRITEAOF&nbsp;is&nbsp;in&nbsp;progress.
#
#&nbsp;This&nbsp;means&nbsp;that&nbsp;while&nbsp;another&nbsp;child&nbsp;is&nbsp;saving&nbsp;the&nbsp;durability&nbsp;of&nbsp;Redis&nbsp;is
#&nbsp;the&nbsp;same&nbsp;as&nbsp;&quot;appendfsync&nbsp;none&quot;,&nbsp;that&nbsp;in&nbsp;pratical&nbsp;terms&nbsp;means&nbsp;that&nbsp;it&nbsp;is
#&nbsp;possible&nbsp;to&nbsp;lost&nbsp;up&nbsp;to&nbsp;30&nbsp;seconds&nbsp;of&nbsp;log&nbsp;in&nbsp;the&nbsp;worst&nbsp;scenario&nbsp;(with&nbsp;the
#&nbsp;default&nbsp;Linux&nbsp;settings).
#&nbsp;
#&nbsp;If&nbsp;you&nbsp;have&nbsp;latency&nbsp;problems&nbsp;turn&nbsp;this&nbsp;to&nbsp;&quot;yes&quot;.&nbsp;Otherwise&nbsp;leave&nbsp;it&nbsp;as
#&nbsp;&quot;no&quot;&nbsp;that&nbsp;is&nbsp;the&nbsp;safest&nbsp;pick&nbsp;from&nbsp;the&nbsp;point&nbsp;of&nbsp;view&nbsp;of&nbsp;durability.
no-appendfsync-on-rewrite&nbsp;no
&nbsp;
#&nbsp;Automatic&nbsp;rewrite&nbsp;of&nbsp;the&nbsp;append&nbsp;only&nbsp;file.
#&nbsp;Redis&nbsp;is&nbsp;able&nbsp;to&nbsp;automatically&nbsp;rewrite&nbsp;the&nbsp;log&nbsp;file&nbsp;implicitly&nbsp;calling
#&nbsp;BGREWRITEAOF&nbsp;when&nbsp;the&nbsp;AOF&nbsp;log&nbsp;size&nbsp;will&nbsp;growth&nbsp;by&nbsp;the&nbsp;specified&nbsp;percentage.
#&nbsp;
#&nbsp;This&nbsp;is&nbsp;how&nbsp;it&nbsp;works:&nbsp;Redis&nbsp;remembers&nbsp;the&nbsp;size&nbsp;of&nbsp;the&nbsp;AOF&nbsp;file&nbsp;after&nbsp;the
#&nbsp;latest&nbsp;rewrite&nbsp;(or&nbsp;if&nbsp;no&nbsp;rewrite&nbsp;happened&nbsp;since&nbsp;the&nbsp;restart,&nbsp;the&nbsp;size&nbsp;of
#&nbsp;the&nbsp;AOF&nbsp;at&nbsp;startup&nbsp;is&nbsp;used).
#
#&nbsp;This&nbsp;base&nbsp;size&nbsp;is&nbsp;compared&nbsp;to&nbsp;the&nbsp;current&nbsp;size.&nbsp;If&nbsp;the&nbsp;current&nbsp;size&nbsp;is
#&nbsp;bigger&nbsp;than&nbsp;the&nbsp;specified&nbsp;percentage,&nbsp;the&nbsp;rewrite&nbsp;is&nbsp;triggered.&nbsp;Also
#&nbsp;you&nbsp;need&nbsp;to&nbsp;specify&nbsp;a&nbsp;minimal&nbsp;size&nbsp;for&nbsp;the&nbsp;AOF&nbsp;file&nbsp;to&nbsp;be&nbsp;rewritten,&nbsp;this
#&nbsp;is&nbsp;useful&nbsp;to&nbsp;avoid&nbsp;rewriting&nbsp;the&nbsp;AOF&nbsp;file&nbsp;even&nbsp;if&nbsp;the&nbsp;percentage&nbsp;increase
#&nbsp;is&nbsp;reached&nbsp;but&nbsp;it&nbsp;is&nbsp;still&nbsp;pretty&nbsp;small.
#
#&nbsp;Specify&nbsp;a&nbsp;precentage&nbsp;of&nbsp;zero&nbsp;in&nbsp;order&nbsp;to&nbsp;disable&nbsp;the&nbsp;automatic&nbsp;AOF
#&nbsp;rewrite&nbsp;feature.
&nbsp;
auto-aof-rewrite-percentage&nbsp;100
auto-aof-rewrite-min-size&nbsp;64mb
&nbsp;
##################################&nbsp;SLOW&nbsp;LOG&nbsp;###################################
&nbsp;
#&nbsp;The&nbsp;Redis&nbsp;Slow&nbsp;Log&nbsp;is&nbsp;a&nbsp;system&nbsp;to&nbsp;log&nbsp;queries&nbsp;that&nbsp;exceeded&nbsp;a&nbsp;specified
#&nbsp;execution&nbsp;time.&nbsp;The&nbsp;execution&nbsp;time&nbsp;does&nbsp;not&nbsp;include&nbsp;the&nbsp;I/O&nbsp;operations
#&nbsp;like&nbsp;talking&nbsp;with&nbsp;the&nbsp;client,&nbsp;sending&nbsp;the&nbsp;reply&nbsp;and&nbsp;so&nbsp;forth,
#&nbsp;but&nbsp;just&nbsp;the&nbsp;time&nbsp;needed&nbsp;to&nbsp;actually&nbsp;execute&nbsp;the&nbsp;command&nbsp;(this&nbsp;is&nbsp;the&nbsp;only
#&nbsp;stage&nbsp;of&nbsp;command&nbsp;execution&nbsp;where&nbsp;the&nbsp;thread&nbsp;is&nbsp;blocked&nbsp;and&nbsp;can&nbsp;not&nbsp;serve
#&nbsp;other&nbsp;requests&nbsp;in&nbsp;the&nbsp;meantime).
#&nbsp;
#&nbsp;You&nbsp;can&nbsp;configure&nbsp;the&nbsp;slow&nbsp;log&nbsp;with&nbsp;two&nbsp;parameters:&nbsp;one&nbsp;tells&nbsp;Redis
#&nbsp;what&nbsp;is&nbsp;the&nbsp;execution&nbsp;time,&nbsp;in&nbsp;microseconds,&nbsp;to&nbsp;exceed&nbsp;in&nbsp;order&nbsp;for&nbsp;the
#&nbsp;command&nbsp;to&nbsp;get&nbsp;logged,&nbsp;and&nbsp;the&nbsp;other&nbsp;parameter&nbsp;is&nbsp;the&nbsp;length&nbsp;of&nbsp;the
#&nbsp;slow&nbsp;log.&nbsp;When&nbsp;a&nbsp;new&nbsp;command&nbsp;is&nbsp;logged&nbsp;the&nbsp;oldest&nbsp;one&nbsp;is&nbsp;removed&nbsp;from&nbsp;the
#&nbsp;queue&nbsp;of&nbsp;logged&nbsp;commands.
&nbsp;
#&nbsp;The&nbsp;following&nbsp;time&nbsp;is&nbsp;expressed&nbsp;in&nbsp;microseconds,&nbsp;so&nbsp;1000000&nbsp;is&nbsp;equivalent
#&nbsp;to&nbsp;one&nbsp;second.&nbsp;Note&nbsp;that&nbsp;a&nbsp;negative&nbsp;number&nbsp;disables&nbsp;the&nbsp;slow&nbsp;log,&nbsp;while
#&nbsp;a&nbsp;value&nbsp;of&nbsp;zero&nbsp;forces&nbsp;the&nbsp;logging&nbsp;of&nbsp;every&nbsp;command.
slowlog-log-slower-than&nbsp;10000
&nbsp;
#&nbsp;There&nbsp;is&nbsp;no&nbsp;limit&nbsp;to&nbsp;this&nbsp;length.&nbsp;Just&nbsp;be&nbsp;aware&nbsp;that&nbsp;it&nbsp;will&nbsp;consume&nbsp;memory.
#&nbsp;You&nbsp;can&nbsp;reclaim&nbsp;memory&nbsp;used&nbsp;by&nbsp;the&nbsp;slow&nbsp;log&nbsp;with&nbsp;SLOWLOG&nbsp;RESET.
slowlog-max-len&nbsp;1024
&nbsp;
################################&nbsp;VIRTUAL&nbsp;MEMORY&nbsp;###############################
&nbsp;
###&nbsp;WARNING!&nbsp;Virtual&nbsp;Memory&nbsp;is&nbsp;deprecated&nbsp;in&nbsp;Redis&nbsp;2.4
###&nbsp;The&nbsp;use&nbsp;of&nbsp;Virtual&nbsp;Memory&nbsp;is&nbsp;strongly&nbsp;discouraged.
&nbsp;
###&nbsp;WARNING!&nbsp;Virtual&nbsp;Memory&nbsp;is&nbsp;deprecated&nbsp;in&nbsp;Redis&nbsp;2.4
###&nbsp;The&nbsp;use&nbsp;of&nbsp;Virtual&nbsp;Memory&nbsp;is&nbsp;strongly&nbsp;discouraged.
&nbsp;
#&nbsp;Virtual&nbsp;Memory&nbsp;allows&nbsp;Redis&nbsp;to&nbsp;work&nbsp;with&nbsp;datasets&nbsp;bigger&nbsp;than&nbsp;the&nbsp;actual
#&nbsp;amount&nbsp;of&nbsp;RAM&nbsp;needed&nbsp;to&nbsp;hold&nbsp;the&nbsp;whole&nbsp;dataset&nbsp;in&nbsp;memory.
#&nbsp;In&nbsp;order&nbsp;to&nbsp;do&nbsp;so&nbsp;very&nbsp;used&nbsp;keys&nbsp;are&nbsp;taken&nbsp;in&nbsp;memory&nbsp;while&nbsp;the&nbsp;other&nbsp;keys
#&nbsp;are&nbsp;swapped&nbsp;into&nbsp;a&nbsp;swap&nbsp;file,&nbsp;similarly&nbsp;to&nbsp;what&nbsp;operating&nbsp;systems&nbsp;do
#&nbsp;with&nbsp;memory&nbsp;pages.
#
#&nbsp;To&nbsp;enable&nbsp;VM&nbsp;just&nbsp;set&nbsp;&#39;vm-enabled&#39;&nbsp;to&nbsp;yes,&nbsp;and&nbsp;set&nbsp;the&nbsp;following&nbsp;three
#&nbsp;VM&nbsp;parameters&nbsp;accordingly&nbsp;to&nbsp;your&nbsp;needs.
&nbsp;
vm-enabled&nbsp;no
指定是否启用虚拟内存机制，默认值为no，简单的介绍一下，VM机制将数据分页存放，由Redis将访问量较少的页即冷数据swap到磁盘上，访问多的页面由磁盘自动换出到内存中（在后面的文章我会仔细分析Redis的VM机制）
#&nbsp;vm-enabled&nbsp;yes
&nbsp;
#&nbsp;This&nbsp;is&nbsp;the&nbsp;path&nbsp;of&nbsp;the&nbsp;Redis&nbsp;swap&nbsp;file.&nbsp;As&nbsp;you&nbsp;can&nbsp;guess,&nbsp;swap&nbsp;files
#&nbsp;can&#39;t&nbsp;be&nbsp;shared&nbsp;by&nbsp;different&nbsp;Redis&nbsp;instances,&nbsp;so&nbsp;make&nbsp;sure&nbsp;to&nbsp;use&nbsp;a&nbsp;swap
#&nbsp;file&nbsp;for&nbsp;every&nbsp;redis&nbsp;process&nbsp;you&nbsp;are&nbsp;running.&nbsp;Redis&nbsp;will&nbsp;complain&nbsp;if&nbsp;the
#&nbsp;swap&nbsp;file&nbsp;is&nbsp;already&nbsp;in&nbsp;use.
#
#&nbsp;The&nbsp;best&nbsp;kind&nbsp;of&nbsp;storage&nbsp;for&nbsp;the&nbsp;Redis&nbsp;swap&nbsp;file&nbsp;(that&#39;s&nbsp;accessed&nbsp;at&nbsp;random)&nbsp;
#&nbsp;is&nbsp;a&nbsp;Solid&nbsp;State&nbsp;Disk&nbsp;(SSD).
#
#&nbsp;***&nbsp;WARNING&nbsp;***&nbsp;if&nbsp;you&nbsp;are&nbsp;using&nbsp;a&nbsp;shared&nbsp;hosting&nbsp;the&nbsp;default&nbsp;of&nbsp;putting
#&nbsp;the&nbsp;swap&nbsp;file&nbsp;under&nbsp;/tmp&nbsp;is&nbsp;not&nbsp;secure.&nbsp;Create&nbsp;a&nbsp;dir&nbsp;with&nbsp;access&nbsp;granted
#&nbsp;only&nbsp;to&nbsp;Redis&nbsp;user&nbsp;and&nbsp;configure&nbsp;Redis&nbsp;to&nbsp;create&nbsp;the&nbsp;swap&nbsp;file&nbsp;there.
vm-swap-file&nbsp;/tmp/redis.swap
虚拟内存文件路径，默认值为/tmp/redis.swap，不可多个Redis实例共享
#&nbsp;vm-max-memory&nbsp;configures&nbsp;the&nbsp;VM&nbsp;to&nbsp;use&nbsp;at&nbsp;max&nbsp;the&nbsp;specified&nbsp;amount&nbsp;of
#&nbsp;RAM.&nbsp;Everything&nbsp;that&nbsp;deos&nbsp;not&nbsp;fit&nbsp;will&nbsp;be&nbsp;swapped&nbsp;on&nbsp;disk&nbsp;*if*&nbsp;possible,&nbsp;that
#&nbsp;is,&nbsp;if&nbsp;there&nbsp;is&nbsp;still&nbsp;enough&nbsp;contiguous&nbsp;space&nbsp;in&nbsp;the&nbsp;swap&nbsp;file.
#
#&nbsp;With&nbsp;vm-max-memory&nbsp;0&nbsp;the&nbsp;system&nbsp;will&nbsp;swap&nbsp;everything&nbsp;it&nbsp;can.&nbsp;Not&nbsp;a&nbsp;good
#&nbsp;default,&nbsp;just&nbsp;specify&nbsp;the&nbsp;max&nbsp;amount&nbsp;of&nbsp;RAM&nbsp;you&nbsp;can&nbsp;in&nbsp;bytes,&nbsp;but&nbsp;it&#39;s
#&nbsp;better&nbsp;to&nbsp;leave&nbsp;some&nbsp;margin.&nbsp;For&nbsp;instance&nbsp;specify&nbsp;an&nbsp;amount&nbsp;of&nbsp;RAM
#&nbsp;that&#39;s&nbsp;more&nbsp;or&nbsp;less&nbsp;between&nbsp;60&nbsp;and&nbsp;80%&nbsp;of&nbsp;your&nbsp;free&nbsp;RAM.
vm-max-memory&nbsp;0
将所有大于vm-max-memory的数据存入虚拟内存,无论vm-max-memory设置多小,所有索引数据都是内存存储的(Redis的索引数据&nbsp;就是keys),也就是说,当vm-max-memory设置为0的时候,其实是所有value都存在于磁盘。默认值为0
#&nbsp;Redis&nbsp;swap&nbsp;files&nbsp;is&nbsp;split&nbsp;into&nbsp;pages.&nbsp;An&nbsp;object&nbsp;can&nbsp;be&nbsp;saved&nbsp;using&nbsp;multiple
#&nbsp;contiguous&nbsp;pages,&nbsp;but&nbsp;pages&nbsp;can&#39;t&nbsp;be&nbsp;shared&nbsp;between&nbsp;different&nbsp;objects.
#&nbsp;So&nbsp;if&nbsp;your&nbsp;page&nbsp;is&nbsp;too&nbsp;big,&nbsp;small&nbsp;objects&nbsp;swapped&nbsp;out&nbsp;on&nbsp;disk&nbsp;will&nbsp;waste
#&nbsp;a&nbsp;lot&nbsp;of&nbsp;space.&nbsp;If&nbsp;you&nbsp;page&nbsp;is&nbsp;too&nbsp;small,&nbsp;there&nbsp;is&nbsp;less&nbsp;space&nbsp;in&nbsp;the&nbsp;swap
#&nbsp;file&nbsp;(assuming&nbsp;you&nbsp;configured&nbsp;the&nbsp;same&nbsp;number&nbsp;of&nbsp;total&nbsp;swap&nbsp;file&nbsp;pages).
#
#&nbsp;If&nbsp;you&nbsp;use&nbsp;a&nbsp;lot&nbsp;of&nbsp;small&nbsp;objects,&nbsp;use&nbsp;a&nbsp;page&nbsp;size&nbsp;of&nbsp;64&nbsp;or&nbsp;32&nbsp;bytes.
#&nbsp;If&nbsp;you&nbsp;use&nbsp;a&nbsp;lot&nbsp;of&nbsp;big&nbsp;objects,&nbsp;use&nbsp;a&nbsp;bigger&nbsp;page&nbsp;size.
#&nbsp;If&nbsp;unsure,&nbsp;use&nbsp;the&nbsp;default&nbsp;:)
vm-page-size&nbsp;32
Redis&nbsp;swap文件分成了很多的page，一个对象可以保存在多个page上面，但一个page上不能被多个对象共享，vm-page-size是要根据存储的&nbsp;数据大小来设定的，作者建议如果存储很多小对象，page大小最好设置为32或者64bytes；如果存储很大大对象，则可以使用更大的page，如果不&nbsp;确定，就使用默认值
#&nbsp;Number&nbsp;of&nbsp;total&nbsp;memory&nbsp;pages&nbsp;in&nbsp;the&nbsp;swap&nbsp;file.
#&nbsp;Given&nbsp;that&nbsp;the&nbsp;page&nbsp;table&nbsp;(a&nbsp;bitmap&nbsp;of&nbsp;free/used&nbsp;pages)&nbsp;is&nbsp;taken&nbsp;in&nbsp;memory,
#&nbsp;every&nbsp;8&nbsp;pages&nbsp;on&nbsp;disk&nbsp;will&nbsp;consume&nbsp;1&nbsp;byte&nbsp;of&nbsp;RAM.
#
#&nbsp;The&nbsp;total&nbsp;swap&nbsp;size&nbsp;is&nbsp;vm-page-size&nbsp;*&nbsp;vm-pages
#
#&nbsp;With&nbsp;the&nbsp;default&nbsp;of&nbsp;32-bytes&nbsp;memory&nbsp;pages&nbsp;and&nbsp;134217728&nbsp;pages&nbsp;Redis&nbsp;will
#&nbsp;use&nbsp;a&nbsp;4&nbsp;GB&nbsp;swap&nbsp;file,&nbsp;that&nbsp;will&nbsp;use&nbsp;16&nbsp;MB&nbsp;of&nbsp;RAM&nbsp;for&nbsp;the&nbsp;page&nbsp;table.
#
#&nbsp;It&#39;s&nbsp;better&nbsp;to&nbsp;use&nbsp;the&nbsp;smallest&nbsp;acceptable&nbsp;value&nbsp;for&nbsp;your&nbsp;application,
#&nbsp;but&nbsp;the&nbsp;default&nbsp;is&nbsp;large&nbsp;in&nbsp;order&nbsp;to&nbsp;work&nbsp;in&nbsp;most&nbsp;conditions.
vm-pages&nbsp;134217728
设置swap文件中的page数量，由于页表（一种表示页面空闲或使用的bitmap）是在放在内存中的，，在磁盘上每8个pages将消耗1byte的内存。
#&nbsp;Max&nbsp;number&nbsp;of&nbsp;VM&nbsp;I/O&nbsp;threads&nbsp;running&nbsp;at&nbsp;the&nbsp;same&nbsp;time.
#&nbsp;This&nbsp;threads&nbsp;are&nbsp;used&nbsp;to&nbsp;read/write&nbsp;data&nbsp;from/to&nbsp;swap&nbsp;file,&nbsp;since&nbsp;they
#&nbsp;also&nbsp;encode&nbsp;and&nbsp;decode&nbsp;objects&nbsp;from&nbsp;disk&nbsp;to&nbsp;memory&nbsp;or&nbsp;the&nbsp;reverse,&nbsp;a&nbsp;bigger
#&nbsp;number&nbsp;of&nbsp;threads&nbsp;can&nbsp;help&nbsp;with&nbsp;big&nbsp;objects&nbsp;even&nbsp;if&nbsp;they&nbsp;can&#39;t&nbsp;help&nbsp;with
#&nbsp;I/O&nbsp;itself&nbsp;as&nbsp;the&nbsp;physical&nbsp;device&nbsp;may&nbsp;not&nbsp;be&nbsp;able&nbsp;to&nbsp;couple&nbsp;with&nbsp;many
#&nbsp;reads/writes&nbsp;operations&nbsp;at&nbsp;the&nbsp;same&nbsp;time.
#
#&nbsp;The&nbsp;special&nbsp;value&nbsp;of&nbsp;0&nbsp;turn&nbsp;off&nbsp;threaded&nbsp;I/O&nbsp;and&nbsp;enables&nbsp;the&nbsp;blocking
#&nbsp;Virtual&nbsp;Memory&nbsp;implementation.
vm-max-threads&nbsp;4
设置访问swap文件的线程数,最好不要超过机器的核数,如果设置为0,那么所有对swap文件的操作都是串行的，可能会造成比较长时间的延迟。默认值为4
###############################&nbsp;ADVANCED&nbsp;CONFIG&nbsp;###############################
&nbsp;
#&nbsp;Hashes&nbsp;are&nbsp;encoded&nbsp;in&nbsp;a&nbsp;special&nbsp;way&nbsp;(much&nbsp;more&nbsp;memory&nbsp;efficient)&nbsp;when&nbsp;they
#&nbsp;have&nbsp;at&nbsp;max&nbsp;a&nbsp;given&nbsp;numer&nbsp;of&nbsp;elements,&nbsp;and&nbsp;the&nbsp;biggest&nbsp;element&nbsp;does&nbsp;not
#&nbsp;exceed&nbsp;a&nbsp;given&nbsp;threshold.&nbsp;You&nbsp;can&nbsp;configure&nbsp;this&nbsp;limits&nbsp;with&nbsp;the&nbsp;following
#&nbsp;configuration&nbsp;directives.
hash-max-zipmap-entries&nbsp;512
hash-max-zipmap-value&nbsp;64
指定在超过一定的数量或者最大的元素超过某一临界值时，采用一种特殊的哈希算法
#&nbsp;Similarly&nbsp;to&nbsp;hashes,&nbsp;small&nbsp;lists&nbsp;are&nbsp;also&nbsp;encoded&nbsp;in&nbsp;a&nbsp;special&nbsp;way&nbsp;in&nbsp;order
#&nbsp;to&nbsp;save&nbsp;a&nbsp;lot&nbsp;of&nbsp;space.&nbsp;The&nbsp;special&nbsp;representation&nbsp;is&nbsp;only&nbsp;used&nbsp;when
#&nbsp;you&nbsp;are&nbsp;under&nbsp;the&nbsp;following&nbsp;limits:
list-max-ziplist-entries&nbsp;512
list-max-ziplist-value&nbsp;64
&nbsp;
#&nbsp;Sets&nbsp;have&nbsp;a&nbsp;special&nbsp;encoding&nbsp;in&nbsp;just&nbsp;one&nbsp;case:&nbsp;when&nbsp;a&nbsp;set&nbsp;is&nbsp;composed
#&nbsp;of&nbsp;just&nbsp;strings&nbsp;that&nbsp;happens&nbsp;to&nbsp;be&nbsp;integers&nbsp;in&nbsp;radix&nbsp;10&nbsp;in&nbsp;the&nbsp;range
#&nbsp;of&nbsp;64&nbsp;bit&nbsp;signed&nbsp;integers.
#&nbsp;The&nbsp;following&nbsp;configuration&nbsp;setting&nbsp;sets&nbsp;the&nbsp;limit&nbsp;in&nbsp;the&nbsp;size&nbsp;of&nbsp;the
#&nbsp;set&nbsp;in&nbsp;order&nbsp;to&nbsp;use&nbsp;this&nbsp;special&nbsp;memory&nbsp;saving&nbsp;encoding.
set-max-intset-entries&nbsp;512
&nbsp;
#&nbsp;Similarly&nbsp;to&nbsp;hashes&nbsp;and&nbsp;lists,&nbsp;sorted&nbsp;sets&nbsp;are&nbsp;also&nbsp;specially&nbsp;encoded&nbsp;in
#&nbsp;order&nbsp;to&nbsp;save&nbsp;a&nbsp;lot&nbsp;of&nbsp;space.&nbsp;This&nbsp;encoding&nbsp;is&nbsp;only&nbsp;used&nbsp;when&nbsp;the&nbsp;length&nbsp;and
#&nbsp;elements&nbsp;of&nbsp;a&nbsp;sorted&nbsp;set&nbsp;are&nbsp;below&nbsp;the&nbsp;following&nbsp;limits:
zset-max-ziplist-entries&nbsp;128
zset-max-ziplist-value&nbsp;64
&nbsp;
#&nbsp;Active&nbsp;rehashing&nbsp;uses&nbsp;1&nbsp;millisecond&nbsp;every&nbsp;100&nbsp;milliseconds&nbsp;of&nbsp;CPU&nbsp;time&nbsp;in
#&nbsp;order&nbsp;to&nbsp;help&nbsp;rehashing&nbsp;the&nbsp;main&nbsp;Redis&nbsp;hash&nbsp;table&nbsp;(the&nbsp;one&nbsp;mapping&nbsp;top-level
#&nbsp;keys&nbsp;to&nbsp;values).&nbsp;The&nbsp;hash&nbsp;table&nbsp;implementation&nbsp;redis&nbsp;uses&nbsp;(see&nbsp;dict.c)
#&nbsp;performs&nbsp;a&nbsp;lazy&nbsp;rehashing:&nbsp;the&nbsp;more&nbsp;operation&nbsp;you&nbsp;run&nbsp;into&nbsp;an&nbsp;hash&nbsp;table
#&nbsp;that&nbsp;is&nbsp;rhashing,&nbsp;the&nbsp;more&nbsp;rehashing&nbsp;&quot;steps&quot;&nbsp;are&nbsp;performed,&nbsp;so&nbsp;if&nbsp;the
#&nbsp;server&nbsp;is&nbsp;idle&nbsp;the&nbsp;rehashing&nbsp;is&nbsp;never&nbsp;complete&nbsp;and&nbsp;some&nbsp;more&nbsp;memory&nbsp;is&nbsp;used
#&nbsp;by&nbsp;the&nbsp;hash&nbsp;table.
#&nbsp;
#&nbsp;The&nbsp;default&nbsp;is&nbsp;to&nbsp;use&nbsp;this&nbsp;millisecond&nbsp;10&nbsp;times&nbsp;every&nbsp;second&nbsp;in&nbsp;order&nbsp;to
#&nbsp;active&nbsp;rehashing&nbsp;the&nbsp;main&nbsp;dictionaries,&nbsp;freeing&nbsp;memory&nbsp;when&nbsp;possible.
#
#&nbsp;If&nbsp;unsure:
#&nbsp;use&nbsp;&quot;activerehashing&nbsp;no&quot;&nbsp;if&nbsp;you&nbsp;have&nbsp;hard&nbsp;latency&nbsp;requirements&nbsp;and&nbsp;it&nbsp;is
#&nbsp;not&nbsp;a&nbsp;good&nbsp;thing&nbsp;in&nbsp;your&nbsp;environment&nbsp;that&nbsp;Redis&nbsp;can&nbsp;reply&nbsp;form&nbsp;time&nbsp;to&nbsp;time
#&nbsp;to&nbsp;queries&nbsp;with&nbsp;2&nbsp;milliseconds&nbsp;delay.
#
#&nbsp;use&nbsp;&quot;activerehashing&nbsp;yes&quot;&nbsp;if&nbsp;you&nbsp;don&#39;t&nbsp;have&nbsp;such&nbsp;hard&nbsp;requirements&nbsp;but
#&nbsp;want&nbsp;to&nbsp;free&nbsp;memory&nbsp;asap&nbsp;when&nbsp;possible.
activerehashing&nbsp;yes
&nbsp;
##################################&nbsp;INCLUDES&nbsp;###################################
&nbsp;
#&nbsp;Include&nbsp;one&nbsp;or&nbsp;more&nbsp;other&nbsp;config&nbsp;files&nbsp;here.&nbsp;&nbsp;This&nbsp;is&nbsp;useful&nbsp;if&nbsp;you
#&nbsp;have&nbsp;a&nbsp;standard&nbsp;template&nbsp;that&nbsp;goes&nbsp;to&nbsp;all&nbsp;redis&nbsp;server&nbsp;but&nbsp;also&nbsp;need
#&nbsp;to&nbsp;customize&nbsp;a&nbsp;few&nbsp;per-server&nbsp;settings.&nbsp;&nbsp;Include&nbsp;files&nbsp;can&nbsp;include
#&nbsp;other&nbsp;files,&nbsp;so&nbsp;use&nbsp;this&nbsp;wisely.
#
#&nbsp;include&nbsp;/path/to/local.conf
#&nbsp;include&nbsp;/path/to/other.conf

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# Redis configuration file example

# Note on units: when memory size is needed, it is possible to specifiy

# it in the usual form of 1k 5GB 4M and so forth:

# 1k => 1000 bytes

# 1kb => 1024 bytes

# 1m => 1000000 bytes

# 1mb => 1024*1024 bytes

# 1g => 1000000000 bytes

# 1gb => 1024*1024*1024 bytes

# units are case insensitive so 1GB 1Gb 1gB are all the same.

# By default Redis does not run as a daemon. Use 'yes' if you need it.

# Note that Redis will write a pid file in /var/run/redis.pid when daemonized.

daemonize no  

Redis默认不是以守护进程的方式运行，可以通过该配置项修改，使用yes启用守护进程

# When running daemonized, Redis writes a pid file in /var/run/redis.pid by

# default. You can specify a custom pid file location here.

pidfile /var/run/redis.pid

当Redis以守护进程方式运行时，Redis默认会把pid写入/var/run/redis.pid文件，可以通过pidfile指定

# Accept connections on the specified port, default is 6379.

# If port 0 is specified Redis will not listen on a TCP socket.

port 6379

指定Redis监听端口，默认端口为6379

# If you want you can bind a single interface, if the bind option is not

# specified all the interfaces will listen for incoming connections.

# bind 127.0.0.1

绑定的主机地址

# Specify the path for the unix socket that will be used to listen for

# incoming connections. There is no default, so Redis will not listen

# on a unix socket when not specified.

# unixsocket /tmp/redis.sock

# unixsocketperm 755

# Close the connection after a client is idle for N seconds (0 to disable)

timeout 0

当 客户端闲置多长时间后关闭连接，如果指定为0，表示关闭该功能

# Set server verbosity to 'debug'

# it can be one of:

# debug (a lot of information, useful for development/testing)

# verbose (many rarely useful info, but not a mess like the debug level)

# notice (moderately verbose, what you want in production probably)

# warning (only very important / critical messages are logged)

loglevel verbose

指定日志记录级别，Redis总共支持四个级别：debug、verbose、notice、warning，默认为verbose

# Specify the log file name. Also 'stdout' can be used to force

# Redis to log on the standard output. Note that if you use standard

# output for logging but daemonize, logs will be sent to /dev/null

logfile stdout

日志记录方式，默认为标准输出，如果配置Redis为守护进程方式运行，而这里又配置为日志记录方式为标准输出，则日志将会发送给/dev/null

# To enable logging to the system logger, just set 'syslog-enabled' to yes,

# and optionally update the other syslog parameters to suit your needs.

# syslog-enabled no

# Specify the syslog identity.

# syslog-ident redis

# Specify the syslog facility.  Must be USER or between LOCAL0-LOCAL7.

# syslog-facility local0

# Set the number of databases. The default database is DB 0, you can select

# a different one on a per-connection basis using SELECT <dbid> where

# dbid is a number between 0 and 'databases'-1

databases 16

设置数据库的数量，默认数据库为0，可以使用SELECT <dbid>命令在连接上指定数据库id

################################ SNAPSHOTTING  #################################

# Save the DB on disk:

#   save <seconds> <changes>

#   Will save the DB if both the given number of seconds and the given

#   number of write operations against the DB occurred.

#   In the example below the behaviour will be to save:

#   after 900 sec (15 min) if at least 1 key changed

#   after 300 sec (5 min) if at least 10 keys changed

#   after 60 sec if at least 10000 keys changed

#   Note: you can disable saving at all commenting all the "save" lines.

save 900 1

save 300 10

save 60 10000

分别表示900秒（15分钟）内有1个更改，300秒（5分钟）内有10个更改以及60秒内有10000个更改。

指定在多长时间内，有多少次更新操作，就将数据同步到数据文件，可以多个条件配合

# Compress string objects using LZF when dump .rdb databases?

# For default that's set to 'yes' as it's almost always a win.

# If you want to save some CPU in the saving child set it to 'no' but

# the dataset will likely be bigger if you have compressible values or keys.

rdbcompression yes

指定存储至本地数据库时是否压缩数据，默认为yes，Redis采用LZF压缩，如果为了节省CPU时间，可以关闭该选项，但会导致数据库文件变的巨大

# The filename where to dump the DB

dbfilename dump.rdb

指定本地数据库文件名，默认值为dump.rdb

# The working directory.

# The DB will be written inside this directory, with the filename specified

# above using the 'dbfilename' configuration directive.

# Also the Append Only File will be created inside this directory.

# Note that you must specify a directory here, not a file name.

dir ./

指定本地数据库存放目录

################################# REPLICATION #################################

# Master-Slave replication. Use slaveof to make a Redis instance a copy of

# another Redis server. Note that the configuration is local to the slave

# so for example it is possible to configure the slave to save the DB with a

# different interval, or to listen to another port, and so on.

# slaveof <masterip> <masterport>

slaveof <masterip> <masterport> 设置当本机为slav服务时，设置master服务的IP地址及端口，在Redis启动时，它会自动从master进行数据同步

# If the master is password protected (using the "requirepass" configuration

# directive below) it is possible to tell the slave to authenticate before

# starting the replication synchronization process, otherwise the master will

# refuse the slave request.

# masterauth <master-password>

masterauth <master-password> 当master服务设置了密码保护时，slav服务连接master的密码

# When a slave lost the connection with the master, or when the replication

# is still in progress, the slave can act in two different ways:

# 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will

#    still reply to client requests, possibly with out of data data, or the

#    data set may just be empty if this is the first synchronization.

# 2) if slave-serve-stale data is set to 'no' the slave will reply with

#    an error "SYNC with master in progress" to all the kind of commands

#    but to INFO and SLAVEOF.

slave-serve-stale-data yes

# Slaves send PINGs to server in a predefined interval. It's possible to change

# this interval with the repl_ping_slave_period option. The default value is 10

# seconds.

# repl-ping-slave-period 10

# The following option sets a timeout for both Bulk transfer I/O timeout and

# master data or ping response timeout. The default value is 60 seconds.

# It is important to make sure that this value is greater than the value

# specified for repl-ping-slave-period otherwise a timeout will be detected

# every time there is low traffic between the master and the slave.

# repl-timeout 60

################################## SECURITY ###################################

# Require clients to issue AUTH <PASSWORD> before processing any other

# commands.  This might be useful in environments in which you do not trust

# others with access to the host running redis-server.

# This should stay commented out for backward compatibility and because most

# people do not need auth (e.g. they run their own servers).

# Warning: since Redis is pretty fast an outside user can try up to

# 150k passwords per second against a good box. This means that you should

# use a very strong password otherwise it will be very easy to break.

# requirepass foobared

 requirepass foobared 设置Redis连接密码，如果配置了连接密码，客户端在连接Redis时需要通过AUTH <password>命令提供密码，默认关闭

# Command renaming.

# It is possilbe to change the name of dangerous commands in a shared

# environment. For instance the CONFIG command may be renamed into something

# of hard to guess so that it will be still available for internal-use

# tools but not available for general clients.

# Example:

# rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52

# It is also possilbe to completely kill a command renaming it into

# an empty string:

# rename-command CONFIG ""

################################### LIMITS ####################################

# Set the max number of connected clients at the same time. By default there

# is no limit, and it's up to the number of file descriptors the Redis process

# is able to open. The special value '0' means no limits.

# Once the limit is reached Redis will close all the new connections sending

# an error 'max number of clients reached'.

# maxclients 128

maxclients 128 设置同一时间最大客户端连接数，默认无限制，Redis可以同时打开的客户端连接数为Redis进程可以打开的最大文件描述符数，如果设置 maxclients 0，表示不作限制。当客户端连接数到达限制时，Redis会关闭新的连接并向客户端返回max number of clients reached错误信息

# Don't use more memory than the specified amount of bytes.

# When the memory limit is reached Redis will try to remove keys with an

# EXPIRE set. It will try to start freeing keys that are going to expire

# in little time and preserve keys with a longer time to live.

# Redis will also try to remove objects from free lists if possible.

# If all this fails, Redis will start to reply with errors to commands

# that will use more memory, like SET, LPUSH, and so on, and will continue

# to reply to most read-only commands like GET.

# WARNING: maxmemory can be a good idea mainly if you want to use Redis as a

# 'state' server or cache, not as a real DB. When Redis is used as a real

# database the memory usage will grow over the weeks, it will be obvious if

# it is going to use too much memory in the long run, and you'll have the time

# to upgrade. With maxmemory after the limit is reached you'll start to get

# errors for write operations, and this may even lead to DB inconsistency.

# maxmemory <bytes>

 maxmemory <bytes>指定Redis最大内存限制，Redis在启动时会把数据加载到内存中，达到最大内存后，Redis会先尝试清除已到期或即将到期的Key，当此方法处理 后，仍然到达最大内存设置，将无法再进行写入操作，但仍然可以进行读取操作。Redis新的vm机制，会把Key存放内存，Value会存放在swap区

# MAXMEMORY POLICY: how Redis will select what to remove when maxmemory

# is reached? You can select among five behavior:

# volatile-lru -> remove the key with an expire set using an LRU algorithm

# allkeys-lru -> remove any key accordingly to the LRU algorithm

# volatile-random -> remove a random key with an expire set

# allkeys->random -> remove a random key, any key

# volatile-ttl -> remove the key with the nearest expire time (minor TTL)

# noeviction -> don't expire at all, just return an error on write operations

# Note: with all the kind of policies, Redis will return an error on write

#       operations, when there are not suitable keys for eviction.

#       At the date of writing this commands are: set setnx setex append

#       incr decr rpush lpush rpushx lpushx linsert lset rpoplpush sadd

#       sinter sinterstore sunion sunionstore sdiff sdiffstore zadd zincrby

#       zunionstore zinterstore hset hsetnx hmset hincrby incrby decrby

#       getset mset msetnx exec sort

# The default is:

# maxmemory-policy volatile-lru

# LRU and minimal TTL algorithms are not precise algorithms but approximated

# algorithms (in order to save memory), so you can select as well the sample

# size to check. For instance for default Redis will check three keys and

# pick the one that was used less recently, you can change the sample size

# using the following configuration directive.

# maxmemory-samples 3

############################## APPEND ONLY MODE ###############################

# By default Redis asynchronously dumps the dataset on disk. If you can live

# with the idea that the latest records will be lost if something like a crash

# happens this is the preferred way to run Redis. If instead you care a lot

# about your data and don't want to that a single record can get lost you should

# enable the append only mode: when this mode is enabled Redis will append

# every write operation received in the file appendonly.aof. This file will

# be read on startup in order to rebuild the full dataset in memory.

# Note that you can have both the async dumps and the append only file if you

# like (you have to comment the "save" statements above to disable the dumps).

# Still if append only mode is enabled Redis will load the data from the

# log file at startup ignoring the dump.rdb file.

# IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append

# log file in background when it gets too big.

appendonly no

appendonly no指定是否在每次更新操作后进行日志记录，Redis在默认情况下是异步的把数据写入磁盘，如果不开启，可能会在断电时导致一段时间内的数据丢失。因为 redis本身同步数据文件是按上面save条件来同步的，所以有的数据会在一段时间内只存在于内存中。默认为no

# The name of the append only file (default: "appendonly.aof")

# appendfilename appendonly.aof

 appendfilename appendonly.aof指定更新日志文件名，默认为appendonly.aof

# The fsync() call tells the Operating System to actually write data on disk

# instead to wait for more data in the output buffer. Some OS will really flush 

# data on disk, some other OS will just try to do it ASAP.

# Redis supports three different modes:

# no: don't fsync, just let the OS flush the data when it wants. Faster.

# always: fsync after every write to the append only log . Slow, Safest.

# everysec: fsync only if one second passed since the last fsync. Compromise.

# The default is "everysec" that's usually the right compromise between

# speed and data safety. It's up to you to understand if you can relax this to

# "no" that will will let the operating system flush the output buffer when

# it wants, for better performances (but if you can live with the idea of

# some data loss consider the default persistence mode that's snapshotting),

# or on the contrary, use "always" that's very slow but a bit safer than

# everysec.

# If unsure, use "everysec".

# appendfsync always

appendfsync everysec

# appendfsync no

指定更新日志条件，共有3个可选值：

no：表示等操作系统进行数据缓存同步到磁盘（快）

always：表示每次更新操作后手动调用fsync()将数据写到磁盘（慢，安全）

everysec：表示每秒同步一次（折衷，默认值）

# When the AOF fsync policy is set to always or everysec, and a background

# saving process (a background save or AOF log background rewriting) is

# performing a lot of I/O against the disk, in some Linux configurations

# Redis may block too long on the fsync() call. Note that there is no fix for

# this currently, as even performing fsync in a different thread will block

# our synchronous write(2) call.

# In order to mitigate this problem it's possible to use the following option

# that will prevent fsync() from being called in the main process while a

# BGSAVE or BGREWRITEAOF is in progress.

# This means that while another child is saving the durability of Redis is

# the same as "appendfsync none", that in pratical terms means that it is

# possible to lost up to 30 seconds of log in the worst scenario (with the

# default Linux settings).

# If you have latency problems turn this to "yes". Otherwise leave it as

# "no" that is the safest pick from the point of view of durability.

no-appendfsync-on-rewrite no

# Automatic rewrite of the append only file.

# Redis is able to automatically rewrite the log file implicitly calling

# BGREWRITEAOF when the AOF log size will growth by the specified percentage.

# This is how it works: Redis remembers the size of the AOF file after the

# latest rewrite (or if no rewrite happened since the restart, the size of

# the AOF at startup is used).

# This base size is compared to the current size. If the current size is

# bigger than the specified percentage, the rewrite is triggered. Also

# you need to specify a minimal size for the AOF file to be rewritten, this

# is useful to avoid rewriting the AOF file even if the percentage increase

# is reached but it is still pretty small.

# Specify a precentage of zero in order to disable the automatic AOF

# rewrite feature.

auto-aof-rewrite-percentage 100

auto-aof-rewrite-min-size 64mb

################################## SLOW LOG ###################################

# The Redis Slow Log is a system to log queries that exceeded a specified

# execution time. The execution time does not include the I/O operations

# like talking with the client, sending the reply and so forth,

# but just the time needed to actually execute the command (this is the only

# stage of command execution where the thread is blocked and can not serve

# other requests in the meantime).

# You can configure the slow log with two parameters: one tells Redis

# what is the execution time, in microseconds, to exceed in order for the

# command to get logged, and the other parameter is the length of the

# slow log. When a new command is logged the oldest one is removed from the

# queue of logged commands.

# The following time is expressed in microseconds, so 1000000 is equivalent

# to one second. Note that a negative number disables the slow log, while

# a value of zero forces the logging of every command.

slowlog-log-slower-than 10000

# There is no limit to this length. Just be aware that it will consume memory.

# You can reclaim memory used by the slow log with SLOWLOG RESET.

slowlog-max-len 1024

################################ VIRTUAL MEMORY ###############################

### WARNING! Virtual Memory is deprecated in Redis 2.4

### The use of Virtual Memory is strongly discouraged.

### WARNING! Virtual Memory is deprecated in Redis 2.4

### The use of Virtual Memory is strongly discouraged.

# Virtual Memory allows Redis to work with datasets bigger than the actual

# amount of RAM needed to hold the whole dataset in memory.

# In order to do so very used keys are taken in memory while the other keys

# are swapped into a swap file, similarly to what operating systems do

# with memory pages.

# To enable VM just set 'vm-enabled' to yes, and set the following three

# VM parameters accordingly to your needs.

vm-enabled no

指定是否启用虚拟内存机制，默认值为no，简单的介绍一下，VM机制将数据分页存放，由Redis将访问量较少的页即冷数据swap到磁盘上，访问多的页面由磁盘自动换出到内存中（在后面的文章我会仔细分析Redis的VM机制）

# vm-enabled yes

# This is the path of the Redis swap file. As you can guess, swap files

# can't be shared by different Redis instances, so make sure to use a swap

# file for every redis process you are running. Redis will complain if the

# swap file is already in use.

# The best kind of storage for the Redis swap file (that's accessed at random) 

# is a Solid State Disk (SSD).

# *** WARNING *** if you are using a shared hosting the default of putting

# the swap file under /tmp is not secure. Create a dir with access granted

# only to Redis user and configure Redis to create the swap file there.

vm-swap-file /tmp/redis.swap

虚拟内存文件路径，默认值为/tmp/redis.swap，不可多个Redis实例共享

# vm-max-memory configures the VM to use at max the specified amount of

# RAM. Everything that deos not fit will be swapped on disk *if* possible, that

# is, if there is still enough contiguous space in the swap file.

# With vm-max-memory 0 the system will swap everything it can. Not a good

# default, just specify the max amount of RAM you can in bytes, but it's

# better to leave some margin. For instance specify an amount of RAM

# that's more or less between 60 and 80% of your free RAM.

vm-max-memory 0

将所有大于vm-max-memory的数据存入虚拟内存,无论vm-max-memory设置多小,所有索引数据都是内存存储的(Redis的索引数据 就是keys),也就是说,当vm-max-memory设置为0的时候,其实是所有value都存在于磁盘。默认值为0

# Redis swap files is split into pages. An object can be saved using multiple

# contiguous pages, but pages can't be shared between different objects.

# So if your page is too big, small objects swapped out on disk will waste

# a lot of space. If you page is too small, there is less space in the swap

# file (assuming you configured the same number of total swap file pages).

# If you use a lot of small objects, use a page size of 64 or 32 bytes.

# If you use a lot of big objects, use a bigger page size.

# If unsure, use the default :)

vm-page-size 32

Redis swap文件分成了很多的page，一个对象可以保存在多个page上面，但一个page上不能被多个对象共享，vm-page-size是要根据存储的 数据大小来设定的，作者建议如果存储很多小对象，page大小最好设置为32或者64bytes；如果存储很大大对象，则可以使用更大的page，如果不 确定，就使用默认值

# Number of total memory pages in the swap file.

# Given that the page table (a bitmap of free/used pages) is taken in memory,

# every 8 pages on disk will consume 1 byte of RAM.

# The total swap size is vm-page-size * vm-pages

# With the default of 32-bytes memory pages and 134217728 pages Redis will

# use a 4 GB swap file, that will use 16 MB of RAM for the page table.

# It's better to use the smallest acceptable value for your application,

# but the default is large in order to work in most conditions.

vm-pages 134217728

设置swap文件中的page数量，由于页表（一种表示页面空闲或使用的bitmap）是在放在内存中的，，在磁盘上每8个pages将消耗1byte的内存。

# Max number of VM I/O threads running at the same time.

# This threads are used to read/write data from/to swap file, since they

# also encode and decode objects from disk to memory or the reverse, a bigger

# number of threads can help with big objects even if they can't help with

# I/O itself as the physical device may not be able to couple with many

# reads/writes operations at the same time.

# The special value of 0 turn off threaded I/O and enables the blocking

# Virtual Memory implementation.

vm-max-threads 4

设置访问swap文件的线程数,最好不要超过机器的核数,如果设置为0,那么所有对swap文件的操作都是串行的，可能会造成比较长时间的延迟。默认值为4

############################### ADVANCED CONFIG ###############################

# Hashes are encoded in a special way (much more memory efficient) when they

# have at max a given numer of elements, and the biggest element does not

# exceed a given threshold. You can configure this limits with the following

# configuration directives.

hash-max-zipmap-entries 512

hash-max-zipmap-value 64

指定在超过一定的数量或者最大的元素超过某一临界值时，采用一种特殊的哈希算法

# Similarly to hashes, small lists are also encoded in a special way in order

# to save a lot of space. The special representation is only used when

# you are under the following limits:

list-max-ziplist-entries 512

list-max-ziplist-value 64

# Sets have a special encoding in just one case: when a set is composed

# of just strings that happens to be integers in radix 10 in the range

# of 64 bit signed integers.

# The following configuration setting sets the limit in the size of the

# set in order to use this special memory saving encoding.

set-max-intset-entries 512

# Similarly to hashes and lists, sorted sets are also specially encoded in

# order to save a lot of space. This encoding is only used when the length and

# elements of a sorted set are below the following limits:

zset-max-ziplist-entries 128

zset-max-ziplist-value 64

# Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in

# order to help rehashing the main Redis hash table (the one mapping top-level

# keys to values). The hash table implementation redis uses (see dict.c)

# performs a lazy rehashing: the more operation you run into an hash table

# that is rhashing, the more rehashing "steps" are performed, so if the

# server is idle the rehashing is never complete and some more memory is used

# by the hash table.

# The default is to use this millisecond 10 times every second in order to

# active rehashing the main dictionaries, freeing memory when possible.

# If unsure:

# use "activerehashing no" if you have hard latency requirements and it is

# not a good thing in your environment that Redis can reply form time to time

# to queries with 2 milliseconds delay.

# use "activerehashing yes" if you don't have such hard requirements but

# want to free memory asap when possible.

activerehashing yes

################################## INCLUDES ###################################

# Include one or more other config files here.  This is useful if you

# have a standard template that goes to all redis server but also need

# to customize a few per-server settings.  Include files can include

# other files, so use this wisely.

# include /path/to/local.conf

# include /path/to/other.conf

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