redis.conf配置文件详细讲解(一)

1.      内存大小配置说明node

[redis@Centos6 ~]$ cat run/redis-3.2.6/redis.confredis

# Redis configuration file example.安全

#服务器

# Note that in order to read the configuration file, Redis must be网络

# started with the file path as first argument:dom

#socket

# ./redis-server /path/to/redis.conftcp

 

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

# it in the usual form of 1k 5GB 4M andso forth:[l1] oop

#

# 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.[l2] 

2.      INCLUEDS设置说明

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

 

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

# have a standard template that goes toall Redis servers but also need

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

# other files, so use this wisely.[l3] 

#

# Noticeoption "include" won't be rewritten by command "CONFIGREWRITE"

# from admin or Redis Sentinel. SinceRedis always uses the last processed

# line as value of a configurationdirective, you'd better put includes

# at the beginning of this file to avoidoverwriting config change at runtime.[l4] 

#

# Ifinstead you are interested in using includes to override configuration

# options, it is better to use include asthe last line.[l5] 

#

# include /path/to/local.conf

# include /path/to/other.conf

3.      网络配置说明

######NETWORK #####################################[l6] 

 

# Bydefault, if no "bind" configuration directive is specified, Redislistens

# for connections from all the networkinterfaces available on the server.

# It is possible to listen to just one ormultiple selected interfaces using

# the "bind" configurationdirective, followed by one or more IP addresses.[l7] 

#

# Examples:

#

# bind 192.168.1.100 10.0.0.1

# bind 127.0.0.1 ::1

#

# ~~~WARNING ~~~ If the computer running Redis is directly exposed to the

# internet, binding to all the interfacesis dangerous and will expose the

# instance to everybody on the internet.So by default we uncomment the

# following bind directive, that willforce Redis to listen only into

# the IPv4 lookback interface address(this means Redis will be able to

# accept connections only from clientsrunning into the same computer it

# is running).[l8] 

#

# IFYOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES

# JUST COMMENT THE FOLLOWING LINE.[l9] 

#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

bind 127.0.0.1

 

# Protectedmode is a layer of security protection, in order to avoid that

# Redis instances left open on theinternet are accessed and exploited.[l10] 

#

# Whenprotected mode is on and if:[l11] 

#

# 1)The server is not binding explicitly to a set of addresses using the

#   "bind" directive.[l12] 

# 2) Nopassword is configured.[l13] 

#

#The server only accepts connections from clients connecting from the

# IPv4 and IPv6 loopback addresses127.0.0.1 and ::1, and from Unix domain

# sockets.[l14] 

#

# Bydefault protected mode is enabled. You should disable it only if

# you are sure you want clients fromother hosts to connect to Redis

# even if no authentication isconfigured, nor a specific set of interfaces

# are explicitly listed using the"bind" directive.[l15] 

protected-modeyes[l16] 

 

#Accept connections on the specified port, default is 6379 (IANA #815344).

# If port 0 is specified Redis will notlisten on a TCP socket.[l17] 

port 6379

 

#TCP listen() backlog.[l18] 

#

#In high requests-per-second environments you need an high backlog in order

# to avoid slow clients connectionsissues. Note that the Linux kernel

# will silently truncate it to the valueof /proc/sys/net/core/somaxconn so

# make sure to raise both the value ofsomaxconn and tcp_max_syn_backlog

# in order to get the desired effect.[l19] 

tcp-backlog 511

 

# Unix socket.

#

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

# incoming connections. There is nodefault, so Redis will not listen

# on a unix socket when not specified.[l20] 

#

# unixsocket /tmp/redis.sock

# unixsocketperm 700

 

# Closethe connection after a client is idle for N seconds (0 to disable)[l21] 

timeout 0

 

# TCP keepalive.

#

# Ifnon-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence

# of communication. This is useful fortwo reasons:[l22] 

#

# 1)Detect dead peers.

# 2) Take the connection alive from thepoint of view of network

#   equipment in the middle.[l23] 

#

# OnLinux, the specified value (in seconds) is the period used to send ACKs.

# Note that to close the connection thedouble of the time is needed.

# On other kernels the period depends onthe kernel configuration.[l24] 

#

#A reasonable value for this option is 300 seconds, which is the new

# Redis default starting with Redis3.2.1.[l25] 

tcp-keepalive 300


 [l1]当须要为某个配置项指定内存大小的时候,必需要带上单位,同城的格式是1k5gb4m

 [l2]单位不区分大小写,1GB1GB1GB都同样。

 [l3]在此处包含一个或多个其余配置文件。若是您有一个标准模板可用于全部Redis服务器,但还须要自定义几个每服务器设置,这将很是有用。包含文件能够包括其余文件,所以请明智地使用。

 [l4]注意选项“include”不会被来自adminRedisSentinel的命令“CONFIG REWRITE”重写。因为Redis老是使用最后处理的行做为配置指令的值,所以最好将include包含在此文件的开头,以免在运行时覆盖配置更改

 [l5]相反,若是你有兴趣使用包括覆盖配置选项,最好是使用包括做为最后一道防线。

 [l6]网络配置说明

 [l7]默认状况下,若是没有指定“bind”配置指令,Redis会监听来自服务器上全部可用网络接口的链接。 可使用“绑定”配置指令侦听一个或多个选定的接口,而后跟一个或多个IP地址。

 [l8]~~~警告~~~若是运行Redis的计算机直接暴露在互联网上,绑定到全部接口是危险的,而且会将实例暴露给互联网上的每一个人。所以,在默认状况下,咱们取消如下绑定指令,这将迫使Redis的只监听到的IPv4回望接口地址(这意味着Redis的将只能从运行到正在运行在同一台计算机的客户端接受链接)。

 [l9]若是你确信你想你的实例可以监听到全部的界面,注释下面一行。

 [l10]保护模式是安全的保护层,以免该Redis的实例留在互联网上公开被访问和利用。

 [l11]当保护模式打开时,若是:

 [l12]1)服务器没有使用“bind”指令明确绑定到一组地址。

 [l13]2)未配置密码。

 [l14]服务器只接受来自从IPv4IPv6环回地址127.0.0.1:: 1以及从Unix域套接字链接的客户端的链接。

 [l15]默认状况下启用保护模式。 只有确保您但愿来自其余主机的客户端链接到Redis,即便未配置身份验证,也不会使用“bind”指令明确列出特定的接口集,才应禁用它。

 [l16]启用保护模式

 [l17]接受指定端口上的链接,默认值为6379IANA815344)。若是指定端口0Redis将不会侦听TCP套接字。

 [l18]TCP监听的最大容纳数量

 [l19]在高请求每秒环境中,您须要一个高的容纳数量,以免缓慢的客户端链接问题。注意,Linux内核会将其默认截断为/ proc / sys / net / core / somaxconn的值,所以请务必同时提升somaxconntcp_max_syn_backlog的值,以得到所需的效果。

 [l20]指定将用于侦听传入链接的Unix套接字的路径。 没有默认值,因此Redis在没有指定的时候不会监听unixsocket

 [l21]客户端空闲N秒后关闭链接(0禁用)

 [l22]若是非零,则使用SO_KEEPALIVE在没有通讯的状况下向客户端发送TCP ACK这有两个缘由:

 [l23]1)检测死对等体。
2)从中间的网络设备的角度来看链接活着

 [l24]Linux上,指定的值(以秒为单位)是用于发送ACK的周期。注意,要关闭链接,须要两倍的时间。在其余内核上,周期取决于内核配置。

 [l25]此选项的合理值为300秒,这是从Redis 3.2.1开始的新Redis默认值。

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