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[经验分享] redis.conf配置文件详细讲解(一)

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发表于 2018-11-4 11:04:28 | 显示全部楼层 |阅读模式
  1.      内存大小配置说明
  [redis@Centos6 ~]$ cat run/redis-3.2.6/redis.conf
  # Redis configuration file example.
  #
  # Note that in order to read the configuration file, Redis must be
  # started with the file path as first argument:
  #
  # ./redis-server /path/to/redis.conf

  # Note on units: when memory>  # it in the usual form of 1k 5GB 4M andso forth:[l1]
  #
  # 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>  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]当需要为某个配置项指定内存大小的时候,必须要带上单位,同城的格式是1k,5gb,4m等
  [l2]单位不区分大小写,1GB,1GB,1GB都一样。
  [l3]在此处包含一个或多个其他配置文件。如果您有一个标准模板可用于所有Redis服务器,但还需要自定义几个每服务器设置,这将非常有用。包含文件可以包括其他文件,因此请明智地使用。
  [l4]注意选项“include”不会被来自admin或RedisSentinel的命令“CONFIG REWRITE”重写。由于Redis总是使用最后处理的行作为配置指令的值,因此最好将include包含在此文件的开头,以避免在运行时覆盖配置更改
  [l5]相反,如果你有兴趣使用包括覆盖配置选项,最好是使用包括作为最后一道防线。
  [l6]网络配置说明
  [l7]默认情况下,如果没有指定“bind”配置指令,Redis会监听来自服务器上所有可用网络接口的连接。 可以使用“绑定”配置指令侦听一个或多个选定的接口,然后跟一个或多个IP地址。
  [l8]~~~警告~~~如果运行Redis的计算机直接暴露在互联网上,绑定到所有接口是危险的,并且会将实例暴露给互联网上的每个人。因此,在默认情况下,我们取消以下绑定指令,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连接)。
  [l9]如果你确信你想你的实例能够监听到所有的界面,注释下面一行。
  [l10]保护模式是安全的保护层,以避免该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,如果:
  [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IPv4和IPv6环回地址127.0.0.1和:: 1以及从Unix域套接字连接的客户端的连接。
  [l15]默认情况下启用保护模式。 只有确保您希望来自其他主机的客户端连接到Redis,即使未配置身份验证,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]接受指定端口上的连接,默认值为6379(IANA#815344)。如果指定端口0,Redis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,您需要一个高的容纳数量,以避免缓慢的客户端连接问题。注意,Linux内核会将其默认截断为/ proc / sys / net / core / somaxconn的值,因此请务必同时提高somaxconn和tcp_max_syn_backlog的值,以获得所需的效果。
  [l20]指定将用于侦听传入连接的Unix套接字的路径。 没有默认值,所以Redis在没有指定的时候不会监听unixsocket
  [l21]客户端空闲N秒后关闭连接(0禁用)
  [l22]如果非零,则使用SO_KEEPALIVE在没有通信的情况下向客户端发送TCP ACK。这有两个原因:
  [l23]1)检测死对等体。
  2)从中间的网络设备的角度来看连接活着
  [l24]在Linux上,指定的值(以秒为单位)是用于发送ACK的周期。注意,要关闭连接,需要两倍的时间。在其他内核上,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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