redis.conf配置文件詳細講解(一)

1.      內存大小配置說明

[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 size is needed, it is possible to specify

# 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設置說明

####### 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.      網絡配置說明

######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]當須要爲某個配置項指定內存大小的時候，必需要帶上單位，同城的格式是1k，5gb，4m等

 [l2]單位不區分大小寫，1GB，1GB，1GB都同樣。

 [l3]在此處包含一個或多個其餘配置文件。若是您有一個標準模板可用於全部Redis服務器，但還須要自定義幾個每服務器設置，這將很是有用。包含文件能夠包括其餘文件，所以請明智地使用。

 [l4]注意選項「include」不會被來自admin或RedisSentinel的命令「CONFIG REWRITE」重寫。因爲Redis老是使用最後處理的行做爲配置指令的值，所以最好將include包含在此文件的開頭，以免在運行時覆蓋配置更改

 [l5]相反，若是你有興趣使用包括覆蓋配置選項，最好是使用包括做爲最後一道防線。

 [l6]網絡配置說明

 [l7]默認狀況下，若是沒有指定「bind」配置指令，Redis會監聽來自服務器上全部可用網絡接口的鏈接。 可使用「綁定」配置指令偵聽一個或多個選定的接口，而後跟一個或多個IP地址。

 [l8]~~~警告~~~若是運行Redis的計算機直接暴露在互聯網上，綁定到全部接口是危險的，而且會將實例暴露給互聯網上的每一個人。所以，在默認狀況下，咱們取消如下綁定指令，這將迫使Redis的只監聽到的IPv4回望接口地址（這意味着Redis的將只能從運行到正在運行在同一臺計算機的客戶端接受鏈接）。

 [l9]若是你確信你想你的實例可以監聽到全部的界面，註釋下面一行。

 [l10]保護模式是安全的保護層，以免該Redis的實例留在互聯網上公開被訪問和利用。

 [l11]當保護模式打開時，若是：

 [l12]1）服務器沒有使用「bind」指令明確綁定到一組地址。

 [l13]2）未配置密碼。

 [l14]服務器只接受來自從IPv4和IPv6環回地址127.0.0.1和:: 1以及從Unix域套接字鏈接的客戶端的鏈接。

 [l15]默認狀況下啓用保護模式。 只有確保您但願來自其餘主機的客戶端鏈接到Redis，即便未配置身份驗證，也不會使用「bind」指令明確列出特定的接口集，才應禁用它。

 [l16]啓用保護模式

 [l17]接受指定端口上的鏈接，默認值爲6379（IANA＃815344）。若是指定端口0，Redis將不會偵聽TCP套接字。

 [l18]TCP監聽的最大容納數量

 [l19]在高請求每秒環境中，您須要一個高的容納數量，以免緩慢的客戶端鏈接問題。注意，Linux內核會將其默認截斷爲/ proc / sys / net / core / somaxconn的值，所以請務必同時提升somaxconn和tcp_max_syn_backlog的值，以得到所需的效果。

 [l20]指定將用於偵聽傳入鏈接的Unix套接字的路徑。 沒有默認值，因此Redis在沒有指定的時候不會監聽unixsocket

 [l21]客戶端空閒N秒後關閉鏈接（0禁用）

 [l22]若是非零，則使用SO_KEEPALIVE在沒有通訊的狀況下向客戶端發送TCP ACK。這有兩個緣由：

 [l23]1）檢測死對等體。
2）從中間的網絡設備的角度來看鏈接活着

 [l24]在Linux上，指定的值（以秒爲單位）是用於發送ACK的週期。注意，要關閉鏈接，須要兩倍的時間。在其餘內核上，週期取決於內核配置。

 [l25]此選項的合理值爲300秒，這是從Redis 3.2.1開始的新Redis默認值。