Redis基础配置详解一文带你了解redis的基本配置

# Note on units: when memory size is needed, it is possible to specify
# it in the usual form of 1k 5GB 4M and so forth:
#
# 1k &＃61;> 1000 bytes
# 1kb &＃61;> 1024 bytes
# 1m &＃61;> 1000000 bytes
# 1mb &＃61;> 1024*1024 bytes
# 1g &＃61;> 1000000000 bytes
# 1gb &＃61;> 1024*1024*1024 bytes
#
# units are case insensitive so 1GB 1Gb 1gB are all the same.


这里表示的是redis中的配置大小单位&＃xff0c;开头定义了一些基本的度量单位&＃xff0c;只支持bytes&＃xff0c;不支持bit&＃xff0c;大小写不敏感

################################## NETWORK #####################################
# 网络相关配置
# By default, if no "bind" configuration directive is specified, Redis listens
# for connections from all available network interfaces on the host machine.
# It is possible to listen to just one or multiple selected interfaces using
# the "bind" configuration directive, followed by one or more IP addresses.
# Each address can be prefixed by "-", which means that redis will not fail to
# start if the address is not available. Being not available only refers to
# addresses that does not correspond to any network interfece. Addresses that
# are already in use will always fail, and unsupported protocols will always BE
# silently skipped.
#
# Examples:
#
# bind 192.168.1.100 10.0.0.1 # listens on two specific IPv4 addresses
# bind 127.0.0.1 ::1 # listens on loopback IPv4 and IPv6
# bind * -::* # like the default, all available interfaces
#
# ~~~ WARNING ~~~ If the computer running Redis is directly exposed to the
# internet, binding to all the interfaces is dangerous and will expose the
# instance to everybody on the internet. So by default we uncomment the
# following bind directive, that will force Redis to listen only on the
# IPv4 and IPv6 (if available) loopback interface addresses (this means Redis
# will only be able to accept client connections from the same host that it is
# running on).
#
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT OUT THE FOLLOWING LINE.
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#bind 127.0.0.1 -::1


默认情况bind&＃61;127.0.0.1只能接受本机的访问请求
不写的情况下&＃xff0c;无限制接受任何ip地址的访问
生产环境肯定要写应用服务器的地址&＃xff1b;服务器是需要远程访问的&＃xff0c;所以需要将其注释掉。
如果开启了protected_mode&＃xff0c;那么在没有设定bind ip且没有设密码的情况下&＃xff0c;Redis只允许接受本机的响应。

protected-mode no


将本机访问保护模式设置no&＃xff0c;支持远程访问

tcp-backlog 511


设置tcp的backlog&＃xff0c;backlog其实是一个连接队列&＃xff0c;backlog队列总和 &＃61; 未完成三次握手队列 &＃43; 已经完成三次握手队列
在高并发环境下你需要一个高 backlog 值来避免慢客户端连接问题
注意Linux内核会将这个值减小到/proc/sys/net/core/somaxconn的值&＃xff08;128&＃xff09;&＃xff0c;
所以需要确认增大/proc/sys/net/core/somaxconn 和 /poc/sys/net/ipv4/tcp_syn_backlog(128)两个值来达到想要的效果

timeout 0


表示客户端连接的时间&＃xff0c;0表示永不超时

tcp-keepalive 300


检测是否在操作&＃xff0c;如果超过指定时间没有操作&＃xff0c;那么就会自动结束服务&＃xff0c;这里的数值代表每隔多少秒检测一次

daemonize yes


表示是否为后台进程&＃xff0c;设置为yes&＃xff0c;守护进程&＃xff0c;允许后台运行

pidfile /var/run/redis_6379.pid


存放pid文件的位置&＃xff0c;每个实例会产生一个不同的pid文件

# Specify the server verbosity level.
# This 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 notice


表示日志的级别

# Specify the log file name. Also the empty string 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 ""


设置日志的输出路径&＃xff0c;默认为空

# IMPORTANT NOTE: starting with Redis 6 "requirepass" is just a compatibility
# layer on top of the new ACL system. The option effect will be just setting
# the password for the default user. Clients will still authenticate using
# AUTH <password> as usually, or more explicitly with AUTH default <password>
# if they follow the new protocol: both will work.
#
# The requirepass is not compatable with aclfile option and the ACL LOAD
# command, these will cause requirepass to be ignored.
#
# requirepass foobared


访问密码的查看/设置和取消
在命令中设置密码&＃xff0c;只是临时的。重启redis服务器&＃xff0c;密码就还原了。
永久设置&＃xff0c;需要在配置文件中进行设置

maxclients 10000


设置redis同时可以与多少客户端进行连接
默认情况下为10000个客户端
如果达到了此限制&＃xff0c;redis则会新的连接请求&＃xff0c;并且像这些连接请求方发出"max number of clients reached"以作回应

maxmemory-policy noeviction


建议必须设置&＃xff0c;否则&＃xff0c;将内存占满&＃xff0c;造成服务器宕机
设置redis可以使用的内存量。一旦到达内存使用上限&＃xff0c;redis将会试图移除内部数据&＃xff0c;移除规则可以通过maxmemory-policy来指定

maxmemory-samples 5


设置样本数量&＃xff0c;LRU算法和最小TTL算法都并非是精确的算法&＃xff0c;而是估算值&＃xff0c;所以可以设置样本的大小&＃xff0c;redis默认会检查这么多个key并选择其中LRU的那个
一般设置3到7的数字&＃xff0c;数值越小样本越不准确&＃xff0c;但是性能消耗越小