Redis sentinel主从切换环境配置及服务器搭建

1.下载安装redis（v2.8以上支持，建议使用3.X以上版本）：http://redis.io/download

解压缩，拷贝文件夹到指定目录下，我本机安装在/usr/local/redis-3.0.7

进入该目录下/usr/local/redis-3.0.7执行以下命令

编译测试：sudo make test

编译安装：sudo make install

等安装完毕，执行命令：./bin/redis-server

这时候界面会出现下图：

2.接下来我们就要开始配置单机多个实例，实现主－从－sentinel模式。

（1）规划并建立目录以存放redis的配置文件或是redis数据，

mkdir /etc/redis ——redis的配置目录
mkdir /var/redis ——redis的存放数据的目录
mkdir /var/redis/log ——redis的日志文件的存放目录
mkdir /var/redis/run ——redis的pid文件的存放目录
mkdir /var/redis/redis_6379——redis实例的工作目录
mkdir /var/redis/redis_6380——redis实例的工作目录

（2）从redis安装目录下分别复制两个配置文件redis.conf、sentinel.conf 到/etc/redis目录下:

# cp redis.conf /etc/redis/redis_6379.conf

# cp redis.conf /etc/redis/redis_6380.conf

# cp sentinel.conf /etc/redis/sentinel_26379.conf

（3）接下来，我们依次修改配置文件redis_6379.conf 和redis_6380.conf

修改配置文件，修改的有以下内容：

Set daemonize to yes (by default it is set to no).
Set the pidfile to /var/redis/run/redis_6379.pid (modify the port if needed).
Change the port accordingly. In our example it is not needed as the default port is already 6379.
Set your preferred loglevel.
Set the logfile to /var/redis/log/redis_6379.log
Set the dir to /var/redis/6379 (very important step!)
#配置开始
# 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 yes
# 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/redis/run/redis_6379.pid
# Accept connections on the specified port, default is 6379.
# If port 0 is specified Redis will not listen on a TCP socket.
port 6379
# 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
# 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 /var/redis/log/redis_6379.log
# The working directory.
# The DB will be written inside this directory, with the filename specified
# above using the 'dbfilename' configuration directive.
# The Append Only File will also be created inside this directory.
# Note that you must specify a directory here, not a file name.
dir /var/redis/redis_6379

同理，redis_6380.conf只需把上面的6379替换成6380即可。

（4）配置redis实例启动脚本

复制redis_init_script脚本放到/etc/init.d目录中，

[root@changle redis-3.0.7]# cp utils/redis_init_script /etc/init.d/redis_6379

[root@changle redis-3.0.7]# cp utils/redis_init_script /etc/init.d/redis_6380

然后打开脚本，/etc/init.d/redis_6379

[root@changle redis-3.0.7]# vi /etc/init.d/redis_6379

修改文件内容如下（redis_6380同样如此）：

REDISPORT=6379

EXEC=/usr/local/ redis-3.0.7/bin/redis-server

CLIEXEC=/usr/local/redis-3.0.7/bin/redis-cli

PIDFILE=/var/redis/run/redis_${REDISPORT}.pid

CONF=/etc/redis/${REDISPORT}.conf

:wq!保存启动看看。

下面开始启动redis 6379，配置的端口为6379，如下，

[root@changle redis-3.0.7]# /etc/init.d/redis_6379 start Starting Redis server...

启动redis 6380也是一样

[root@changle redis-3.0.7]# /etc/init.d/redis_6380 start Starting Redis server...

（4）6379和6380都能正常启动后，我们就可以配置主从关系了，这时候我们修改6380的配置文件redis_6380.conf

追加内容：slaveof 127.0.0.1 6379

配置6380的master是6379.

再次重启6379和6380，在登陆redis-cli客户端输入info观看：

6379显示的信息如下：

6380显示的信息如下：

可以看到，6380从属于6379实例。咱们的主从已经搭建完毕。

（5）下面开始配置sentinel_26379.conf

vim /etc/redis/sentinel.conf

##redis-0 ##sentinel实例之间的通讯端口

port 26379

#master1

sentinel monitor master1 192.168.9.18 6379 1

sentinel down-after-milliseconds master1 3000

sentinel failover-timeout master1 900000

sentinel can-failover master1 yes

sentinel parallel-syncs master1 2

:wq!保存退出。

启动sentinel，观察控制台，打印输出是否如下：

已经正确监视6379master实例了。