redis哨兵模式主从自动切换

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哨兵模式主要用于主从库异常检测，自动完成异常状态下的切换，演示下配置过程。
配置环境：

[root@Redis-01 ~]# cat /etc/redhat-release
CentOS Linux release 7.4.1708 (Core)
[root@Redis-01 ~]# uname -a
Linux Redis-01 3.10.0-693.17.1.el7.x86_64 #1 SMP Thu Jan 25 20:13:58 UTC 2018 x86_64 x86_64 x86_64 GNU/LinuxSourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/
主库： 1.1.1.151 从库：1.1.1.152 SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/

主从搭建：SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/

$ yum install gcc gcc-c++ vim wget tcl tcl-devel -y $ cd redis-3.2.0 $ make MALLOC=jemalloc $ make PREFIX=/opt/redis-3.2.0 install $ ln -s opt/redis-3.2.0 /usr/local/redis $ mkdir /usr/local/redis/{etc,cache} $ cp redis.conf /usr/local/redis/etc $ sysctl vm.overcommit_memory=1 $ echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf $ echo 1024 >/proc/sys/net/core/somaxconn $ cd /usr/local/redis/etc $ cp redis.conf redis.conf.$(date +%F) $ sed -i "s#daemonize no#daemonize yes#g" redis.conf $ sed -i 's#logfile ""#logfile "/var/log/redis.log"#g' redis.conf $ sed -i 's#dir ./#dir /usr/local/redis/cache#g' redis.conf $ sed -i "s#appendonly no#appendonly yes#g" redis.conf $ mkdir /usr/local/redis/{etc,cache} ##主## $ sed -i 's/\# requirepass foobared/requirepass 123456/g' redis.conf ##从## $ sed -i 's/\# slaveof <masterip> <masterport>/slaveof 192.168.227.23 6379/g' redis.conf $ sed -i 's/\# masterauth <master-password>/masterauth 123456/g' redis.conf

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$ yum install gcc gcc-c++ vim wget tcl tcl-devel -y
$ cd redis-3.2.0
$ make MALLOC=jemalloc
$ make PREFIX=/opt/redis-3.2.0 install
$ ln -s opt/redis-3.2.0 /usr/local/redis
$ mkdir /usr/local/redis/{etc,cache}
$ cp redis.conf /usr/local/redis/etc
$ sysctl vm.overcommit_memory=1
$ echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
$ echo 1024 >/proc/sys/net/core/somaxconn
$ cd /usr/local/redis/etc
$ cp redis.conf redis.conf.$(date +%F)
$ sed -i "s#daemonize no#daemonize yes#g" redis.conf
$ sed -i 's#logfile ""#logfile "/var/log/redis.log"#g' redis.conf
$ sed -i 's#dir ./#dir /usr/local/redis/cache#g' redis.conf
$ sed -i "s#appendonly no#appendonly yes#g" redis.conf
$ mkdir /usr/local/redis/{etc,cache}

##主##
$ sed -i 's/\# requirepass foobared/requirepass 123456/g' redis.conf
##从##
$ sed -i 's/\# slaveof <masterip> <masterport>/slaveof 192.168.227.23 6379/g' redis.conf
$ sed -i 's/\# masterauth <master-password>/masterauth 123456/g' redis.conf

SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/
主库状态：

$ /usr/local/redis/bin/redis-cli -h 192.168.227.23 -p 6379 -a 123456 info Replication Warning: Using a password with '-a' option on the command line interface may not be safe. # Replication role:master connected_slaves:1 slave0:ip=192.168.227.24,port=6379,state=online,offset=182,lag=1 master_replid:e7e539b15b1c0014d88e66a0cee61b0503138733 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:196 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:1 repl_backlog_histlen:196

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$ /usr/local/redis/bin/redis-cli -h 192.168.227.23 -p 6379 -a 123456 info Replication
Warning: Using a password with '-a' option on the command line interface may not be safe.
# Replication
role:master
connected_slaves:1
slave0:ip=192.168.227.24,port=6379,state=online,offset=182,lag=1
master_replid:e7e539b15b1c0014d88e66a0cee61b0503138733
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:196
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:1
repl_backlog_histlen:196

从库状态：

$ /usr/local/redis/bin/redis-cli -h 192.168.227.24 -p 6379 -a 123456 info Replication Warning: Using a password with '-a' option on the command line interface may not be safe. # Replication role:slave master_host:192.168.227.23 master_port:6379 master_link_status:up master_last_io_seconds_ago:7 master_sync_in_progress:0 slave_repl_offset:238 slave_priority:100 slave_read_only:1 connected_slaves:0 master_replid:e7e539b15b1c0014d88e66a0cee61b0503138733 master_replid2:0000000000000000000000000000000000000000 master_repl_offset:238 second_repl_offset:-1 repl_backlog_active:1 repl_backlog_size:1048576 repl_backlog_first_byte_offset:43 repl_backlog_histlen:196

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$ /usr/local/redis/bin/redis-cli -h 192.168.227.24 -p 6379 -a 123456 info Replication
Warning: Using a password with '-a' option on the command line interface may not be safe.
# Replication
role:slave
master_host:192.168.227.23
master_port:6379
master_link_status:up
master_last_io_seconds_ago:7
master_sync_in_progress:0
slave_repl_offset:238
slave_priority:100
slave_read_only:1
connected_slaves:0
master_replid:e7e539b15b1c0014d88e66a0cee61b0503138733
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:238
second_repl_offset:-1
repl_backlog_active:1
repl_backlog_size:1048576
repl_backlog_first_byte_offset:43
repl_backlog_histlen:196

SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/

哨兵模式:SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/

$ cat /usr/local/redis/etc/sentinel.conf protected-mode no # 切换主从需要2台同意，可以配置为1台 sentinel monitor t4x 192.168.227.23 6379 1 sentinel down-after-milliseconds t4x 30000 sentinel failover-timeout t4x 180000 sentinel notification-script t4x /data/scripts/redis_sentinel.sh protected-mode no port 26379 dir /tmp sentinel monitor mymaster 127.0.0.1 6379 2 sentinel auth-pass mymaster 123456 sentinel down-after-milliseconds mymaster 20000 sentinel parallel-syncs mymaster 1 sentinel failover-timeout mymaster 20000 sentinel deny-scripts-reconfig yes

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$ cat /usr/local/redis/etc/sentinel.conf
protected-mode no
# 切换主从需要2台同意，可以配置为1台
sentinel monitor t4x 192.168.227.23 6379 1
sentinel down-after-milliseconds t4x 30000
sentinel failover-timeout t4x 180000
sentinel notification-script t4x /data/scripts/redis_sentinel.sh

protected-mode no
port 26379
dir /tmp
sentinel monitor mymaster 127.0.0.1 6379 2
sentinel auth-pass mymaster 123456
sentinel down-after-milliseconds mymaster 20000
sentinel parallel-syncs mymaster 1
sentinel failover-timeout mymaster 20000
sentinel deny-scripts-reconfig yes

SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/

Redis启动脚本:

#!/bin/bash
# Author:Byrd
# Version:0.1
# Site:note.t4x.org
# Contact:root#t4x.org
redis_dir="/usr/local/redis"
redis_config="/usr/local/redis/etc/redis.conf"
redis_status=`netstat -tunpl | grep 6379 | wc -l`
start () {
if [ "{redis_status}" -eq 0 ]; then
    {redis_dir}/bin/redis-server ${redis_config} &
    return_value=$?
    if [ "${return_value}" -eq 0 ]; then
        echo "redis start successful"
    else
        echo "redis start fault, please check config file" 
    fi
else
    echo "redis in running"
fi
}
stop () {
 
if [ {redis_status} -gt 0 ]; then
    redis_pid=`netstat -tunpl | grep redis | awk "NR==1" | awk '{print $7}' | awk -F "/" '{print $1}'`
    kill -9 {redis_pid}
    return_value=$?
    if [ "${return_value}" -eq 0 ]; then
        echo "redis stop successful"
    else
        echo "redis stop fault, please check redis status" 
    fi
else
    echo "redis in not running, please execure $0 start"
fi
}
case "$1" in
    start)
        start && exit 0
        ;;
    stop)
        stop || exit 2 
        ;;
    *)
        echo $"Usage: $0 {start|stop}"
        exit 2
esac
exit $?

#!/bin/bash

# Author:Byrd

# Version:0.1

# Site:note.t4x.org

# Contact:root#t4x.org

redis_dir="/usr/local/redis"

redis_config="/usr/local/redis/etc/redis.conf"

redis_status=`netstat -tunpl | grep 6379 | wc -l`

start () {

if [ "{redis_status}" -eq 0 ]; then

{redis_dir}/bin/redis-server ${redis_config} &

return_value=$?

if [ "${return_value}" -eq 0 ]; then

echo "redis start successful"

else

echo "redis start fault, please check config file"

else

echo "redis in running"

}

stop () {

if [ {redis_status} -gt 0 ]; then

redis_pid=`netstat -tunpl | grep redis | awk "NR==1" | awk '{print $7}' | awk -F "/" '{print $1}'`

kill -9 {redis_pid}

return_value=$?

if [ "${return_value}" -eq 0 ]; then

echo "redis stop successful"

else

echo "redis stop fault, please check redis status"

else

echo "redis in not running, please execure $0 start"

}

case "$1" in

start)

start && exit 0

;;

stop)

stop || exit 2

;;

echo $"Usage: $0 {start|stop}"

exit 2

esac

exit $?

SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/

参考文档
1：http://blog.csdn.net/u014756827/article/details/52383103
2：http://blog.csdn.net/a67474506/article/details/50435498SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/ SourceByrd's Weblog-https://note.t4x.org/basic/redis-sentinel-listen/

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