Redis+Keeplived实现高可用

Posted 2020-09-24

博文说明【前言】：

    本文将通过个人口吻介绍Redis+Keeplived实现高可用的相关知识，在目前时间点【2017年6月23号】下，所掌握的技术水平有限，可能会存在不少知识理解不够深入或全面，望大家指出问题共同交流，在后续工作及学习中如发现本文内容与实际情况有所偏差，将会完善该博文内容。

    本文为我编写的部署文档（word格式）中关于redis部分的内容复制粘贴而来，因此会存在一些格式问题，因不影响阅读和理解，也没有改的必要了，这样反而便于大家慢下来理解。发表此处，一来是有方便自己查看，二来是给广大网友参考，谢谢大家阅读。

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正文：

Redis配置信息

Redis部署使用两台服务器，实现Redis+keepalived，提供redis服务高可用，当主redis进程或服务器宕机之后，备redis进程或服务器继续提供服务。

服务器配置信息如下所示：

主机名/IP	端口	用途
JZSHPT-APP5/ 10.133.214.15	6379	Redis主服务器-master
JZSHPT-APP6/ 10.133.214.16	6379	Redis从服务器-salve

 

一：Redis主服务器搭建-redis-master

1、安装redis

JZSHPT-APP5:/soft # tar -zxf redis-3.2.1.tar.gz  -C /usr/local

JZSHPT-APP5:/soft # cd /usr/local/redis-3.2.1/

JZSHPT-APP5:/usr/local/redis-3.2.1 # make

JZSHPT-APP5:/usr/local/redis-3.2.1 # cd src &&make install

JZSHPT-APP5:/usr/local # mv /usr/local/redis-3.2.1/ /usr/local/redis

1）redis配置文件修改

JZSHPT-APP5:/usr/local# vim /usr/local/redis/redis.conf

修改文件相关内容为：

#bind 127.0.0.1

protected-mode no

port 6379

daemonizeyes

pidfile/usr/local/redis/redis.pid

logfile"/usr/local/redis/redis.log"

dbfilename dump6379.rdb

dir /usr/local/redis/

2）redis启动脚本编写

JZSHPT-APP5:/usr/local/redis# vim /etc/init.d/redisd

#!/bin/sh

#chkconfig345 86 14

#descriptionStartup and Shutdown script for Redis-3.2.1

progdir=/usr/local/redis/src

progname=redis-server

daemon=$progdir/$progname

config=/usr/local/redis/redis.conf

pidfile=/usr/local/redis/redis.pid

desc="redisdaemon"

scriptname=/etc/init.d/redisd

start()

{

    if test -x $daemon;

    then

    echo -e "Starting$desc:$progname"

        if $daemon $config

        then

            echo -e "Start OK!!!"

        else

             echo -e "Startfailed!!!"

        fi 

    else

    echo -e "Couldn‘t find RedisServer($daemon)"

    fi 

}

 

stop()

{

    if test -e $pidfile;

    then

        echo -e "Stopping$desc:$progname"

        if kill `cat $pidfile`

        then

            echo -e "stop OK!!!"

        else

            echo -e "Stop failed!!!"

        fi

    else

        echo -e "No Redis Server($daemoon)running"

    fi

}

 

restart()

{

    echo -e "Restarting$desc:$progname"

    stop

        start

 

}

 

status()

{

    ps aux | grep $progname

}

 

case$1 in

    start)

        start

    ;;

    stop)

        stop

    ;;

    restart)

restart

    ;;

    status)

    status

    ;;

    *)

    echo"Usage:$scriptnme{start|stop|restart|status}" >&2

    exit 1

    ;;

esac

exit0

 

JZSHPT-APP5:/usr/local/redis #chmod +x /etc/init.d/redisd      

JZSHPT-APP5:/usr/local/redis #chkconfig --add redisd

2、安装Keepalived

安装keepalived前请自行安装解决依赖关系（可能会涉及的软件包为libopenssl-devel、zlib-devel、ipvsadm内核模块等）

JZSHPT-APP5:/soft # tar -zxf keepalived-1.2.23.tar.gz 

JZSHPT-APP5:/soft # cd keepalived-1.2.23/

JZSHPT-APP5:/soft/keepalived-1.2.23 # ./configure--prefix=/usr/local/keepalived/

JZSHPT-APP5:/soft/keepalived-1.2.23 # make &&make install

1）keepalived配置文件编辑

JZSHPT-APP5:~# mkdir -p /etc/keepalived/{scripts,log}

JZSHPT-APP5:~ # vim /usr/local/keepalived/etc/keepalived/

! Configuration File for keepalived

 

 global_defs {

    router_idRedis1_DEVEL

}

 

vrrp_script chk_redis {

         script"/etc/keepalived/scripts/redis_check.sh"

         interval2

         timeout2

         fall 3

}

 

vrrp_instance VI_1 {

     stateMASTER

     interfaceeth0                                         

    virtual_router_id 51

     nopreempt

     priority200

      advert_int5

     authentication {

              auth_typePASS

       auth_pass redis

     }

    virtual_ipaddress {

         10.133.214.50

     }

    track_script {

        chk_redis

    }

       notify_master /etc/keepalived/scripts/redis_master.sh

        notify_backup /etc/keepalived/scripts/redis_backup.sh

         notify_fault  /etc/keepalived/scripts/redis_fault.sh

        notify_stop  /etc/keepalived/scripts/redis_stop.sh

}

2）keepalived启动脚本配置

JZSHPT-APP5:~ # cp /soft/keepalived-1.2.23/keepalived/etc/init.d/keepalived.suse.init/etc/init.d/keepalived.suse

JZSHPT-APP5:~ # cp/usr/local/keepalived/sbin/keepalived /usr/local/sbin/

JZSHPT-APP5:~ # cp /usr/local/keepalived/etc/keepalived/keepalived.conf/etc/keepalived/

3）定义监控脚本

JZSHPT-APP5:~ # vim/etc/keepalived/scripts/redis_check.sh

#!/bin/sh

###/etc/keepalived/scripts/redis_check.sh

ALIVE=`/usr/local/bin/redis-cli PING`

if [ "$ALIVE" == "PONG" ]; then

  echo $ALIVE

  exit 0

else

  echo $ALIVE

  exit 1

fi

4）定义状态切换为master时执行的脚本

JZSHPT-APP5:~ # vim/etc/keepalived/scripts/redis_master.sh

#!/bin/sh

###/etc/keepalived/scripts/redis_master.sh

REDISCLI="redis-cli"

LOGFILE="/etc/keepalived/log/redis-state.log"

pid=$$

echo "`date +‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver]">> $LOGFILE

echo "`date +‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver]Run ‘SLAVEOF 10.133.214.16 6379‘" >> $LOGFILE

$REDISCLI SLAVEOF 10.133.214.16 6379 >>$LOGFILE  2>&1

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver] wait 10 sec for data sync from oldmaster" >> $LOGFILE

sleep 10

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver] data rsync from old mater ok...">> $LOGFILE

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] Run slaveof no one,close master/slave">> $LOGFILE

$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] wait other slave connect....">> $LOGFILE

5）定义状态切换为backups时执行的脚本

JZSHPT-APP5:~ # vim/etc/keepalived/scripts/redis_backup.sh

#!/bin/bash

###/etc/keepalived/scripts/redis_backup.sh

REDISCLI="redis-cli"

LOGFILE="/etc/keepalived/log/redis-state.log"

pid=$$

 

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master]" >> $LOGFILE

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] Being slave state..." >> $LOGFILE2>&1

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] wait 10 sec for data sync from oldmaster" >> $LOGFILE

sleep 10

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] data rsync from old mater ok...">> $LOGFILE

echo "`date +‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver]Run ‘SLAVEOF 10.133.214.16 6379‘" >> $LOGFILE

$REDISCLI SLAVEOF 10.133.214.16 6379 >>$LOGFILE  2>&1

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver] slave connect to 192.18.3.21ok..." >> $LOGFILE

6) 定义状态切换为stop时执行的脚本

JZSHPT-APP5:~ # cp/etc/keepalived/scripts/redis_backup.sh /etc/keepalived/scripts/redis_stop.sh

7) 定义状态切换为fault时执行的脚本

JZSHPT-APP5:~ # cp/etc/keepalived/scripts/redis_backup.sh /etc/keepalived/scripts/redis_fault.sh

3、安装rsyslog实现keepalived日志分离

1）安装rsyslog软件包

JZSHPT-APP5:/soft # rpm -ivhrsyslog-5.10.1-0.7.49.x86_64.rpm

2）修改rsyslog配置文件

JZSHPT-APP5:/soft # vim /etc/rsyslog.conf

140 #*.*;mail.none;news.none                        -/var/log/messages

141 *.*;mail.none;news.none;local0.none                     -/var/log/messages

153 #local0,local1.*                               -/var/log/localmessages

154 local0.*                               -/var/log/keepalived.log

155 local1.*                               -/var/log/localmessages

156 local2,local3.*                         -/var/log/localmessages

157 local4,local5.*                        -/var/log/localmessages

158  cal6,local7.*                        -/var/log/localmessages

3）修改rsyslog启动脚本配置文件

根据/etc/init.d/syslog中的三个启动选项，修改该文件内的”SYSLOG_DAEMON”选项

JZSHPT-APP5:/soft # vim /etc/sysconfig/syslog

40 #SYSLOG_DAEMON="syslog-ng"

41 SYSLOG_DAEMON="rsyslogd"                               

4）修改Keepalived启动脚本选项

JZSHPT-APP5:/soft #  vim /etc/init.d/keepalived.suse

17 DAEMON_OPT="-d "

18 DAEMON_OPT="-d -D -S 0"

5）启动rsyslog服务

JZSHPT-APP5:/soft # /etc/init.d/syslog restart

4、启动Redis和Keepalived

JZSHPT-APP5:~ # /etc/init.d/redisd start

JZSHPT-APP5:~ # /etc/init.d/keepalived.suse start

二：Redis从服务器搭建-redis-slave

1、安装redis

JZSHPT-APP6:/soft # tar -zxf redis-3.2.1.tar.gz  -C /usr/local

JZSHPT-APP6:/soft # cd /usr/local/redis-3.2.1/

JZSHPT-APP6:/usr/local/redis-3.2.1 # make

JZSHPT-APP6:/usr/local/redis-3.2.1 # cd src &&make install

JZSHPT-APP6:/usr/local # mv /usr/local/redis-3.2.1/ /usr/local/redis

1）redis配置文件修改

JZSHPT-APP6:/usr/local# vim /usr/local/redis/redis.conf

修改文件相关内容为：

#bind 127.0.0.1

protected-mode no

port 6379

daemonizeyes

pidfile/usr/local/redis/redis.pid

logfile"/usr/local/redis/redis.log"

dbfilename dump6379.rdb

dir /usr/local/redis/

2）redis启动脚本编写

JZSHPT-APP6:/usr/local/redis# vim /etc/init.d/redisd

#!/bin/sh

#chkconfig345 86 14

#descriptionStartup and Shutdown script for Redis-3.2.1

progdir=/usr/local/redis/src

progname=redis-server

daemon=$progdir/$progname

config=/usr/local/redis/redis.conf

pidfile=/usr/local/redis/redis.pid

desc="redisdaemon"

scriptname=/etc/init.d/redisd

start()

{

    if test -x $daemon;

    then

    echo -e "Starting$desc:$progname"

        if $daemon $config

        then

            echo -e "Start OK!!!"

       else

             echo -e "Startfailed!!!"

        fi 

    else

    echo -e "Couldn‘t find RedisServer($daemon)"

    fi 

}

 

stop()

{

    if test -e $pidfile;

    then

        echo -e "Stopping$desc:$progname"

        if kill `cat $pidfile`

        then

            echo -e "stop OK!!!"

        else

            echo -e "Stop failed!!!"

        fi

    else

        echo -e "No Redis Server($daemoon)running"

    fi

}

 

restart()

{

    echo -e "Restarting$desc:$progname"

    stop

        start

 

}

 

status()

{

    ps aux | grep $progname

}

 

case$1 in

    start)

        start

    ;;

    stop)

        stop

    ;;

    restart)

restart

    ;;

    status)

    status

    ;;

    *)

    echo"Usage:$scriptnme{start|stop|restart|status}" >&2

    exit 1

    ;;

esac

exit0

 

JZSHPT-APP6:/usr/local/redis #chmod +x /etc/init.d/redisd      

JZSHPT-APP6:/usr/local/redis #chkconfig --add redisd

2、安装Keepalived

安装keepalived前请自行安装解决依赖关系（可能会涉及的软件包为libopenssl-devel、zlib-devel、ipvsadm内核模块等）

JZSHPT-APP6:/soft # tar -zxf keepalived-1.2.23.tar.gz 

JZSHPT-APP6:/soft # cd keepalived-1.2.23/

JZSHPT-APP6:/soft/keepalived-1.2.23 # ./configure--prefix=/usr/local/keepalived/

JZSHPT-APP6:/soft/keepalived-1.2.23 # make &&make install

1）keepalived配置文件编辑

JZSHPT-APP6:~ # mkdir -p /etc/keepalived/{scripts,log}

JZSHPT-APP6:~ # vim /usr/local/keepalived/etc/keepalived/

! Configuration File for keepalived

 

 global_defs {

    router_idRedis2_DEVEL

}

 

vrrp_script chk_redis {

         script"/etc/keepalived/scripts/redis_check.sh"

         interval 2

         timeout2

         fall 3

}

 

vrrp_instance VI_1 {

     state BACKUP

     interfaceeth0                                         

    virtual_router_id 51

     priority200

      advert_int5

     authentication {

              auth_typePASS

       auth_pass redis

     }

     virtual_ipaddress{

         10.133.214.50

     }

    track_script {

        chk_redis

    }

       notify_master /etc/keepalived/scripts/redis_master.sh

        notify_backup /etc/keepalived/scripts/redis_backup.sh

        notify_fault  /etc/keepalived/scripts/redis_fault.sh

        notify_stop  /etc/keepalived/scripts/redis_stop.sh

}

2）keepalived启动脚本配置

JZSHPT-APP6:~ # cp /soft/keepalived-1.2.23/keepalived/etc/init.d/keepalived.suse.init/etc/init.d/keepalived.suse

JZSHPT-APP6:~ # cp /usr/local/keepalived/sbin/keepalived/usr/local/sbin/

JZSHPT-APP6:~ # cp/usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/

3）定义监控脚本

JZSHPT-APP6:~ # vim/etc/keepalived/scripts/redis_check.sh

#!/bin/sh

###/etc/keepalived/scripts/redis_check.sh

ALIVE=`/usr/local/bin/redis-cli PING`

if [ "$ALIVE" == "PONG" ]; then

  echo $ALIVE

  exit 0

else

  echo $ALIVE

  exit 1

fi

4）定义状态切换为master时执行的脚本

JZSHPT-APP6:~ # vim/etc/keepalived/scripts/redis_master.sh

#!/bin/sh

###/etc/keepalived/scripts/redis_master.sh

REDISCLI="redis-cli"

LOGFILE="/etc/keepalived/log/redis-state.log"

pid=$$

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver]" >> $LOGFILE

echo "`date +‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver]Run ‘SLAVEOF 10.133.214.15 6379‘" >> $LOGFILE

$REDISCLI SLAVEOF 10.133.214.15 6379 >>$LOGFILE  2>&1

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver] wait 10 sec for data sync from oldmaster" >> $LOGFILE

sleep 10

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver] data rsync from old mater ok...">> $LOGFILE

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] Run slaveof no one,closemaster/slave" >> $LOGFILE

$REDISCLI SLAVEOF NO ONE >> $LOGFILE 2>&1

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] wait other slave connect....">> $LOGFILE

5）定义状态切换为backups时执行的脚本

JZSHPT-APP6:~ # vim/etc/keepalived/scripts/redis_backup.sh

#!/bin/bash

###/etc/keepalived/scripts/redis_backup.sh

REDISCLI="redis-cli"

LOGFILE="/etc/keepalived/log/redis-state.log"

pid=$$

 

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master]" >> $LOGFILE

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] Being slave state..." >>$LOGFILE 2>&1

echo "`date+‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master] wait 10 sec for data sync from oldmaster" >> $LOGFILE

sleep 10

echo "`date +‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[master]data rsync from old mater ok..." >> $LOGFILE

echo "`date +‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver]Run ‘SLAVEOF 10.133.214.15 6379‘" >> $LOGFILE

$REDISCLI SLAVEOF 10.133.214.15 6379 >>$LOGFILE  2>&1

echo "`date +‘%Y-%m-%d:%H:%M:%S‘`|$pid|state:[slaver]slave connect to 10.133.214.15 ok..." >> $LOGFILE

6) 定义状态切换为stop时执行的脚本

JZSHPT-APP6:~ # cp/etc/keepalived/scripts/redis_backup.sh /etc/keepalived/scripts/redis_stop.sh

7) 定义状态切换为fault时执行的脚本

JZSHPT-APP6:~ # cp /etc/keepalived/scripts/redis_backup.sh/etc/keepalived/scripts/redis_fault.sh

3、安装rsyslog实现keepalived日志分离

1）安装rsyslog软件包

JZSHPT-APP5:/soft # rpm -ivhrsyslog-5.10.1-0.7.49.x86_64.rpm

2）修改rsyslog配置文件

JZSHPT-APP5:/soft # vim /etc/rsyslog.conf

140 #*.*;mail.none;news.none                        -/var/log/messages

141 *.*;mail.none;news.none;local0.none                     -/var/log/messages

153 #local0,local1.*                               -/var/log/localmessages

154 local0.*                               -/var/log/keepalived.log

155 local1.*                               -/var/log/localmessages

156 local2,local3.*                        -/var/log/localmessages

157 local4,local5.*                        -/var/log/localmessages

159  cal6,local7.*                         -/var/log/localmessages

3）修改rsyslog启动脚本配置文件

根据/etc/init.d/syslog中的三个启动选项，修改该文件内的”SYSLOG_DAEMON”选项

JZSHPT-APP5:/soft # vim /etc/sysconfig/syslog

40 #SYSLOG_DAEMON="syslog-ng"

41 SYSLOG_DAEMON="rsyslogd"                               

4）修改Keepalived启动脚本选项

JZSHPT-APP5:/soft #  vim /etc/init.d/keepalived.suse

17 DAEMON_OPT="-d "

18 DAEMON_OPT="-d -D -S 0"

5）启动rsyslog服务

JZSHPT-APP5:/soft # /etc/init.d/syslog restart

4、启动Redis和Keepalived

JZSHPT-APP6:~ # /etc/init.d/redisd start

JZSHPT-APP6:~ # /etc/init.d/keepalived.suse start

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结尾：

     感谢阅读，祝有收获的一天，谢谢！

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