keepalived enable Redis Master and standby switching

Test target:

1 : Master Redis When a failure occurs, the Redis Auto Switch main Redis .

2 : Master Redis when it returns to normal, it is automatically downgraded to Redis .

Test environment:

Master redis:192.168.189.138

from redis:192.168.189.131

VIP : 192.168.189.123

Master Redis are installed with keepalived with the Redis , Redis The master/slave is configured. Redis Port 44444.

1 : Production Redis Monitoring and primary standby switch scripts:

Redis Monitoring scripts: (Monitoring Redis is normal)

# Cat/usr/local/scripts/redis_monitor.sh#!/bin/bash alive=$ (/home/usr/local/redis/bin/redis-cli-h 192.168.189.138 -P 44444 PING) if ["$ALIVE" = = "PONG"]; Thenecho $ALIVEexit 0elseecho $ALIVEkillall-9 keepalivedservice network Restartexit 1FI

redis_master script :(for switching from Redis to master redis)

# cat /usr/local/scripts/redis_master.sh#!/bin/bashrediscli= "/home/usr/local/redis/bin/redis-cli-h  192.168.189.138 -p 44444  "logfile="/home/usr/local/redis/var/keepalived-redis-state.log " echo  "[Master]"  >> $LOGFILEdate  >>  $LOGFILEecho   "Being master ..." >>  $LOGFILE  2>&1echo  "run slaveof cmd&nbsp ..." >>  $LOGFILE # Specify yourself as a 131 slave$rediscli slaveof 192.168.189.13144444 >>  $LOGFILE   2> &1# delay of 10 seconds for data synchronization sleep 10                                        echo  "Run slaveof no one cmd ..."  >>  $LOGFILE # Lift Your slave state and become master$rediscli slaveof no one >>$ Logfile 2>&1

Redis_backup script: (For the main Redis switch from Redis )

# cat/usr/local/scripts/redis_backup.sh#!/bin/bashrediscli= "/home/usr/local/redis/bin/redis-cli-h 192.168.189.138-p 44444 "logfile="/home/usr/local/redis/var/keepalived-redis-state.log "echo" [Backup] ">>$ Logfiledate >> $LOGFILEecho "Being slave ..." >> $LOGFILE 2>&1sleep 15echo "Run slaveof cmd ..." >> ; $LOGFILE $rediscli slaveof 192.168.189.13144444 >> $LOGFILE 2>&1

The above is the main Redis on the script, from Redis as soon as you change the script in the corresponding IP .

2 : Configure keepalived

Master node:

# cat /usr/local/keepalived/etc/keepalived/keepalived.confglobal_defs { router_id lvs _devel}vrrp_script redis_monitor {                 ------Monitoring Script  script "/usr/local/scripts/redis_monitor.sh"  interval 2   weight 2 }vrrp_instance VI_1{  state BACKUP                      -------- The state is consistent with the standby node and is backup interface eth0 virtual_router_id 51  mcast_src_ip  192.168.189.138 nopreempt                       ----------settings do not preempt ip priority 100                    -------- --Priority  ADVERT_INT&NBSp;1 authentication { auth_type pass auth_pass password_123} track_script  { redis_monitor                    -------Consistent} virtual_ipaddress { 192.168.189.123&nbsp with the above monitoring script;}  notify_master/usr/local/scripts/redis_master.sh   -------keepalived run when switching to master   notify_backup/usr/local/scripts/redis_backup.sh   -------keepalived run when switching to slave}

from node:

# cat /usr/local/keepalived/etc/keepalived/keepalived.conf! configuration file for  keepalived global_defs { router_id LVS_DEVEL}vrrp_script redis_monitor{  Script "/usr/local/scripts/redis_monitor.sh"  interval 2  weight 2 } vrrp_ instance vi_1{  state backup                      ----------consistent with the primary node,bakcup interface  eth0 virtual_router_id 51  mcast_src_ip 192.168.189.131 priority 99                       -----Priority is less than the primary node  advert_int 1  authentication { auth_type pass  auth_pass password_123} track_script { redis_monitor } virtual_ipaddress  { 192.168.189.123&nBSP;} NOTIFY_MASTER/USR/LOCAL/SCRIPTS/REDIS_MASTER.SHNOTIFY_BACKUP/USR/LOCAL/SCRIPTS/REDIS_BACKUP.SH}

3 : Open Redis with the keepalived

#/usr/local/redis/bin/redis-server/home/usr/local/redis/etc/redis.conf#/usr/local/keepalived/sbin/keepalived-d -f/usr/local/keepalived/etc/keepalived/keepalived.conf

4 : Observation Test

After you start redis-server , you can see that The 138 host preempted the VIP123 and Redis role is Master

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650) this.width=650; "src=" Http://s2.51cto.com/wyfs02/M00/83/2D/wKioL1dsnzfQB7bfAAAbr--Osl4448.png "style=" float: none; "title=" 2.png "alt=" Wkiol1dsnzfqb7bfaaabr--osl4448.png "/>

131 the mainframe didn't preempt it. 123IP , Redis role is Slave

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Configure data on the master node to see if the slave node is synchronized.

Main:

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From:

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The above can be seen that the primary and standby data synchronization is normal.

1, Close the main Redis to see if the slave node is preempted IP , from Redis whether it becomes the primary Redis

#/home/usr/local/redis/bin/redis-cli-h 192.168.189.138-p 44444 shutdown

View Log from node:

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The above log shows that the 131 node is preempted to IP123and becomes the keepalived master node.

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The above log shows that the redis role of the 131 node becomes Master.

to view the status of 131redis characters:

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131 of the Redis has succeeded from slave into Master .

 2, restore 138 status , redis is automatically demoted to slave

re-open keepalived, and Redison the master node (note to turn on redisfirst, then turn on keepalived).

#/home/usr/local/redis/bin/redis-server/home/usr/local/redis/etc/redis.conf#/usr/local/keepalived/sbin/ Keepalived-d-f/usr/local/keepalived/etc/keepalived/keepalived.conf

to view the 138 node log:

650) this.width=650; "src=" Http://s5.51cto.com/wyfs02/M02/83/2D/wKioL1dsoTOAUvHAAAC9Odo-qh4584.png "title=" 9.png " alt= "Wkiol1dsotoauvhaaac9odo-qh4584.png"/> can see keepalived Primary node automatically enters BACKUP state, not preempted 123VIP .

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The Redis role is also automatically changed to Slave.

To view the primary and standby Redis role:

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Test Target completed!

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keepalived enable Redis Master and standby switching