Redis High-availability installation notes under CentOS

(WJW) Redis High-Availability installation notes[x] Introduction to the installation environment:

Master:t1
Slave:t2
vip:192.168.68.45

[x] Installing Redis (master,slave)

Note: modifications to the Flushall before installing Redis

Find src/redis.c files, put

' {"Flushdb", flushdbcommand,1, "W", 0,null,0,0,0,0,0}, '   {"Flushall", flushallcommand,1, "W", 0,null,0,0,0,0,0}, `

Modified to:

' {' Xflushdb ', flushdbcommand,1, ' W ', 0,null,0,0,0,0,0}, '   {' Xflushall ', flushallcommand,1, ' W ', 0,null,0,0,0,0,0 },`

vi/etc/sysctl.conf Add a line: ' Vm.overcommit_memory=1 ' Mkdir/opt/redismkdir/opt/redis/logmkdir/opt/redis/dbtar zxvf. REDIS-2.8.17.TAR.GZCD redis-2.8.17make Prefix=/opt/redis Install

[x] Redis startup script (Master,slave):/opt/redis/bin/startredis.sh

#!/bin/bashbasedir= ' dirname $ ' echo ' Redis BASE DIR: $basedir ' CD $basedirnohup./redis-server./redis.conf >/dev/ Null 2>&1 &

[x] redis Stop script (master,slave):/opt/redis/bin/stopredis.sh

#!/bin/shbasedir= ' dirname $ ' echo ' Redis BASE DIR: $basedir ' CD $basedir./redis-cli-h localhost-a 123456 shutdown

[x] Redis configuration file (master,slave):/opt/redis/bin/redis.conf

#requirepass 123456pidfile/opt/redis/bin/redis.pidlogfile/opt/redis/log/redis.logdir/opt/redis/db/daemonize Yesport 6379timeout 300loglevel warningdatabases 16maxmemory 1g# do not snapshot #save 1#save y 10#save Es#dbfilename dump.rdb# using aofappendonly yesappendfsync everysec

[x] Install keepalived (master,slave):

#wget Http://www.keepalived.org/software/keepalived-1.2.13.tar.gztar zxvf keepalived-1.2.13.tar.gzcd. Keepalived-1.2.13./configuremake make installcp/usr/local/etc/rc.d/init.d/keepalived/etc/rc.d/init.d/cp/usr/ local/etc/sysconfig/keepalived/etc/sysconfig/cp/usr/local/sbin/keepalived/usr/sbin/mkdir/etc/keepalivedcp/usr/ Local/etc/keepalived/keepalived.conf/etc/keepalived/chkconfig--add keepalived#chkconfig--level keepalived on# Service keepalived Start

[x] notify_* explanation

Keepalived is called when the state is converted: when it enters the master state, it calls Notify_master when it enters the backup state and calls Notify_backup when an abnormal condition is found (track_script,track_ Interface failed) Enter fault status call Notify_fault call Notify_stop when keepalived program terminates

[x] Create the following configuration file on master:

vim /etc/keepalived/keepalived.conf

! Configuration File for Keepalivedglobal_defs {notification_email {[email protected]} Notification_email_ From [email protected] smtp_server localhost smtp_connect_timeout router_id lvs_redis}vrrp_script Chk_redis {Script "/etc/keepalived/scripts/redis_check.sh" # # #监控脚本 interval 2 # # #监控时间}VR Rp_instance vi_1 {nopreempt # # #不抢占 to prevent brain fissure state MASTER #备的是BACKUP interface Br0 virtual_router_id 5    1 priority #备的是90 Advert_int 1 Authentication {auth_type PASS auth_pass Redis} virtual_ipaddress {192.168.68.45} track_script {Chk_redis # # #执行上面定义的chk_redi    s} 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}

[x] Create the following configuration file on slave:

vim /etc/keepalived/keepalived.conf

! Configuration File for Keepalivedglobal_defs {notification_email {[email protected]} Notification_email_ From [email protected] smtp_server localhost smtp_connect_timeout router_id lvs_redis}vrrp_script Chk_redis {Script "/etc/keepalived/scripts/redis_check.sh" # # #监控脚本 interval 2 # # #监控时间}VR Rp_instance vi_1 {nopreempt # # #不抢占 to prevent brain fissure state BACKUP #备的是BACKUP interface Br0 virtual_router_id 5    1 priority #备的是90 Advert_int 1 Authentication {auth_type PASS auth_pass Redis}     virtual_ipaddress {192.168.68.45} track_script {Chk_redis # # #执行上面定义的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}

[x] Create a script to monitor Redis on master and slave:

mkdir /etc/keepalived/scripts/
vi /etc/keepalived/scripts/redis_check.sh

#!/bin/bashc_date= ' DATE + ' [%y-%m-%d%h:%m:%s] "' alive= '/opt/redis/bin/redis-cli PING ' if [" $ALIVE "= =" PONG "]; Then  echo "${c_date} $ALIVE"  exit 0else  echo "${c_date} $ALIVE"  exit 1fi

[x] Create the following script in master and slave notify_faultAnd notify_stop：

vim /etc/keepalived/scripts/redis_fault.sh

#!/bin/bashc_date= ' DATE + ' [%y-%m-%d%h:%m:%s] "' Logfile=/var/log/keepalived-redis-state.logecho" ${C_DATE} [Fault] " >> $LOGFILE

vim /etc/keepalived/scripts/redis_stop.sh

#!/bin/bashc_date= ' DATE + ' [%y-%m-%d%h:%m:%s] ' Logfile=/var/log/keepalived-redis-state.logecho ' ${C_DATE} [Stop] " >> $LOGFILE

[x] created on master notity_masterAnd notify_backupScript:

vim /etc/keepalived/scripts/redis_master.sh

#!/bin/bashc_date= ' DATE + ' [%y-%m-%d%h:%m:%s] "' rediscli="/opt/redis/bin/redis-cli "logfile="/var/log/ Keepalived-redis-state.log "echo" ${c_date} [Master] ">> $LOGFILE # when keepalived is configured as preemptive, open the following comment #echo" Being Master: ">> $LOGFILE 2>&1#echo" Run slaveof cmd ... ">> $LOGFILE # $REDISCLI slaveof T2 6379 >> $LOGFILE  2>&1#sleep #延迟10秒以后待数据同步完成后再取消同步状态echo "Run slaveof NO one cmd ..." >> $LOGFILE $rediscli SLA veof NO one >> $LOGFILE 2>&1

vim /etc/keepalived/scripts/redis_backup.sh

#!/bin/bashc_date= ' DATE + ' [%y-%m-%d%h:%m:%s] "' rediscli="/opt/redis/bin/redis-cli "logfile="/var/log/ Keepalived-redis-state.log "echo" ${c_date} [Backup] >> $LOGFILE # When keepalived is configured as preemptive, open the comment below #echo "Being slave ">> $LOGFILE 2>&1#sleep #延迟15秒待数据被对方同步完成之后再切换主从角色echo" Run slaveof cmd ... ">> $LOGFILE $redisc LI slaveof T2 6379 >> $LOGFILE  2>&1

[x] created on slave notity_masterAnd notify_backupScript:

vim /etc/keepalived/scripts/redis_master.sh

#!/bin/bashc_date= ' DATE + ' [%y-%m-%d%h:%m:%s] "' rediscli="/opt/redis/bin/redis-cli "logfile="/var/log/ Keepalived-redis-state.log "echo" ${c_date} [Master] ">> $LOGFILE # when keepalived is configured as preemptive, open the following comment #echo" Being Master: ">> $LOGFILE 2>&1#echo" Run slaveof cmd ... ">> $LOGFILE # $REDISCLI slaveof T1 6379 >> $LOGFILE  2>&1#sleep #延迟10秒以后待数据同步完成后再取消同步状态echo "Run slaveof NO one cmd ..." >> $LOGFILE $rediscli SLA veof NO one >> $LOGFILE 2>&1

vim /etc/keepalived/scripts/redis_backup.sh

#!/bin/bashc_date= ' DATE + ' [%y-%m-%d%h:%m:%s] "' rediscli="/opt/redis/bin/redis-cli "logfile="/var/log/ Keepalived-redis-state.log "echo" ${c_date} [Backup] >> $LOGFILE # When keepalived is configured as preemptive, open the comment below #echo "Being slave ">> $LOGFILE 2>&1#sleep #延迟15秒待数据被对方同步完成之后再切换主从角色echo" Run slaveof cmd ... ">> $LOGFILE $redisc LI slaveof T1 6379 >> $LOGFILE  2>&1

[x] on Master and slave, add executable permissions to the monitoring script:

chmod +x /etc/keepalived/scripts/*.sh

[x] Start step:

1. To start Redis on master
   /opt/redis/bin/startRedis.sh

2. Start Redis on the slave
   /opt/redis/bin/startRedis.sh

3. Start the keepalived on master
   service keepalived start

4. Start the keepalived on the slave
   service keepalived start

Redis High-availability installation notes under CentOS