redis+Keepalived主从热备切换实例

 

[root@cache-redis-01~/]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { 11270963592@qq.com } notification_email_from 18978038798@189.cn smtp_server smtp.189.cn smtp_connect_timeout 30 router_id redis_service01 vrrp_skip_check_adv_addr # vrrp_strict # can not use ping vrrp_garp_interval 0 vrrp_gna_interval 0 } vrrp_script chk_redis { script /etc/keepalived/scripts/redis_check.sh ###监控本地redis alive interval 2 ###监控时间间隔（秒） } vrrp_instance redis { state BACKUP interface eth0 virtual_router_id 55 priority 100 nopreempt ###不抢占MASTER advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_redis ###执行上面定义的chk_redis } virtual_ipaddress { 172.16.1.63/24 dev eth0 label eth0:63 } notify_master /etc/keepalived/scripts/redis_master.sh # 当此节点切换为master时执行的脚本 notify_backup "/etc/keepalived/scripts/redis_backup.sh cache-redis-02" # 当此节点切换为 # backup时执行的脚本 notify_fault /etc/keepalived/scripts/redis_fault.sh # 当此节点故障时（chk_keepalive中 # 脚本返回非0）执行的脚本 notify_stop /etc/keepalived/scripts/redis_stop.sh # 当此节点keepalived服务stop时执行的脚本 }

[root@cache-redis-02~/]# cat /etc/keepalived/keepalived.conf ! Configuration File for keepalived global_defs { notification_email { 11270963592@qq.com } notification_email_from 18978038798@189.cn smtp_server smtp.189.cn smtp_connect_timeout 30 router_id redis_service02 vrrp_skip_check_adv_addr # vrrp_strict # can not use ping vrrp_garp_interval 0 vrrp_gna_interval 0 } vrrp_script chk_redis { script /etc/keepalived/scripts/redis_check.sh ###监控本地redis alive interval 2 ###监控时间间隔（秒） } vrrp_instance redis { state BACKUP interface eth0 virtual_router_id 55 priority 50 advert_int 1 authentication { auth_type PASS auth_pass 1111 } track_script { chk_redis ###执行上面定义的chk_redis } virtual_ipaddress { 172.16.1.63/24 dev eth0 label eth0:63 } notify_master /etc/keepalived/scripts/redis_master.sh # 当此节点切换为master时执行的脚本 notify_backup "/etc/keepalived/scripts/redis_backup.sh cache-redis-01" # 当此节点切换为 # backup时执行的脚本 notify_fault /etc/keepalived/scripts/redis_fault.sh # 当此节点故障时（chk_keepalive中 # 脚本返回非0）执行的脚本 notify_stop /etc/keepalived/scripts/redis_stop.sh # 当此节点keepalived服务stop时执行的脚本 }

跟从的脚本完全一样！！！

mkdir -p /etc/keepalived/scripts cat >/etc/keepalived/scripts/redis_master.sh<<-EOF #!/bin/bash PORT="\${1:-6380}" REDISCLI="/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" sleep 10 #延迟10秒待数据被对方同步完成之后再切换主从角色 echo -e "[keepalived master]\t\$(date +%F_%T)\nRun SLAVEOF NO ONE cmd ..." >>\${LOGFILE} \$REDISCLI -h \$(hostname) -p \${PORT} SLAVEOF NO ONE &>>\${LOGFILE} EOF cat >/etc/keepalived/scripts/redis_backup.sh<<-EOF #!/bin/bash REMOTE_HOSTNAME="\$1" PORT="\${2:-6380}" REDISCLI="/bin/redis-cli" LOGFILE="/var/log/keepalived-redis-state.log" sleep 15 #延迟15秒待数据被对方同步完成之后再切换主从角色 echo -e "[keepalived backup]\t\$(date +%F_%T)\nRun SLAVEOF \${REMOTE_HOSTNAME} \${PORT} ..." >>\${LOGFILE} \$REDISCLI -h \$(hostname) -p \${PORT} SLAVEOF \${REMOTE_HOSTNAME} \${PORT} &>>\${LOGFILE} EOF cat >/etc/keepalived/scripts/redis_check.sh<<-EOF #!/bin/bash PORT="\${1:-6380}" LOGFILE=/var/log/keepalived-redis-state.log ALIVE=\$(/bin/redis-cli -h \$(hostname) -p \${PORT} PING) if [ "\$ALIVE" == "PONG" ]; then exit 0 else echo -e "[redis_check fault]\t\$(date +%F_%T)" >> \$LOGFILE exit 1 fi EOF cat >/etc/keepalived/scripts/redis_fault.sh<<-EOF #!/bin/bash systemctl stop keepalived.service EOF cat >/etc/keepalived/scripts/redis_stop.sh<<-EOF #!/bin/bash LOGFILE=/var/log/keepalived-redis-state.log echo -e "[keepalived stop]\t\$(date +%F_%T)" >> \$LOGFILE EOF chmod +x /etc/keepalived/scripts/*.sh