基于Keepalived对Redis做高可用配置
功能 ip地址 安装软件主redis 10.13.6.13 redis，keepalived
从redis 10.13.6.16 redis，keepalived
VIP 10.13.6.17
一、redis主从搭建
1.redis安装
本文通过yum源的安装方式来安装（需要配置epel源），也可以通过源码编译的方式来安装
[root@P2Pp_Red01 ~]# yum install -y redis
[root@P2Pp_Red02 ~]# yum install -y redis
2.修改配置文件
①、主redis需要修改的文件及内容
[root@P2Pp_Red01 ~]# vi /etc/redis.conf
bind 0.0.0.0
其余都可以安装默认状态
②、从redis需要修改的文件及内容
[root@P2Pp_Red02 ~]# vi /etc/redis.conf
bind 0.0.0.0
slaveof 10.13.6.13 6379 //指定主redis的地址与端口
3.查看主从状态
[root@P2Pp_Red01 ~]# redis-cli INFO |grep role -A 3
role:master
slave0:10.13.6.16,45270,online
db0:keys=6,expires=0
[root@P2Pp_Red02 ~]# redis-cli INFO |grep role -A 3
role:slave
master_host:10.13.6.13
master_port:6379
master_link_status:up
二、使用keepalived对redis做高可用
1.安装keepalived，两台机器都需要安装
[root@P2Pp_Red01 ~]# yum install -y keepalived
[root@P2Pp_Red02 ~]# yum install -y keepalived
2.准备配置文件
①、主redis的配置文件,关于各行代表的意思，请移步我的另外一篇文档，链接见文章开头
[root@P2Pp_Red01 scripts]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 10.13.4.17
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_redis {
script "killall -0 redis-server"
interval 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 100
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.13.6.17
}
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
}
~[root@P2Pp_Red01 ~]# vi /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
REDISCLI="/usr/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 10.13.4.13 6379 >> $LOGFILE 2>&1
sleep 10
#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 SLAVEOF NO ONE >> $LOGFILE 2>&1
~
[root@P2Pp_Red01 ~]# vi /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
REDISCLI="/usr/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being slave...." >> $LOGFILE 2>&1
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 "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 10.13.4.13 6379 >> $LOGFILE 2>&1
[root@P2Pp_Red01 scripts]# vi /etc/keepalived/scripts/redis_stop.sh
#!/bin/bash
LOGFILE=/var/log/keepalived-redis-state.log
echo "[stop]" >> $LOGFILE
date >> $LOGFILE
[root@P2Pp_Red01 scripts]# vi /etc/keepalived/scripts/redis_fault.sh
#!/bin/bash
GFILE=/var/log/keepalived-redis-state.log
echo "[fault]" >> $LOGFILE
date >> $LOGFILE
~
②、准备从redis的配置文件
[root@P2Pp_Red02 ~]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 10.13.4.13
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_script chk_redis {
script "killall -0 redis-server"
interval 1
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 100
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
10.13.6.17
}
#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
[root@P2Pp_Red02 ~]# vi /etc/keepalived/scripts/redis_master.sh
#!/bin/bash
REDISCLI="/usr/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Being master...." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 10.13.6.13 6379 >> $LOGFILE 2>&1
sleep 10
#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 SLAVEOF NO ONE >> $LOGFILE 2>&1
~
[root@P2Pp_Red02 ~]# vi /etc/keepalived/scripts/redis_backup.sh
#!/bin/bash
REDISCLI="/usr/bin/redis-cli"
LOGFILE="/var/log/keepalived-redis-state.log"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Being slave....
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 "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI SLAVEOF 10.13.6.13 6379 >> $LOGFILE 2>&1
其余的两个文件跟主redis是一样的
本处将不再给模拟故障，但是测试时通过的，现在已经在生产环境中使用