keepalived + redis 主备容灾部署
方案图
现网环境中有两个数据库主机,master, 和slave。以及一个vip
Master: 192.168.11.149
Slave:192.168.11.150
Vip:192.168.200.200
节点A Redis-Master 主节点,节点B Redis-Slave 备用节点,虚拟IP是对外提供访问的IP。虚拟IP在某个时刻只能属于某一个节点,另一个节点作为备用节点存在。当主节点不可用时,备用节点接管虚拟IP,提供正常服务。
安装redis
redis master安装
下载redis-3.0.3.tar.gz 创建redis 账户
#useradd -d /home/cin_redis –s /bin/bash –m cin_redis
# passwd cin_redis
上传redis-3.0.3.tar.gz 解压
# tar –xzvf redis-3.0.3.tar.gz
#cd rediis-3.0.3/src
#mak MALLOC=libc
#make PREFIX=$HOME install
在redis的解压目录下有一个redis.conf 文件,编辑redis.conf文件
daemonize yes 后台模式运行
port 15093 端口
logfile “/home/cin_redis/redis-15093.log”
pidfile “/home/cin_redis/redis-15093.pid”
可以把该配置文件拷贝到bin目录下修改;启动redis
# redis-server redis.conf
redis slave 安装
redis slave机器上同样安装redis 数据库,安装步骤同2.1安装,修改redis.conf 文件
daemonize yes 后台模式运行
port 15093 端口
logfile “/home/cin_redis/redis-15093.log”
pidfile “/home/cin_redis/redis-15093.pid”
slaveof 192.168.11.149 15093
可以把该配置文件拷贝到bin目录下修改;启动redis
#redis-server redis.conf
用redis-cli 客户端连接redis-master数据库,查看replication
用redis-cli客户端连接redis-slave数据库,查看replication
安装keepalived
下载keepalived-1.2.23(https://codeload.github.com/acassen/keepalived/tar.gz/v1.2.23) 创建keepalived 账户
#useradd –m keepalived –d /home/keepalived –s /bin/bash
#passwd keepalived
上传keepalived-1.2.23.tar.gz
#tar –xzvf keepalived-1.2.23.tar.gz
#cd keepalived-1.2.23
#./configure –prefix=$HOME/keepalive
# make &make install
# cp -r /home/keepalived/keepalive/etc/keepalived /etc
# cp /home/keepalived/keepalive/etc/rc.d/init.d/keepalived /etc/rc.d/init.d
#cp /home/keepalived/keepalive/etc/sysconfig/keepalived /etc/sysconfig
#ln –s /home/keepalived/keepalive/sbin/keepalived /usr/sbin/
#chkconfig –add keepalived
按照以上步骤分别在redis-master 和 redis-slave 主机上安装keepalived工具
配置keepalived
redis master 配置
按照上面的步骤安装完keepalived,vim 打开/etc/keepalived下面的keepalived.conf 文件配置
! Configuration File for keepalived
vrrp_script chk_redis {
script "/etc/keepalived/scripts/redis_check.sh"
interval 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.200.200
}
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"
}
在/etc/keepalived 目录下创建scripts,
#cd /etc/keepalived/scripts
#touch redis_master.sh
#touch redis_backup.sh
#touch redis_fault.sh]
#touch redis_stop.sh
#touch redis_check.sh
redis_master.sh : 当keepalived切换成master时,会触发执行此脚本
redis_backuo.sh : 当keepalived 切换成slave时,会触发执行此脚本
redis_fault.sh : 当keepalived 出错时,会触发执行此脚本
redis_stop.sh : 当keepalived 停止时,会触发执行次脚本
redis_check.sh : keepalived定时调用此脚本检测redis 数据库是否连接正常
redis_master.sh文件内容:
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Beging master..." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF NO ONE cmd..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF NO ONE >> $LOGFILE 2>&1
redis_backup.sh文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 15
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PROT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
redis_fault.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"
echo "[ERROR]-----keepalived is fault,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
redis_stop.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"
echo "[ERROR]-----keepalived is stop,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
redis_check.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.149"
REMOTEIP="192.168.11.150"
PORT="15093"
ALIVE=`$REDISCLI -h $LOCALIP -p $PORT PING`
if [ "$ALIVE" == "PONG" ];then
echo "[INFO] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is health." >> $LOGFILE
exit 0
else
service keepalived stop
echo "[ERROR] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is not health." >> $LOGFILE
exit 1
fi
redis slave 配置
按照上面的步骤安装完keepalived,vim 打开/etc/keepalived下面的keepalived.conf 文件配置
! Configuration File for keepalived
vrrp_script chk_redis {
script "/etc/keepalived/scripts/redis_check.sh"
interval 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.200.200
}
track_script {
chk_redis
}
notify_master /etc/keepalived/scripts/redis_master.sh
notify_backup /etc/keepalived/scripts/redis_backup.sh
notify_fault /etc/keepalived/scripts/redis_fault.sh
notify_stop /etc/keepalived/scripts/redis_stop.sh
}
在/etc/keepalived 目录下创建scripts,
#cd /etc/keepalived/scripts
#touch redis_master.sh
#touch redis_backup.sh
#touch redis_fault.sh
#touch redis_stop.sh
#touch redis_check.sh
redis_master.sh : 当keepalived切换成master时,会触发执行此脚本
redis_backuo.sh : 当keepalived 切换成slave时,会触发执行此脚本
redis_fault.sh : 当keepalived 出错时,会触发执行此脚本
redis_stop.sh : 当keepalived 停止时,会触发执行次脚本
redis_check.sh : keepalived定时调用此脚本检测redis 数据库是否连接正常
redis_master.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"
echo "[master]" >> $LOGFILE
date >> $LOGFILE
echo "Beging master..." >> $LOGFILE 2>&1
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF NO ONE cmd..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF NO ONE >> $LOGFILE 2>&1
redis_backup.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"
echo "[backup]" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 15
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
redis_fault.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"
echo "[ERROR]-----keepalived is fault,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
redis_stop.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"
echo "[ERROR]-----keepalived is stop,change local redis to slave-----" >> $LOGFILE
date >> $LOGFILE
echo "Beging slave..." >> $LOGFILE 2>&1
sleep 10
echo "Run SLAVEOF cmd ..." >> $LOGFILE
$REDISCLI -h $LOCALIP -p $PORT SLAVEOF $REMOTEIP $PORT >> $LOGFILE 2>&1
redis_check.sh 文件内容
#!/bin/bash
KPATH=/home/keepalived
RPATH=/home/cin_redis
REDISCLI=$RPATH/bin/redis-cli
LOGFILE=$KPATH/log/keepalived-redis-state.log
LOCALIP="192.168.11.150"
REMOTEIP="192.168.11.149"
PORT="15093"
ALIVE=`$REDISCLI -h $LOCALIP -p $PORT PING`
if [ "$ALIVE" == "PONG" ];then
echo "[INFO] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is health." >> $LOGFILE
exit 0
else
service keepalived stop
echo "[ERROR] `date +'%Y-%m-%d:%H:%M:%S'` :$LOCALIP local redis is not health." >> $LOGFILE
exit 1
fi
转载于:https://my.oschina.net/mjRao/blog/734129