Keepalived+mysql实现高可用
项目环境：VIP 192.168.122.100
mysql1 192.168.122.10
mysql2 192.168.122.20
一、mysql 主主同步 （不使用共享存储，数据保存本地存储）1. mysql1 192.168.122.10:
# vim /etc/my.cnf
log-bin=mysql-bin
server-id= 4
# service mysqld start
# mysql
mysql> reset master;
mysql> grant replication slave, replication client on *.*
-> to admin@'%' identified by '123';
mysql> flush privileges;
mysql> change master to
-> master_host='192.168.122.20',
-> master_user='admin',
-> master_password='123',
-> master_log_file='mysql-bin.000001', //根据个人实际修改
-> master_log_pos=0; //根据个人
Query OK, 0 rows affected (0.02 sec)
mysql> show slave status\G
2. mysql2 192.168.122.20:
# vim /etc/my.cnf
log-bin=mysql-bin
server-id= 251
# service mysqld start
# mysql
mysql> reset master;
mysql> grant replication slave, replication client on *.*
-> to admin@'%' identified by '123';
mysql> flush privileges;
mysql> change master to
-> master_host='192.168.122.10',
-> master_user='admin',
-> master_password='123',
-> master_log_file='mysql-bin.000001',
-> master_log_pos=0;
Query OK, 0 rows affected (0.02 sec)
mysql> show slave status\G
二、安装keepalived
# yum -y install ipvsadm kernel-headers kernel-devel openssl-devel popt-devel
方法一：
源码安装keepalived
# wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz
# tar zxvf keepalived-1.2.2.tar.gz
# cd keepalived-1.2.2
# ./configure --prefix=/ //安装到根下，防止目录太深
# make
# make install
方法二：
# yum -y install keepalived
三、keepalived 主备配置文件
192.168.122.10 Master配置
# vim /etc/keepalived/keepalived.conf
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
! Configuration File for keepalived
global_defs {
router_id mysql1
}
vrrp_script check_run {
script "/root/keepalived_check_mysql.sh"
interval 5
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 88
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass root
}
track_script {
check_run
}
virtual_ipaddress {
192.168.122.100
}
}
192.168.122.20 Slave配置
# vim /etc/keepalived/keepalived.conf
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
! Configuration File for keepalived
global_defs {
router_id mysql2
}
vrrp_script check_run {
script "/root/keepalived_check_mysql.sh"
interval 5
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 88
priority 50
advert_int 1
authentication {
auth_type PASS
auth_pass root
}
track_script {
check_run
}
virtual_ipaddress {
192.168.122.100
}
}
1. 注意空格
2. 日志查看脚本是否被执行
# tail -f /var/log/messages
Jun 19 15:20:19 xen1 Keepalived_vrrp: Using LinkWatch kernel netlink reflector...
Jun 19 15:20:19 xen1 Keepalived_vrrp: VRRP sockpool:
Jun 19 15:20:19 xen1 Keepalived_vrrp: VRRP_Script(check_run) succeeded
四、mysql状态检测脚本/root/bin/keepalived_check_mysql.sh
#vim/root/keepalived_check_mysql.sh
#!/bin/bash
MYSQL=/usr/local/mysql/bin/mysql
MYSQL_HOST=localhost
MYSQL_USER=root //连接mysql的用户名
MYSQL_PASSWORD=root //连接mysql的密码
CHECK_TIME=3
#mysqlis working MYSQL_OK is 1 , mysql down MYSQL_OK is 0
MYSQL_OK=1
check_mysql_helth (){
$MYSQL -h $MYSQL_HOST -u $MYSQL_USER -p${MYSQL_PASSWORD} -e "show status;" &>/dev/null
if [ $? -eq 0 ] ;then
MYSQL_OK=1
else
MYSQL_OK=0
fi
return $MYSQL_OK
}
while [ $CHECK_TIME -ne 0 ]
do
check_mysql_helth
if [ $MYSQL_OK -eq 1 ] ; then
exit 0
fi
let CHECK_TIME--
sleep 1
done
/etc/init.d/keepalived stop
exit 1
# chmod 755 /root/keepalived_check_mysql.sh
两边均启动keepalived
# /etc/init.d/keepalived start
# /etc/init.d/keepalived start
# chkconfig --add keepalived
# chkconfig keepalived on
五、测试及诊断
注 keepalived之间使用vrrp组播方式通信使用的IP地址是224.0.0.18
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