mysql + keepalived 双主高可用
Mysql + keepalived双主高可用集群
环境：centos6.4 两台
服务器1：192.168.92.128
服务器2：192.168.92.130
Mysql5.5
关闭防火墙
service iptables stop
Chkconfig iptables off
Setenforce 0
修改/etc/selinux/config
将SELINUX=enforcing改为SELINUX=disabled
两台同时创建mysql用户
groupadd mysql
groupadd mysqluseradd -s /sbin/nologin -g mysql -M mysql
在这里采用的是mysql二进制源码包
直接解压就行，不用编译安装
替换/etc/my.cnf文件
建立mysql数据文件目录
chown -R mysql.mysql /usr/local/mysql
/bin/cp support-files/my-small.cnf /etc/my.cnf
mkdir -p /usr/local/mysql/data
安装mysql依赖包libaio-devel
yum -y install libaio-devel
初始化
mysql/usr/local/mysql/scripts/mysql_install_db --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data --user=mysql
拷贝mysql启动脚本
cp support-files/mysql.server /etc/init.d/mysqld
chmod +x /etc/init.d/mysqld
设置mysql开机启动
把/etc/init.d/mysqld start 命令放到/etc/rc.local文件里
设置mysql环境变量
vim /etc/profile
添加export PATH=$PATH:/usr/local/mysql/bin
运行source /etc/profile
设置mysql数据库root的登录密码
mysqladmin -u root password 'admin'
修改两台的mysql配置文件/etc/my.cnf
两台的mysql均要开启binlog日志功能
把其中一台配置文件里的server-id = 1改为server-id = 2
Master1配置
log-bin = mysql-bin
binlog_format = mixed
server-id = 1
relay-log = relay-bin
relay-log-index = slave-relay-bin.index
auto-increment-increment = 2
auto-increment-offset = 1
重启mysql
Service mysqld restart
Master2配置
log-bin = mysql-bin
binlog_format = mixed
server-id = 2
relay-log = relay-bin
relay-log-index = slave-relay-bin.index
auto-increment-increment = 2
auto-increment-offset = 2
重启mysql
Service mysqld restart
在192.168.92.128服务器新建一个用户赋予“REPLICATION SLAVE”的权限
GRANT REPLICATION SLAVE ON *.* TO 'replication'@'192.168.92.130' IDENTIFIED BY 'replication';
刷新权限
flush privileges;
查看下log bin日志和pos值位置
Show master status;
mysql> change master to
-> master_host='192.168.92.130',
-> master_user='replication',
-> master_password='replication',
-> master_log_file='mysql-bin.000003',
-> master_log_pos=107;对端状态显示值
如果这里执行失败可以退出mysql
在/usr/local/mysql/data/下有两个文件可能被占用
relay-log.info
master.info
把这两个文件删除
重新进入mysql执行
执行完后启动
start slave;
show slave status\G
查看IO和SQL
出现两个YES成功
做下测试
在master1创建表用户
在master2查看数据同步过来没有
然后两台安装keepalived
Yum -y install keeplived
添加系统服务
chkconfig keepalived --add
chkconfig keepalived on
然后编辑两台keepalived配置
vim /etc/keepalived/keepalived.conf
修改IP smtp_server 127.0.0.1
标识，双主相同 mysql_ha
两台都是BACKUP
两个服务器id相同
id主的100，从的低于100就行
VIP两台相同
检测本地mysql，backup也要写检测
当mysq服down时，执行此脚本，杀死keepalived
vim /etc/keepalived/mysql.sh
编辑
#!/bin/bash
pkill keepalived
提升权限
chmod +x /etc/keepalived/mysql.sh
做下测试
停掉主服务192.168.92.128这台mysql服务
Service mysqld stop
看VIP还在这台服务器上没
然后查看下192.168.92.130这台服务的IP
