Linux下MySQL+Keepalived高可用性配置

前言*在mysql高可用配置中，我们会看到有很多的方法，每种方法都有各自优缺点,那今天我们来看参看一下Mysql+Keepalived高可用配置。

一、安装环境：

系统版本：CentOS6.0 x86_64

Mysql版本：mysql-5.1.61

Mysqlserver_1: 192.9.117.140

Mysqlserver_2: 192.9.117.141

Keepalived-VIP：192.9.117.142

二、正式安装:

在两台服务器上分别安装mysql，这里直接采用yum安装，如下：

yum install –y  mysql mysql-devel mysql-server mysql-libs

安装完后，配置MySQL配置文件，mysql采用主主模式：

1)   192.9.117.140的配置文件如下：vi /etc/my.cnf

[mysqld]

datadir=/data/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

log-bin=mysql-bin

server-id = 1
auto_increment_offset=1

auto_increment_increment=2

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

master-host =192.9.117.141

master-user=tongbu

master-pass=123456

master-port =3306

master-connect-retry=60

replicate-do-db =map

2)   192.9.117.141的配置文件如下：vi /etc/my.cnf

[mysqld]

datadir=/data/mysql

socket=/var/lib/mysql/mysql.sock

user=mysql

# Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0

log-bin=mysql-bin

server-id = 2

[mysqld_safe]

log-error=/var/log/mysqld.log

pid-file=/var/run/mysqld/mysqld.pid

master-host =192.9.117.140

master-user=tongbu

master-pass=123456

master-port =3306

master-connect-retry=60

replicate-do-db =map

如上设置bin-log文件，并都设置对方为自己的主服务器，配置同步的数据库为map

三、配置MySQL：

1)   在两台mysql数据库服务器里面设置权限，分别执行如下命令：

grant  replication  slave  on *.* to  'tongbu'@'%'  identified by  '123456';

然后在141执行：

show master status;

+------------------+----------+--------------+------------------+

| File
|Position | Binlog_Do_DB | Binlog_Ignore_DB |

+------------------+----------+--------------+------------------+

| mysql-bin.000002 |

106 |
|
|

+------------------+----------+--------------+------------------+

1 row in set (0.00 sec)

2)   在192.9.117.140上将192.9.117.141设为自己的主服务器执行如下命令：

change master to master_host='192.9.117.141',master_user='tongbu',master_password='123456',master_log_file='mysql-bin.000002',master_log_pos=106;

然后启动start slave;
注意这里写的bin-log参数是在141查看到的，即是对方的参数。

3)   然后在140执行：

show master status;

+------------------+----------+--------------+------------------+

| File
|Position | Binlog_Do_DB | Binlog_Ignore_DB |

+------------------+----------+--------------+------------------+

| mysql-bin.000003 |

445|
|
|

+------------------+----------+--------------+------------------+

1 row in set (0.00 sec)

4） 在192.9.117.141上将192.9.117.140设为自己的主服务器执行如下命令：

change master to master_host='192.9.117.140',master_user='tongbu',master_password='123456',master_log_file='mysql-bin.000003',master_log_pos=445;
然后启动start slave;

5)   MySQL同步测试配置完毕，我们会发现在任何一台mysql上更新同步的数据库里面的数据，都会同步到另一台mysql。

四、安装Keepalived:

tar zxf keepalived-1.2.1.tar.gz

cd keepalived-1.2.1 &&./configure --with-kernel-dir=/usr/src/kernels/2.6.18-164.el5-i686 &&make && make install

DIR=/usr/local/ ;cp $DIR/etc/rc.d/init.d/keepalived  /etc/rc.d/init.d/ && cp $DIR/etc/sysconfig/keepalived /etc/sysconfig/ && mkdir -p /etc/keepalived  && cp $DIR/sbin/keepalived /usr/sbin/

   if

    [ $? -eq 0 ];then

    echo "Keepalived system server config success!"

    else
    echo "Keepalived system server config failed ,please check keepalived!"
    exit 0

   fi

五、配置keepalived：

1)   创建vi  keepalived.conf文件，内容如下：

! Configuration File for keepalived

global_defs {

   notification_email {

      [email protected]

   }
   notification_email_from [email protected]

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL
}
# VIP1

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    lvs_sync_daemon_inteface eth0

    virtual_router_id 151

    priority 90

    advert_int 5

    nopreempt

    authentication {

        auth_type PASS

        auth_pass 2222

    }
    virtual_ipaddress {

        192.9.117.142
    }
}

virtual_server 192.9.117.142 3306 {

    delay_loop 6

    lb_algo wrr

    lb_kind DR

    persistence_timeout 60

    protocol TCP

    real_server 192.9.117.140 3306 {

        weight 100

        notify_down /data/sh/mysql.sh

        TCP_CHECK {

        connect_timeout 10

        nb_get_retry 3

        delay_before_retry 3

        connect_port 3306

        }
    }
}

2)   141 keepalived同样如上配置，注意keepalived配置文件里面只添加一台mysql服务器ip地址，代表只使用这一台读写。

修改为Realserver192.9.117.141，并且设置优先级为90，都是BACKUP模式，并且nopreempt不抢占即可。

配置完后启动keepalived测试，可以先停止一台mysql，然后查看本地的keepalived是否停止，并且另外一台keepalived 已经变成了MASTER，如果是那就测试成功。

如上需要设置检查脚本/data/sh/mysql.sh,脚本内容为:

pkill keepalived
下图为keepalived.conf部分配置

 

本文参考：Luwenju  Mysql Keepalived 高可用配置，my.cnf还可以优化一下参数。更多精彩内容后期分享！

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