keepalived+mysql主从实现数据库冗余

一、安装mysql,并设置主备服务器

1、将下面的代码复制到一个后缀为.sh的shell脚本文件中(脚本很容易看懂）

# vi /etc/scripts/mysql.sh

##/bin/bash

rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

yum -y install mysql mysql-server mysql-devel

#定义一个数值Level(设置数据库主从）

echo "Enter the "Master"(1) or "slave"=(2)"

read Level

#定义一个数值mysql（需要同步的具体某个数据库，需要同步所有数据库，就将这段以及后面有关代码删掉即可）

echo "Enter the Sync database"

read mysql                    

cat > /etc/my.cnf <<Eof

#做一些数据库优化

[mysql]

# CLIENT #

port                           = 3306

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

[mysqld]

# GENERAL #

user                           = mysql

default-storage-engine         = InnoDB

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

pid-file                       = /var/lib/mysql/mysql.pid

# MyISAM #

key-buffer-size                = 32M

myisam-recover                 = FORCE,BACKUP

# SAFETY #

max-allowed-packet             = 16M

max-connect-errors             = 1000000

# DATA STORAGE #

datadir                        = /var/lib/mysql/

# BINARY LOGGING #

log-bin                        = /var/lib/mysql/mysql-bin

expire-logs-days               = 14

sync-binlog                    = 1

# REPLICATION #

relay-log                      = /var/lib/mysql/relay-bin

slave-net-timeout              = 60

# CACHES AND LIMITS #

tmp-table-size                 = 32M

max-heap-table-size            = 32M

query-cache-type               = 0

query-cache-size               = 0

max-connections                = 500

thread-cache-size              = 50

open-files-limit               = 65535

table-definition-cache         = 4096

table-open-cache               = 4096

# INNODB #

innodb-flush-method            = O_DIRECT

innodb-log-files-in-group      = 2

innodb-log-file-size           = 128M

innodb-flush-log-at-trx-commit = 2

innodb-file-per-table          = 1

innodb-buffer-pool-size        = 2G

# LOGGING #

log-error                      = /var/lib/mysql/mysql-error.log

log-queries-not-using-indexes  = 1

slow-query-log                 = 1

slow-query-log-file            = /var/lib/mysql/mysql-slow.log

srver-id = $Level

#需要同步整个数据库就将下面两段代码删掉

binlog-do-db = $mysql

replicate-do-db = $mysql

log-slave-updates

sync_binlog = 1

auto_increment_offset = $Level

auto_increment_increment = 2

Eof

service mysqld restart

chkconfig mysqld on

2、添加脚本执行权限

# chmod  /etc/scripts/mysql.sh

二、安装keepalived

1、将如下代码复制到后缀名为.sh的shell脚本文件

# vi /etc/scripts/keepalived.sh

##!/bin/bash

yum install keepalived -y

#定义keepalived的虚拟IP

echo "VIP:"

read VIP

#定义主服务器，还是备份服务器

echo "MASTER OR BACKUP:"

read state

#定义优先级

echo "priority: (MASTER:100 BACKUP:99)"

read priority

#定义虚拟路由，主备要一样

echo "virtual_router_id:"

read virtual_router_id

cat > /etc/keepalived/keepalived.conf <<Eof

#! Configuration File for keepalived

global_defs {

#router_id mysql-ha1 #修改为自己的主机名

             }

vrrp_script chk_haproxy {

    script "/etc/keepalived/chk_slave.sh"

    interval 2

    weight 2

}

vrrp_instance VI_1 {

     state $state #都修改成BACKUP

     interface eth0

     virtual_router_id $virtual_router_id #默认51 主从都修改为60

     priority $priority #在mysql-ha2上LVS上修改成80

     advert_int 1

#     nopreempt #不抢占资源，意思就是它活了之后也不会再把主抢回来

     authentication {

     auth_type PASS

     auth_pass 1111

     }

    track_script {

        chk_haproxy

    }

virtual_ipaddress {

     $VIP

     }

}

Eof

echo "Enter the database password"

read password

cat /etc/keepalived/check_slave.sh <<Eof

##/bin/bash

    Mysql=$(mysql -uroot -p$password -N -s -e "select 10")

    if [ $? -ne 0 ] || [ "$Mysql" -ne "10" ];then

      service keepalived stop

      exit 1

    else

      SlaveStatus=($(mysql -uroot -p$password -e "show slave status\G;"|grep "_Running"|awk ‘{print  $NF}‘))

            if [ "$SlaveStatus[0]" = "No" ] || [  "${SlaveStatus[1]}" = "No" ];then

                    service keepalived stop

            fi

    fi

Eof

2、添加脚本执行权限

# chmod  /etc/scripts/keepalived.sh

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keepalived+mysql主从实现数据库冗余

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