mysql dba系统学习（19） 实现Mysql读操作负载均衡

环境：

test1192.168.46.131master

test2192.168.46.130slave备份test库

test3调度器

1、安装与配置Keepalived

首先在节点test1、test2上安装Keepalived软件，软件安装非常简单。

[root@test1 ]# yum install -y openssl-devel
[root@test1 ~]# wget  http://www.keepalived.org/software/keepalived-1.2.1.tar.gz
[root@test1 ~]# tar zxvf keepalived-1.2.1.tar.gz
[root@test1 ~]# cd keepalived-1.2.1
[root@test1 keepalived-1.2.1]# ./configure --prefix=/usr/local/keepalived
[root@test1 keepalived-1.2.1]# make && make install
[root@test1 ~]# cp /usr/local/keepalived/etc/sysconfig/keepalived  /etc/sysconfig/
[root@test1 ~]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived  /etc/init.d/
[root@test1 ~]# mkdir  /etc/keepalived
[root@test1 ~]# cp  /usr/local/keepalived/etc/keepalived  /keepalived.conf  /etc/keepalived/
[root@test1 ~]# ln -s  /usr/local/keepalived/sbin/keepalived  /usr/sbin/
[root@test1 ~]# service keepalived start
Starting keepalived:                                       [  OK  ]

Keepalived的配置也非常简单，仅仅需要一个配置文件即可完成HAcluster和lvs服务节点监控功能，在通过Keepalived搭建高可用的LVS集群实例中，主、备DirectorServer都需要安装Keepalived软件，安装成功后，默认的配置文件路径为/etc/Keepalived/Keepalived.conf。

查看本栏目更多精彩内容：http://www.bianceng.cn/database/MySQL/

一个完整的keepalived配置文件，有三个部分组成，分别是全局定义部分、vrrp实例定义部分以及虚拟服务器定义部分，配置好的文件内容如下：

! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from  root@localhost
smtp_server 192.168.46.131
smtp_connect_timeout 30
router_id LVS_MASTER
}
vrrp_instance VI_1 {
state MASTER      //备库为BACKUP
interface eth2     //通过的网卡
virtual_router_id 51
priority 100      //备库为99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.46.100
}
}
virtual_server 192.168.46.100 3306 {
delay_loop 30
lb_algo rr
lb_kind DR
persistence_timeout 50
protocol TCP
real_server 192.168.46.131 3306 {
weight 1
MISC_CHECK{
misc_path "/etc/keepalived/check_slave.pl 192.168.46.131"
misc_dynamic
}
}
real_server 192.168.46.130 3306 {
weight 1
MISC_CHECK{
misc_path "/etc/keepalived/check_slave.pl 192.168.46.130"
misc_dynamic
}
}
}
}

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