实验目的：
通过Keepalive来构建Mysql的高可用。Mysql已做主从，当一台Mysql宕机的时候不影响对Mysql的调用。
实验环境：
两台Mysql服务器(基于LAMP且已做主从)，两台Mysql服务器都通过Apache发布Discuz论坛(discuz调用的是主mysql地址)。
身份 主机名 IP地址
主Mysql master 192.168.1.3
从Myslq slave 192.168.1.4
LAMP平台请参见<<搭建Discuz论坛的两种方式>>
Mysql主从参见<<构建Mysql三部曲之三 主从案例>>
实验步骤：
一、在主mysql上安装配置keepalive
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[root@master ~]
# bash keepalive_install.sh
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“脚本”内容如下：
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[root@master ~]
# cat keepalive_install.sh
#!/bin/bash
yum -y
install
kernel-devel openssl-devel popt-devel &&
wgethttp:
//www
.keepalived.org
/software/keepalived-1
.1.15.
tar
.gz &&
tar
-zxf keepalived-1.1.15.
tar
.gz &&
cd
keepalived-1.1.15 &&
.
/configure--with-kernel-dir
=
/usr/src/kernels/2
.6.32-431.el6.x86_64/ &&
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/
&&
cp
/usr/local/etc/keepalived/keepalived
.conf
/etc/keepalived/
&&
/etc/init
.d
/keepalived
restart
if
[ $? -
eq
0 ];
then
echo
-e
'\e[32mInstall Keepalive Successfully!\e[0m'
else
echo
-e
'\e[31mInstall Keepalive Failure!\e[0m'
fi
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加载ip_vs的内核模块
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[root@master ~]
# modprobe ip_vs
[root@master~]
# modprobe ip_vs_wrr
[root@master~]
# modprobe ip_vs_rr
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修改keepalived.conf配置文件如下：
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[root@master ~]
# vim /etc/keepalived/keepalived.conf
[root@master ~]
# cat/etc/keepalived/keepalived.conf
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! Configuration File
for
keepalived
global_defs {
notification_email {
654001593@qq.com
}
notification_email_from root@localhost.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.77
}
}
virtual_server 192.168.1.77 3306 {
delay_loop 6
lb_algo wrr
lb_kind DR
persistence_timeout 50
protocol TCP
real_server 192.168.1.3 3306 {
weight 1
notify_down
/data/sh/
keepalive_stop.sh
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
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[root@master ~]
# mkdir -p /data/sh
[root@master ~]
# vim/data/sh/keepalive_stop.sh
[root@master ~]
# chmod +x /data/sh/keepalive_stop.sh
[root@master ~]
# /etc/init.d/keepalivedreload
Reloading keepalived: [ OK ]
[root@master ~]
# cat/data/sh/keepalive_stop.sh
#!/bin/bash
/etc/init
.d
/keepalived
stop
[root@master ~]
#
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二、在从mysql上安装配置keepalive
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[root@slave ~]
# bash keepalive_install.sh
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“脚本”内容如下，同master上执行的脚本一致(非严格意义上的脚本，安装命令放一起而已)。
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[root@slave ~]
# cat keepalive_install.sh
#!/bin/bash
yum -y
install
kernel-developenssl-devel popt-devel &&
wget http:
//www
.keepalived.org
/software/keepalived-1
.1.15.
tar
.gz&&
tar
-zxf keepalived-1.1.15.
tar
.gz &&
cd
keepalived-1.1.15 &&
.
/configure--with-kernel-dir
=
/usr/src/kernels/2
.6.32-431.el6.x86_64/ &&
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/
&&
cp
/usr/local/etc/keepalived/keepalived
.conf
/etc/keepalived/
&&
/etc/init
.d
/keepalived
restart
if
[ $? -
eq
0 ];
then
echo
-e
'\e[32mInstall Keepalive Successfully!\e[0m'
else
echo
-e
'\e[31mInstall Keepalive Failure!\e[0m'
fi
[root@slave ~]
#
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加载ip_vs的内核模块
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[root@master ~]
# modprobe ip_vs
[root@master ~]
# modprobe ip_vs_wrr
[root@master ~]
# modprobe ip_vs_rr
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修改keepalived.conf配置文件如下
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[root@slave ~]
# vim/etc/keepalived/keepalived.conf
[root@slave ~]
# cat/etc/keepalived/keepalived.conf
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! Configuration File
for
keepalived
global_defs {
notification_email {
654001593@qq.com
}
notification_email_from root@localhost.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state BACKUP !此处同master不一样
interface eth0
virtual_router_id 51
priority 90 !优先级比master上低
advert_int 1
authentication{
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.77
}
}
virtual_server 192.168.1.77 3306 {
delay_loop 6
lb_algo wrr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP
real_server 192.168.1.4 3306 { !Slave上的IP
weight 1
notify_down
/data/sh/keepalive_stop
.sh
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 3306
}
}
}
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[root@slave ~]
#
root@slave ~]
# mkdir -p /data/sh
[root@slave ~]
# vim/data/sh/keepalive_stop.sh
[root@slave ~]
# chmod +x/data/sh/keepalive_stop.sh
[root@slave ~]
# /etc/init.d/keepalivedreload
Reloading keepalived: [ OK ]
[root@slave ~]
# cat/data/sh/keepalive_stop.sh
#!/bin/bash
/etc/init
.d
/keepalived
stop
[root@slave ~]
#
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三、修改Discuz论坛数据库连接IP为VIP
直接访问master上的192.168.1.3论坛是可以访问的，且直接访问slave上的192.168.1.4论坛也是可以访问的，现在我们直接访问VIP(虚拟IP) 192.168.1.77依旧可以访问论坛。
这个时候因为discuz调用的是master上的数据库IP，所以我们应该让其调用VIP 192.168.1.77,这样才能保证在主挂的时候自动切换到从上。
在master上
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[root@master ~]
#sed -i 's/192.168.1.3/192.168.1.77/'/usr/local/apache/htdocs/config/config_global.php
[root@master ~]
#/usr/local/apache/bin/apachectl restart
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在slave上
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[root@slave ~]
#sed -i 's/192.168.1.3/192.168.1.77/'/usr/local/apache/htdocs/config/config_global.php
[root@slave ~]
#/usr/local/apache/bin/apachectl restart
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四、测试
上边两个图很明显可以看出此时VIP在master上。
手动模拟master上的mysql关闭
VIP自动漂到slave上
论坛依旧可以访问
本文转自Jacken_yang 51CTO博客，原文链接：http://blog.51cto.com/linuxnote/1653242，如需转载请自行联系原作者
