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
[[email protected] ~]# bash keepalive_install.sh
“脚本”内容如下：
[[email protected] ~]# 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
加载ip_vs的内核模块
[[email protected] ~]# modprobe ip_vs [[email protected]~]# modprobe ip_vs_wrr [[email protected]~]# modprobe ip_vs_rr
修改keepalived.conf配置文件如下：
[[email protected] ~]# vim /etc/keepalived/keepalived.conf [[email protected] ~]# cat/etc/keepalived/keepalived.conf
! 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
}
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
}
}
}
[[email protected] ~]# mkdir -p /data/sh [[email protected] ~]# vim/data/sh/keepalive_stop.sh [[email protected] ~]# chmod +x /data/sh/keepalive_stop.sh [[email protected] ~]# /etc/init.d/keepalivedreload Reloading keepalived: [ OK ] [[email protected] ~]# cat/data/sh/keepalive_stop.sh #!/bin/bash /etc/init.d/keepalived stop [[email protected] ~]#
二、在从mysql上安装配置keepalive
[[email protected] ~]# bash keepalive_install.sh
“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)。
[[email protected] ~]# 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 [[email protected] ~]#
加载ip_vs的内核模块
[[email protected] ~]# modprobe ip_vs [[email protected] ~]# modprobe ip_vs_wrr [[email protected] ~]# modprobe ip_vs_rr
修改keepalived.conf配置文件如下
[[email protected] ~]# vim/etc/keepalived/keepalived.conf [[email protected] ~]# cat/etc/keepalived/keepalived.conf
! 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
}
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
}
}
}
[[email protected] ~]# [email protected] ~]# mkdir -p /data/sh [[email protected] ~]# vim/data/sh/keepalive_stop.sh [[email protected] ~]# chmod +x/data/sh/keepalive_stop.sh [[email protected] ~]# /etc/init.d/keepalivedreload Reloading keepalived: [ OK ] [[email protected] ~]# cat/data/sh/keepalive_stop.sh #!/bin/bash /etc/init.d/keepalived stop [[email protected] ~]#
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
[[email protected] ~]#sed -i ‘s/192.168.1.3/192.168.1.77/‘/usr/local/apache/htdocs/config/config_global.php [[email protected] ~]#/usr/local/apache/bin/apachectl restart
在slave上
[[email protected] ~]#sed -i ‘s/192.168.1.3/192.168.1.77/‘/usr/local/apache/htdocs/config/config_global.php [[email protected] ~]#/usr/local/apache/bin/apachectl restart
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
时间： 2024-10-14 14:53:01