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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
Mysql主从参见
实验步骤：
一、在主mysql上安装配置keepalive
| 1 | [root@master ~] # bash keepalive_install.sh |
“脚本”内容如下：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | [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 |
加载ip_vs的内核模块
| 1 2 3 | [root@master ~] # modprobe ip_vs [root@master~] # modprobe ip_vs_wrr [root@master~] # modprobe ip_vs_rr |
修改keepalived.conf配置文件如下：
| 1 2 | [root@master ~] # vim /etc/keepalived/keepalived.conf [root@master ~] # cat/etc/keepalived/keepalived.conf |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | ! 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 } } } |
| 1 2 3 4 5 6 7 8 9 | [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 ~] # |
二、在从mysql上安装配置keepalive
| 1 | [root@slave ~] # 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)。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | [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 ~] # |
加载ip_vs的内核模块
| 1 2 3 | [root@master ~] # modprobe ip_vs [root@master ~] # modprobe ip_vs_wrr [root@master ~] # modprobe ip_vs_rr |
修改keepalived.conf配置文件如下
| 1 2 | [root@slave ~] # vim/etc/keepalived/keepalived.conf [root@slave ~] # cat/etc/keepalived/keepalived.conf |
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | ! 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 } } } |
| 1 2 3 4 5 6 7 8 9 10 | [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 ~] # |
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
| 1 2 | [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 |
在slave上
| 1 2 | [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 |
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