keepalived+MySQL主主高可用

keepalived+MySQL主主高可用

一、环境介绍：

10.1.1.174:23316 M1
10.1.1.237:23316 M2

二、配置双主：略。

三、keepalive安装

[root@master1 ~]# cd /usr/local/src/[root@master1 src]# wget https://www.keepalived.org/software/keepalived-2.0.17.tar.gz[root@master1 src]# tar -xf keepalived-2.0.17.tar.gz[root@master1 src]# cd keepalived-2.0.17[root@master1 keepalived-2.0.17]# yum install openssl* libnl‐dev* gcc-c++[root@master1 keepalived-2.0.17]# ./configure --prefix=/usr/local/keepalived[root@master1 keepalived-2.0.17]# make[root@master1 keepalived-2.0.17]# make install

cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/cp /usr/local/keepalived/sbin/keepalived /usr/sbin/cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/echo "/etc/init.d/keepalived start" >> /etc/rc.localmkdir -p  /etc/keepalived/mv /etc/keepalived/keepalived.conf /root/keepalived.conf.bak

M1:keepalive配置文件：vim /etc/keepalived/keepalived.conf! Configuration File for keepalivedvrrp_script chk_mysql_port {     #检测mysql服务是否在运行。有很多方式，比如进程，用脚本检测等等    script "/etc/keepalived/chk_mysql.sh"   #这里通过脚本监测    interval 2                   #脚本执行间隔，每2s检测一次    weight -5                    #脚本结果导致的优先级变更，检测失败（脚本返回非0）则优先级 -5    fall 2                    #检测连续2次失败才算确定是真失败。会用weight减少优先级（1-255之间）    rise 1                    #检测1次成功就算成功。但不修改优先级}vrrp_instance VI_1 {    state MASTER        interface ens192      #指定虚拟ip的网卡接口，改成你自己的 eth0或者其它什么的   # mcast_src_ip 10.1.1.174    virtual_router_id 51    #路由器标识，MASTER和BACKUP必须是一致的    priority 101            #定义优先级，数字越大，优先级越高，在同一个vrrp_instance下，MASTER的优先级必须大于BACKUP的优先级。这样MASTER故障恢复后，就可以将VIP资源再次抢回来     unicast_src_ip  10.1.1.174 ##（本地IP地址）    unicast_peer {                  10.1.1.237 ##（对端IP地址）此地址一定不能忘记                       }    advert_int 1             authentication {           auth_type PASS         auth_pass 1111         }    virtual_ipaddress {            10.1.1.111    }track_script {                  chk_mysql_port             }}[root@crm-db01 ~]# cat /etc/keepalived/chk_mysql.sh         #####注意可执行权限#!/bin/bashcounter=$(netstat -na|grep "LISTEN"|grep "23316"|wc -l)if [ "${counter}" -eq 0 ]; then    /etc/init.d/keepalived stopfi

M2：keepalived配置文件：[root@#localhost keepalived]# cat keepalived.conf! Configuration File for keepalivedvrrp_script chk_mysql_port {    script "/etc/keepalived/chk_mysql.sh"    interval 2    weight -5    fall 2    rise 1}vrrp_instance VI_1 {    state BACKUP    interface ens192             #指定虚拟ip的网卡接口，改成你自己的 eth0或者其它什么的            #mcast_src_ip 10.1.1.237    virtual_router_id 51    priority 90    unicast_src_ip  10.1.1.237 ##（本地IP地址）    unicast_peer {                  10.1.1.174       ##（对端IP地址）此地址一定不能忘记                       }    advert_int 1    authentication {        auth_type PASS        auth_pass 1111    }    virtual_ipaddress {        10.1.1.111    }track_script {   chk_mysql_port}}[root@#localhost keepalived]# cat chk_mysql.sh           #####注意可执行权限#!/bin/bashcounter=$(netstat -na|grep "LISTEN"|grep "23316"|wc -l)if [ "${counter}" -eq 0 ]; then    /etc/init.d/keepalived stopfi

启动keepalived服务[root@master1 ~]# /etc/init.d/keepalived start常用命令：/etc/init.d/keepalived restart|start|stop/etc/init.d/mysqld restart|start|stop查看keepalive状态：systemctl status keepalived.service查看日志：tail -f /var/log/messages

四、可能出现的问题：

1.启动两个keepalived ，两边都有VIP。我这个配置文件已经修改过，应该不会出现这个情况。2.VIP起来后，无法通过VIP访问MySQL数据库。关闭防火墙或者开放相关端口。查看你的MySQL配置文件，看看有没有这个参数#bind-address = 10.1.1.237，有的话注释掉，重启数据库。