企业级应用,持久层架构方案二(双主同步高可用二)
这是企业级应用,持久层架构方案的第二篇。在上一篇:企业级应用,持久层架构方案一(双主同步高可用)中。已经准备好了两台mysql数据库节点:hadoop001、hadoop002。两个节点互为主备,实现舒双主同步高可用,如何叫做双主同步高可用呢?其实要分为两个问题:一个是双主同步,互为主备;另一个是高可用。那么在上一篇中已经实现了双主互为主备,本篇通过keepalived虚拟ip实现高可用:
1.安装keepalived
1.1.hadoop001节点
#安装keepalived yum install keepalived -y #启动keepalived服务 /etc/init.d/keepalived start ------------------------------------------- [root@hadoop02 anginx]# /etc/init.d/keepalived start 正在启动 keepalived: [确定] [root@hadoop02 anginx]# ps -ef |grep keepalived root 15723 1 0 00:59 ? 00:00:00 /usr/sbin/keepalived -D root 15724 15723 0 00:59 ? 00:00:00 /usr/sbin/keepalived -D root 15725 15723 0 00:59 ? 00:00:00 /usr/sbin/keepalived -D root 15731 15622 0 00:59 pts/1 00:00:00 grep keepalived [root@hadoop02 anginx]# #设置开机自启动 echo "/etc/init.d/keepalived start" >>/etc/rc.local #关闭keepalived服务 /etc/init.d/keepalived stop
1.2.hadoop002节点
说明:参考hadoop001节点安装
2.配置keepalived
2.1.hadoop001节点
#编辑keepalived配置文件 vi /etc/keepalived/keepalived.conf ----------------------------------------------------------- ! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id mysql_ha } vrrp_instance VI_1 { state BACKUP interface eth1 virtual_router_id 55 priority 100 advert_int 1 nopreempt #不主动抢占资源,只在master这台优先级高的设置,backup不设置 authentication { auth_type PASS auth_pass server123 } virtual_ipaddress { 192.168.80.40 dev eth1 label eth1:1 } } virtual_server 192.168.80.40 3306 { delay_loop 2 #lb_algo rr #LVS算法,用不到,我们就关闭了 #lb_kind DR #LVS模式,如果不关闭,备用服务器不能通过VIP连接主MySQL persistence_timeout 60 #同一IP的连接60秒内被分配到同一台真实服务器 protocol TCP real_server 192.168.80.30 3306 { #检测本地mysql,backup也要写检测本地mysql weight 3 notify_down /usr/local/develop/shell/mysql.sh #当mysq服down时,执行此脚本,杀死keepalived实现切换 TCP_CHECK { connect_timeout 3 #连接超时 nb_get_retry 3 #重试次数 delay_before_retry 3 #重试间隔时间 } } ...........................................................
2.2.hadoop002节点
#编辑keepalived配置文件 vi /etc/keepalived/keepalived.conf ----------------------------------------------------------- ! Configuration File for keepalived global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id mysql_ha } vrrp_instance VI_1 { state BACKUP interface eth1 virtual_router_id 55 priority 90 advert_int 1 authentication { auth_type PASS auth_pass server123 } virtual_ipaddress { 192.168.80.40 dev eth1 label eth1:1 } } virtual_server 192.168.80.40 3306 { delay_loop 2 #lb_algo rr #LVS算法,用不到,我们就关闭了 #lb_kind DR #LVS模式,如果不关闭,备用服务器不能通过VIP连接主MySQL persistence_timeout 60 #同一IP的连接60秒内被分配到同一台真实服务器 protocol TCP real_server 192.168.80.31 3306 { #检测本地mysql,backup也要写检测本地mysql weight 3 notify_down /usr/local/develop/shell/mysql.sh #当mysq服down时,执行此脚本,杀死keepalived实现切换 TCP_CHECK { connect_timeout 3 #连接超时 nb_get_retry 3 #重试次数 delay_before_retry 3 #重试间隔时间 } } ...........................................................
3.编写切换脚本
#mysql.sh脚本 cd /usr/local/develop/shell vi mysql.sh ----------------------------------------------------------- #!/bin/bash pkill keepalived #给脚本添加执行权限 chmod u+x mysql.sh #重新启动keepalived /etc/init.d/keepalived restart
4.测试方案
1.分别在hadoop001、hadoop002节点启动mysql服务 2.分别在hadoop001、hadoop002节点启动keepalived服务 3.通过虚拟ip:192.168.80.40连接mysql服务,并进行操作,检查是否正常 4.假设当前虚ip是落在hadoop001节点 5.停止hadoop001节点的mysql服务,再次进行相关mysql操作,检查是否正常
我们唯一能够控制的是自己的脾气和努力