keepalived+mysql实现高可用

为了响应公司需求,打造出更安全的mysql集群,能够实现mysql故障后切换,研究了几天终于有了成果,一起分享一下。
首先介绍一下这套集群方案实现的功能
1、mysql服务器故障后自动转移,修好后自动切回
2、mysql服务故障自动转移,修好后自动切回
3、可以实现在几秒钟内转移
以下内容均是实验环境,请根据实际情况修改响应参数
生产环境MySQL主主同步主键冲突处理 http://www.linuxidc.com/Linux/2013-07/86890.htm
MySQL + KeepAlived + LVS 单点写入主主同步高可用架构实验 http://www.linuxidc.com/Linux/2013-05/84002.htm
MySQL 主主同步配置 http://www.linuxidc.com/Linux/2013-05/83815.htm
CentOS 6.3下MySQL主从复制笔记 http://www.linuxidc.com/Linux/2013-06/85983.htm
Linux下的MySQL主主复制 http://www.linuxidc.com/Linux/2013-10/91683.htm
实验环境:
mysql1 ip:10.1.1.20
mysql2  ip:10.1.1.21
mysql vip:10.1.1.25
三台机器均安装centos 6.5 32位(虚拟机环境)
实验开始!!!
一、安装mysql,并打造主主同步。
相信主从同步大家都会做,一样的道理,主主同步就是两台机器互为主的关系,在任何一台机器上写入都会同步。
安装mysql的过程不解释,yum就好啦
配置主主同步
1.配置 /etc/my.cnf
[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
user=mysql

Disabling symbolic-links is recommended to prevent assorted security risks

symbolic-links=0
log-bin=binlog  #开启binlog功能
log-bin-index=binlog.index
sync_binlog=0
server_id = 1    #两台机器不能重复,一个1 一个2 就好
 
[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

2.分别在两台机器上配置同步账号
10.1.1.20机器上:
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with; or \g.
Your MySQL connection id is 2
Server version: 5.0.77-log Sourcedistribution
 
Type 'help;' or '\h' for help. Type '\c' toclear the buffer.
 
mysql> GRANT replication slave ON . TO'ab'@'%' identified by '123';
Query OK, 0 rows affected (0.00 sec)
 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
10.1.1.21机器上:
[root@localhost ~]# mysql
Welcome to the MySQL monitor. Commands end with; or \g.
Your MySQL connection id is 2
Server version: 5.0.77-log Sourcedistribution
 
Type 'help;' or '\h' for help. Type '\c' toclear the buffer.
 
mysql> GRANT replication slave ON . TO'ab'@'%' identified by '123';
Query OK, 0 rows affected (0.00 sec)
 
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

注:由于本文是实验环境下编写,所以没考虑任何安全性问题,同步账号也是最高权限,请根据实际情况设置响应权限!!
3.设置同步
10.1.1.20机器上:
mysql> flush tables with read lock;
mysql> show master status;
+---------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |
+---------------+----------+--------------+------------------+
| binlog.000003 | 365 | | |
+---------------+----------+--------------+------------------+
1 row in set (0.03 sec)
mysql> unlock tables;
Query OK, 0 rows affected (0.03 sec)
10.1.1.21机器上:
mysql> change master tomaster_host='10.1.1.20', master_port=3306, master_user='ab',master_password='123', master_log_file='binlog.000003',master_log_pos=365;
Query OK, 0 rows affected (0.06 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G  #执行这命令后 注意观察下面这两个参数,必须要都是yes才行
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
同样的 反过来做相同操作
10.1.1.21机器上:
mysql> flush tables with read lock;
mysql> show master status;
+---------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB |Binlog_Ignore_DB |
+---------------+----------+--------------+------------------+
| binlog.000004 | 207 | | |
+---------------+----------+--------------+------------------+
1 row in set (0.03 sec)
mysql> unlock tables;
Query OK, 0 rows affected (0.03 sec)
10.1.1.20机器上:
 
mysql> change master tomaster_host='10.1.1.21', master_port=3306, master_user='ab',master_password='123', master_log_file='binlog.000004',master_log_pos=207;
Query OK, 0 rows affected (0.06 sec)
mysql> start slave;
Query OK, 0 rows affected (0.00 sec)
mysql> show slave status \G  #执行这命令后 注意观察下面这两个参数,必须要都是yes才行
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
介此,主主同步打造完成,可以简单测试一下,分别在两个机器上写数据 看看会不会同步到另一台机器上
PS:如果报错  Slave_IO_Running: NO  可以检查同步的账号是否创建正常!
二、安装keepalived 并设置监控
keepalived是安装在两台MySQL服务器上的
首先安装keepalived 过程不解释就正常解压安装就好
安装后配置 vim /etc/keepalived/keepalived.conf 内容如下
10.1.1.20的配置文件
! 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 127.0.0.1
  smtp_connect_timeout 30
  router_id LVS_DEVEL
}
 
vrrp_instance VI_1 {
  state backup      #两台配置此处均是BACKUP
  interface eth0
  virtual_router_id 51
  priority 100      #优先级,另一台改为90 
  advert_int 1
  nopreempt          #不抢占,只在优先级高的机器上设置即可,优先级低的机器不设置
  authentication {
      auth_type PASS
      auth_pass 1111
  }
  virtual_ipaddress {
      10.1.1.25
  }
}
 
virtual_server 10.1.1.25 3306 {
  delay_loop 6
  lb_algo wrr
  lb_kind DR
  persistence_timeout 50        #会话保持时间 
  protocol TCP
 
real_server 10.1.1.20 3306 {
      weight 3
      notify_down /tmp/nimei.sh    #检测到mysql服务挂了就执行这个脚本(脚本要自己写哈)
      TCP_CHECK {
      connect_timeout 10        #连接超时时间
      nb_get_retry 3            #重连次数 
      delay_before_retry 3      #重连间隔时间
      connect_port 3306        #健康检查端口 
        }
      }
}

10.1.1.21 的配置文件! Configuration File for keepalivedglobal_defs {  notification_email {    acassen@firewall.loc    failover@firewall.loc    sysadmin@firewall.loc  }  notification_email_from Alexandre.Cassen@firewall.loc  smtp_server 127.0.0.1  smtp_connect_timeout 30  router_id LVS_DEVEL} vrrp_instance VI_1 {  state backup  interface eth0  virtual_router_id 51  priority 90  advert_int 1  authentication {      auth_type PASS      auth_pass 1111  }  virtual_ipaddress {      10.1.1.25  }} virtual_server 10.1.1.25 3306 {  delay_loop 6  lb_algo wrr  lb_kind DR  persistence_timeout 50  protocol TCP real_server 10.1.1.21 3306 {      weight 3      notify_down /tmp/nimei.sh      TCP_CHECK {      connect_timeout 10      nb_get_retry 3      delay_before_retry 3      connect_port 3306          }      }} 编写监控mysql服务是否挂了的脚本,按照上面配置文件的位置编写脚本。vim /tmp/nimei.sh#!/bin/sh pkill keepalived脚本很简单啊 就一句,目的是当keepalived检测到mysql服务挂了之后触发这个脚本,杀死keepalived进程,让另一台机器接管好 修改后启动keeplived服务介此整个集群搭建完成三、测试找一台机器用虚拟ip连接mysql[root@localhost html]# mysql -uab  -h 10.1.1.25 -p123Welcome to the MySQL monitor.  Commands end with ; or \g.Your MySQL connection id is 736Server version: 5.1.66-log Source distribution Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.mysql>

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