环境:

DB1:centos6.8、mysql5.5、192.168.2.204  hostname:bogon

DB2:centos6.8、mysql5.5、192.168.2.205  hostname:localhost.localdomain

vip:192.168.2.33

 

一、先配置DB1和DB2的双主热备

 

1、分别在DB1和DB2上安装mysql,我这里是用的ansible自动部署

[root@www ansible]# ansible-playbook lnmp.yml 

PLAY [new] *********************************************************************

TASK [setup] *******************************************************************
ok: [192.168.2.205]
ok: [192.168.2.204]

TASK [mysql : Create backup folder] ********************************************
ok: [192.168.2.204]
ok: [192.168.2.205]

TASK [mysql : create log folder] ***********************************************
changed: [192.168.2.204]
changed: [192.168.2.205]

TASK [mysql : copy mysql_tar_gz to client] *************************************
changed: [192.168.2.204]
changed: [192.168.2.205]

TASK [mysql : copy install_script to client] ***********************************
changed: [192.168.2.204]
changed: [192.168.2.205]

TASK [mysql : copy my.cnf to /data/backup] *************************************
changed: [192.168.2.204]
changed: [192.168.2.205]

TASK [mysql : install mysql] ***************************************************
changed: [192.168.2.204]
changed: [192.168.2.205]

PLAY RECAP *********************************************************************
192.168.2.204              : ok=7    changed=5    unreachable=0    failed=0   
192.168.2.205              : ok=7    changed=5    unreachable=0    failed=0   

2、修改mysql的配置文件

首先修改DB1主机的配置文件,在/etc/my.cnf文件中的[mysqld]段添加以下内容

[root@bogon ~]# vim /etc/my.cnf
server-id = 1    #节点标示,主从节点不能相同,必须全局唯一
log-bin=mysql-bin  #开启mysql的binlog日志功能
relay-log = mysql-relay-bin   #开启relay-log日志,relay-log日志记录的是从服务器I/O线程将主服务器的二进制日志读取过来记录到从服务器本地文件,然后SQL线程会读取relay-log日志的内容并应用到从服务器
replicate-wild-ignore-table=mysql.%  #复制过滤选项
replicate-wild-ignore-table=test.%
replicate-wild-ignore-table=information_schema.%

 

然后修改DB2主机的配置文件,

[root@localhost ~]# vim /etc/my.cnf
server-id = 2
log-bin=mysql-bin
relay-log = mysql-relay-bin
replicate-wild-ignore-table=mysql.%
replicate-wild-ignore-table=test.%
replicate-wild-ignore-table=information_schema.%

最后分别重启DB1和DB2使配置生效

 

3、创建复制用户并授权

注:在执行主主互备之前要保证两台server上数据一致

 

首先在DB1的mysql库中创建复制用户

mysql> grant replication slave on *.* to 'repl_user'@'192.168.2.205' identified by 'repl_passwd';
Query OK, 0 rows affected (0.04 sec)

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000004 |      271 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

然后在DB2的mysql库中将DB1设为自己的主服务器

mysql> change master to \
    -> master_host='192.168.2.204',  
    -> master_user='repl_user',
    -> master_password='repl_passwd',
    -> master_log_file='mysql-bin.000004',  
    -> master_log_pos=271;
Query OK, 0 rows affected (0.07 sec)

这里需要注意master_log_file和master_log_pos两个选项,这两个选项的值是在DB1上通过“show master status” 查询到的结果

 

接着在DB2上启动slave服务

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

下面查看DB2上slave的运行状态,

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.2.204
                  Master_User: repl_user
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000005
          Read_Master_Log_Pos: 271
               Relay_Log_File: mysql-relay-bin.000002
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000005
             Slave_IO_Running: Yes    #重点
            Slave_SQL_Running: Yes    #重点
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: mysql.%,test.%,information_schema.%  #跳过的表
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 271
              Relay_Log_Space: 409
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 1
1 row in set (0.00 sec)

到这里,从DB1到DB2的mysql主从复制已经完成。接下来开始配置从DB2到DB1的mysql主从复制

在DB2的mysql库中创建复制用户

mysql> grant replication slave on *.* to 'repl_user'@'192.168.2.204' identified by 'repl_passwd';
Query OK, 0 rows affected (0.00 sec)

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000005 |      271 |              |                  |
+------------------+----------+--------------+------------------+
1 row in set (0.00 sec)

然后在DB1的mysql库中将DB2设为自己的主服务器

mysql> change master to \
    -> master_host='192.168.2.205',
    -> master_user='repl_user',
    -> master_password='repl_passwd',
    -> master_log_file='mysql-bin.000005',
    -> master_log_pos=271;
Query OK, 0 rows affected (0.07 sec)

最后,在DB1上启动slave服务

mysql> start slave;
Query OK, 0 rows affected (0.01 sec)

查看DB1上slave的运行状态

mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.2.205
                  Master_User: repl_user
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000005
          Read_Master_Log_Pos: 271
               Relay_Log_File: mysql-relay-bin.000002
                Relay_Log_Pos: 253
        Relay_Master_Log_File: mysql-bin.000005
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB: 
          Replicate_Ignore_DB: 
           Replicate_Do_Table: 
       Replicate_Ignore_Table: 
      Replicate_Wild_Do_Table: 
  Replicate_Wild_Ignore_Table: mysql.%,test.%,information_schema.%
                   Last_Errno: 0
                   Last_Error: 
                 Skip_Counter: 0
          Exec_Master_Log_Pos: 271
              Relay_Log_Space: 409
              Until_Condition: None
               Until_Log_File: 
                Until_Log_Pos: 0
           Master_SSL_Allowed: No
           Master_SSL_CA_File: 
           Master_SSL_CA_Path: 
              Master_SSL_Cert: 
            Master_SSL_Cipher: 
               Master_SSL_Key: 
        Seconds_Behind_Master: 0
Master_SSL_Verify_Server_Cert: No
                Last_IO_Errno: 0
                Last_IO_Error: 
               Last_SQL_Errno: 0
               Last_SQL_Error: 
  Replicate_Ignore_Server_Ids: 
             Master_Server_Id: 2
1 row in set (0.00 sec)

 

二、配置keepalived实现mysql双主高可用

1、安装keepalived

[root@bogon src]# tar zxf keepalived-1.2.24.tar.gz 
[root@bogon src]# cd keepalived-1.2.24
[root@bogon keepalived-1.2.24]# ./configure --sysconf=/etc --with-kernel-dir=/lib/modules/2.6.32-642.3.1.el6.x86_64/
[root@bogon keepalived-1.2.24]# make && make install
[root@bogon keepalived-1.2.24]# ln -s /usr/local/sbin/keepalived /sbin/
[root@bogon keepalived-1.2.24]# chkconfig --add keepalived
[root@bogon keepalived-1.2.24]# chkconfig --level 35 keepalived on
[root@bogon keepalived-1.2.24]# yum  -y install ipvsadm ####之前没安装ipvsadm,导致 keepalived配置中lvs配置部分不生效,其中定义的notify_down 字段死活不生效,查了好久在发现是没安装ipvsadm导致的,泪奔!!!
[root@bogon keepalived-1.2.24]# ipvsadm

2、配置keepalived

DB1上keepalived.conf配置为

[root@bogon keepalived-1.2.24]# cat /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 LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}




vrrp_instance HA_1 {
    state BACKUP    #在DB1和DB2上均配置为BACKUP
    interface eth1
    virtual_router_id 90 
    priority 100
    advert_int 1
    nopreempt    #不抢占模式,只有优先级高的机器上设置即可,优先级低的机器可不设置
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    192.168.2.33
    }
}

virtual_server 192.168.2.33 3306 {
     delay_loop 2
     lb_algo wrr
     lb_kind DR
     persistence_timeout 60  #会话保持时间 
     protocol TCP
     real_server 192.168.2.204 3306 {
         weight 3
         notify_down /root/shutdown.sh  #检测到服务down后执行的脚本 
         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
         } 
     }
}

 

 

DB2上keepalived.conf配置为

[root@localhost keepalived-1.2.24]# cat /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 LVS_DEVEL
   vrrp_skip_check_adv_addr
   vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
}




vrrp_instance HA_1 {
    state BACKUP
    interface eth1
    virtual_router_id 90 
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    192.168.2.33
    }
}

virtual_server 192.168.2.33 3306 {
     delay_loop 2
     lb_algo wrr
     lb_kind DR
     persistence_timeout 60
     protocol TCP
     real_server 192.168.2.205 3306 {
         weight 3
         notify_down /root/shutdown.sh
         TCP_CHECK {
             connect_timeout 10
             nb_get_retry 3
             delay_before_retry 3
             connect_port 3306
         } 
     }
}

 

编写检测服务down后所要执行的脚本shutdown.sh

[root@bogon ~]# cat /root/shtdown.sh 
#!/bin/bash
killall keepalived

注:此脚本是上面配置文件notify_down选项所用到的,keepalived使用notify_down选项来检查real_server的服务状态,当发现real_server服务故障时,便触发此脚本;我们可以看到,脚本就一个命令,通过killall keepalived强制杀死keepalived进程,从而实现了MySQL故障自动转移。另外,我们不用担心两个MySQL会同时提供数据更新操作,因为每台MySQL上的keepalived的配置里面只有本机MySQL的IP+VIP,而不是两台MySQL的IP+VIP

 

启动keepalived并查看日志

[root@bogon keepalived-1.2.24]# chmod 755 /etc/init.d/keepalived 
[root@bogon keepalived-1.2.24]# service keepalived start
正在启动 keepalived:                                      [确定]
[root@bogon keepalived-1.2.24]# tail -f /var/log/messages
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:35 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: VRRP_Instance(HA_1) Sending/queueing gratuitous ARPs on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33
Oct 24 22:37:40 bogon Keepalived_vrrp[20835]: Sending gratuitous ARP on eth1 for 192.168.2.33

 

三、测试功能

1、在远程客户端通过vip登陆测试

[root@www ansible]# mysql -h 192.168.2.33 -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2372
Server version: 5.5.37-log Source distribution

Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>

  mysql> show variables like "%hostname%"
  -> ;
  +---------------+-------+
  | Variable_name | Value |
  +---------------+-------+
  | hostname | bogon |
  +---------------+-------+
  1 row in set (0.00 sec)

 

从sql输出结果看,可以通过vip登陆,并且登陆了DB1服务器

 

2、创建一个数据库,然后在这个库重创建一个表,并插入数据

mysql> create database repldb;
Query OK, 1 row affected (0.02 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| repldb             |
| test               |
+--------------------+
5 rows in set (0.06 sec)

mysql> use repldb;
Database changed
mysql> create table repl_table(id int,email varchar(80),password varchar(40) not null);
Query OK, 0 rows affected (0.03 sec)

mysql> show tables;
+------------------+
| Tables_in_repldb |
+------------------+
| repl_table       |
+------------------+
1 row in set (0.01 sec)

mysql> insert into repl_table(id,email,password) values(1,"master@163.com","qweasd");
Query OK, 1 row affected (0.00 sec)

 

登陆DB2主机的mysql,可数据是否复制成功

mysql> show variables like "%hostname%";
+---------------+-----------------------+
| Variable_name | Value                 |
+---------------+-----------------------+
| hostname      | localhost.localdomain |
+---------------+-----------------------+
1 row in set (0.01 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| repldb             |
| test               |
+--------------------+
5 rows in set (0.05 sec)

mysql> use repldb;
Database changed
mysql> show tables;
+------------------+
| Tables_in_repldb |
+------------------+
| repl_table       |
+------------------+
1 row in set (0.00 sec)


mysql> select * from repl_table;
+------+----------------+----------+
| id   | email          | password |
+------+----------------+----------+
|    1 | master@163.com | qweasd   |
+------+----------------+----------+
1 row in set (0.08 sec)

3、停止DB1主机上的mysql,查看故障是否自动转移

[root@bogon ~]# service mysqld stop
Shutting down MySQL.. SUCCESS! 

 登陆192.168.2.33查看:

mysql> show variables like "%hostname%";
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    610
Current database: repldb

+---------------+-----------------------+
| Variable_name | Value                 |
+---------------+-----------------------+
| hostname      | localhost.localdomain |
+---------------+-----------------------+
1 row in set (0.01 sec)

可以看到现在登陆的是DB2 故障自动切换成功

接着,插入数据看DB1是否能复制

mysql> insert into repl_table(id,email,password) values(2,"slave@163.com","qweasd");
Query OK, 1 row affected (0.06 sec)

mysql> use repldb;
Database changed
mysql> select * from repl_table;
+------+----------------+----------+
| id   | email          | password |
+------+----------------+----------+
|    1 | master@163.com | qweasd   |
|    2 | slave@163.com  | qweasd   |
+------+----------------+----------+
2 rows in set (0.00 sec)

登陆DB1查看表数据

[root@bogon ~]# service mysqld start
Starting MySQL. SUCCESS! 
[root@bogon ~]# mysql -uroot -p
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.5.37-log Source distribution

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use repldb;
Database changed
mysql> select * from repl_table;
+------+----------------+----------+
| id   | email          | password |
+------+----------------+----------+
|    1 | master@163.com | qweasd   |
|    2 | slave@163.com  | qweasd   |
+------+----------------+----------+
2 rows in set (0.02 sec)

复制成功!

 

到此全部完成!!!

posted on 2016-10-26 10:49  青衫lys  阅读(9801)  评论(2编辑  收藏  举报