mysql 多主一从

一、主服务器准备

1.1、环境准备

两台主机器ip分别为

100.100.100.105 (主1)
100.100.100.106（主2）

安装 mysql

[root@centos ~]# yum install mysql-server mysql-client -y
[root@centos ~]# service mysqld start
[root@centos ~]# /usr/bin/mysqladmin -u root password '123456'

1.2、修改配置文件

100.100.100.105

[root@centos ~]# vim /etc/my.cnf
log-bin=mysql-bin
server-id=105

100.100.100.106

[root@centos ~]# vim /etc/my.cnf
log-bin=mysql-bin
server-id=106

1.3、添加mysql授权用户

mysql> grant replication slave on *.* to slave@'100.100.100.103' identified by '123456';

1.4、查看主服务器信息

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 |      261 |              |                  |
+------------------+----------+--------------+------------------+

mysql> show master status;
+------------------+----------+--------------+------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000003 |      261 |              |                  |
+------------------+----------+--------------+------------------+

二、从服务器准备

2.1、环境准备

从机器ip分别为

100.100.100.103

安装 mysql

[root@centos ~]# yum install mysql-server mysql-client -y
#这里我们不直接启动mysql，而是使用多进程的方法进行写分离。

2.2、编辑配置文件

[root@centos ~]# vim /etc/my.cnf

[mysqld_multi]
mysqld=/usr/bin/mysqld_safe
mysqladmin=/usr/bin/mysqladmin
log=/tmp/multi.log


[mysqld05]
port=3306
datadir=/var/lib/mysqla/
pid-file=/var/lib/mysqla/mysqld.pid
socket=/var/lib/mysqla/mysql.sock
user=mysql
server-id=20
#replicate-do-db=test
binlog-ignore-db=mysql
binlog-ignore-db=infogmation_schema


[mysqld06]
port=3307
datadir=/var/lib/mysqlb/
pid-file=/var/lib/mysqlb/mysqld.pid
socket=/var/lib/mysqlb/mysql.sock
user=mysql
server-id=20
#replicate-do-db=test
binlog-ignore-db=mysql
binlog-ignore-db=infogmation_schema

2.3、以不同的用户目录进行初始化

[root@centos ~]# mysql_install_db  --datadir=/var/lib/mysqla --user=mysql
[root@centos ~]# mysql_install_db  --datadir=/var/lib/mysqlb --user=mysql
[root@centos ~]# chown -R mysql /var/lib/mysqla/
[root@centos ~]# chown -R mysql /var/lib/mysqlb/

2.4、启动进程

[root@centos ~]# mysqld_multi --defaults-file=/etc/my.cnf start 05
[root@centos ~]# mysqld_multi --defaults-file=/etc/my.cnf start 06
[root@centos ~]# netstat -tunlp|grep mysqld
tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      1864/mysqld         
tcp        0      0 0.0.0.0:3307                0.0.0.0:*                   LISTEN      3563/mysqld 

2.5、登录子进程，进行配置

[root@centos ~]# mysql -uroot -P3306 -S /var/lib/mysqla/mysql.sock
mysql> change master to
master_user='slave',
master_password='123456',
master_host='100.100.100.105',
master_log_file='mysql-bin.000006',
master_log_pos=261;

mysql> start slave;

[root@centos ~]# mysql -uroot -P3307 -S /var/lib/mysqlb/mysql.sock
mysql> change master to
master_user='slave',
master_password='123456',
master_host='100.100.100.106',
master_log_file='mysql-bin.000003',
master_log_pos=261;

mysql> start slave;

2.5、出现如下，则成功

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 100.100.100.105
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000006
          Read_Master_Log_Pos: 261
               Relay_Log_File: mysqld-relay-bin.000002
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.000006
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes

mysql> show slave status\G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 100.100.100.106
                  Master_User: slave
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 261
               Relay_Log_File: mysqld-relay-bin.000002
                Relay_Log_Pos: 251
        Relay_Master_Log_File: mysql-bin.000003
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes