MySQL---主从复制

1.1 mysql主从复制:

环境规划:集群中原有的db01服务器作为数据库主服务器,由于笔记本空间问题这里把backup备份服务器作为从服务器,不在安装新的机器,节省点空间,在backup服务器上部署好mysql即可

说明:实现主从复制的前提是两台服务器的时间同步要一致,前面ntp时间服务器已经搭建好,这里则不存在此问题

1.1.1 主服务器配置:

1. 修改配置文件

[root@db01 ~]# tail /etc/my.cnf

server_id = 1

log-bin=master-bin

log-slave-updates=true

2. 重启数据库

[root@db01 ~]# /etc/init.d/mysqld restart

3. 进入主数据库进行授权

mysql> grant replication slave on *.* to 'myslave'@'172.16.1.0/255.255.255.0' identified by 'oldboy123';

Query OK, 0 rows affected (0.00 sec)

4. 显示position信息,一遍在从服务器端进行更改

mysql> show master status;

+-------------------+----------+--------------+------------------+-------------------+

+-------------------+----------+--------------+------------------+-------------------+

| master-bin.000001 | 120 | | | |

+-------------------+----------+--------------+------------------+-------------------+

1 row in set (0.00 sec)

1.1.2 从服务器配置:

1. 修改配置文件

[root@backup bin]# tail /etc/my.cnf

server_id = 2

relay-log=relay-log-bin

relay-log-index=slave=relay-bin.index

2. 启动mysql服务

3. 按照主服务器配置master-log-file 和 master—log-pos参数

mysql> change master to master_host='172.16.1.51',master_user='myslave',master_password='oldboy123',master_log_file='master-bin.000001',master_log_pos=120;

Query OK, 0 rows affected, 2 warnings (0.07 sec)

mysql> start slave;

Query OK, 0 rows affected (0.04 sec)

mysql> show slave status\G

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 172.16.1.51

Master_User: myslave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: master-bin.000002

Read_Master_Log_Pos: 120

Relay_Log_File: relay-log-bin.000002

Relay_Log_Pos: 284

Relay_Master_Log_File: master-bin.000002

Slave_IO_Running: Yes

Slave_SQL_Running: Yes 必须全为yes证明主从复制配置成功

1.1.3 遇到报错: 查看slave状态时显示Slave_IO_Running: No

在查看从库端查看slave状态时显示IO为no

mysql> show slave status\G

*************************** 1. row ***************************

Slave_IO_State:

Master_Host: 172.16.1.51

Master_User: myslave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: master-bin.000001

Read_Master_Log_Pos: 1645

Relay_Log_File: relay-log-bin.000001

Relay_Log_Pos: 4

Relay_Master_Log_File: master-bin.000001

Slave_IO_Running: No

Slave_SQL_Running: Yes

这主要是以为在主库端的file和pos值和从库端设置不同所导致,解决方案如下:

master端:

1. 重新启动数据库服务

[root@db01 ~]# /etc/init.d/mysqld restart

Shutting down MySQL.. SUCCESS!

Starting MySQL.... SUCCESS!

2. 查看file和pos值

mysql> show master status;

+-------------------+----------+--------------+------------------+-------------------+

+-------------------+----------+--------------+------------------+-------------------+

| master-bin.000002 | 120 | | | |

+-------------------+----------+--------------+------------------+-------------------+

1 row in set (0.02 sec)

slave端:

1. 进入数据库,停止slave

mysql> stop slave;

Query OK, 0 rows affected (0.02 sec)

2. 重新写入file和pos值:

mysql> change master to master_log_file='master-bin.000002',master_log_pos=120;

Query OK, 0 rows affected (0.04 sec)

3. 启动slave:

mysql> start slave;

Query OK, 0 rows affected (0.03 sec)

4. 查看slave状态

mysql> show slave status\G

*************************** 1. row ***************************

Slave_IO_State: Waiting for master to send event

Master_Host: 172.16.1.51

Master_User: myslave

Master_Port: 3306

Connect_Retry: 60

Master_Log_File: master-bin.000002

Read_Master_Log_Pos: 120

Relay_Log_File: relay-log-bin.000002

Relay_Log_Pos: 284

Relay_Master_Log_File: master-bin.000002

Slave_IO_Running: Yes

Slave_SQL_Running: Yes

1.1.4 进行测试:

1. 在master端创建数据库

mysql> create database jiang;

Query OK, 1 row affected (0.03 sec)

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| dedecms |

| discuz |

| jiang |

| mysql |

| performance_schema |

| test |

| test2 |

| test3 |

| wordpress |

+--------------------+

10 rows in set (0.01 sec)

2. 在slave端查看数据库:

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| jiang | mysql主从复制配置成功!

| mysql |

| performance_schema |

| test |

+--------------------+

5 rows in set (0.00 sec)

转载于:https://blog.51cto.com/13520772/2085164