一路走来，因为不懂，一大堆问题，感谢网上帖子帮忙
环境CentOS 7.2, mysql 5.7
主 192.168.1.101
从 192.168.1.102
- 一. MySQL主服务器配置
1.建立用户
grant replication slave on *.* to rep1@192.168.1.102 identified by 'Welcome1';
# grant replication slave on *.* to ‘用户名’@'主机’ identified by ‘密码’;
# 可在B Slave上做连接测试: mysql -h 192.168.8.101 -urep1 -p
2.编辑配置文件/etc/my.cnf
# 确保有如下行
server-id = 1
log-bin=mysql-bin
binlog-do-db=test
binlog-ignore-db=mysql
#binlog-do-db=需要备份的数据库名，可写多行
#binlog-ignore-db=不需要备份的数据库名，可写多行
- 二.MySQL从服务器配置
编辑/etc/my.cnf
server-id=2
log-bin=mysql-bin
replicate-do-db=test
# replicate-do-db=test 需要备份的数据库名
# replicate-ignore-db=mysql 忽略的数据库
# master-connect-retry=60 如果从服务器发现主服务器断掉，重新连接的时间差(秒)
修改配置需要注意，需要删除从服务器上的/var/lib/mysql/master.info文件
[root@CentOS-2 ~]# rm -f /var/lib/mysql/master.info
[root@CentOS-2 ~]# /etc/init.d/mysql restart
如果启动失败，需要删除/var/lib/mysql(数据目录下)所有数据，然后用root登录mysql, 通过命令指定master
change master to master_host='192.168.1.101', master_user='rep1', master_password='Welcome1';
如果在从库上登录运行
mysql> show master status;
ERROR 1227 (42000): Access denied; you need the SUPER,REPLICATION CLIENT privilege for this operation
可在主库上授权
mysql> select * from mysql.user where user='rep1';
grant super on *.* to rep1@192.168.6.102;
用root登录从服务器查看复制状态是否启动
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State:
Master_Host: 192.168.1.101
Master_User: rep1
Master_Port: 3306
Connect_Retry: 60
Master_Log_File:
Read_Master_Log_Pos: 4
Relay_Log_File: slaver1-relay-bin.000001
Relay_Log_Pos: 4
Relay_Master_Log_File:
Slave_IO_Running: No
Slave_SQL_Running: No
Replicate_Do_DB: test
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 0
Relay_Log_Space: 154
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: NULL
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: 0
Master_UUID:
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State:
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
其中Slave_IO_Running 与 Slave_SQL_Running 的值都必须为YES，才表明状态正常。
在主库上查询
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000001 | 342 | test | mysql | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.09 sec)
在从库上执行
mysql> stop slave;
Query OK, 0 rows affected, 1 warning (0.03 sec)
mysql> change master to master_log_file='mysql-bin.000001',master_log_pos=342;
Query OK, 0 rows affected (0.02 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: 192.168.1.101
Master_User: rep1
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 342
Relay_Log_File: slaver1-relay-bin.000002
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000001
Slave_IO_Running: Yes
Slave_SQL_Running: Yes
Replicate_Do_DB: test
Replicate_Ignore_DB:
Replicate_Do_Table:
Replicate_Ignore_Table:
Replicate_Wild_Do_Table:
Replicate_Wild_Ignore_Table:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 342
Relay_Log_Space: 529
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
Master_UUID: e373e210-c94c-11e7-aea0-080027e2ae0a
Master_Info_File: /var/lib/mysql/master.info
SQL_Delay: 0
SQL_Remaining_Delay: NULL
Slave_SQL_Running_State: Slave has read all relay log; waiting for more updates
Master_Retry_Count: 86400
Master_Bind:
Last_IO_Error_Timestamp:
Last_SQL_Error_Timestamp:
Master_SSL_Crl:
Master_SSL_Crlpath:
Retrieved_Gtid_Set:
Executed_Gtid_Set:
Auto_Position: 0
Replicate_Rewrite_DB:
Channel_Name:
Master_TLS_Version:
1 row in set (0.00 sec)
ERROR:
No query specified
主库上建表测试
mysql> create database test;
Query OK, 1 row affected (0.01 sec)
mysql> use test;
Database changed
mysql> create table first_tb(id int(3),name char(10));
Query OK, 0 rows affected (0.04 sec)
mysql> insert into first_tb values (001,'myself');
Query OK, 1 row affected (0.01 sec)
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| first_tb |
+----------------+
1 row in set (0.00 sec)
从库验证
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql> use test;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+----------------+
| Tables_in_test |
+----------------+
| first_tb |
+----------------+
1 row in set (0.00 sec)
mysql> select * from first_tb;
+------+--------+
| id | name |
+------+--------+
| 1 | myself |
+------+--------+
1 row in set (0.00 sec)