MySQL(6)--复制,docker容器中

MySQL5.7.11实现replication
启动两个安装好mysql的空的docker image
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shell1 master
$docker run -it wonder4/mysql5.7
root# service mysql start
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shell2 slave
$docker run -it wonder4/mysql5.7_1
root# service mysql start
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docker1配置master
mysql $ sudo vi /etc/my.cnf
[mysqld]
log-bin=/opt/mysql/data/mysql-bin
server-id=1
mysql $ service mysql restart
创建单独的复制用户
mysql $ mysql -uroot
mysql> create user 'repl'@'%' identified by 'repl';
mysql> grant replication slave on *.* to 'repl'@'%';
锁表
mysql> flush tables with read lock;
mysql> show master status;
记住file和position
这期间可以使用几种方法复制数据库快照
$ mysqldump --all-databases --master-data > dbdump.db
使用拷贝数据文件的方式创建快照
mysql> unlock tables; 解锁表

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配置mysql slave
$ sudo vi /etc/my.cnf
[mysqld]
server-id=2
$ service mysql restart
$ mysql -uroot
mysql> stop slave;
mysql> CHANGE MASTER TO MASTER_HOST='172.17.0.2',MASTER_USER='repl',MASTER_PASSWORD='repl',MASTER_LOG_FILE='mysql-bin.000001',MASTER_LOG_POS=595;
注意最后两个值，需要从前一步中获得
mysql> start slave;
mysql> show slave status\G; 有错误会在下面信息中显示出来
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: 172.17.0.2
Master_User: repl
Master_Port: 3306
Connect_Retry: 60
Master_Log_File: mysql-bin.000001
Read_Master_Log_Pos: 933
Relay_Log_File: 34a1ba8596f0-relay-bin.000005
Relay_Log_Pos: 320
Relay_Master_Log_File: mysql-bin.000001
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:
Last_Errno: 0
Last_Error:
Skip_Counter: 0
Exec_Master_Log_Pos: 933
Relay_Log_Space: 534
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: 4112c39a-fbd0-11e5-91ee-0242ac110002
Master_Info_File: /opt/mysql/data/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)

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需要注意：
1.防火墙要开放指定端口
2.如果是docker commit复制相同的image，需要修改uuid
/opt/mysql/data/auto.cnf 修改其中的server-uuid，改为不同的值即可
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tips:
1.可以从低版本到高版本复制，例如master是5.5可以复制到slave是5.6，但也要看具体的情况，例如create table .... select语句在5.6就不再支持
2.两个主版本的binlog格式可能会存在差异
3.在不同引擎上的行为和不同对象上的复制，需要参考文档