目录
1、拉取mysql 。
2、创建容器并运行:
创建主数据库:
创建从数据库:
1、拉取mysql 。
我这拉取的是mysql 5.7
docker pull mysql:5.7
2、创建容器并运行:
创建主数据库:
docker run -p 3307:3306 --name mysql-master \
-v /work/mysql-master/data:/var/lib/mysql \
-v /work/mysql-master/conf:/etc/mysql/conf.d \
-v /work/mysql-master/logs:/var/log/mysql \
-e MYSQL_ROOT_PASSWORD=123456 \
-d 9cfcce23593a
命令解释:
-p : 端口映射 即把宿主机的3307端口映射到容器的3306端口
--name 容器名称
-v 挂载文件 这里主要吧 配置文件、数据、日志挂载在宿主机上。因为容器内的数据会随着容器的删除而删除,如果挂载在宿主机上。容器删除,数据还在。
-e 指定密码
-d 容器后台运行,并返回容器id
然后配置mysql配置文件,因为我们已经把配置文件映射到/work/mysql-master/conf目录。那么我们直接在这里修改即可:
创建文件my.cnf内容如下:
[mysqld]
server-id=1 ## 唯一server id
log-bin=mysql-bin ## 开启二进制日志
lower_case_table_names =1
character-set-server=utf8
sql-mode=ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8
然后重启容器。容器启动会 ,进入容器:
docker exec -it 容器id /bin/bash
登录mysql 密码为创建容器时指定密码。然后执行:
grant replication slave on *.* to 'master'@'%' identified by '123456';
flush privileges;
mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.00002 | 154 | | | |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
这里需要记住这个File和Position属性的值,因为下面在配置slave的时候需要用到。
创建从数据库:
基本和创建主数据库一致.
docker run -p 3308:3306
--name mysql-slave1
-v /work/mysql-slave1/data:/var/lib/mysql
-v /work/mysql-slave1/conf:/etc/mysql/conf.d
-v /work/mysql-slave1/logs:/var/log/mysql
--link mysql-master:master
-e MYSQL_ROOT_PASSWORD=123456
-d 9cfcce23593a
区别:
--link --link参数,其后指定了当前容器所要连接的容器,mysql-master表示所要连接的容器的名称,master表示为该容器起的一个别名,通俗来讲,就是slave容器通过这两个名称都可以访问到master容器。这么做的原因在于,如果master与slave不在同一个docker network中,那么这两个容器相互之间是没法访问的。
配置mysql文件:
[mysqld]
server-id=2
log-bin=mysql-slave1-bin
relay_log=slave1-mysql-relay-bin
lower_case_table_names =1
character-set-server=utf8
sql-mode=ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
[client]
default-character-set=utf8
[mysql]
default-character-set=utf8
然后重启容器,进入容器,连接主数据库。执行以下命令:
change master to master_host='master', master_user='master', master_password='123456', master_port=3306, master_log_file='mysql-bin.00002', master_log_pos=591, master_connect_retry=30;
这里需要注意:master_port 是指容器mysql的端口,并不是映射端口。
然后:
start slave;
mysql> show master status;
+-------------------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+-------------------------+----------+--------------+------------------+-------------------+
| mysql-slave2-bin.000002 | 154 | | | |
+-------------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> start slave;
Query OK, 0 rows affected (0.03 sec)
mysql> show slave status\G;
*************************** 1. row ***************************
Slave_IO_State: Waiting for master to send event
Master_Host: master
Master_User: master
Master_Port: 3306
Connect_Retry: 30
Master_Log_File: mysql-bin.000002
Read_Master_Log_Pos: 878
Relay_Log_File: slave2-mysql-relay-bin.000004
Relay_Log_Pos: 1091
Relay_Master_Log_File: mysql-bin.000002
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: 878
Relay_Log_Space: 2677
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: 41b38f79-d952-11ea-b298-0242ac110003
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)
这里只要看到两个参数Slave_IO_Running
和Slave_SQL_Running
都为true,则表示复制是正常进行的。
如果报错:
Got fatal error 1236 from master when reading data from binary log: 'Could not find first log file n
那么执行:
stop slave;
reset slave;
start slave;
然后执行 :
show slave status\G;
测试
最后在主数据库中新增一条数据可以看到,在从数据库中也有相同的一条数据,即说明成功开启主从复制!