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$ docker pull mysql:5.7
mysql主服务 端口3307,密码rootmysql
$ docker run -p 3307:3306 --name mysql_master -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7
mysql从服务 端口3308,密码rootsql
$ docker run -p 3308:3306 --name mysql_slave -e MYSQL_ROOT_PASSWORD=root -d mysql:5.7
进入主服务容器docker
$ docker exec -it a00792eaeeb4 /bin/bash
找到配置文件目录数据库
$ cd /etc/mysql/mysql.conf.d
安装vimmacos
修改配置bash
$ vim mysqld.cnf
[mysqld] pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = /var/lib/mysql #log-error = /var/log/mysql/error.log # By default we only accept connections from localhost #bind-address = 127.0.0.1 # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 #新添加的配置 server-id = 1 log-bin = mysql-bin binlog-format = mixed
保存后重启mysql服务、重启容器socket
$ service mysql restart $ docker restart a00792eaeeb4
建立一个同步复制的用户slave,密码为123456,授予用户slave REPLICATION SLAVE
权限和REPLICATION CLIENT
权限,该用户用于在主从库之间同步数据。测试
mysql> CREATE USER 'slave'@'%' IDENTIFIED BY '123456'; mysql> GRANT REPLICATION SLAVE, REPLICATION CLIENT ON *.* TO 'slave'@'%';
查看配置状态
mysql> show master status; +------------------+----------+--------------+------------------+-------------------+ | File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set | +------------------+----------+--------------+------------------+-------------------+ | mysql-bin.000001 | 435 | | | | +------------------+----------+--------------+------------------+-------------------+ 1 row in set (0.00 sec)
记下这里的位置:435,在下面数据同步时要用到
一样进入容器,编辑/etc/mysql/mysql.conf.d/mysqld.cnf
[mysqld] pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock datadir = /var/lib/mysql #log-error = /var/log/mysql/error.log # By default we only accept connections from localhost #bind-address = 127.0.0.1 # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 #新加的内容 server-id = 2
保存后重启容器
$ docker restart 2061a7aaa728
先查询Master服务的ip地址
$ docker inspect --format='{{.NetworkSettings.IPAddress}}' a00792eaeeb4 172.17.0.2
而后进入Slave服务,开始配置数据同步
$ docker exec -it 2061a7aaa728 /bin/bash $ mysql -uroot -proot
先中止从服务的slave,
mysql> stop slave; Query OK, 0 rows affected, 1 warning (0.00 sec)
拿到从上面Master的位置435,执行:
mysql> change master to master_host='172.17.0.2', master_user='slave', master_password='123456', master_port=3306, master_log_file='mysql-bin.000001', master_log_pos= 435;
而后再启动slave,开启同步
mysql> start slave;
解释
CHANGE MASTER TO MASTER_HOST='172.17.0.2',//主服务的IP地址 master_port=3306,//主服务的服务端口 MASTER_USER='slave',//主服务用户 MASTER_PASSWORD='123456',//主服务用户密码 MASTER_LOG_FILE='mysql-bin.000001',//日志文件 MASTER_LOG_POS=435;//日志位置
这个时候,查看SLave服务的slave状态:
mysql> show slave status\G; *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: 172.17.0.2 Master_User: slave Master_Port: 3306 Connect_Retry: 30 Master_Log_File: mysql-bin.000001 Read_Master_Log_Pos: 435 Relay_Log_File: dbc647dfde50-relay-bin.000002 Relay_Log_Pos: 515 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: 435 Relay_Log_Space: 729 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: 1af39b3e-13d2-11e9-ae89-0242ac110002 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)
若是显示 Slave_IO_Running: Yes
,Slave_SQL_Running: Yes
,那么说明配置成功。
若是失败,可能缘由是:
docker inspect --format='{{.NetworkSettings.IPAddress}}' 容器id
来查询ip地址show master status;
来获取日志名和位置在Master服务新建数据库test
CREATE DATABASE `test` DEFAULT CHARACTER SET = `utf8mb4`;
而后查看Slave服务
mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | sys | | test | +--------------------+ 5 rows in set (0.00 sec)
在Master服务建个表user
CREATE TABLE `user` ( `id` int(11) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(20) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
查看从服务Slave:
mysql> use test; Database changed mysql> show tables; +----------------+ | Tables_in_test | +----------------+ | user | +----------------+ 1 row in set (0.00 sec)
在Master新加数据,查看Slave
若是在Master服务增删改数据,都会同步到Slave。可是若是在Slave修改数据后,没法同步到Master,而且日志文件会错乱(Slave除非从新设置日志文件位置),致使数据没法完成同步。因此通常Master服务给读写权限,而Slave只须要读权限,禁止写入数据。