docker mysql 主从配置

docker安装运行单实例的MySQL参考另一篇文档 http://www.cnblogs.com/manger/p/7611309.html

1、首先在/data/script下创建两个文件my-m.cnf（主库配置） 、my-s.cnf（从库配置）
my-m.cnf 内容如下

[client]
port        =
socket      = /var/run/mysqld/mysqld.sock
[mysqld_safe]
pid-file    = /var/run/mysqld/mysqld.pid
socket      = /var/run/mysqld/mysqld.sock
nice        =
[mysqld]
user        = mysql
pid-file    = /var/run/mysqld/mysqld.pid
socket      = /var/run/mysqld/mysqld.sock
port        =
basedir     = /usr
datadir     = /var/lib/mysql
tmpdir      = /tmp
lc-messages-dir = /usr/share/mysql
explicit_defaults_for_timestamp
log-bin = mysql-bin
server-id =
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address   = 127.0.0.1
#log-error  = /var/log/mysql/error.log
# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

my-m.cnf

主要是这两行，只需要在原来的配置里面加上就行
log-bin = mysql-bin
server-id = 1

my-s.cnf内容如下

[client]
port        =
socket      = /var/run/mysqld/mysqld.sock
[mysqld_safe]
pid-file    = /var/run/mysqld/mysqld.pid
socket      = /var/run/mysqld/mysqld.sock
nice        =
[mysqld]
user        = mysql
pid-file    = /var/run/mysqld/mysqld.pid
socket      = /var/run/mysqld/mysqld.sock
port        =
basedir     = /usr
datadir     = /var/lib/mysql
tmpdir      = /tmp
lc-messages-dir = /usr/share/mysql
explicit_defaults_for_timestamp
log-bin = mysql-bin
server-id =
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address   = 127.0.0.1
#log-error  = /var/log/mysql/error.log
# Recommended in standard MySQL setup
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/

my-s.cnf

log-bin = mysql-bin
server-id = 2

2、OK，有了配置文件，就可以启动mysql了，先启动主库
docker run -d -e MYSQL_ROOT_PASSWORD=123456 --name mysql-master -v /data/script/my-m.cnf:/etc/mysql/my.cnf -p 3307:3306 mysql

3、启动从库
docker run -d -e MYSQL_ROOT_PASSWORD=123456 --name mysql-slave -v /data/script/my-s.cnf:/etc/mysql/my.cnf -p 3308:3306 mysql

4、连接主库，并运行以下命令，创建一个用户用来同步数据

想要访问docker的mysql数据库，我的机器上需要装一个mysql-client。
yum install mysql -y

mysql -h192.168.1.20 -P3307 -uroot -p123456
mysql> GRANT REPLICATION SLAVE ON *.* to 'repl'@'%' identified by 'repl';

5、查看主库状态
mysql> show master status;

mysql> show master status;

记住File、Position的值，如果没查到数据，请检查第一、第二步，配置问题。
我查出来的是mysql-bin.000003、940

6、连接到从库，运行以下命令，设置主库链接

mysql -h192.168.1.20 -P3308 -uroot -p123456
mysql> change master to master_host='192.168.1.20',master_user='repl',master_password='repl',
master_log_file='mysql-bin.000003',master_log_pos=940,master_port=3307;

7、启动同步
mysql> start slave;

8、查看同步状态
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.1.20
                  Master_User: repl
                  Master_Port: 3307
                Connect_Retry: 10
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 940
               Relay_Log_File: relay-bin.000002
                Relay_Log_Pos: 320
        Relay_Master_Log_File: mysql-bin.000003
             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: 940
              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: 42aa1711-a46e-11e7-945d-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)
如果看到2个yes，说明主从搭建成功