CentOS7基于Docker实现MySQL主从架构

环境准备
系统：CentOS 7.2 64位
mysql版本：5.7

1.安装Docker(略）
2.加载mysql镜像

docker pull mysql:5.7

3.添加主从数据库的配置文件
##新建目录和文件

mkdir -p /usr/local/mysqlData/master/cnf
mkdir -p /usr/local/mysqlData/master/data
mkdir -p /usr/local/mysqlData/slave/cnf
mkdir -p /usr/local/mysqlData/slave/data
touch /usr/local/mysqlData/master/cnf/mysql.cnf
touch /usr/local/mysqlData/slave/cnf/mysql.cnf

编辑 /usr/local/mysqlData/master/cnf/mysql.cnf

[mysqld]
pid-file    = /var/run/mysqld/mysqld.pid
socket    = /var/run/mysqld/mysqld.sock
datadir    = /var/lib/mysql

symbolic-links=0

character-set-server = utf8
#skip-networking
innodb_print_all_deadlocks = 1
max_connections = 2000
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 128
max_allowed_packet = 4M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 16M

read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 28M
key_buffer_size = 4M

thread_cache_size = 8

query_cache_type = 1
query_cache_size = 8M
query_cache_limit = 2M

ft_min_word_len = 4

log-bin = mysql-bin
server-id = 1
binlog_format = mixed

performance_schema = 0
explicit_defaults_for_timestamp

#lower_case_table_names = 1

interactive_timeout = 28800
wait_timeout = 28800

# Recommended in standard MySQL setup

sql_mode=NO_ENGINE_SUBSTITUTION,NO_AUTO_CREATE_USER,STRICT_TRANS_TABLES

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M

编辑/usr/local/mysqlData/slave/cnf/mysql.cnf

[mysqld]
pid-file    = /var/run/mysqld/mysqld.pid
socket    = /var/run/mysqld/mysqld.sock
datadir    = /var/lib/mysql

symbolic-links=0

character-set-server = utf8
#skip-networking
innodb_print_all_deadlocks = 1
max_connections = 2000
max_connect_errors = 6000
open_files_limit = 65535
table_open_cache = 128
max_allowed_packet = 4M
binlog_cache_size = 1M
max_heap_table_size = 8M
tmp_table_size = 16M

read_buffer_size = 2M
read_rnd_buffer_size = 8M
sort_buffer_size = 8M
join_buffer_size = 28M
key_buffer_size = 4M

thread_cache_size = 8

query_cache_type = 1
query_cache_size = 8M
query_cache_limit = 2M

ft_min_word_len = 4

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

performance_schema = 0
explicit_defaults_for_timestamp

#lower_case_table_names = 1

interactive_timeout = 28800
wait_timeout = 28800

# Recommended in standard MySQL setup

sql_mode=NO_ENGINE_SUBSTITUTION,NO_AUTO_CREATE_USER,STRICT_TRANS_TABLES

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
read_buffer = 4M
write_buffer = 4M

4.启用master和slave容器
##master容器启用

sudo docker run -itd -p 3307:3306 --name master -v /usr/local/mysqlData/master/cnf:/etc/mysql/conf.d -v /usr/local/mysqlData/master/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7

##进入master容器

sudo docker exec -it master /bin/bash
root@ebc7017a58ef:/#

##slave容器启用

docker run -itd -p 3308:3306 --name slave -v /usr/local/mysqlData/slave/cnf:/etc/mysql/conf.d -v /usr/local/mysqlData/slave/data:/var/lib/mysql -e MYSQL_ROOT_PASSWORD=123456 mysql:5.7

5.数据库开启远程访问

##设置master数据库访问权限

root@ebc7017a58ef:/# mysql -uroot -p123456
mysql>grant all privileges on *.* to morning@'%' identified by '123456' ;
Query OK, 0 rows affected (0.01 sec)
mysql>flush privileges;
Query OK, 0 rows affected (0.01 sec)

##设置slave数据库访问权限

root@ee3bb51b4d14:/# mysql -uroot -p123456
mysql>grant all privileges on *.* to morning@'%' identified by '123456';
Query OK, 0 rows affected (0.01 sec)

mysql>flush privileges;
Query OK, 0 rows affected (0.01 sec)

6.设置主从同步
##登录master数据库查看master状态

mysql> show master status;
+------------------+----------+--------------+------------------+-------------------+
| File             | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+------------------+----------+--------------+------------------+-------------------+
| mysql-bin.000003 |      204 |              |                  |                   |
+------------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)

mysql>

其中mysql-bin.000002为日志文件，后面会用到,记下来

##配置slave

mysql> change master to master_host='172.17.0.2',master_user='morning',master_password='123456',master_log_file='mysql-bin.000003',master_log_pos=204;

##参数说明

master_host，master数据库的ip地址，ip可以使用docker inspect 容器名 查看
master_user，连接master数据库的用户名
master_password，master_user的密码

##启动slave,slave的操作有几个，start,stop和restart

mysql> start slave;

##查看slave状态

mysql> show slave status;

mysql> show slave status \G;
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 172.17.0.2
                  Master_User: morning
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000003
          Read_Master_Log_Pos: 589
               Relay_Log_File: 24e9066f3980-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: 589
              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: 867c7d08-d6f9-11ea-9ee8-0242ac110002
             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)

结果。master

mysql> create database morning;
Query OK, 1 row affected (0.00 sec)

mysql> create database haha;
Query OK, 1 row affected (0.00 sec)

mysql>
slave查看

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| haha               |
| morning            |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
6 rows in set (0.00 sec)

mysql>