Docker容器化部署应用保姆级教程(一)——MySQL

2023年 10月 7日 41.2k 0

参考资料:hub.docker.com/_/mysql

几点说明:

MySQL5.7 和MySQL8.0在构建方面会有些细节不同,这里以MySQL8.0进行部署

单机MySQL部署

1. 拉取镜像

docker pull mysql

2. 准备好挂载的目录和文件

在使用docker -v来挂载时如果是目录,在宿主机上可以不用提前创建好,docker会自动创建,但是如果是文件需要提前准备好,比如 -v /opt/mysql/log/mysqld.log:/var/log/mysqld.log 我们实质上是想把docker 中的mysqld.log文件挂载到对应的宿主机上,由于宿主机上没有mysqld.log这个文件,这样直接写docker会把mysqld.log当作文件夹然后创建,与此同时,docker中的mysqld.log 这个文件是存在的,导致的结果是把docker中的mysqld.log 文件挂载到宿主机上的mysqld.log 文件夹上,从而报错。

所以我们提前把这个文件准备好

[root@localhost ~]# mkdir -p /opt/mysql/log
[root@localhost ~]# touch /opt/mysql/log/mysqld.log
[root@localhost ~]# cd /opt/mysql/log/
[root@localhost log]# ls
mysqld.log

3. 基于镜像构建 MySQL 容器

docker run -d --name mysql_8.0 -p 3306:3306 
 -v /opt/mysql/log/mysqld.log:/var/log/mysqld.log 
 -v /opt/mysql/mysql/:/var/lib/mysql 
 -v /opt/mysql/conf.d/:/etc/mysql/conf.d 
 -e MYSQL_ROOT_PASSWORD=root 
 mysql

运行命令后,成功构建出MySQL容器实例

命令解释:

(1)/var/log/mysqld.log是mysql的日志文件

(2)/var/lib/mysql mysql数据存储的地方

(3)/opt/mysql/conf.d mysql配置文件存储的地方

关于挂载mysql配置文件稍微说明下:

在hub.docker.com/_/mysql上介绍说… /etc/mysql/my.cnf 和 /etc/mysql/conf.d/config-file.cnf 中的组合启动设置,后者的设置优先。而本文章就直接使用了/etc/mysql/conf.d/作为配置文件目录进行挂载,在后面会创建config-file.cnf 文件。

为什么不选择 /etc/mysql/my.cnf 作为配置文件使用? 主要有以下几点:

(1)我在没有挂载任何目录的情况下以最简单的方式启动一个容器,进入容器里面,发现在/etc/mysql这个目录中没有my.cnf文件,在/etc/mysql/conf.d目录中也没有config-file.cnf文件,我猜想都需要我们自己创建

(2)但是在/etc 目录下有my.cnf文件 打开一看,在配置文件最后一行有:!includedir /etc/mysql/conf.d/

所以我猜想启动 MySQL 容器实例后会使用/etc/my.cnf作为默认的配置文件,同时会组合使用 /etc/mysql/conf.d/ 目录下的配置文件,同时我猜想对于 /etc/mysql/conf.d/ 目录下的配置文件应该必须以. cnf 作为后缀(猜想,没试验) ,所以我不清楚会不会使用 /etc/mysql/my.cnf 作为配置文件,我也没试验。

主从集群

主从集群的部署和单机部署,就是多部署几个实例,然后再做一些额外的配置。

主MySQL部署配置

1. 部署主MySQL

docker run -d --name mysql-master -p 3307:3306 
 -v /opt/mysql-master/log/mysqld.log:/var/log/mysqld.log 
 -v /opt/mysql-master/mysql/:/var/lib/mysql 
 -v /opt/mysql-master/conf.d/:/etc/mysql/conf.d 
 -e MYSQL_ROOT_PASSWORD=root 
 mysql

注意2点:

(1)端口映射不要再使用3306了,在部署单机的时候已经被使用掉了

(2)和部署单机一样,提前把/opt/mysql-master/log/mysqld.log文件创建出来

2. 配置主MySQL

(1)/opt/mysql-master/conf.d/ 目录下创建config-file.cnf 文件,填写下面内容

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
skip-name-resolve

server_id=1
log-bin=mysql-bin
read-only=1
binlog-do-db=master_slave_test

replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema
  • server_id=1 在主从集群架构下,每个MySQL实例的server_id不能相同 为整数

  • binlog-do-db=master_slave_test 表示我们哪个数据库要进行主从复制

vi /opt/mysql-master/conf.d/config-file.cnf

(2)进入到主mysql客户端,在主mysql上创建一个用户,并给它配置replication slave权限,最后退出重启服务

[root@localhost log]# docker exec -it mysql-master mysql -uroot -proot
mysql: [Warning] Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 8
Server version: 8.1.0 MySQL Community Server - GPL

Copyright (c) 2000, 2023, Oracle and/or its affiliates.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.

mysql>  CREATE USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY '123456';
Query OK, 0 rows affected (0.01 sec)

mysql> grant replication slave on *.* to 'slave'@'%';
Query OK, 0 rows affected (0.01 sec)

mysql> exit
Bye
[root@localhost log]# docker restart mysql-master
mysql-master
[root@localhost log]#

使用 CREATE USER 'slave'@'%' IDENTIFIED WITH mysql_native_password BY '123456'; 创建slave用户并配置123456密码时,使用了WITH mysql_native_password参数,表示直接可以使用密码进行连接,不然的话后面在从mysql中直接使用密码进行连接会出问题

或者可以直接在配置文件config-file.cnf(my.cnf)进行修改

[mysqld]

default_authentication_plugin=mysql_native_password

官方参考:dev.mysql.com/doc/refman/…

(3)关键一步,进入主mysql,show master statusG 查看状态

至此,主MySQL的部署和配置已经完成了!

从MySQL部署和配置

1. 部署从MySQL

docker run -d --name mysql-slave -p 3308:3306 
 -v /opt/mysql-slave/log/mysqld.log:/var/log/mysqld.log 
 -v /opt/mysql-slave/mysql/:/var/lib/mysql 
 -v /opt/mysql-slave/conf.d/:/etc/mysql/conf.d 
 -e MYSQL_ROOT_PASSWORD=root 
 mysql

同样注意2点:

(1)端口映射不要再使用3306和3307了,在部署单机和主MySQL的时候已经被使用掉了

(2)和部署单机一样,提前把/opt/mysql-slave/log/mysqld.log文件创建出来

2. 配置从MySQL

(1)/opt/mysql-slave/conf.d/ 目录下创建config-file.cnf 文件,内容和在配置主MySQL的一样,只不过需要注意把server_id修改成2,不能和主MySQL一样

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

[mysqld]
init_connect='SET collation_connection = utf8_unicode_ci'
init_connect='SET NAMES utf8'
character-set-server=utf8
collation-server=utf8_unicode_ci
skip-character-set-client-handshake
skip-name-resolve

server_id=2
log-bin=mysql-bin
read-only=1
binlog-do-db=master_slave_test

replicate-ignore-db=mysql
replicate-ignore-db=sys
replicate-ignore-db=information_schema
replicate-ignore-db=performance_schema

  • 添加完配置文件之后重启,然后进入到从MySQL的客户端,使用如下命令连接主MySQL
  • change master to master_host='172.17.0.3', master_user='slave', master_password='123456', master_log_file='mysql-bin.000002', master_log_pos=157, master_port=3306;
    

    (1)master_host='172.17.0.3’ master_port=3306 表示我们连接的主mysql的IP和端口,可以使用docker inspect mysql-master查看自己的主MySQL的IP

    (2)master_user='slave', master_password='123456' 表示连接主mysql使用的用户和密码,就是我们之前在主MySQL上配置的

    (3)master_log_file='mysql-bin.000001', master_log_pos=608 要和对应的主mysql一致,进入到自己的主MySQL使用 show master statusG 查看

    执行连接,然后再使用 start slave 命令启动主从复制服务 再使用 show slave statusG 查看状态

    [root@localhost ~]# docker exec -it mysql-slave mysql -uroot -proot
    mysql: [Warning] Using a password on the command line interface can be insecure.
    Welcome to the MySQL monitor.  Commands end with ; or g.
    Your MySQL connection id is 9
    Server version: 8.1.0 MySQL Community Server - GPL
    
    Copyright (c) 2000, 2023, Oracle and/or its affiliates.
    
    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.
    
    Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
    
    mysql> change master to master_host='172.17.0.3', master_user='slave', master_password='123456', master_log_file='mysql-bin.000002', master_log_pos=157, master_port=3306;
    Query OK, 0 rows affected, 9 warnings (0.03 sec)
    
    mysql> start slave;
    Query OK, 0 rows affected, 1 warning (0.02 sec)
    
    mysql> show slave statusG
    *************************** 1. row ***************************
                   Slave_IO_State: Waiting for source to send event
                      Master_Host: 172.17.0.3
                      Master_User: slave
                      Master_Port: 3306
                    Connect_Retry: 60
                  Master_Log_File: mysql-bin.000002
              Read_Master_Log_Pos: 157
                   Relay_Log_File: 7cbfc79bcf01-relay-bin.000002
                    Relay_Log_Pos: 326
            Relay_Master_Log_File: mysql-bin.000002
                 Slave_IO_Running: Yes
                Slave_SQL_Running: Yes
                  Replicate_Do_DB:
              Replicate_Ignore_DB: mysql,sys,information_schema,performance_schema
               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: 157
                  Relay_Log_Space: 543
                  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: 05680767-64e2-11ee-9f2d-0242ac110003
                 Master_Info_File: mysql.slave_master_info
                        SQL_Delay: 0
              SQL_Remaining_Delay: NULL
          Slave_SQL_Running_State: Replica has read all relay log; waiting for more updates
               Master_Retry_Count: 10
                      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:
           Master_public_key_path:
            Get_master_public_key: 0
                Network_Namespace:
    1 row in set, 1 warning (0.00 sec)
    
    mysql>
    

    至此,从MySQL已经部署和配置完了,并且成功连上主MySQL,开启了主从复制服务。

    验证主从集群可用

    进入到主mysql中,创建master_slave_test数据库(配置文件中指定的主从复制数据库名称),然后创建user表,添加几条记录,查看从MySQL是否有数据

    1. 主MySQL

    [root@localhost log]# docker exec -it mysql-master mysql -uroot -proot
    mysql: [Warning] Using a password on the command line interface can be insecure.
    Welcome to the MySQL monitor.  Commands end with ; or g.
    Your MySQL connection id is 8
    Server version: 8.1.0 MySQL Community Server - GPL
    
    Copyright (c) 2000, 2023, Oracle and/or its affiliates.
    
    Oracle is a registered trademark of Oracle Corporation and/or its
    affiliates. Other names may be trademarks of their respective
    owners.
    
    Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
    
    mysql> show master statusG
    *************************** 1. row ***************************
                 File: mysql-bin.000002
             Position: 157
         Binlog_Do_DB: master_slave_test
     Binlog_Ignore_DB:
    Executed_Gtid_Set:
    1 row in set (0.00 sec)
    
    mysql> create database master_slave_test;
    Query OK, 1 row affected (0.01 sec)
    
    mysql> use master_slave_test;
    Database changed
    mysql> CREATE TABLE `user`  (   `id` int NOT NULL AUTO_INCREMENT,   `name` varchar(125) CHARACTER SET utf8mb3 COLLATE utf8mb3_unicode_ci NULL DEFAULT NULL,   `age` int NULL DEFAULT NULL,   PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8mb3 COLLATE = utf8mb3_unicode_ci ROW_FORMAT = Dynamic;
    Query OK, 0 rows affected, 4 warnings (0.04 sec)
    
    mysql> select * from user;
    Empty set (0.02 sec)
    
    mysql> INSERT INTO `user` VALUES (1, 'zhangsan', 18);
    Query OK, 1 row affected (0.01 sec)
    
    mysql> select * from user;
    +----+----------+------+
    | id | name     | age  |
    +----+----------+------+
    |  1 | zhangsan |   18 |
    +----+----------+------+
    1 row in set (0.00 sec)
    

    2. 从MySQL查看

    完结。

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