Kubernetes certification exam self-study series | Practical exercises - create mysql container

Book source: "CKA/CKAD Test Guide: From Docker to Kubernetes Complete Raiders"

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When using mysql mirroring, you need to specify at least one variable MYSQL_ROOT_PASSWORD to specify the root password. Other variables, such as MYSQL_USER, MYSQL_PASSWORD, and MYSQL_DATABASE are optional.

[root@vms100 ~]# docker history hub.c.163.com/library/mysql
IMAGE           CREATED        CREATED BY                          SIZE  COMMENT 
9e64176cd8a2    2 years ago    /bin/sh -c #(nop) CMD["mysqld"]     0 B  
...
[root@vms100 ~]#
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You can see that mysqld is running in the container created using the mysql image.

Step 1: Create a container.

[root@vms100 ~]# docker run -d --name=db --restart=always -e MYSQL_ROOT_PASSWORD=redhat -e MYSQL_DATABASE=blog hub.c.163.com/library/mysql 
debbb87bab89cc723807a3624189a357a6e38c492653482cc82f46032b9d6b18
[root@vms100 ~]#
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Here MYSQL_ROOT_PASSWORD is used to specify the MySQL root password as redhat, and a database is created in the container named blog (specified by the option -e MYSQL_DATABASE=blog).

Step 2: Do a connection test.

Use yum to install the mariadb client on the physical machine, the command is "yum -y install mariadb", and then connect to the container.

[root@vms100 ~]# mysql -uroot -predhat -h172.17.0.2
...
MySQL [(none)]> show databases；
+-------------------+
| Database          |
+-------------------+
| information_schema|
| blog              |
| mysql             |
| performance_schema|
| sys               |
+-------------------+
5 rows in set (0.00 sec)

MySQL [(none)]> exit 
Bye
[root@vms100 ~]#
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The IP of the container can be checked by the following command.

[root@vms100 ~]# docker exec db ip a | grep 'inet' #注意， inet后面有个空格
  inet 127.0.0.1/8 scope host lo 
  inet 172.17.0.2/16 scope global eth0
[root@vms100 ~]#