How to install wordpress by docker?

Hi, Junius

Follow detail information that I follow official docker install guide, you can check that:

[root@frank-vps my_wordpress]# more docker-compose.yml
version: '3'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: somewordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     ports:
       - "8000:80"
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD: wordpress
volumes:
    db_data:
    [root@frank-vps my_wordpress]#
    [root@frank-vps my_wordpress]# docker ps
    CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS                  NAMES
    91f3d090a116        wordpress:latest    "docker-entrypoint..."   26 hours ago        Up 26 hours         0.0.0.0:8000->80/tcp   mywordpress_wordpress_1
    b116d0cf4c67        mysql:5.7           "docker-entrypoint..."   26 hours ago        Up 26 hours         3306/tcp               mywordpress_db_1
[root@frank-vps my_wordpress]# curl localhost:8000
[root@frank-vps my_wordpress]#
[root@frank-vps my_wordpress]#