$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2

 $ sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
 $ sudo yum install docker-ce
 $ sudo systemctl start docker
 $ docker --version
 $ sudo docker run hello-world

$ sudo curl -L https://github.com/docker/compose/releases/download/1.17.0/docker-compose-`uname -s`-`uname -m` -o /usr/bin/docker-compose
$ sudo chmod +x /usr/bin/docker-compose
$ docker-compose --version

$ mkdir ./blog
$ cd blog
$ sudo vim docker-compose.yml

version: '3'

services:
 db:
  image: mysql:5.7
  volumes: # 數據卷，映射本地文件夾
  - db_data:/var/lib/mysql
  ports: # 如果不寫端口映射的話，外部無法連接該mysql（下方WordPress連接沒問題）
  - "3306:3306"                       
  restart: always
  environment:
  MYSQL_ROOT_PASSWORD: xxx
  MYSQL_DATABASE: wordpress
  MYSQL_USER: wordpress
  MYSQL_PASSWORD: wordpress

 wordpress:
  depends_on: # 依賴上方的 db service
  - db
  image: wordpress:latest
  volumes:
  - wp_site:/var/www/html
  ports:
  - "8000:80"
  restart: always
  privileged: true
  environment:
  # 可以直接使用 上方 service 名 + 端口來獲得鏈接 
  WORDPRESS_DB_HOST: db:3306
  WORDPRESS_DB_USER: wordpress
  WORDPRESS_DB_PASSWORD: wordpress
  # 定義域名
  WORDPRESS_CONFIG_EXTRA: "define('WP_HOME','https://blog.amoyiki.com'); define('WP_SITEURL','https://blog.amoyiki.com');"

volumes:
 db_data:
 wp_site:

# 啟動
$ sudo docker-compose up -d
# 關閉 
$ sudo docker-compose down

$ sudo docker-compose ps
 Name    Command      State        Ports    

blog_db_1 docker-entrypoint.sh mysqld Up 0.0.0.0:3306->3306/tcp, 33060/tcp
blog_wordpress_1 docker-entrypoint.sh apach ... Up 0.0.0.0:8000->80/tcp 
# 主要后面的 WordPress 是服務的名字 這和 docker 查看日志使用容器名不同
$ sudo docker-compose logs -f --tail=10 wordpress 
$ sudo docker-compose logs -f --tail=10 db

user root; # 這是由于 docker 容器內 WordPress 文件用戶為 www-data

server {
 listen 80;
 server_name *.amoyiki.com;
 return 301 https://$host$request_uri;                
}
upstream wordpress-workhorse {
 server 127.0.0.1:8000 fail_timeout=10s;
}
server { 
 server_name blog.amoyiki.com;
 listen 443 ssl;
 ssl on;
 ssl_certificate /ssl/path/fullchain.pem;
 ssl_certificate_key /ssl/path/privkey.pem;
 access_log /var/log/nginx/access.log main;
 # 主機中 WordPress 數據卷位置
 root /var/lib/docker/volumes/blog_wp_site/_data;


 location / {
  proxy_pass http://wordpress-workhorse;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto https;
 }
 
 location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
  expires 7d;
  access_log off;             
 }

 error_page 500 502 503 504 /50x.html;
 location = /50x.html {
  root html;
 }
}