Allow image posting with [Docker + WordPress + MySQL]

Yes, it's Haru Usagi. This time I got a WordPress project at work and I got stuck, so I will write a memo. I think that people who usually touch WordPress know this.

Premise

• Build a WordPress environment with docker
• Create a theme in that environment

Where I got stuck this time

• After building a WordPress environment with docker, I can't upload images with WordPress
• The container does not start up in the first place

I will look at them in order. First directory structure

wp-template
├── docker-compose.yml
├── wp-config.php
└── wp-content
    ├── index.php
    ├── languages
    ├── plugins
    ├── themes
    ├── upgrade
    └── uploads

At worst, it works if you have the docker-compose.yml and wp-content folders. If you do docker-compose up, the contents of wp-content will be automatically configured as the initial ones. wp-config.php is a required file for WordPress. Will it be automatically generated during installation? It looks like, but in my case it didn't do it, so official wp-config.php I changed it for reference.

docker-compose.yml

version: "3"

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

  wordpress:
    depends_on:
      - db
    image: wordpress:latest
    ports:
      - "8000:80"
    restart: always
    environment:
      WORDPRESS_DB_HOST: db:3306 
      WORDPRESS_DB_USER: wordpress #Any
      WORDPRESS_DB_PASSWORD: wordpress #Any
    volumes:
      - ./wp-content:/var/www/html/wp-content
      - ./wp-config.php:/var/www/html/wp-config.php
volumes:
  db_data:

I thought it would be easier to manage DB-related items in .env. Now when you access [http: // localhost: 8000 /](http: // localhost: 8000 /), you will see the familiar WordPress screen.

What you can do normally up to this point.

After building a WordPress environment with docker, I can't upload images with WordPress

I can't upload an image to post in WordPress! When I looked it up, it seems that I have to add a sentence in wp-config.php.

wp-config.php

define('DB_NAME', 'wordpress'); #docker-compose.What was set in yml
define('DB_USER', 'wordpress');　#docker-compose.What was set in yml
define('DB_PASSWORD', 'wordpress'); #docker-compose.What was set in yml

define('DB_HOST', 'db');　#docker-compose.mysql container name defined in yml
define('WP_DEBUG', true);
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');

define('AUTH_KEY',         'put your unique phrase here');
define('SECURE_AUTH_KEY',  'put your unique phrase here');
define('LOGGED_IN_KEY',    'put your unique phrase here');
define('NONCE_KEY',        'put your unique phrase here');
define('AUTH_SALT',        'put your unique phrase here');
define('SECURE_AUTH_SALT', 'put your unique phrase here');
define('LOGGED_IN_SALT',   'put your unique phrase here');
define('NONCE_SALT',       'put your unique phrase here');
define('UPLOADS', 'wp-content/uploads' ); #Add this

$table_prefix = 'wp_';

if ( !defined('ABSPATH') )
	define('ABSPATH', dirname(__FILE__) . '/');

require_once(ABSPATH . 'wp-settings.php');

This is the final form of code. The code that needed to be added below.

define('UPLOADS', 'wp-content/uploads' );

The container does not start up in the first place

sed: cannot rename ./xxxxx Device or resource busy is displayed and the container does not start. When I looked it up, the following article came out. This is the solution. The wisdom of our ancestors is wonderful. https://qiita.com/suzukihi724/items/e56fa9516639c6c90a33

in conclusion

I've been using WordPress since I was a student, but it wasn't difficult because it was a MAMP environment. This time I built the environment with docker, so I thought that I could understand the deep part of WordPress. I think that it was normal content for those who usually touch it. .. ..