Docker Wordpress can't update/install plugins

Question

I followed this giude to install wordpress in a container for test purposes but using mariadb and linux as a host. Here is my docker-compose:

version: '3.8'

services: 
    database:
        image: mariadb
        restart: always
        environment: 
            MYSQL_ROOT_PASSWORD: password
            MYSQL_DATABASE: wordpressDB
            MYSQL_USER: user
            MYSQL_PASSWORD: password
        volumes:
            - mysql:/var/lib/mysql
    
    wordpress:
        depends_on: 
            - database
        links: 
            - database
        image: wordpress:latest
        restart: always
        ports: 
            - '8000:80'
        environment: 
            WORDPRESS_DB_HOST: database:3306
            WORDPRESS_DB_USER: user
            WORDPRESS_DB_PASSWORD: password
            WORDPRESS_DB_NAME: wordpressDB
        volumes: 
            - ./wordpress:/var/www/html
            - ./wordpress/plugins:/var/www/html/wp-content/plugins
            - ./wordpress/themes:/var/www/html/wp-content/themes
            - ./wordpress/uploads:/var/www/html/wp-content/uploads
            - ./wordpress/wp-content:/var/www/html/wp-content

volumes: 
    mysql: {}

For now I can access the wp-admin dashboard but can't update/install any plugin with error:

Could not create directory.

As mentioned here I've tried to change the permissions of the folders but with no success:

$ mkdir /var/www/html/wp-content/plugins
$ mkdir /var/www/html/wp-content/uploads
$ chown -R www-data:www-data /var/www
$ find /var/www/ -type d -exec chmod 0755 {} \;
$ find /var/www/ -type f -exec chmod 644 {} \;

Here is the output from ls -l

-rwxrwxr-x 1 1000 985   405 Jul 12 06:30 index.php
-rwxrwxr-x 1 1000 985 19915 Jul 12 06:30 license.txt
drwxrwxr-x 1 1000 985     0 Jul 12 06:30 plugins
-rwxrwxr-x 1 1000 985  7345 Jul 12 06:30 readme.html
drwxrwxr-x 1 1000 985     0 Jul 12 06:30 themes
drwxrwxr-x 1 1000 985     0 Jul 12 06:30 uploads
-rwxrwxr-x 1 1000 985  7165 Jul 12 06:30 wp-activate.php
drwxrwxr-x 1 1000 985 20480 Jul 12 06:30 wp-admin
-rwxrwxr-x 1 1000 985   351 Jul 12 06:30 wp-blog-header.php
-rwxrwxr-x 1 1000 985  2328 Jul 12 06:30 wp-comments-post.php
-rwxrwxr-x 1 1000 985  5456 Jul 12 06:30 wp-config-docker.php
-rwxrwxr-x 1 1000 985  2913 Jul 12 06:30 wp-config-sample.php
-rwxrwxr-x 1 1000 985  5592 Jul 12 07:03 wp-config.php
drwxrwxr-x 1 1000 985     0 Jul 12 06:30 wp-content
-rwxrwxr-x 1 1000 985  3939 Jul 12 06:30 wp-cron.php
drwxrwxr-x 1 1000 985 40960 Jul 12 06:30 wp-includes
-rwxrwxr-x 1 1000 985  2496 Jul 12 06:30 wp-links-opml.php
-rwxrwxr-x 1 1000 985  3313 Jul 12 06:30 wp-load.php
-rwxrwxr-x 1 1000 985 44994 Jul 12 06:30 wp-login.php
-rwxrwxr-x 1 1000 985  8509 Jul 12 06:30 wp-mail.php
-rwxrwxr-x 1 1000 985 21125 Jul 12 06:30 wp-settings.php
-rwxrwxr-x 1 1000 985 31328 Jul 12 06:30 wp-signup.php
-rwxrwxr-x 1 1000 985  4747 Jul 12 06:30 wp-trackback.php
-rwxrwxr-x 1 1000 985  3236 Jul 12 06:30 xmlrpc.php

Where am I mistaken?

Answer 1

After a bit of digging, the problem is with this line that I added in my config.php that removed the missing FTP error when I started the container:

define('FS_METHOD', 'direct');

After that I tried many times to chown the directories of the site, with no success. Which is strange because I used the root account to change them. However they remained to group users .

In the end I added the www-data user to users and root (just in case) groups and that solved the problem.

usermod -a -G users www-data
usermod -a -G root www-data

Update

Another solution I found is instead of using a bind volume ./wordpress to use normal volume wordpress with read/write permissions. Here is the new docker-compose :

wordpress:
        depends_on: 
            - database
        links: 
            - database
        image: wordpress:latest
        restart: always
        read_only: false
        ports: 
            - '8000:80'
        environment: 
            WORDPRESS_DB_HOST: database:3306
            WORDPRESS_DB_USER: user
            WORDPRESS_DB_PASSWORD: password
            WORDPRESS_DB_NAME: database
        volumes: 
            - wordpress:/var/www/html:rw

After the mentioned change the output of ls -l for the folders is like this:

-rw-r--r-- 1 www-data www-data   405 Feb  6  2020 index.php
-rw-r--r-- 1 www-data www-data 19915 Jan  1  2021 license.txt
-rw-r--r-- 1 www-data www-data  7345 Dec 29  2020 readme.html
-rw-r--r-- 1 www-data www-data  7165 Jan 21 01:37 wp-activate.php
drwxr-xr-x 1 www-data www-data  2668 May 12 23:49 wp-admin
-rw-r--r-- 1 www-data www-data   351 Feb  6  2020 wp-blog-header.php
-rw-r--r-- 1 www-data www-data  2328 Feb 17 13:08 wp-comments-post.php
-rw-rw-r-- 1 www-data www-data  5456 Jul  2 02:02 wp-config-docker.php
-rw-r--r-- 1 www-data www-data  2913 Feb  6  2020 wp-config-sample.php
-rw-r--r-- 1 www-data www-data  5560 Jul 15 07:30 wp-config.php
drwxr-xr-x 1 www-data www-data    54 May 12 23:49 wp-content
-rw-r--r-- 1 www-data www-data  3939 Jul 30  2020 wp-cron.php
drwxr-xr-x 1 www-data www-data  8378 May 12 23:49 wp-includes
-rw-r--r-- 1 www-data www-data  2496 Feb  6  2020 wp-links-opml.php
-rw-r--r-- 1 www-data www-data  3313 Jan 10  2021 wp-load.php
-rw-r--r-- 1 www-data www-data 44994 Apr  4 18:34 wp-login.php
-rw-r--r-- 1 www-data www-data  8509 Apr 14  2020 wp-mail.php
-rw-r--r-- 1 www-data www-data 21125 Feb  2 00:10 wp-settings.php
-rw-r--r-- 1 www-data www-data 31328 Jan 27 21:03 wp-signup.php
-rw-r--r-- 1 www-data www-data  4747 Oct  8  2020 wp-trackback.php
-rw-r--r-- 1 www-data www-data  3236 Jun  8  2020 xmlrpc.php

Now wordpress updates/installs plugins and the update of wordpress itself is working flawlessly.

Answer 2

get docker container name

sudo docker ps
// output wordpress

interactive with container shell

docker exec -it wordpress /bin/bash

give permission to the user

chown -R www-data:www-data /var/www/html

exit the shell

exit

Answer 3

You should make your volumes like shown below:

    volumes:
      - ./wp-content/uploads:/usr/src/wordpress/wp-content/uploads
      - ./wp-content/plugins:/usr/src/wordpress/wp-content/plugins
      - ./wp-content/themes:/usr/src/wordpress/wp-content/themes
      - ./uploads.ini:/usr/local/etc/php/conf.d/uploads.ini

I found this solution in a discussion at:

https://github.com/docker-library/wordpress/issues/341

The WordPress image copies every file/folder found in /usr/src/worpress folder to the /var/www/html/ folder. When the copy begins it also changes the user and group permissions of the file so that the WordPress application can use it.

Hope this helps. You might also want to look at the links below.

https://salzam.com/dockerize-wordpress-with-themes-plugins-and-common-configuration/

docker/wordpress: seperate default plugins from own plugins