How to update wordpress on docker

Question

I\'m running a php-fpm wordpress container.

The wordpress source files are mounted in a named volume "wordpress" shared with the Nginx container.

Everyth

Answer 1

When the wordpress container comes up it checks for the existence of files at /var/www/html and copies only if not present. So in your case may you can update the entrypoint script to check the wordpress version in the wp-includes/version.php in the /var/www/html and the files in the container and then make a decision to replace the new files.

Edit:

According to this just deletion of index.php or wp-includes/version.php should copy the files from container again. Or may you can update your entrypoint script to copy files to /var/www/html all the time, but that may cause issues if you choose to scale the wordpress layer.

Answer 2

My answer applied to the official docker wordpress image. So probably off topic but might help someone.

If you are using docker-compose you can pull the latest image using this command.

docker pull wordpress

I believe this will update your core docker image. Any other local project which you docker-compose up -d with this yml image setting as this will use the latest update.

  services:
    wordpress:
      image: wordpress:latest

If you currently running the image will you need to docker-compose down and docker-compose up -d to invoke the update.

Answer 3

Thank you for your help. It worked. Here is the code i'm using.

I overriden the entrypoint in dockerfile

COPY check-wordpress-version.sh /usr/local/bin/

ENTRYPOINT ["check-wordpress-version.sh"]

Here is the content of check-wordpress-version.sh to check wordpress current version.

VOLUME_VERSION="$(php -r 'require('"'"'/var/www/html/wp-includes/version.php'"'"'); echo $wp_version;')"
echo "Volume version : "$VOLUME_VERSION
echo "WordPress version : "$WORDPRESS_VERSION

if [ $VOLUME_VERSION != $WORDPRESS_VERSION ]; then
    echo "Forcing WordPress code update..."
    rm -f /var/www/html/index.php
fi

docker-entrypoint.sh php-fpm

Answer 4

To expend on @Bigbenny's answer, my Dockerfile looked like the following:

FROM wordpress:latest

WORKDIR /var/www/html

COPY . /var/www/html

COPY check-wordpress-version.sh /usr/local/bin/

RUN chmod 755 /usr/local/bin/check-wordpress-version.sh

ENTRYPOINT ["/usr/local/bin/check-wordpress-version.sh"]

Two things to notice here:

1. I had to chmod 755 the file or I would get a permissions denied error
2. I placed the script inside the /usr/local/bin because for some reason when I would just use ENTRYPOINT["check-wordpress-version.sh"], the file wouldn't be found by the container.

I also, slightly tweaked the script to look like:

#!/bin/sh

VOLUME_VERSION="$(php -r 'require('"'"'/var/www/html/wp-includes/version.php'"'"'); echo $wp_version;')"
echo "Volume version : "$VOLUME_VERSION
echo "WordPress version : "$WORDPRESS_VERSION

if [ $VOLUME_VERSION != $WORDPRESS_VERSION ]; then
    echo "Forcing WordPress code update..."
    rm -f /var/www/html/index.php
    rm -f /var/www/html/wp-includes/version.php
fi

docker-entrypoint.sh apache2-foreground

For my use-case, I had to use apache2-foreground rather than php-fpm; I also deleted the /var/www/html/wp-includes/version.php file.

Finally, in my docker-compose, instead of the using the image directive; I used build: ./wordpress.

I hope this helps!

Answer 5

Wordpress seems to have addressed this under this issue.

I notice you are using a custom wp-config.php. Most likely, you can use the WORDPRESS_CONFIG_EXTRA for this rather than mounting wp-config.php.

Theoretically (per the link above), updating the image should update the database, but I have not confirmed.

Based on this, my stack.yml/docker-compose.yml looks like this:

    environment:
      WORDPRESS_CONFIG_EXTRA: |
        define( 'AUTOMATIC_UPDATER_DISABLED', true );
    volumes:
      - "./themes:/var/www/html/wp-content/themes/"
      - "./plugins:/var/www/html/wp-content/plugins/"
      - "./uploads:/var/www/html/wp-content/uploads/"