How To Increase post_max_size In An Adminer Docker Container

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Published: 31.03.2024

Do you need to increase the post_max_size in your adminer docker container, for example, to import a bigger SQL file? In this super short guide, I will show you how I achieved it.

Increase post_max_size in an adminer docker container

Before we can start, let’s set up a basic adminer container so that we start on the same basis. In this post, I will use docker-compose, and then I can create it like this:

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    image: adminer
    restart: always
      - 8080:8080

With this, we get the following error when trying to import a big SQL file, for example, when filling a database with test data:

Too big POST data. Reduce the data or increase the "post_max_size" configuration directive.

To fix this problem, we need to start the container by overwriting the startup command. For this, we can use the command property in docker-compose, and in the command, we need to overwrite both the post_max_size and the upload_max_size by using the -d flag. (Sometimes, it is also needed to increase the memory_limit. For me, this was not the case, but if the following does not work for you, maybe check this answer here)

Our container definition will now look as follows:

    image: adminer
    restart: always
      - 8080:8080
    command: ["php", "-d", "post_max_size=500M", "-d", "upload_max_filesize=500M", "-S", "", "-t", "/var/www/html"]

And with that you are now able to import files with up to 500M. If you need more, you can adjust it to whatever you need.

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With this quick guide, you are now able to import bigger SQL files to the adminer because you used the Docker command to overwrite the post_max_size and upload_max_filesize.

I hope this guide was helpful to you, and if you have any questions, feel free to ask!
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