How to mount a single file in a volume

Question

I am trying to dockerize a PHP application. In the dockerfile, I download the archive, extract it, etc.

Everything works fine. However, if a new version gets released

Answer 1

I had the same issue, docker-compose was creating a directory instead of a file, then crashing mid-way.

what i did :

1. run the container without mapping the file

2. copy the config file to the host location :

   docker cp containername:/var/www/html/config.php ./config.php

3. remove the container (docker-compose down)

4. put the mapping back and remount up the container

docker compose will find the config file, and will map that instead of trying to create a directory.