Question 212214 in Docker Question posted in
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Issue with Mounting a Volume in Docker Container

I have the following problem. I am trying to mount a volume using docker-compose. When no volume is mounted, the container works perfectly fine. However, as soon as I attempt to mount a local directory to a path in the Docker container, the target path becomes empty, and the Docker container becomes corrupted. It appears as though the local folder is overwriting the folder in the container. This issue is not specific to a particular image; it affects other Docker containers as well. In Docker Desktop, the corresponding paths are listed under File Sharing. Here is an example file:

version: '3'

services:
  shop:
    container_name: Dev_shopware6
    image: dockware/dev:6.5.3.3
    ports:
      - "22:22"     # ssh
      - "80:80"     # apache2
      - "443:443"   # apache2 https
      - "8888:8888" # watch admin
      - "9998:9998" # watch storefront proxy
      - "9999:9999" # watch storefront
      - "3306:3306" # mysql port
    volumes:
      - ./src:/var/www/html
    networks:
      - web
    environment:
      - XDEBUG_ENABLED=0


Dev_shopware6 | AH00112: Warning: DocumentRoot [/var/www/html/public] does not exist
Dev_shopware6 | AH00112: Warning: DocumentRoot [/var/www/html/public] does not exist

Im working on MacOS with Docker Desktop

Projectstructure

.
├── docker
│   └── db
├── docker-compose.yml
├── readme.md
└── src

4 directories, 2 files

ls -la inside the container

www-data@63f6c46e9787:~/html$ ls -la
total 492
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:49 .
drwxrwxrwx 1 root     root       4096 Jul 18 15:49 ..
-rw-r--r-- 1 www-data www-data   1247 Jul 18 15:42 .env
-rw-r--r-- 1 www-data www-data    647 Jul 18 15:42 .gitignore
-rw-r--r-- 1 www-data www-data    369 Jul 18 15:42 .htaccess
-rw-r--r-- 1 www-data www-data    350 May  3 10:38 README.md
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:42 bin
-rw-r--r-- 1 www-data www-data   1769 Jul 18 15:44 composer.json
-rw-r--r-- 1 www-data www-data 415799 Jul 18 15:44 composer.lock
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:42 config
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:42 custom
-rw-r--r-- 1 www-data www-data    334 Jul 18 15:42 docker-compose.override.yml
-rw-r--r-- 1 www-data www-data   1070 Jul 18 15:42 docker-compose.yml
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:43 files
-rw-rw-rw- 1 www-data www-data      0 Jul 18 15:43 install.lock
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:43 public
-rw-r--r-- 1 www-data www-data   6427 Jul 18 15:42 symfony.lock
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:44 var
drwxr-xr-x 1 www-data www-data   4096 Jul 18 15:44 vendor
Tags:

2

Answers


  1. 0

    From the docs:

    If you bind-mount a directory into a non-empty directory on the
    container, the directory’s existing contents are obscured by the bind
    mount. This can be beneficial, such as when you want to test a new
    version of your application without building a new image. However, it
    can also be surprising and this behavior differs from that of docker
    volumes.

    So basically, you can’t bind mount a host directory on top of an existing directory in the image without ‘hiding’ the directory content in the image.

    You mount your ./src directory on /var/www/html/ and that hides everything in /var/www/html/ and below.

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  2. 0

    Based on your replay in comments I assume you want to create a development environment for the project you have shared in the comment section.

    You can do the following:

    1. Run you container without the mount line

    2. Run this command docker cp <container name>:/var/www/html/ ./src (the path may vary based on your system)

    3. Run you container with the mount line

    This way you your src folder will have all the files from the original container. The project you shared have public folder so everything should work well.

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