执行docker-compose up遇Docker4Drupal多站点容器冲突问题求助

Hey there! Let's work through this container conflict issue you're facing with your docker4drupal sites. Since you're new to Docker, I'll keep this step-by-step and easy to follow.

Why This Happens #

The most common culprit here is lack of isolation between your Docker Compose projects. By default, Docker Compose uses your current directory name as the "project name" to namespace containers, networks, and volumes. If two sites share the same directory name (or you accidentally use the same project name), their resources will get mixed up. Docker4Drupal's default config might also rely on shared resources if you haven't customized them for isolation.

Troubleshooting Steps #

First, let's confirm the root cause:

• Run docker-compose ps in each site's directory. Look at the container names—if they start with the same prefix (e.g., drupal_site_php_1 for both), that means they're using the same project name.
• Check shared networks: Run docker network ls and see if both sites are connected to the same custom network (look for names tied to docker4drupal).
• Check shared volumes: Run docker volume ls and look for volumes that might be used by both sites (e.g., drupal_modules without a unique prefix).
• Open your docker-compose.yml files. If you see hardcoded values like container_name: php or network: drupal_network, those are likely causing conflicts since they're not unique per site.

Fixes to Implement #

1. Enforce Unique Project Names #

This is the easiest and most effective fix:

• Option 1: Use an environment variable when starting
  For your first site, run:

  COMPOSE_PROJECT_NAME=my_first_site docker-compose up -d
  

  For the second site, run:

  COMPOSE_PROJECT_NAME=my_second_site docker-compose up -d
  

  This adds a unique prefix to all containers, networks, and volumes for each site, keeping them fully isolated.

• Option 2: Use a .env file (permanent fix)
  In each site's root directory, create a file named .env with this line:

  COMPOSE_PROJECT_NAME=my_first_site
  

  Replace my_first_site with a unique name for each site. Now every time you run docker-compose in that directory, it will automatically use this project name.

2. Fix Hardcoded Configs in docker-compose.yml #

If your config has hardcoded resource names, update them to use variables for uniqueness:

• Remove any container_name lines (let Docker Compose auto-generate names with the project prefix).
• Update networks to use the project name variable:

  networks:
    default:
      name: ${COMPOSE_PROJECT_NAME}_default_network
  

• Update volumes similarly:

  volumes:
    drupal_modules:
      name: ${COMPOSE_PROJECT_NAME}_drupal_modules
    drupal_files:
      name: ${COMPOSE_PROJECT_NAME}_drupal_files
  

3. Clean Up Conflicting Resources #

Before re-launching your sites, clear out any mixed-up resources:

• For each site, run docker-compose down to stop containers and remove associated networks.
• If you see leftover conflicting networks/volumes, delete them manually:

  # Delete a conflicting network
  docker network rm <conflicting_network_name>
  # Delete a conflicting volume
  docker volume rm <conflicting_volume_name>
  

  Note: Be careful not to delete resources used by your working sites!

4. Verify Isolation #

Launch your first site, run docker-compose ps to confirm all containers have the unique project prefix. Then stop it with docker-compose down, launch the second site, and check again—you should see only containers with the second site's prefix, no mixing.

Prevent Future Conflicts #

• Always use unique COMPOSE_PROJECT_NAME values for each site (even if directory names are unique, explicit is better).
• Avoid hardcoding container, network, or volume names in your docker-compose.yml—let Compose handle naming with project prefixes, or use variables.
• When switching between sites, always run docker-compose down to fully stop and clean up resources for the current site before starting another.

内容的提问来源于stack exchange，提问作者retrodans