Docker-compose, conditional statements? (e.g. add volume only if condition)

Question

I want to add a volume to my service, but only if the final user gave a folder for it. Otherwise, no volume should be mounted, for the already-prepared image has valid data in a

Answer 1

We can use conditional statement in docker-compose.yml file as below:

#jinja2: lstrip_blocks: True
version: "3.2"
services:
  app-name:
    image: url
    deploy:
      replicas: {{replication-num}}
      resources:
        limits:
          memory: 4G
        reservations:
          memory: 1G
      restart_policy:
        condition: any
        max_attempts: 3
      update_config:
        delay: 60s
        failure_action: rollback
        parallelism: 1
        monitor: 30s
      placement:
        constraints:
          - node.labels.node == worker
    ports:
      - "{{url}}:8000"
    environment:
      ps_environment: "{{env}}"      
    {% if env=='sandbox' %}
    extra_hosts:
      - {{ sandbox_fully }}
    {% endif %}
    secrets:
      - source: pwdFile   
    labels:
      - container_name=app-name
    networks:
      - App_External_Overlay
    volumes:
      - {{ dir }}:{{ dir }}