Docker Compose Wait til dependency container is fully up before launching

Question

I\'m working with a docker service using docker-compose, and I have a service that depends on anther.

I\'ve used the depends_on key, but the service with t

Answer 1

I've often found using a wait-for-it bash script much more effective than the built in health check to docker-compose.

This runs a TCP health check against a given port and waits until this is complete before starting to run a process.

Sample code:

version: "2"
services:
  web:
    build: .
    ports:
      - "80:8000"
    depends_on:
      - "db"
    command: ["./wait-for-it.sh", "db:5432", "--", "python", "app.py"]
  db:
    image: postgres

Here's some docs:

• https://docs.docker.com/compose/startup-order/
• https://github.com/vishnubob/wait-for-it