docker healthcheck

[hamnis]

Hello.

I am testing out wundergraph cosmo for a client, and I am wondering what the recommended approach for implementing healthchecks in docker-compose since the current image does not have bash OR curl.

For now I have built a custom image with curl. Could we maybe build a healthchecker into the router binary? This could read the router config and run the check using go's http lib.

This is what I have now.

services:
  supergraph:
    image: my.custom.repository/supergraph-cosmo:0.233.0
    pull_policy: missing
    restart: on-failure
    environment:
      LISTEN_ADDR: '0.0.0.0:4000'
      DEV_MODE: 'true'
      CONFIG_PATH: /app/config/cosmo.yml
    volumes:
      - 'supergraph-config:/app/supergraph'
      - ./cosmo-router.yaml:/app/config/cosmo.yml
    ports:
      - '4000:4000'
    depends_on:
      supergraph-compose:
        condition: service_completed_successfully
        restart: true
        required: true
    networks:
      - default
    healthcheck:
      test: [CMD-SHELL, 'curl -f http://127.0.0.1:4000/health/ready || exit 1']
      retries: 3
      timeout: 5s

Possible api.

services:
  supergraph:
    image: ghcr.io/wundergraph/cosmo/router:0.233.0
    pull_policy: missing
    restart: on-failure
    environment:
      LISTEN_ADDR: '0.0.0.0:4000'
      DEV_MODE: 'true'
      CONFIG_PATH: /app/config/cosmo.yml
    volumes:
      - 'supergraph-config:/app/supergraph'
      - ./cosmo-router.yaml:/app/config/cosmo.yml
    ports:
      - '4000:4000'
    depends_on:
      supergraph-compose:
        condition: service_completed_successfully
        restart: true
        required: true
    networks:
      - default
    healthcheck:
      test: [CMD, 'router', 'healthcheck', '-c', '/app/config/cosmo.yml']
      retries: 3
      timeout: 5s