Feature request description

We are in the process of migrating our CI from using docker-compose to podman play kube and we used the podman generate kube command to generate a Kubernetes YAML file based on our existing docker-compose.yml. However, it appears that there is no container dependency functionality that is equivalent to the docker-compose depends_on functionality.

We would like to create a dependency between our application container and a database container so that the application container does not attempt to start until the database container is created and has a healthy healthcheck. This would guarantee that the application container can connect to the database container. Currently both containers are started in parallel using the podman play kube command and it is possible that the database container is not available by the time that the application container attempts to connect and causes issues.

Suggest potential solution

No response

Have you considered any alternatives?

An alternative would be adding database connection retry logic to the application to give the database container more time to get to a healthy state and then make a connection. This will work as alternative and I have a PR out for these changes (candlepin/candlepin#4656), but I was wondering if this would be helpful functionality for others.

Additional context

Example docker-compose.yml using depends_on:

version: '3.8'

services:
  postgres:
    image: postgres:latest
    container_name: postgres
    environment:
      POSTGRES_USER: candlepin
      POSTGRES_PASSWORD: candlepin
      POSTGRES_DB: candlepin
      POSTGRES_HOST_AUTH_METHOD: trust
    ports:
      - "5432:5432"
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U candlepin -d candlepin"]
      interval: 5s
      timeout: 5s
      retries: 10

  candlepin:
    image: quay.io/candlepin/candlepin:dev-latest
    container_name: candlepin
    environment:
      JPA_CONFIG_HIBERNATE_CONNECTION_URL: jdbc:postgresql://postgres/candlepin
      CANDLEPIN_AUTH_CLOUD_ENABLE: "false"
      CANDLEPIN_AUTH_TRUSTED_ENABLE: "true"
      CANDLEPIN_STANDALONE: "false"
      MODULE_CONFIG_HOSTED_CONFIGURATION_MODULE: org.candlepin.testext.hostedtest.HostedTestModule

    ports:
      - "8443:8443"
    healthcheck:
      test: curl --fail -k https://localhost:8443/candlepin/status
      timeout: 5s
      retries: 10
      start_period: 30s
    depends_on:
      postgres:
        condition: service_healthy