Docker stack
6.4.6.2. Example - Docker stack

Docker Compose files can also be used in swarm cluster environments.

The following example uses Docker volumes, profiles, secrets and limit the resources to deploy Adminapp and Loginapp as separate containers.

Caution when using -XX:MaxRAMPercentage

The option -XX:MaxRAMPercentage limits the amount of heap available to the JVM to the specified percentage of the total amount of memory available for the container.

It is important not to set this value too high (e.g. to 100): If the JVM and additional processes running in the container (e.g. through docker exec) exceed the container's memory limit, the container may be killed.

The default value for -XX:MaxRAMPercentage is 25.

This template can be used with "docker stack":

docker-compose.yml

version: '3.7'
services:
  loginapp:
    image: "${IAM_IMAGE}" # Use container image from local environment variable
    read_only: true
    volumes:
      - type: volume
        source: "airlock_iam_config"
        target: "/home/airlock/iam"
      - type: tmpfs
        target: "/home/airlock/work"
    environment:
      - "TZ=Europe/Zurich"
      - "IAM_JAVA_OPTS=-XX:MaxRAMPercentage=50"
      - "IAM_MODULES=loginapp"
      - "IAM_SENSITIVE_VALUES_CONFIG=secrets:/run/secrets/airlock_iam_secrets"
      - "IAM_LICENSE=/run/secrets/airlock_iam_license"
    ports:
      - "8443"
    deploy:
      resources:
        limits:
          memory: "4G"
  adminapp:
    image: "${IAM_IMAGE}"
    read_only: true
    volumes:
      - type: volume
        source: "airlock_iam_config"
        target: "/home/airlock/iam"
      - type: tmpfs
        target: "/home/airlock/work"
    environment:
      - "TZ=Europe/Zurich"
      - "IAM_JAVA_OPTS=-XX:MaxRAMPercentage=50"
      - "IAM_MODULES=adminapp,service-container"
      - "IAM_SENSITIVE_VALUES_CONFIG=secrets:/run/secrets/airlock_iam_secrets"
      - "IAM_LICENSE=/run/secrets/airlock_iam_license"
    ports:
      - "8443"
    deploy:
      resources:
        limits:
          memory: "2G"

volumes:
  airlock_iam_config:
    external: true

secrets:
  airlock_iam_secrets:
    external: true
  airlock_iam_license:
    external: true