Converting Docker Apps to Compose Apps

Factories created before the introduction of compose apps must be converted to use compose apps.

Enabling Compose Apps in a Factory

The factory’s definition file in ci-scripts needs to be updated to enable compose apps:

git clone https://source.foundries.io/factories/<factory>/ci-scripts

Edit factory-config.yml so that containers.params includes DOCKER_COMPOSE_APP: "1" for both build types. For example:

containers:
  params:
    DOCKER_COMPOSE_APP: "1"

lmp:
  params:
    DOCKER_COMPOSE_APP: "1"

Once enabled all new container.git changes will:

• Continue to build docker apps for each .dockerapp file in the repository

• Convert .dockerapp files into docker-compose and produce compose apps

Top-level directories containing a docker-compose.yml will be treated only as a compose app.

With DOCKER_COMPOSE_APP=1, all new devices will be configured to use compose apps when registered using lmp-device-register.

Converting Existing Devices

Existing devices can be converted to use compose apps using fioctl:

fioctl devices config updates --compose-apps <device-name>

If the device is using persistent volume(s) relative to its installed location then setting compose-dir can be used to not lose data:

fioctl devices config updates --compose-apps --compose-dir /var/sota/docker-apps <device-name>

Completing The Migration

After all Factory devices are converted to compose apps, the .dockerapp files in containers.git can be converted to compose app style applications. For example:

# shellhttpd.dockerapp
version: 0.1.1
name: shellhttpd
description: Dummy shell script that runs an httpd server using netcat

---

version: '3.2'

services:
  httpd:
    image: hub.foundries.io/andy-corp/shellhttpd:latest
    restart: always
    ports:
      - 8080:${PORT}
    environment:
      MSG: "${MSG}"

---

PORT: 8080
MSG: Hello world

Can become:

# shellhttpd/docker-compose.yml
version: '3.2'

services:
  httpd:
    image: hub.foundries.io/andy-corp/shellhttpd:latest
    restart: always
    ports:
      - 8080:${PORT-8080}
    environment:
      MSG: "${MSG-Hello world}"