Docker Compose Apps

The file structure responsible for creating a Docker Compose App is:

└── containers
    └── shellhttpd
        └── docker-compose.yml

The combination of a top-level directory containing a docker-compose.yml file will end-up in a Docker Compose App.

The docker-compose.yml file specifies one or more containers to run and each container configuration.

Foundries hub as source

Dockerfile in the same folder

In the shellhttpd example, the docker-compose.yml file specified the Docker Container Image from the Foundries hub: hub.foundries.io/${FACTORY}/shellhttpd:latest. In this case, the Docker Container Image shellhttpd is generated by Dockerfile in the shellhttpd folder.

└── containers
    └── shellhttpd
        ├── docker-compose.yml
        └── Dockerfile

shellhttpd/docker-compose.yml:

services:
  httpd:
    image: hub.foundries.io/${FACTORY}/shellhttpd:latest

Dockerfile in a different folder

In some cases, the Docker Container Image comes from a different application created in the containers.git repository. This is very common when you have a Docker Container Image used by multiple Docker Compose Apps.

For example:

└── containers
    ├── app
    │   └── docker-compose.yml
    └── grafana
        └── Dockerfile

In this case, the app/docker-compose.yml file looks like this:

app/docker-compose.yml:

services:
  dashboard:
    image: hub.foundries.io/${FACTORY}/grafana:latest

External hub as source

A Docker Compose App can specify a Docker Container Image from an external host. A good example is images from Docker hub.

For example:

└── containers
    └── mosquitto
        └── docker-compose.yml

In this case, the app/docker-compose.yml file looks like this:

app/docker-compose.yml:

services:
  mosquitto:
    image: eclipse-mosquitto:1.6.12

Multiple source

Last but not least, you can mix all the three examples on simple or multiple container applications. For example:

└── containers
    ├── shellhttpd
    │   ├── docker-compose.yml
    │   └── Dockerfile
    └── grafana
        └── Dockerfile

In this case, the shellhttpd/docker-compose.yml file specify three different Docker Container Images:

app/docker-compose.yml:

services:
  httpd:
    image: hub.foundries.io/${FACTORY}/shellhttpd:latest
  dashboard:
    image: hub.foundries.io/${FACTORY}/grafana:latest
  mosquitto:
    image: eclipse-mosquitto:1.6.12

• httpd: A Docker Container Image created from the same shellhttpd folder.
• dashboard: A Docker Container Image created from the grafana folder.
• mosquitto: The mosquitto Docker Container Image from hub.docker.com.