Operate Docker

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Audience

Docker operators and framework administrators.

Prerequisites

Docker Compose access to the EmuFramework installation.

Common commands

docker compose up -d
docker compose stop
docker compose start
docker compose ps
docker compose logs --tail=200 app
docker compose logs --tail=200 updater
docker compose pull

Use docker compose down only when the containers and network should be removed; the named volume remains. Never add -v unless deleting all application data is intentional.

Verify the updater

The updater is intentionally not exposed on a host port. It is reached only by the app over the Compose network:

http://updater:3400

Check both services and their logs:

docker compose ps
docker compose logs --tail=100 app
docker compose logs --tail=100 updater

Confirm that the app, rather than only the updater, has the required settings:

docker compose exec app printenv EMU_DEPLOYMENT_MODE
docker compose exec app printenv EMU_UPDATER_URL

Expected values are docker and http://updater:3400. Recreate the app after changing .env:

docker compose up -d --force-recreate app

Docker Desktop checks

When containers were created manually in Docker Desktop, verify that both containers share a user-defined network and that the app has a /data volume. The updater must have access to /var/run/docker.sock; this grants host-level Docker control and should be treated as a high-privilege component. See Docker installation for the exact connectivity test command for manually created containers.

Update status states

A successful update moves through this sequence, tracked in the file set by EMU_UPDATE_STATE_PATH (default /data/update-status.json):

pending -> running -> restarting -> succeeded

Diagnose `fetch failed` during update checks

Common causes, roughly in order of likelihood:

The app and updater containers are not on the same Docker network.
The updater container is missing the network alias updater.
The app’s EMU_UPDATER_URL is not http://updater:3400.
EMU_UPDATER_TOKEN differs between the app and the updater.
The updater is not mounting /var/run/docker.sock.
The updater is not mounting emu-data at /data.
EMU_APP_CONTAINER does not match the app container’s actual name.

Manual rollback

Keep the verified pre-update backup.
Set EMU_VERSION in .env to the previous known-good version.
Run docker compose pull && docker compose up -d.
Restore databases only when a documented migration requires it; container rollback does not alter database files.

Docker installation · Database storage