Updating a docker container running on QNAP using SSH

SSH enabled on your QNAP NAS

1. Identify the Container and Image Name

Option A: Using Container Station GUI

1. Open Container Station.

2. Navigate to the Containers tab.

3. Click on the target container to view details.

4. Locate the Image field — this is the image used (e.g., linuxserver/nextcloud:latest).

Option B: Using SSH

Copy the container name (e.g., nextcloud) and run:

This returns the image name, e.g.:

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2. Back Up Container Volumes (Optional but Recommended)

Check volume mappings:

Back up the volume path if necessary. For example, if a volume is mounted to /share/Container/nextcloud/config, back that up using QNAP File Station or rsync.

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3. Pull the Latest Docker Image

Example:

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4. Stop and Remove the Old Container

Example:

⚠️ This does not delete the image or volume data.

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5. Recreate the Container with Same Settings

Get Existing Settings (Ports, Volumes, Env Vars)

Use:

Note the following:

• Port mappings

• Volume mounts

• Environment variables

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Re-run the Container

Example:

Replace volume paths, ports, and environment variables based on what you had before.

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6. Verify Everything Works

• Use:

  docker ps

  to confirm the container is running.

• Check logs:

  docker logs -f <container-name>

• Access the app via web browser or API to confirm it’s working.

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7. (Optional) Remove Old Images

List unused images:

Clean up dangling images:

Or remove a specific old image manually:

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Bonus: Automatically Extract and Re-run a Container

To automatically generate a docker run command:

Then review or convert the output back into a run command.