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For a Docker Compose service that uses an image from a registry, the reliable update sequence is:
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docker compose pull SERVICE
docker compose up -d SERVICEpull downloads the image configured for the service; up then notices the image change, stops the old container, and creates a replacement. Mounted volumes remain attached, but files stored only in the old container’s writable layer do not. If you want Compose to pull and replace the container every time, use docker compose up -d --pull always --force-recreate SERVICE.
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What actually changes during an image update
A Docker image is an immutable package of filesystem layers and metadata. A container is a created, running instance of that image with its own writable layer, networking, environment, mounts, and startup settings. Downloading a newer image does not rewrite a container that already exists. The container must be recreated from the new image.
That distinction explains the correct order. First make the desired image available locally; then ask the orchestration command to create a container from it. Restarting an existing container only starts the old container again.
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Docker’s
docker compose upreference states: “If there are existing containers for a service, and the service’s configuration or image was changed after the container’s creation,docker compose uppicks up the changes by stopping and recreating the containers (preserving mounted volumes).”
Before you replace anything
Confirm the service and image
Open compose.yaml and identify the service you intend to update. Check its image: value, any build configuration, ports, environment variables, networks, restart policy, capabilities, commands, and volume mounts. Use the service name—not the container name—in Compose commands.
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Protect persistent data
Put databases, uploaded files, save data, and other durable state in named volumes or bind mounts. Compose preserves those mounts when it recreates a service container. Data written only to the container’s writable layer belongs to that particular container; removing and replacing it removes that data.
Verify that the expected volume or bind mount is present in compose.yaml, and confirm that your backup can be restored before an upgrade. A backup is especially important for database migrations or application versions that may change the data format.
Decide whether the source is a registry or a Dockerfile
There are two different update paths:
- Registry image: the service uses
image:and you download a published image withdocker compose pull. - Locally built image: the service is built from a Dockerfile in the Compose project. You need
--build; pulling a registry image does not rebuild your local source.
Standard Docker Compose update procedure
1. Select the new image
Edit the service’s image: tag or digest in compose.yaml. Save the file. If the tag is unchanged but its publisher has pushed new content under that same tag, leave the file as-is and pull it; Compose can still detect that the image used by the existing container differs from the freshly pulled image.
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2. Pull the configured image
docker compose pull SERVICEReplace SERVICE with the service name from the Compose file. This downloads the image associated with that service. It does not stop or recreate the running container, so the old process continues using its existing image until the next step.
To update several services, run the command for each service or omit the service argument when you intentionally want to pull every configured service. Pull only what you plan to replace when minimizing downloads matters.
3. Recreate and start the service
docker compose up -d SERVICECompose compares the existing service container with the current image and service configuration. When either has changed, it stops the old container and creates a replacement from the new image, then starts it in detached mode. Mounted volumes are preserved and reattached.
If neither the image nor the configuration changed, Compose can leave the existing container in place. That behavior avoids unnecessary disruption while still applying a detected update.
One command for an explicit pull and replacement
docker compose up -d --pull always --force-recreate SERVICE--pull always requests an image pull before starting. --force-recreate tells Compose to replace the container even if it does not detect a difference. This is useful for a deliberate refresh when a mutable tag may have moved or when you want replacement to be unambiguous.
If you do not want to contact the registry on every run, use --pull missing or the default pull policy instead. Those policies avoid forcing a download each time, but they also do not guarantee that a mutable tag is refreshed on every invocation.
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Check the result
After up completes, confirm that the service is running and exercise the application’s normal health check. Check startup output for configuration errors, failed migrations, permission problems, or an incompatible data format. The expected replacement keeps the declared mounts while changing the container created from the image.
Why docker compose start did not update your container
docker compose start starts previously created, stopped containers. It does not pull an image, create a new container, or apply an image change. Therefore, this sequence is insufficient:
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docker compose start SERVICEThe pull may have downloaded a new image, but start restarts the old container, which still references the image from which it was created. Use docker compose up -d SERVICE after the pull, or use the explicit --pull always --force-recreate command.
Likewise, docker compose pull by itself changes the local image cache, not a running container. And --no-recreate explicitly prevents Compose from replacing an existing container, so do not combine it with an update procedure that requires a new image.
Updating a service built from a Dockerfile
For a Compose service whose image is produced locally, rebuild and recreate it in one operation:
docker compose up -d --build --force-recreate SERVICE--build rebuilds the Dockerfile-based image before starting the service. --force-recreate guarantees that the container is replaced even if Compose does not otherwise see a configuration difference. This path is different from docker compose pull: pull retrieves a registry image, while build constructs an image from the project’s Dockerfile and build context.
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Keep the same volume precautions as with a registry image. Rebuilding changes the image layers; it does not turn an unmounted writable-layer directory into durable storage.
Updating a container created with plain docker run
Compose can reconstruct a service from its YAML definition. A container created directly with docker run has no Compose file to reproduce its settings automatically, so record the original invocation before deleting anything.
Record every setting that must survive
- Image name and tag or digest.
- Published ports and exposed network connections.
- Environment variables and environment files.
- Named volumes and bind mounts.
- Attached networks.
- Restart policy.
- Linux capabilities or other security options.
- Entrypoint, command, working directory, and user settings.
Missing one of these can make the replacement appear broken even though the new image started successfully. In particular, omitting a mount can make an application look as if its data disappeared because it is now using an empty writable layer.
Pull, stop, remove, and run the replacement
docker pull IMAGE:TAG
docker stop CONTAINER
docker rm CONTAINER
docker run --name app -p 8080:8080 --env-file app.env -v app-data:/var/lib/app IMAGE:TAGThe final command is illustrative: repeat the original options for your container and substitute the new image reference. The pull downloads the selected image; stopping and removing discard the old container; the new docker run creates a container from the updated image. A named volume such as app-data remains available when it is mounted again.
Use a version tag or digest when you need a reproducible replacement. If you deliberately use a mutable tag, pull it immediately before recreating so the new container uses the content currently associated with that tag.
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| Storage location | What happens during Compose recreation | What happens when the container is removed | Suitable for |
|---|---|---|---|
| Named volume | Preserved and reattached to the replacement | Data remains unless the volume itself is explicitly removed | Databases, uploads, saves, and other durable state |
| Bind-mounted host directory | Host files remain and are mounted again | Host files remain | Data that must be visible or backed up on the host |
| Container writable layer | Not carried into the replacement | Removed with the old container | Temporary runtime changes only |
Docker’s Compose quickstart distinguishes stopping from removing: docker compose stop preserves the containers, while docker compose down removes containers and data written only to their writable layers. A normal image update that recreates a service has the same practical implication for unmounted files: copy anything important into a volume or bind mount first.
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Choosing an update method
| Situation | Image source | Command pattern | Replacement behavior | Persistence requirement |
|---|---|---|---|---|
| Compose service using a published image | Registry | docker compose pull SERVICE, then docker compose up -d SERVICE |
Automatic recreation when the image or configuration changed | Use named volumes or bind mounts for durable data |
| Compose service requiring an unconditional refresh | Registry | docker compose up -d --pull always --force-recreate SERVICE |
Pulls first and recreates even without detected changes | Mounted data is preserved; writable-layer data is not |
| Compose service built from project source | Local Dockerfile | docker compose up -d --build --force-recreate SERVICE |
Builds a new image and replaces the container | Mounts must still contain all durable state |
| Standalone container | Registry | docker pull, stop, remove, then repeat the original docker run |
Manual replacement; no Compose change detection | Recreate every required mount exactly |
Troubleshooting an update that appears not to work
The image pulled, but the old version is still running
You probably stopped after docker compose pull. Run docker compose up -d SERVICE. If the tag is mutable and Compose does not detect a change, use --pull always --force-recreate.
The container was not replaced
Look for --no-recreate in a script or shell alias; that flag explicitly blocks replacement. Remove it, or add --force-recreate when an unconditional replacement is required.
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Check that the replacement uses the same named volumes or bind mounts. A changed mount path, a typo in the volume name, or a plain docker run command that omitted the original mount makes existing data unavailable to the process even though it still exists elsewhere.
The update fails during startup
Review the service’s environment, ports, command, networks, capabilities, and restart policy against the previous definition. For a Dockerfile service, make sure --build was used. For a standalone container, compare the new command with the recorded original options; recreating without one required option is a configuration change, not an image defect.
A database or application reports a schema problem
Stop and preserve the previous backup before attempting repeated starts. Confirm that the application version is compatible with the existing data, and follow that application’s migration and rollback procedure. The Docker replacement mechanism preserves mounted files; it cannot make an incompatible application schema compatible.
A cautious rollout and rollback plan
- Record the current image tag or digest and the Compose configuration or original
docker runoptions. - Verify backups and confirm every durable path is a named volume or bind mount.
- Change the image reference, or prepare the Dockerfile change.
- Pull or build the candidate image.
- Recreate one service at a time when the stack allows it, rather than changing unrelated services simultaneously.
- Check startup output and the application’s normal health and data access.
- If the new version fails, restore the previous tag or digest and recreate again. Do not delete the data volume while investigating.
Keeping the old image locally and retaining the volume makes a rollback a change of image reference followed by another recreation. Removing the volume is a separate, destructive action and is not required to update an image.
Quick Recap
Compact command checklist
- Registry image, normal update:
docker compose pull SERVICEthendocker compose up -d SERVICE. - Registry image, always pull and replace:
docker compose up -d --pull always --force-recreate SERVICE. - Dockerfile image:
docker compose up -d --build --force-recreate SERVICE. - Standalone container: pull the image, stop and remove the old container, then repeat the complete original
docker runconfiguration with the new image. - Data safety: keep durable data in named volumes or bind mounts and verify backups before replacement.
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