Why does deletion of docker container fail? How to deal with it?

When using Docker, you may encounter some common problems. One of them is an error occurred while trying to delete the container. This can be caused by a variety of reasons. Let’s take a look at some common reasons why deleting Docker containers fails and how to fix them.

1. The container is running

If you want to delete a running container, you will encounter the following error:

Error response from daemon: You cannot remove a running container

At this time, you only need to stop the container:

docker stop <container_id></container_id>

Then perform the deletion operation:

docker rm <container_id></container_id>

2. The process is still running

If the container has stopped running, but the deletion operation still fails and returns an error, it is likely that It's due to the Docker daemon still marking the container as "running". You can use the docker ps command to check whether the container has really stopped running. If the status shows "Exited", the container has been stopped.

If the container has stopped but cannot be deleted, it may be a bug in the Docker daemon. You can use the following command to bypass the bug:

docker rm -f <container_id></container_id>

This command will appear "force" (force) flag, which will force removal of the container. Note that this may result in data loss or other problems, so it is recommended to use this option with caution.

3. The container retains the data volume

If the container is linked to a data volume or storage, the container itself cannot be deleted directly. The related data volume or storage must be deleted before the related container can be deleted. You can use the following command to see if the container is linked to the data volume:

docker inspect <container_id></container_id>

In the JSON returned by this command, check the Mounts section to see if the container is linked to the data volume. For example:

"Mounts": [
    {
        "Type": "bind",
        "Source": "/host/path",
        "Target": "/container/path",
        "ReadOnly": false,
        "Consistency": "consistent"
    }
]

If the container is linked to a data volume, the data volume must be deleted before the container can be successfully deleted. You can use the following command to delete the data volume:

docker volume rm <volume_name></volume_name>

4. The container is occupied

If the container is being occupied by docker-compose or other tools, it cannot be deleted directly. You can use the following command to stop all containers that this container is linked to:

docker-compose down

Then try to delete the container.

5. The container has been deleted

If an error is returned when trying to delete a container, indicating that the container does not exist, it may be that the container has been deleted. You can use the following command to view the list of recently deleted containers:

docker ps -a --filter status=exited

Then use the following command to delete deleted containers:

docker rm <container_id></container_id>

Conclusion

The above are some common deletions Reasons why Docker containers fail and how to fix them. When working with Docker, you sometimes encounter some problems, which can arise for a number of reasons. It's important to learn to diagnose and resolve these problems quickly. Hope this article is helpful to you.

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