Detailed explanation of how to clear Docker containers in Exited state

Docker is an open source virtualization container technology that provides a platform to easily create, deploy and manage applications. In the process of using Docker, we may encounter situations where some containers cannot be started and need to be cleaned. The most common situation is that the container exits for some reason, but the container's file system is still occupying disk space. This article will introduce how to clear these Docker containers in the Exited state.

1. Check Exited Containers

First we need to check all current Docker containers and find out which ones are in the Exited state. We can view it through the following command:

docker ps -a

This command will output the information of all Docker containers, including the container's ID, status, creation time, and the image it belongs to. We can find the container with the Exited status and note its corresponding container ID.

2. Clean up the Exited container

With the container ID, we can use a command provided by Docker to completely delete it:

docker rm <CONTAINER_ID>

Among them, is the status The ID of the Exited container. This command will delete all information about the container, including its file system and network configuration. It should be noted that if the container is running, the deletion operation will fail, so be sure to ensure that the container to be deleted is in the Exited state.

3. Clean multiple Exited containers

If there are multiple Exited containers that need to be cleaned, we can use the filter function provided by Docker to quickly find them. For example, the following command will list all containers in the Exited status:

docker ps -aqf "status=exited"

This command uses the filter "status=exited", which will filter out all containers in the Exited status and output their ID.

With these IDs, we can use a simple command to delete these containers in batches:

docker rm $(docker ps -aqf "status=exited")

This command will delete all Docker containers with a status of Exited.

Summary

This article introduces how to clean up Docker containers in the Exited state. In actual use, we should regularly clean up useless containers and images to avoid taking up too much disk space. At the same time, we must also be careful when cleaning up containers to ensure that running containers are not deleted by mistake.

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