How to remove images, containers and other unused items in Docker?



Docker is a tool that makes it easy to package applications and services. After this facilitation their implementation is easy everywhere. In addition to using Docker, it is possible to accumulate large volumes of images and containers and additional data that clutter the source and disk space. For this reason, it is best to remove unused Docker images and containers.

Docker provides you with all the necessary tools to clean your system using the command line. In this article, we will teach you how to use these tools to remove an image and container from Docker.

Tip for using this guide

First of all, it is worth noting that the substitution syntax and command ($ command) are commonly used in popular shells such as bash, zsh and Windows Powershell.

Review of Docker and Container

Docker is an open source platform based on the Linux operating system that can be used to easily package applications. Maintaining applications in an isolated environment and space independently is one of the new goals of software development. With this technology, the activities of the programs will not interact with each other, and each of them executes commands completely independently of each other.

You can apply this technology using a virtual machine. The virtual machine stores various applications on separate hardware. In this case, the use of hardware resources is minimized, as the activity of one program does not affect the other. The container is right in front of the virtual machine and has become an alternative and, of course, a serious competitor to virtual machines.

The container separates executable environments and shares the operating system kernel. One of the advantages of Container over virtual machines is that it requires less resources and can run much faster than a virtual machine. The containers are divided into three parts: Builder, Engine and Orchestration.

Learn how to dispose of unused Docker images, containers, volumes, and grids

Docker provides a single command to clear all tagged resources, including images, containers, and networks:

$ docker system prune

To delete any useless containers and images, simply add the a-flag to the command:

$ docker system prune -a

Remove Conner and the Docker image

Remove unused containers and images from Docker

Delete Docker images

Delete one or more specific images

Use the docker images command with a- to find the ID of the images you want to delete. This command will show you each image, including the middle layers.

Once you find the images you want to delete, you can send their ID number or label to docker rmi:

The list:

$ docker images -a

Delete:

$ docker rmi Image Image

Remove hanging images

Docker images are composed of several layers. Hanging images are layers that have nothing to do with a tagged image. These images are useless and useless and consume only disk space. They can be found by adding the f-filter flag with the value dangling = true to the docker images command.

Note: If you create an image without a label, it will be in the Dangling images list; Because it has nothing to do with the torn image. So by providing a tag during creation, you can prevent this situation. To do this, select an image using the docker tag command.

Once you are sure that you have deleted these images, you can use the docker image prune command:

The list:

$ docker images -f dangling=true

Delete:

$ docker image prune

Delete images based on a template

Using docker images and grep commands, you can find all images that match a template and delete them using awk and move the identifiers to docker rmi. First of all, keep in mind that these tools are not provided by Docker and are not necessarily available on all systems:

The list:

$ docker images -a | grep "pattern"

Delete:

$ docker images -a | grep "pattern" | awk '{print $3}' | xargs docker rmi

Delete the image in Docker

Learn how to delete Docker images

Delete all images

All docker images in the system can be indexed by adding a- to the docker images command. If you need to delete all images, add a q-flag to send the image ID to docker rmi:

The list:

$ docker images -a

Delete:

$ docker rmi $(docker images -a -q)

Remove the containers

Dispose of one or more specific containers

Use the docker ps command with a-flag to find the name or ID of the containers needed to delete:

The list:

$ docker ps -a

Delete:

$ docker rm ID_or_Name ID_or_Name

Take out the container after work and get out

If you do not want to save the created container after work, you can run docker run -rm. This will automatically remove the container when you exit.

Launch and delete:

$ docker run --rm image_name

Clean all output containers

You can find containers using docker ps and filter them by status: created, restarted, running, paused or exited. Use the f flag to filter by status to check the list of discarded containers. After confirming their deletion, use -q to send the ID‌ to the docker rm command:

The list:

$ docker ps -a -f status=exited

Delete:

$ docker rm $(docker ps -a -f status=exited -q)

Remove containers with more than one filter

Docker filters can be combined with added value by repeating the flag filter. This leads to a list of containers, each of which has such conditions. For example, if you want to delete all containers that are marked as created (a state that is created when the container is executed with an invalid command) or exited, you must use two filters:

The list:

$ docker ps -a -f status=exited -f status=created

Delete:

$ docker rm $(docker ps -a -f status=exited -f status=created -q)

Remove the containers according to the template

You can find all containers that match a model using the docker ps and grep commands. Use awk to delete the list and xargs to provide the docker rm ID. However, keep in mind that these tools are not provided by Docker and are not necessarily available on all systems:

The list:

$ docker ps -a | grep "pattern”

Delete:

$ docker ps -a | grep "pattern" | awk '{print $1}' | xargs docker rm

Clean the Docker containers

Learn how to remove Docker containers

Stop and remove all containers

You can check all your system containers using docker ps. By adding the flag, all containers are displayed. When you want to delete them, you can add q-flag to the docker stop and docker rm commands to provide identifiers:

The list:

$ docker ps -a

Delete:

$ docker stop $(docker ps -a -q)
$ docker rm $(docker ps -a -q)

Delete volumes

Delete one or more specific volumes – Docker 1.9 and later

Use the docker volume ls command to find the names of the volumes to delete. You can then delete one or more volumes using the docker volume rm command:

The list:

$ docker volume ls

Delete:

$ docker volume rm volume_name volume_nam

 

Delete one or more specific volumes in Docker versions 1.9 and later

Because the purpose of volumes is to be container-independent, removing one of them will not delete the volume automatically. When there is a volume and it is not connected to any container, it is called a hanging volume. You can use the filter docker volume ls command to determine their location and confirm whether you want to delete them. This will limit the results to hanging volumes. You can now delete this entire list using the docker volume prune command:

The list:

$ docker volume ls -f dangling=true

Delete:

$ docker volume prune

Delete the container and its volume

If you have created an unnamed volume, you can use v-flag to delete it with its container. Note, however, that this method only applies to unnamed volumes.

When the container is successfully removed, its ID is displayed. Note that there is no mention of volume removal. If the volume is anonymous, it will be removed without any problems, and if it is anonymous, it will remain the same.

Delete:

$ docker rm -v container_name

last word

In this article, we’ll introduce you to common ways to remove Docker images, containers, and volumes. There are many commands and other flags that you can use. To make better use of disk space, we recommend that you remove unused and hanging images, containers, and volumes from Docker.

Frequently Asked Questions

1. What is Docker?

Docker is an open source platform based on the Linux operating system that can be used to easily package applications.

2. Is it difficult to delete Docker images, volumes and containers?

No, you can delete unused and hanging images, volumes and containers using the code mentioned in this article.

4. Which Docker images, containers and volumes should we delete?

In general, unused Docker images, volumes, and containers should be removed to make better use of disk space.

5. Why do we have to delete Docker images, containers and volumes?

You must remove Docker images, containers, and volumes to avoid excessive disk space consumption.

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