Eliminate Docker Volumes, Images and Containers in a matter of seconds (r) (r)

An image or blueprint -- of the software source code, dependencies and the tools needed to create an application inside a Docker container is commonly referred to by the name of an image. Applications that use Docker and need permanent data may rely on volumes of storage that are independent of the underlying operating system.

Effective organization of images, volumes and containers is essential for the successful use of Docker. Inactive versions of these assets are likely to accumulate taking up valuable storage space on disks, eventually impacting performance of the system.

This article explores different ways to keep your system organized by clearing images (both simultaneously and all at once), volumes, and containers. Additionally, we'll utilize the docker's docker command line interface (CLI) to complete this task in a short time.

How to Delete Docker Images

Removal of outdated or inefficient images from Docker is vital to keep neat and tidy the entire system. Let's look at how the CLI will target specific images to remove.

Then, let's take a take a look at images inside Docker using the docker image using the ls command:

$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE my_image latest 2cbc27836df4 60 seconds ago 7.05MB 85b412789704 2 days ago 7.05MB demo latest 26d80cd96d69 15 months ago 28.5MB

The above listing has displayed images with the titles my_image and demo with tags that match as the latest. The third image isn't tagged with a tags or names. In this case, it's an "dangling" image. It's an image not being used by the container. The image that is hanging was the result of an overhaul of my_image (a normal occurrence). This was the previous version of the image was present in the file system, but has been removed from use.

The table also lists the initial 12 characters of every image's 64-character IDas as well as the creation dates, and the storage space the images consume.

Remove All Images that are not useful

In this example the above example, we see a hanging image. It is also possible for an image with no label or no name to be active. In this instance, for example, it may have been used as a starting point for a container by referencing its ID.

To eliminate the images that hang by using the docker image pruning command, you can use the following: docker image prune command:

$ docker image prune WARNING! It will take away all hanging images. Are you sure you want to continue? [y/N] y Deleted Images: deleted: sha256:85b412789704c17e9c5e7edc97b2f64c748bbdae7eaa44d3fe2cc21a87acad3d Total reclaimed space: 7.05MB

The images will be re-listed to determine the final outcome of our research:

$ docker image ls REPOSITORY TAG IMAGE ID CREATED SIZE my_image latest 2cbc27836df4 70 seconds ago 7.05MB demo latest 26d80cd96d69 15 months ago 28.5MB

After pruning The image without the name or label has vanished.

Removing a Specific Image through the name

You can target an image to be deleted by using its title:

Image rm of the docker Image_name

Note: You can't easily remove images still in use. The images should be removed or removed from all programs that make use of the images. Although it's generally not recommended but you could force the removal of any active image by using the flag"-f" flag:

Image rm in $Docker"image_name>" -f

Making use of the shorthand removal of Images

The Docker CLI provides a quick way to remove images within the an alias of rmi. When you use it to delete an image using its name, it appears like this:

$ docker rmi demo Untagged: demo:latest Deleted: sha256:2cbc27836df4a7707e746e28368f1fdecfefbfb813aae06611ca6913116b80b4

We'll employ the RMI in the subsequent cases of image removal.

Remove All Images not tagged

Photos that do not have tags can still take up precious disk space and make your system slower over the course of time.

To eliminate any images that are not tagged, to get rid of the images that have not been tagged Docker you can use to use the docker rmi command which comes with the option of filtering. Filters are able to be created that are based on specific criteria by using"-f" option. "-f" option (not to be confused with the -f flag available for images that are removed which triggers an event).

This filter of the dangling parameter is employed to detect pictures that are not tagged:

$ docker rmi $(docker images -f "dangling=true" -q)

It is the option --q option to display the IDs for images in the images that are not tagged. These IDs are given as arguments to docker RMI to get rid of the images.

The filter is based on the concept of "dangling," but as noted above, some pictures that aren't tagged may have tags that are in use. If you are notified, the image you select by this filter isn't actually hanging.

Remove a specific image by using an ID

The docker RMI command is used to erase images by referencing its ID

Docker $ rmi image_id>

Removing a Specific Image Based on the Name and Tag

You can delete a specific image, along with its name and the tags by using to the Docker RMI command.

If, for instance, you have multiple images with identical titles but distinct tags, you can eliminate one by following this style:

Docker RMI Tag>

This method is handy when you need to remove the specific variant of an image instead of eliminating all images associated with a repository.

Eliminate All Images Using the Most Current Tag

For Docker the "latest" tag refers to an updated version of the Docker image. This tag is typically used as the standard tag for Docker images. It will be assigned automatically to the most recent Version of the image except if a distinct tag is defined.

Docker provides a command to remove all images bearing"latest" tag "latest" tags:

$ docker rmi $(docker images"grep "latest" | Awk 'print' $3"')

The command above is split into two components. First it gets an ID list of images before passing the ID list to the docker the rmi command.

Removal of Images from a Remote Repository

If you wish to delete images from an online repository, like, Docker Hub You'll need login to your account via the Docker CLI.

After you have logged into your account, you just need to make use of docker the rmi docker RMI command to erase the image. Docker command can be used to remove images from both local and remote locations. docker command may be utilized to eliminate images from both local and remote areas. command will remove the images both from remote and local locations.

docker me_repo rmi/my_image_tag

You can't extract images from images uploaded to the repository. Similar to that, you can't remove images used by running containers.

Removal of Multiple Images from an Online Repository

To remove many pictures from an online repository You can use the docker the rmi command. This is followed by tags IDs for the pictures or images. Example:

docker rmi my_repo/image_tag_1 my_repo/image_tag_2 the_repo/image_tag_3

It'll pull out the three images that have the tags images_tag_1, image_tag_2 image_tag_3, in addition to images_tag_3 from the repository my_repo.

How to Delete the Docker Volumes

The Docker volumes may occupy a lot of disk space especially when they house large quantities of data, or have multiple backups. By removing the volumes no longer needed, you reduce the chance of data leaks as well as ensure that data with sensitive information isn't available to users who aren't authorized. Removing volumes regularly can help to keep the Docker environment up-to-date and prevent problems caused by data that's out of date.

They permanently delete all the data stored in the volume. Be careful when using them.

Take All Volumes That Aren't In Use

In Docker it is essential to eliminate any unnecessary volume . This is just as important as taking out containers or images.

To free up disk space, you can use to use the docker volume prune command.

Removing a Volume with a Specific Name using the name

The removal of a specific volume out of Docker is a good idea for the removal of unused volume. This is how you can delete the volume:

docker volume rm my_volume_name

With the above command the volume known as my_volume_name is deleted. Docker will give you an error message if you try to remove an unneeded volume. You can check available volumes using docker volume ls command. docker volume command. command.

How do you delete Docker containers

Take All Containers That Are Stopped Off

The command docker container prune is able to remove all stopped containers in Docker. This command generates an inventory of the closed containers to be removed , and then asks for confirmation prior to moving on. This allows you to regain the disk space and keep your Docker environment clean and tidy. Docker environment while allowing you to verify whether you're losing any important data:

Docker Container Pruning $ Warning! The warning message will be removed from all shut down containers. Are you sure you want to keep going? [Y/N] ydeleted containers:4df4c47c4df4df4 d35bce

It's important to remember that only those containers that have been stopped can be eliminated using this command. If you need to remove the running containers, you'll have to stop them before you can use another command.

Removal of a container with a Particular ID

In Docker it is possible to remove a specific container by ID through the docker rm command together with the identification of the container. First, you have to get all the information regarding the container's ID by through the docker command ps:

$ docker ps -q 1ce3cdeb4035 06b79541e25c Fa98f1804e3e docker rm 1ce3cdeb4035

The command above works only while the container is in an unstoppable state. If it's still in operation, you must to eliminate it by using the -f flag:

$ docker rm -f 1ce3cdeb4035

Remove a Specific Container by using a Name

Docker comes with a multi-purpose docker rm command, which allows users to erase both containers by name in addition to by the ID.

If, for instance, you have a container named web_server and you want to remove it, do so it by using the below procedure:

Docker $ web_server

The first step is to close the container. Docker comes with the command docker stop command, which allows you to shut down any container.

Get rid of all the containers in use

To get rid of all containers running, make use of the docker command: rm command:

Docker Rm $(docker ps"-q")

By using docker ps , docker shows the IDs of containers currently in operation. After that, the IDs are transferred into docker using DOCKER command. This removes all of the containers.

Take note that this command can only remove running containers. If you'd like to remove any container, not just one which is shut down you can use the below command:

Docker Rm $(docker Ps ps a -q)

Summary

This article explains the steps to get rid of Docker volume, images and containers. The course covered several ways to ensure a clean and tidy systems. This course taught commands to erase all images that are not used, untagged or particular images through the identification of the image or name. You also learned commands to remove all containers that are stopped or an individual container through the number or ID.

Removal of Docker volumes, images and containers is a straightforward process that can help organize your components and free more space on your disk and, often increasing the efficiency of your system.

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