In Docker, you can manage image by creating, pulling, and deleting them. Here is a detailed guide on managing image in Docker:
Creating an Image
To create an image, you need to use a Dockerfile or create an image from an existing container. Use the docker build command along with the path to the Dockerfile and the name of the image.
For example, docker build -t myimage . will create a new image from the Dockerfile in the current directory and name it "myimage".
Pulling an Image
To pull an image from a Docker Registry (such as Docker Hub), use the docker pull command followed by the name of the image.
For example, docker pull nginx will pull the "nginx" image from Docker Hub.
Deleting an Image
To delete an unnecessary image, use the docker rmi command followed by the name or ID of the image.
For example, docker rmi myimage will delete the image named "myimage".
Note that to delete an image, no containers should be created from it and it should not be used by any running containers.
Listing Image
To list all existing image on your computer, use the docker image command. This command will display a list of image, including their names, versions, and sizes.
Please note that during the image creation or pulling process, Docker will download layers and related dependencies. Downloading image may take some time depending on the size of the image and your internet speed.
Refer to the Docker documentation for more detailed information on image management and other available options in Docker.