manage docker images
Once you have installed docker its time to manage , pull , remove docker images.
What is an Image
Image is a file that comprise of multiple layers used to execute code in a docker. It is built from the instruction for a complete and executable version of an application.
Note it does rely on the OS kernel
There are more then 1500 images created by different application teams such as by apache , ngnix , mysql , mariadb , these are called official docker images. One of the biggest repositories for these official docker images is
https://hub.docker.com
.
Installing Images
Downloading and installing an image on docker in Linux is a very straight forward way with a single command,example ngnix
docker pull <package_name>
To pull a particular version of an image
docker pull <package_name>:package_version_detail
by default pull will grab the latest version of the package and same goes for removing the version with docker rmi <package_name>
To see all the images that are downloaded on your machine use the command
docker images
To delete an image you can type
docker rmi <package_name>:package_version_details
if no package version details are added it will delete the latest version of the package.