Well it's easy:
First list down all the images you have using this command:
$ docker images
Choose the image you want to make a container out of . for eg. if the image is ubuntu, Then use the below command to launch an ubuntu container:
$ docker run --name ubuntu-image ubuntu:latest
the above command follow the syntax:
$ docker run --name <name of the container> <name of the image>
With this command you have started your container, to view all the started containers use the below command:
$ docker ps
Hope this helped :)
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