On the test machine, this didn't remove any images.ĭocker image prune -a removes all images not used by containers. This command also requires us to enter y and press Enter to proceed: WARNING! This will remove all dangling images. docker image prune removes these dangling images: docker image prune If no other Docker image extended alpine:3.12, then Docker would consider alpine:3.12 a so-called “dangling image”: A once implicitly downloaded image that's now not needed anymore. Now let's say we removed the PostgreSQL 13 beta 2 image. We don't see these implicitly downloaded images with docker image ls. That's why Docker implicitly downloaded alpine:3.12 when we pulled the beta 2 image at first. Let's look at the top of the Dockerfile for the PostgreSQL beta 2 image to see what image it's extending: FROM alpine:3.12 Our Docker images extend other images to gain their functionality, just as Java classes extend other Java classes. Now we need need to discuss image relationships briefly. So on the test machine, this removed one stopped container. WARNING! This will remove all stopped containers.Īre you sure you want to continue? yġc3be3eba8837323820ecac5b82e84ab65ad6d24a259374d354fd561254fd12f
#DOCKER REMOVE CONTAINER BY IMAGE ID PASSWORD#
We set secr3t as the password for the database root user because the PostgreSQL container won't start without one: docker run -d -e POSTGRES_PASSWORD=secr3t postgres:13-beta2-alpineĭocker ps -format 'table ' | grep '^postgres:13-beta' Next, locate the ID of the image that you want to remove and run the following command: docker image.
Let's start a container with the PostgreSQL 13 beta 2 image. Docker images are used to build a docker container.