Buildah: is used to build Open Container Initiative (OCI) format or Docker format container images without the need for a daemon.
Podman: provides the ability to directly run container images without a daemon. Podman can pull container images from a container registry, if they are not available locally.
Skopeo: offers features for pulling and pushing containers to registries. Moving containers between registries is supported. Container image inspection is also offered and some introspective capabilities can be performed, without first downloading the container itself.
1# see images available on your hosts
2docker image list
3
4# equal to above
5docker images
6REPOSITORY TAG IMAGE ID CREATED SIZE
7httpd latest 6fa26f20557b 45 hours ago 164MB
8hello-world latest 75280d40a50b 4 months ago 1.69kB
9
10# give sha
11docker images --no-trunc=true
12
13# delete unused images
14docker rmi $(docker images -q)
15# delete images without tags
16docker rmi $(docker images | grep "^<none>" | awk '{print $3}')