Docker images -a showing several images with repository <none> -


when use command docker ps -a lists several images repository <none>. i'm assuming they're related image given similar time stamp. i'm wondering purpose is?

repository          tag                 image id            created             virtual size opensuse            latest              33ab078b606b        5 days ago          254.6 mb mattgruter/drone    latest              ec2ee19cb579        2 weeks ago         312.4 mb <none>              <none>              69d95bd4b1f9        2 weeks ago         312.4 mb <none>              <none>              227d0f1e0dfa        2 weeks ago         312.4 mb <none>              <none>              a19dbed68faa        2 weeks ago         312.4 mb <none>              <none>              01ff591e80dc        2 weeks ago         312.4 mb <none>              <none>              89c0c546d2ba        2 weeks ago         312.4 mb <none>              <none>              030d18544ee4        2 weeks ago         279.1 mb <none>              <none>              1aaa2da8e8c2        2 weeks ago         271.6 mb <none>              <none>              c7928e43d1b3        2 weeks ago         269.9 mb <none>              <none>              0252973e04f0        2 weeks ago         268.6 mb <none>              <none>              2004ab1a6ca0        2 weeks ago         268.6 mb <none>              <none>              c26aae018d13        2 weeks ago         268.6 mb <none>              <none>              5707a16ae741        2 weeks ago         268.6 mb <none>              <none>              d959a0f0afef        2 weeks ago         268.6 mb <none>              <none>              bd654a62529d        2 weeks ago         268.6 mb <none>              <none>              bd52fe5f72a3        2 weeks ago         220.6 mb <none>              <none>              cd074038dbb7        2 weeks ago         209.2 mb <none>              <none>              4c12a68b82b3        2 weeks ago         188.3 mb <none>              <none>              f272e06028fd        2 weeks ago         188.3 mb <none>              <none>              6d4946999d4f        3 weeks ago         188.3 mb <none>              <none>              9fd3c8c9af32        3 weeks ago         188.3 mb <none>              <none>              435050075b3f        3 weeks ago         188.3 mb <none>              <none>              428b411c28f0        3 weeks ago         188.1 mb <none>              <none>              5b8dd08af89b        10 weeks ago        0 b

when build image docker creates temporary container move 1 step another. these "< none >" images else; created when build image same repository/tag 1 has been pulled. called dangling/untagged images. can clean them via:

docker rmi $(docker images -f "dangling=true" -q)

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