What are <none> repository and tags? Why do they appear when I use docker build? -


this docker images shows before run docker build.

$ docker images repository          tag                 image id            created             virtual size myapp               latest              a38da0bd9e0b        6 seconds ago       523.8 mb golang              onbuild             b4997c557048        10 days ago         517.2 mb

after make changes myapp source code, run docker build -t myapp . , end images named <none>.

$ docker images repository          tag                 image id            created                      virtual size myapp               latest              a38da0bd9e0b        less second ago ago   523.8 mb <none>              <none>              e4209f97e819        10 minutes ago               523.8 mb golang              onbuild             b4997c557048        10 days ago                  517.2 mb

i know can remove them docker rmi <image id>, why happen in first place? how can prevent happening? dockerfile i'm building looks this.

from golang:onbuild expose 8080

if reassign tag or image name image, image lose tag or name. it's simple. myapp repo image tagged latest id a38da0bd9e0b used named , tagged on image id e4209f97e819.


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