docker-logout - Log out from a Docker registry
docker logout [SERVER]
Log out of a Docker Registry located on the specified SERVER. You can
specify a URL or a hostname for the SERVER value. If you do not specify
a SERVER, the command attempts to log you out of Docker's public
registry located at https://registry-1.docker.io/ by default.
Log out from a registry on your localhost
# docker logout localhost:8080
docker-login(1) to log in to a Docker registry server.
Docker Community Sep 2017 DOCKER(1)