On a sudden, it happens after lunch.
docker login
Username (moonsyim): moonsyim
WARNING: login credentials saved in /root/.docker/config.json
Login Succeeded
docker push moonsyim/ubuntu-keycloak-v1.5:1.1
The push refers to a repository [moonsyim/ubuntu-keycloak-v1.5] (len: 1)
d4ff59630aa1: Image push failed
Please login prior to push:
Username (moonsyim): moonsyim
WARNING: login credentials saved in /root/.docker/config.json
Login Succeeded
The push refers to a repository [moonsyim/ubuntu-keycloak-v1.5] (len: 1)
d4ff59630aa1: Image push failed
Error pushing to registry: Authentication is required.