Common causes
- Not logged in to the registry: docker login required before pushing
- The image tag doesn't match your registry namespace — must be username/reponame:tag
- Pushing to a repository owned by an organization you don't have push access to
- Login session expired — credentials stored in ~/.docker/config.json are stale
How to fix it
- Log in first: docker login (Docker Hub) or docker login registry.example.com
- Tag the image with your correct registry path: docker tag myimage username/myimage:latest
- Verify you have write access to the repository on Docker Hub or your registry
- For org repos, confirm you're a member with push rights: check the organization's Teams settings
Example
$ docker push myimage:latest
The push refers to repository [docker.io/library/myimage]
denied: requested access to the resource is deniedPushing without a username prefix — library/ is reserved for official Docker images
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