Why is the Docker image push not working?

The Docker push command uploads or pushes a local Docker image to a Docker registry. A Docker registry is a central repository where Docker images are stored and can be accessed by other users or systems.

Troubleshooting the problem

If you are having problems with the docker image push, here are a few things you can check to troubleshoot the issue:

• Logging in to a Docker registry: Ensure you are logged in to the registry you are trying to push to. Here's how you can do it:

Note: Replace <registry> with the URL of the Docker registry you want to log in to.

• Verify image existence: Make sure the image you are trying to push exists. To verify if a Docker image exists locally before attempting to push it, you can use the following command:

Note: This command will list all the Docker images on your local system. The output will include the repository, tag, image ID, created date, and size of each image.

• Validate image tag: Make sure the image is tagged correctly. The tag should match the repository name you are trying to push to. Here's how you can do it:

Note: Replace <image_name> with the name or ID of the Docker image you want to inspect.

• Check repository access: You must have write access to the repository you are pushing to. If you are pushing to a public repository, you do not need to worry about this. However, if you are pushing to a private repository, you will need to check with the repository owner to see if you have write access.

• Check network connection: If your network connection is not working, you will not be able to push the image. Here's how you can check:

Note: 

• If you receive successful responses with round-trip times, it indicates that your network connection is working properly.

• If you encounter request timeouts or receive error messages, it suggests that your network connection is experiencing issues.

If you have checked all of these things and your docker image push is still not working, you can try the following:

• Restart Docker daemon. It can sometimes fix problems with pushing images.

• Reinstall Docker. This is a more drastic step, but it can sometimes fix problems that cannot be solved by restarting the daemon.