`Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.24/images/create?fromImage=mysql&tag=latest: dial unix /var/run/docker.sock: connect: permission denied

The error message you encountered indicates that you were denied permission to connect to the Docker daemon socket. The Docker daemon socket is a communication endpoint that allows clients to interact with the Docker daemon, which is the background service responsible for managing Docker containers.

Here are the steps involved in the process:

  1. The client attempts to connect to the Docker daemon socket located at unix:///var/run/docker.sock. This socket is a Unix domain socket, a mechanism for inter-process communication on Unix-like operating systems.

  2. The client sends a POST request to the Docker daemon socket, specifically to the path /v1.24/images/create. This request is used to create a new Docker image.

  3. The request includes the image name (mysql) and tag (latest) in the query parameters. These parameters specify the image to be created.

  4. However, when the client tries to establish a connection to the Docker daemon socket, it encounters a "permission denied" error. This error occurs because the client does not have the necessary permissions to access the socket.

  5. The client's lack of permission prevents it from connecting to the Docker daemon socket, and therefore it cannot create the desired Docker image.

To resolve this issue, you can try the following steps:

  • Ensure that you are running the client with appropriate permissions. Typically, the client needs to have root or administrator privileges to access the Docker daemon socket.

  • Check the permissions of the Docker daemon socket file (/var/run/docker.sock). Make sure that the client has read and write permissions for this file. You can use the ls -l command to view the file permissions and chmod command to modify them if needed.

  • If you are running the client inside a Docker container, make sure that the container has the necessary capabilities to access the Docker daemon socket. You can specify the --privileged flag when running the container to grant it elevated privileges.

By addressing the permission issue, you should be able to connect to the Docker daemon socket and create Docker images successfully.