docker_container.py

# docker_container.py
from typing import Optional

import docker


class Docker:
    def is_container_running(self, container_name: str) -> Optional[bool]:
        """Verify the status of a container by it's name

        :param container_name: the name of the container
        :return: boolean or None
        """
        RUNNING = "running"
        # Connect to Docker using the default socket or the configuration
        # in your environment
        docker_client = docker.from_env()
        # Or give configuration
        # docker_socket = "unix://var/run/docker.sock"
        # docker_client = docker.DockerClient(docker_socket)

        try:
            container = docker_client.containers.get(container_name)
        except docker.errors.NotFound as exc:
            print(f"Check container name!\n{exc.explanation}")
        else:
            container_state = container.attrs["State"]
            return container_state["Status"] == RUNNING


if __name__ == "__main__":
    d = Docker()

    container_name = "localredis"
    result = d.is_container_running(container_name)
    print(result)

    container_name = "gcr.io/google.com/cloudsdktool/cloud-sdk"
    result = d.is_container_running(container_name)
    print(result)