Local Check_MK check to check whether Docker container images are up to date

check_docker_images.py

#! /usr/bin/env python3

import docker

client = docker.from_env()

containers = client.containers.list(all=True)
outdated_containers = []

for container in containers:
    container_image = container.image

    container_image_tag = container_image.attrs["RepoTags"][0]
    container_image_digest = container_image.attrs["RepoDigests"][0].split("@")[-1]

    repo_image = client.images.get_registry_data(name=container_image_tag)

    if container_image_digest != repo_image.id:
        outdated_containers.append(container)

if outdated_containers:
    check_state = 1
    message = "Found {} outdated containers\\n{}".format(len(outdated_containers), "\\n".join(sorted([container.name for container in outdated_containers])))
else:
    check_state = 0
    message = "All containers are up to date"

print("{} Docker_Container_Updates containers={}|outdated={} {}".format(check_state, len(containers), len(outdated_containers), message))