docker-tidy/dockertidy/garbage_collector.py

334 lines
12 KiB
Python

#!/usr/bin/env python3
"""Remove unused docker containers and images."""
import fnmatch
from collections import namedtuple
import dateutil.parser
import docker.errors
import requests.exceptions
import docker
from dockertidy.config import SingleConfig
from dockertidy.logger import SingleLog
from dockertidy.parser import timedelta
class GarbageCollector:
"""Garbage collector object to handle cleanup tasks of container, images and volumes."""
# This seems to be something docker uses for a null/zero date
YEAR_ZERO = "0001-01-01T00:00:00Z"
ExcludeLabel = namedtuple("ExcludeLabel", ["key", "value"])
def __init__(self):
self.config = SingleConfig()
self.log = SingleLog()
self.logger = SingleLog().logger
self.docker = self._get_docker_client()
def cleanup_containers(self):
"""Identify old containers and remove them."""
config = self.config.config
client = self.docker
all_containers = self._get_all_containers()
filtered_containers = self._filter_excluded_containers(all_containers)
self.logger.info(
"Removing containers older than '{}'".format(
timedelta(config["gc"]["max_container_age"], dt_format="%Y-%m-%d, %H:%M:%S")
)
)
for container_summary in reversed(list(filtered_containers)):
container = self._api_call(
client.inspect_container,
container=container_summary["Id"],
)
if not container or not self._should_remove_container(
container,
timedelta(config["gc"]["max_container_age"]),
):
continue
self.logger.info(
"Removing container {} {} {}".format(
container["Id"][:16],
container.get("Name", "").lstrip("/"), container["State"]["FinishedAt"]
)
)
if not config["dry_run"]:
self._api_call(
client.remove_container,
container=container["Id"],
v=True,
)
def _filter_excluded_containers(self, containers):
config = self.config.config
if not config["gc"]["exclude_container_labels"]:
return containers
def include_container(container):
if self._should_exclude_container_with_labels(container):
return False
return True
return filter(include_container, containers)
def _should_exclude_container_with_labels(self, container):
config = self.config.config
if container["Labels"]:
for exclude_label in config["gc"]["exclude_container_labels"]:
if exclude_label.value:
matching_keys = fnmatch.filter(
container["Labels"].keys(),
exclude_label.key,
)
label_values_to_check = [
container["Labels"][matching_key] for matching_key in matching_keys
]
if fnmatch.filter(label_values_to_check, exclude_label.value):
return True
else:
if fnmatch.filter(container["Labels"].keys(), exclude_label.key):
return True
return False
def _should_remove_container(self, container, min_date):
state = container.get("State", {})
if state.get("Running"):
return False
if state.get("Ghost"):
return True
# Container was created, but never started
if state.get("FinishedAt") == self.YEAR_ZERO:
created_date = dateutil.parser.parse(container["Created"])
return created_date < min_date
finished_date = dateutil.parser.parse(state["FinishedAt"])
return finished_date < min_date
def _get_all_containers(self):
client = self.docker
self.logger.info("Getting all containers")
containers = client.containers(all=True)
self.logger.info("Found %s containers", len(containers))
return containers
def _get_all_images(self):
client = self.docker
self.logger.info("Getting all images")
images = client.images()
self.logger.info("Found %s images", len(images))
return images
def _get_dangling_volumes(self):
client = self.docker
self.logger.info("Getting dangling volumes")
volumes = client.volumes({"dangling": True})["Volumes"] or []
self.logger.info("Found %s dangling volumes", len(volumes))
return volumes
def cleanup_images(self, exclude_set):
"""Identify old images and remove them."""
# re-fetch container list so that we don't include removed containers
client = self.docker
config = self.config.config
containers = self._get_all_containers()
images = self._get_all_images()
if docker.utils.compare_version("1.21", client._version) < 0:
image_tags_in_use = {container["Image"] for container in containers}
images = self._filter_images_in_use(images, image_tags_in_use)
else:
# ImageID field was added in 1.21
image_ids_in_use = {container["ImageID"] for container in containers}
images = self._filter_images_in_use_by_id(images, image_ids_in_use)
images = self._filter_excluded_images(images, exclude_set)
self.logger.info(
"Removing images older than '{}'".format(
timedelta(config["gc"]["max_image_age"], dt_format="%Y-%m-%d, %H:%M:%S")
)
)
for image_summary in reversed(list(images)):
self._remove_image(image_summary, timedelta(config["gc"]["max_image_age"]))
def _filter_excluded_images(self, images, exclude_set):
def include_image(image_summary):
image_tags = image_summary.get("RepoTags")
if self._no_image_tags(image_tags):
return True
for exclude_pattern in exclude_set:
if fnmatch.filter(image_tags, exclude_pattern):
return False
return True
return filter(include_image, images)
def _filter_images_in_use(self, images, image_tags_in_use):
def get_tag_set(image_summary):
image_tags = image_summary.get("RepoTags")
if self._no_image_tags(image_tags):
# The repr of the image Id used by client.containers()
return set(["{id}:latest".format(id=image_summary["Id"][:12])])
return set(image_tags)
def image_not_in_use(image_summary):
return not get_tag_set(image_summary) & image_tags_in_use
return filter(image_not_in_use, images)
def _filter_images_in_use_by_id(self, images, image_ids_in_use):
def image_not_in_use(image_summary):
return image_summary["Id"] not in image_ids_in_use
return filter(image_not_in_use, images)
def _is_image_old(self, image, min_date):
return dateutil.parser.parse(image["Created"]) < min_date
def _no_image_tags(self, image_tags):
return not image_tags or image_tags == ["<none>:<none>"]
def _remove_image(self, image_summary, min_date):
config = self.config.config
client = self.docker
image = self._api_call(client.inspect_image, image=image_summary["Id"])
if not image or not self._is_image_old(image, min_date):
return
self.logger.info(
"Removing image {name}".format(name=self._format_image(image, image_summary))
)
if config["dry_run"]:
return
image_tags = image_summary.get("RepoTags")
# If there are no tags, remove the id
if self._no_image_tags(image_tags):
self._api_call(client.remove_image, image=image_summary["Id"])
return
# Remove any repository tags so we don't hit 409 Conflict
for image_tag in image_tags:
self._api_call(client.remove_image, image=image_tag)
def _remove_volume(self, volume):
config = self.config.config
client = self.docker
if not volume:
return
self.logger.info("Removing volume {name}".format(name=volume["Name"]))
if config["dry_run"]:
return
self._api_call(client.remove_volume, name=volume["Name"])
def cleanup_volumes(self):
"""Identify old volumes and remove them."""
dangling_volumes = self._get_dangling_volumes()
self.logger.info("Removing dangling volumes")
for volume in reversed(dangling_volumes):
self.logger.info("Removing dangling volume %s", volume["Name"])
self._remove_volume(volume)
def _api_call(self, func, **kwargs):
try:
return func(**kwargs)
except requests.exceptions.Timeout as e:
params = ",".join("%s=%s" % item for item in kwargs.items()) # noqa
self.logger.warn(
"Failed to call {name} {params} {msg}".format(
name=func.__name__, params=params, msg=str(e)
)
)
except docker.errors.APIError as e:
params = ",".join("%s=%s" % item for item in kwargs.items()) # noqa
self.logger.warn(
"Error calling {name} {params} {msg}".format(
name=func.__name__, params=params, msg=str(e)
)
)
def _format_image(self, image, image_summary):
def get_tags():
tags = image_summary.get("RepoTags")
if not tags or tags == ["<none>:<none>"]:
return ""
return ", ".join(tags)
return "{id} {tags}".format(id=image["Id"][:16], tags=get_tags())
def _build_exclude_set(self):
config = self.config.config
exclude_set = set(config["gc"]["exclude_images"])
def is_image_tag(line):
return line and not line.startswith("#")
return exclude_set
def _format_exclude_labels(self):
config = self.config.config
exclude_labels = []
for exclude_label_arg in config["gc"]["exclude_container_labels"]:
split_exclude_label = exclude_label_arg.split("=", 1)
exclude_label_key = split_exclude_label[0]
if len(split_exclude_label) == 2:
exclude_label_value = split_exclude_label[1]
else:
exclude_label_value = None
exclude_labels.append(
self.ExcludeLabel(
key=exclude_label_key,
value=exclude_label_value,
)
)
config["gc"]["exclude_container_labels"] = exclude_labels
def _get_docker_client(self):
config = self.config.config
try:
return docker.APIClient(version="auto", timeout=config["http_timeout"])
except docker.errors.DockerException as e:
self.log.sysexit_with_message("Can't create docker client\n{}".format(e))
def run(self):
"""Garbage collector main method."""
self.logger.info("Start garbage collection")
config = self.config.config
self._format_exclude_labels()
if config["gc"]["max_container_age"]:
self.cleanup_containers()
if config["gc"]["max_image_age"]:
exclude_set = self._build_exclude_set()
self.cleanup_images(exclude_set)
if config["gc"]["dangling_volumes"]:
self.cleanup_volumes()
if (
not config["gc"]["max_container_age"] and not config["gc"]["max_image_age"]
and not config["gc"]["dangling_volumes"]
):
self.logger.warn("Skipped, no arguments given")