526 lines
19 KiB
Python
526 lines
19 KiB
Python
# Copyright 2015 Sam Yaple
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# FIXME(yoctozepto): restart_policy is *not* checked in the container
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import docker
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import json
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import os
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from ansible.module_utils.kolla_container_worker import COMPARE_CONFIG_CMD
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from ansible.module_utils.kolla_container_worker import ContainerWorker
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from distutils.version import StrictVersion
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def get_docker_client():
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return docker.APIClient
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class DockerWorker(ContainerWorker):
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def __init__(self, module):
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super().__init__(module)
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options = {
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'version': self.params.get('api_version'),
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'timeout': self.params.get('client_timeout'),
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}
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self.dc = get_docker_client()(**options)
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self._cgroupns_mode_supported = (
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StrictVersion(self.dc._version) >= StrictVersion('1.41'))
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self._dimensions_kernel_memory_removed = (
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StrictVersion(self.dc._version) >= StrictVersion('1.42'))
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if self._dimensions_kernel_memory_removed:
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self.dimension_map.pop('kernel_memory', None)
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def generate_tls(self):
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tls = {'verify': self.params.get('tls_verify')}
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tls_cert = self.params.get('tls_cert'),
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tls_key = self.params.get('tls_key'),
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tls_cacert = self.params.get('tls_cacert')
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if tls['verify']:
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if tls_cert:
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self.check_file(tls_cert)
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self.check_file(tls_key)
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tls['client_cert'] = (tls_cert, tls_key)
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if tls_cacert:
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self.check_file(tls_cacert)
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tls['verify'] = tls_cacert
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return docker.tls.TLSConfig(**tls)
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def check_file(self, path):
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if not os.path.isfile(path):
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self.module.fail_json(
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failed=True,
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msg='There is no file at "{}"'.format(path)
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)
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if not os.access(path, os.R_OK):
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self.module.fail_json(
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failed=True,
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msg='Permission denied for file at "{}"'.format(path)
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)
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def check_image(self):
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find_image = ':'.join(self.parse_image())
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for image in self.dc.images():
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repo_tags = image.get('RepoTags')
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if not repo_tags:
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continue
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for image_name in repo_tags:
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if image_name == find_image:
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return image
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def check_volume(self):
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for vol in self.dc.volumes()['Volumes'] or list():
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if vol['Name'] == self.params.get('name'):
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return vol
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def check_container(self):
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find_name = '/{}'.format(self.params.get('name'))
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for cont in self.dc.containers(all=True):
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if find_name in cont['Names']:
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return cont
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def get_container_info(self):
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container = self.check_container()
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if not container:
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return None
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return self.dc.inspect_container(self.params.get('name'))
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def compare_pid_mode(self, container_info):
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new_pid_mode = self.params.get('pid_mode')
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current_pid_mode = container_info['HostConfig'].get('PidMode')
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if not current_pid_mode:
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current_pid_mode = None
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if new_pid_mode != current_pid_mode:
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return True
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def compare_image(self, container_info=None):
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container_info = container_info or self.get_container_info()
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parse_repository_tag = docker.utils.parse_repository_tag
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if not container_info:
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return True
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new_image = self.check_image()
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current_image = container_info['Image']
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if not new_image:
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return True
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if new_image['Id'] != current_image:
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return True
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# NOTE(Jeffrey4l) when new image and the current image have
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# the same id, but the tag name different.
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elif (parse_repository_tag(container_info['Config']['Image']) !=
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parse_repository_tag(self.params.get('image'))):
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return True
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def compare_volumes(self, container_info):
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volumes, binds = self.generate_volumes()
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current_vols = container_info['Config'].get('Volumes')
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current_binds = container_info['HostConfig'].get('Binds')
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if not volumes:
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volumes = list()
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if not current_vols:
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current_vols = list()
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if not current_binds:
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current_binds = list()
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if set(volumes).symmetric_difference(set(current_vols)):
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return True
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new_binds = list()
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if binds:
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for k, v in binds.items():
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new_binds.append("{}:{}:{}".format(k, v['bind'], v['mode']))
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if set(new_binds).symmetric_difference(set(current_binds)):
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return True
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def compare_config(self):
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try:
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job = self.dc.exec_create(
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self.params['name'],
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COMPARE_CONFIG_CMD,
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user='root',
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)
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output = self.dc.exec_start(job)
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exec_inspect = self.dc.exec_inspect(job)
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except docker.errors.APIError as e:
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# NOTE(yoctozepto): If we have a client error, then the container
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# cannot be used for config check (e.g., is restarting, or stopped
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# in the mean time) - assume config is stale = return True.
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# Else, propagate the server error back.
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if e.is_client_error():
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return True
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else:
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raise
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# Exit codes:
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# 0: not changed
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# 1: changed
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# 137: abrupt exit -> changed
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# else: error
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if exec_inspect['ExitCode'] == 0:
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return False
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elif exec_inspect['ExitCode'] == 1:
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return True
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elif exec_inspect['ExitCode'] == 137:
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# NOTE(yoctozepto): This is Docker's command exit due to container
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# exit. It means the container is unstable so we are better off
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# marking it as requiring a restart due to config update.
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return True
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else:
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raise Exception('Failed to compare container configuration: '
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'ExitCode: %s Message: %s' %
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(exec_inspect['ExitCode'], output))
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def get_image_id(self):
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full_image = self.params.get('image')
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image = self.dc.images(name=full_image, quiet=True)
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return image[0] if len(image) == 1 else None
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def pull_image(self):
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if self.params.get('auth_username'):
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self.dc.login(
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username=self.params.get('auth_username'),
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password=self.params.get('auth_password'),
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registry=self.params.get('auth_registry'),
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email=self.params.get('auth_email')
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)
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image, tag = self.parse_image()
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old_image_id = self.get_image_id()
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statuses = [
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json.loads(line.strip().decode('utf-8')) for line in self.dc.pull(
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repository=image, tag=tag, stream=True
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)
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]
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for status in reversed(statuses):
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if 'error' in status:
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if status['error'].endswith('not found'):
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self.module.fail_json(
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msg="The requested image does not exist: {}:{}".format(
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image, tag),
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failed=True
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)
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else:
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self.module.fail_json(
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msg="Unknown error message: {}".format(
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status['error']),
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failed=True
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)
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new_image_id = self.get_image_id()
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self.changed = old_image_id != new_image_id
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def remove_container(self):
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self.changed |= self.systemd.remove_unit_file()
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if self.check_container():
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self.changed = True
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# NOTE(jeffrey4l): in some case, docker failed to remove container
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# filesystem and raise error. But the container info is
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# disappeared already. If this happens, assume the container is
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# removed.
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try:
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self.dc.remove_container(
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container=self.params.get('name'),
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force=True
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)
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self.systemd.remove_unit_file()
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except docker.errors.APIError:
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if self.check_container():
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raise
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def parse_dimensions(self, dimensions):
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# When the data object contains types such as
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# docker.types.Ulimit, Ansible will fail when these are
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# returned via exit_json or fail_json. HostConfig is derived from dict,
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# but its constructor requires additional arguments.
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# to avoid that, here do copy the dimensions and return a new one.
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dimensions = dimensions.copy()
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supported = {'cpu_period', 'cpu_quota', 'cpu_shares',
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'cpuset_cpus', 'cpuset_mems', 'mem_limit',
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'mem_reservation', 'memswap_limit',
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'kernel_memory', 'blkio_weight', 'ulimits'}
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unsupported = set(dimensions) - supported
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if unsupported:
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self.module.exit_json(failed=True,
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msg=repr("Unsupported dimensions"),
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unsupported_dimensions=unsupported)
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ulimits = dimensions.get('ulimits')
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if ulimits:
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dimensions['ulimits'] = self.build_ulimits(ulimits)
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return dimensions
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def build_ulimits(self, ulimits):
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ulimits_opt = []
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for key, value in ulimits.items():
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soft = value.get('soft')
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hard = value.get('hard')
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ulimits_opt.append(docker.types.Ulimit(name=key,
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soft=soft,
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hard=hard))
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return ulimits_opt
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def build_host_config(self, binds):
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options = {
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'network_mode': 'host',
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'ipc_mode': self.params.get('ipc_mode'),
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'cap_add': self.params.get('cap_add'),
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'security_opt': self.params.get('security_opt'),
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'pid_mode': self.params.get('pid_mode'),
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'privileged': self.params.get('privileged'),
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'tmpfs': self.generate_tmpfs(),
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'volumes_from': self.params.get('volumes_from')
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}
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dimensions = self.params.get('dimensions')
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if dimensions:
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dimensions = self.parse_dimensions(dimensions)
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options.update(dimensions)
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if binds:
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options['binds'] = binds
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host_config = self.dc.create_host_config(**options)
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if self._cgroupns_mode_supported:
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# NOTE(yoctozepto): python-docker does not support CgroupnsMode
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# natively so we stuff it in manually.
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cgroupns_mode = self.params.get('cgroupns_mode')
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if cgroupns_mode is not None:
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host_config['CgroupnsMode'] = cgroupns_mode
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# detached containers should only log to journald
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if self.params.get('detach'):
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options['log_config'] = docker.types.LogConfig(
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type=docker.types.LogConfig.types.NONE)
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return host_config
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def _inject_env_var(self, environment_info):
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newenv = {
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'KOLLA_SERVICE_NAME': self.params.get('name').replace('_', '-')
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}
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environment_info.update(newenv)
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return environment_info
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def _format_env_vars(self):
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env = self._inject_env_var(self.params.get('environment'))
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return {k: "" if env[k] is None else env[k] for k in env}
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def build_container_options(self):
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volumes, binds = self.generate_volumes()
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options = {
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'command': self.params.get('command'),
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'detach': self.params.get('detach'),
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'environment': self._format_env_vars(),
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'host_config': self.build_host_config(binds),
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'labels': self.params.get('labels'),
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'image': self.params.get('image'),
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'name': self.params.get('name'),
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'volumes': volumes,
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'tty': self.params.get('tty'),
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}
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healthcheck = self.parse_healthcheck(self.params.get('healthcheck'))
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if healthcheck:
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options.update(healthcheck)
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return options
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def create_container(self):
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self.changed = True
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options = self.build_container_options()
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self.dc.create_container(**options)
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if self.params.get('restart_policy') != 'no':
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self.changed |= self.systemd.create_unit_file()
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def recreate_or_restart_container(self):
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self.changed = True
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container = self.check_container()
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# get config_strategy from env
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environment = self.params.get('environment')
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config_strategy = environment.get('KOLLA_CONFIG_STRATEGY')
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if not container:
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self.start_container()
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return
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# If config_strategy is COPY_ONCE or container's parameters are
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# changed, try to start a new one.
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if config_strategy == 'COPY_ONCE' or self.check_container_differs():
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# NOTE(mgoddard): Pull the image if necessary before stopping the
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# container, otherwise a failure to pull the image will leave the
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# container stopped.
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if not self.check_image():
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self.pull_image()
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self.stop_container()
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self.remove_container()
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self.start_container()
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elif config_strategy == 'COPY_ALWAYS':
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self.restart_container()
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def start_container(self):
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if not self.check_image():
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self.pull_image()
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container = self.check_container()
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if container and self.check_container_differs():
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self.stop_container()
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self.remove_container()
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container = self.check_container()
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if not container:
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self.create_container()
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container = self.check_container()
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if not container['Status'].startswith('Up '):
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self.changed = True
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if self.params.get('restart_policy') == 'no':
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self.dc.start(container=self.params.get('name'))
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else:
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self.systemd.create_unit_file()
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if not self.systemd.start():
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self.module.fail_json(
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changed=True,
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msg="Container timed out",
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**self.check_container())
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# We do not want to detach so we wait around for container to exit
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if not self.params.get('detach'):
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rc = self.dc.wait(self.params.get('name'))
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# NOTE(jeffrey4l): since python docker package 3.0, wait return a
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# dict all the time.
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if isinstance(rc, dict):
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rc = rc['StatusCode']
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# Include container's return code, standard output and error in the
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# result.
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self.result['rc'] = rc
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self.result['stdout'] = self.dc.logs(self.params.get('name'),
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stdout=True, stderr=False)
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self.result['stderr'] = self.dc.logs(self.params.get('name'),
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stdout=False, stderr=True)
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if self.params.get('remove_on_exit'):
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self.stop_container()
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self.remove_container()
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if rc != 0:
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self.module.fail_json(
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changed=True,
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msg="Container exited with non-zero return code %s" % rc,
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**self.result
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)
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def stop_container(self):
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name = self.params.get('name')
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graceful_timeout = self.params.get('graceful_timeout')
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if not graceful_timeout:
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graceful_timeout = 10
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container = self.check_container()
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if not container:
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ignore_missing = self.params.get('ignore_missing')
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if not ignore_missing:
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self.module.fail_json(
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msg="No such container: {} to stop".format(name))
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elif not container['Status'].startswith('Exited '):
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self.changed = True
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if self.params.get('restart_policy') != 'no':
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self.systemd.create_unit_file()
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self.systemd.stop()
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else:
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self.dc.stop(name, timeout=graceful_timeout)
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def stop_and_remove_container(self):
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container = self.check_container()
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if container:
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self.stop_container()
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self.remove_container()
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def restart_container(self):
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name = self.params.get('name')
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graceful_timeout = self.params.get('graceful_timeout')
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if not graceful_timeout:
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graceful_timeout = 10
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info = self.get_container_info()
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if not info:
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self.module.fail_json(
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msg="No such container: {}".format(name))
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else:
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self.changed = True
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if self.params.get('restart_policy') != 'no':
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self.systemd.create_unit_file()
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if not self.systemd.restart():
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self.module.fail_json(
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changed=True,
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msg="Container timed out",
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**self.check_container())
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else:
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self.dc.stop(name, timeout=graceful_timeout)
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self.dc.start(name)
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def create_volume(self):
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if not self.check_volume():
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self.changed = True
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self.dc.create_volume(name=self.params.get('name'), driver='local')
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def remove_volume(self):
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if self.check_volume():
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self.changed = True
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try:
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self.dc.remove_volume(name=self.params.get('name'))
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except docker.errors.APIError as e:
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if e.response.status_code == 409:
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self.module.fail_json(
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failed=True,
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msg="Volume named '{}' is currently in-use".format(
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self.params.get('name')
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)
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)
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raise
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def remove_image(self):
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if self.check_image():
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self.changed = True
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try:
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self.dc.remove_image(image=self.params.get('image'))
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except docker.errors.APIError as e:
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if e.response.status_code == 409:
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self.module.fail_json(
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failed=True,
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msg="Image '{}' is currently in-use".format(
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self.params.get('image')
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)
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)
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elif e.response.status_code == 500:
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self.module.fail_json(
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failed=True,
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msg="Server error"
|
|
)
|
|
raise
|
|
|
|
def ensure_image(self):
|
|
if not self.check_image():
|
|
self.pull_image()
|