#!/usr/bin/env python # Copyright 2015 Sam Yaple # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # FIXME(yoctozepto): this module does *not* validate "common_options" which are # a hacky way to seed most usages of kolla_docker in kolla-ansible ansible # playbooks - caution has to be exerted when setting "common_options" # FIXME(yoctozepto): restart_policy is *not* checked in the container import json import os import shlex import traceback import docker from ansible.module_utils.basic import AnsibleModule DOCUMENTATION = ''' --- module: kolla_docker short_description: Module for controlling Docker description: - A module targeting at controlling Docker as used by Kolla. options: common_options: description: - A dict containing common params such as login info required: False type: dict default: dict() action: description: - The action the module should take required: True type: str choices: - compare_container - compare_image - create_volume - ensure_image - get_container_env - get_container_state - pull_image - remove_container - remove_image - remove_volume - recreate_or_restart_container - restart_container - start_container - stop_container - stop_container_and_remove_container api_version: description: - The version of the api for docker-py to use when contacting docker required: False type: str default: auto auth_email: description: - The email address used to authenticate required: False type: str auth_password: description: - The password used to authenticate required: False type: str auth_registry: description: - The registry to authenticate required: False type: str auth_username: description: - The username used to authenticate required: False type: str command: description: - The command to execute in the container required: False type: str detach: description: - Detach from the container after it is created required: False default: True type: bool name: description: - Name of the container or volume to manage required: False type: str environment: description: - The environment to set for the container required: False type: dict image: description: - Name of the docker image required: False type: str ipc_mode: description: - Set docker ipc namespace required: False type: str default: None choices: - host cap_add: description: - Add capabilities to docker container required: False type: list default: list() security_opt: description: - Set container security profile required: False type: list default: list() labels: description: - List of labels to apply to container required: False type: dict default: dict() pid_mode: description: - Set docker pid namespace required: False type: str default: None choices: - host privileged: description: - Set the container to privileged required: False default: False type: bool remove_on_exit: description: - When not detaching from container, remove on successful exit required: False default: True type: bool restart_policy: description: - When docker restarts the container (does not affect checks) required: False type: str choices: - no - on-failure - always - unless-stopped restart_retries: description: - How many times to attempt a restart if 'on-failure' policy is set type: int default: 10 volumes: description: - Set volumes for docker to use required: False type: list volumes_from: description: - Name or id of container(s) to use volumes from required: True type: list state: description: - Check container status required: False type: str choices: - running - exited - paused tty: description: - Allocate TTY to container required: False default: False type: bool author: Sam Yaple ''' EXAMPLES = ''' - hosts: kolla_docker tasks: - name: Start container kolla_docker: image: ubuntu name: test_container action: start_container - name: Remove container kolla_docker: name: test_container action: remove_container - name: Pull image without starting container kolla_docker: action: pull_image image: private-registry.example.com:5000/ubuntu - name: Create named volume kolla_docker: action: create_volume name: name_of_volume - name: Remove named volume kolla_docker: action: remove_volume name: name_of_volume - name: Remove image kolla_docker: action: remove_image image: name_of_image ''' def get_docker_client(): return docker.APIClient class DockerWorker(object): def __init__(self, module): self.module = module self.params = self.module.params self.changed = False # Use this to store arguments to pass to exit_json(). self.result = {} # TLS not fully implemented # tls_config = self.generate_tls() options = { 'version': self.params.get('api_version') } self.dc = get_docker_client()(**options) def generate_tls(self): tls = {'verify': self.params.get('tls_verify')} tls_cert = self.params.get('tls_cert'), tls_key = self.params.get('tls_key'), tls_cacert = self.params.get('tls_cacert') if tls['verify']: if tls_cert: self.check_file(tls_cert) self.check_file(tls_key) tls['client_cert'] = (tls_cert, tls_key) if tls_cacert: self.check_file(tls_cacert) tls['verify'] = tls_cacert return docker.tls.TLSConfig(**tls) def check_file(self, path): if not os.path.isfile(path): self.module.fail_json( failed=True, msg='There is no file at "{}"'.format(path) ) if not os.access(path, os.R_OK): self.module.fail_json( failed=True, msg='Permission denied for file at "{}"'.format(path) ) def check_image(self): find_image = ':'.join(self.parse_image()) for image in self.dc.images(): repo_tags = image.get('RepoTags') if not repo_tags: continue for image_name in repo_tags: if image_name == find_image: return image def check_volume(self): for vol in self.dc.volumes()['Volumes'] or list(): if vol['Name'] == self.params.get('name'): return vol def check_container(self): find_name = '/{}'.format(self.params.get('name')) for cont in self.dc.containers(all=True): if find_name in cont['Names']: return cont def get_container_info(self): container = self.check_container() if not container: return None return self.dc.inspect_container(self.params.get('name')) def compare_container(self): container = self.check_container() if not container or self.check_container_differs(): self.changed = True return self.changed def check_container_differs(self): container_info = self.get_container_info() return ( self.compare_cap_add(container_info) or self.compare_security_opt(container_info) or self.compare_image(container_info) or self.compare_ipc_mode(container_info) or self.compare_labels(container_info) or self.compare_privileged(container_info) or self.compare_pid_mode(container_info) or self.compare_volumes(container_info) or self.compare_volumes_from(container_info) or self.compare_environment(container_info) or self.compare_container_state(container_info) or self.compare_dimensions(container_info) or self.compare_command(container_info) ) def compare_ipc_mode(self, container_info): new_ipc_mode = self.params.get('ipc_mode') current_ipc_mode = container_info['HostConfig'].get('IpcMode') if not current_ipc_mode: current_ipc_mode = None # only check IPC mode if it is specified if new_ipc_mode is not None and new_ipc_mode != current_ipc_mode: return True return False def compare_cap_add(self, container_info): new_cap_add = self.params.get('cap_add', list()) current_cap_add = container_info['HostConfig'].get('CapAdd', list()) if not current_cap_add: current_cap_add = list() if set(new_cap_add).symmetric_difference(set(current_cap_add)): return True def compare_security_opt(self, container_info): ipc_mode = self.params.get('ipc_mode') pid_mode = self.params.get('pid_mode') privileged = self.params.get('privileged', False) # NOTE(jeffrey4l) security opt is disabled when using host ipc mode or # host pid mode or privileged. So no need to compare security opts if ipc_mode == 'host' or pid_mode == 'host' or privileged: return False new_sec_opt = self.params.get('security_opt', list()) current_sec_opt = container_info['HostConfig'].get('SecurityOpt', list()) if not current_sec_opt: current_sec_opt = list() if set(new_sec_opt).symmetric_difference(set(current_sec_opt)): return True def compare_pid_mode(self, container_info): new_pid_mode = self.params.get('pid_mode') current_pid_mode = container_info['HostConfig'].get('PidMode') if not current_pid_mode: current_pid_mode = None if new_pid_mode != current_pid_mode: return True def compare_privileged(self, container_info): new_privileged = self.params.get('privileged') current_privileged = container_info['HostConfig']['Privileged'] if new_privileged != current_privileged: return True def compare_image(self, container_info=None): container_info = container_info or self.get_container_info() parse_repository_tag = docker.utils.parse_repository_tag if not container_info: return True new_image = self.check_image() current_image = container_info['Image'] if not new_image: return True if new_image['Id'] != current_image: return True # NOTE(Jeffrey4l) when new image and the current image have # the same id, but the tag name different. elif (parse_repository_tag(container_info['Config']['Image']) != parse_repository_tag(self.params.get('image'))): return True def compare_labels(self, container_info): new_labels = self.params.get('labels') current_labels = container_info['Config'].get('Labels', dict()) image_labels = self.check_image().get('Labels', dict()) for k, v in image_labels.items(): if k in new_labels: if v != new_labels[k]: return True else: del current_labels[k] if new_labels != current_labels: return True def compare_volumes_from(self, container_info): new_vols_from = self.params.get('volumes_from') current_vols_from = container_info['HostConfig'].get('VolumesFrom') if not new_vols_from: new_vols_from = list() if not current_vols_from: current_vols_from = list() if set(current_vols_from).symmetric_difference(set(new_vols_from)): return True def compare_volumes(self, container_info): volumes, binds = self.generate_volumes() current_vols = container_info['Config'].get('Volumes') current_binds = container_info['HostConfig'].get('Binds') if not volumes: volumes = list() if not current_vols: current_vols = list() if not current_binds: current_binds = list() if set(volumes).symmetric_difference(set(current_vols)): return True new_binds = list() if binds: for k, v in binds.items(): new_binds.append("{}:{}:{}".format(k, v['bind'], v['mode'])) if set(new_binds).symmetric_difference(set(current_binds)): return True def compare_environment(self, container_info): if self.params.get('environment'): current_env = dict() for kv in container_info['Config'].get('Env', list()): k, v = kv.split('=', 1) current_env.update({k: v}) for k, v in self.params.get('environment').items(): if k not in current_env: return True if current_env[k] != v: return True def compare_container_state(self, container_info): new_state = self.params.get('state') current_state = container_info['State'].get('Status') if new_state != current_state: return True def compare_dimensions(self, container_info): new_dimensions = self.params.get('dimensions') # NOTE(mgoddard): The names used by Docker are inconsisent between # configuration of a container's resources and the resources in # container_info['HostConfig']. This provides a mapping between the # two. dimension_map = { 'mem_limit': 'Memory', 'mem_reservation': 'MemoryReservation', 'memswap_limit': 'MemorySwap', 'cpu_period': 'CpuPeriod', 'cpu_quota': 'CpuQuota', 'cpu_shares': 'CpuShares', 'cpuset_cpus': 'CpusetCpus', 'cpuset_mems': 'CpusetMems', 'kernel_memory': 'KernelMemory', 'blkio_weight': 'BlkioWeight', 'ulimits': 'Ulimits'} unsupported = set(new_dimensions.keys()) - \ set(dimension_map.keys()) if unsupported: self.module.exit_json( failed=True, msg=repr("Unsupported dimensions"), unsupported_dimensions=unsupported) current_dimensions = container_info['HostConfig'] for key1, key2 in dimension_map.items(): # NOTE(mgoddard): If a resource has been explicitly requested, # check for a match. Otherwise, ensure is is set to the default. if key1 in new_dimensions: if key1 == 'ulimits': if self.compare_ulimits(new_dimensions[key1], current_dimensions[key2]): return True elif new_dimensions[key1] != current_dimensions[key2]: return True elif current_dimensions[key2]: # The default values of all currently supported resources are # '' or 0 - both falsey. return True def compare_ulimits(self, new_ulimits, current_ulimits): # The new_ulimits is dict, we need make it to a list of Ulimit # instance. new_ulimits = self.build_ulimits(new_ulimits) def key(ulimit): return ulimit['Name'] if current_ulimits is None: current_ulimits = [] return sorted(new_ulimits, key=key) != sorted(current_ulimits, key=key) def compare_command(self, container_info): new_command = self.params.get('command') if new_command is not None: new_command_split = shlex.split(new_command) new_path = new_command_split[0] new_args = new_command_split[1:] if (new_path != container_info['Path'] or new_args != container_info['Args']): return True def parse_image(self): full_image = self.params.get('image') if '/' in full_image: registry, image = full_image.split('/', 1) else: image = full_image if ':' in image: return full_image.rsplit(':', 1) else: return full_image, 'latest' def get_image_id(self): full_image = self.params.get('image') image = self.dc.images(name=full_image, quiet=True) return image[0] if len(image) == 1 else None def pull_image(self): if self.params.get('auth_username'): self.dc.login( username=self.params.get('auth_username'), password=self.params.get('auth_password'), registry=self.params.get('auth_registry'), email=self.params.get('auth_email') ) image, tag = self.parse_image() old_image_id = self.get_image_id() statuses = [ json.loads(line.strip().decode('utf-8')) for line in self.dc.pull( repository=image, tag=tag, stream=True ) ] for status in reversed(statuses): if 'error' in status: if status['error'].endswith('not found'): self.module.fail_json( msg="The requested image does not exist: {}:{}".format( image, tag), failed=True ) else: self.module.fail_json( msg="Unknown error message: {}".format( status['error']), failed=True ) new_image_id = self.get_image_id() self.changed = old_image_id != new_image_id def remove_container(self): if self.check_container(): self.changed = True # NOTE(jeffrey4l): in some case, docker failed to remove container # filesystem and raise error. But the container info is # disappeared already. If this happens, assume the container is # removed. try: self.dc.remove_container( container=self.params.get('name'), force=True ) except docker.errors.APIError: if self.check_container(): raise def generate_volumes(self): volumes = self.params.get('volumes') if not volumes: return None, None vol_list = list() vol_dict = dict() for vol in volumes: if len(vol) == 0: continue if ':' not in vol: vol_list.append(vol) continue split_vol = vol.split(':') if (len(split_vol) == 2 and ('/' not in split_vol[0] or '/' in split_vol[1])): split_vol.append('rw') vol_list.append(split_vol[1]) vol_dict.update({ split_vol[0]: { 'bind': split_vol[1], 'mode': split_vol[2] } }) return vol_list, vol_dict def parse_dimensions(self, dimensions): # When the data object contains types such as # docker.types.Ulimit, Ansible will fail when these are # returned via exit_json or fail_json. HostConfig is derived from dict, # but its constructor requires additional arguments. # to avoid that, here do copy the dimensions and return a new one. dimensions = dimensions.copy() supported = {'cpu_period', 'cpu_quota', 'cpu_shares', 'cpuset_cpus', 'cpuset_mems', 'mem_limit', 'mem_reservation', 'memswap_limit', 'kernel_memory', 'blkio_weight', 'ulimits'} unsupported = set(dimensions) - supported if unsupported: self.module.exit_json(failed=True, msg=repr("Unsupported dimensions"), unsupported_dimensions=unsupported) ulimits = dimensions.get('ulimits') if ulimits: dimensions['ulimits'] = self.build_ulimits(ulimits) return dimensions def build_ulimits(self, ulimits): ulimits_opt = [] for key, value in ulimits.items(): soft = value.get('soft') hard = value.get('hard') ulimits_opt.append(docker.types.Ulimit(name=key, soft=soft, hard=hard)) return ulimits_opt def build_host_config(self, binds): options = { 'network_mode': 'host', 'ipc_mode': self.params.get('ipc_mode'), 'cap_add': self.params.get('cap_add'), 'security_opt': self.params.get('security_opt'), 'pid_mode': self.params.get('pid_mode'), 'privileged': self.params.get('privileged'), 'volumes_from': self.params.get('volumes_from') } dimensions = self.params.get('dimensions') if dimensions: dimensions = self.parse_dimensions(dimensions) options.update(dimensions) restart_policy = self.params.get('restart_policy') if restart_policy is not None: restart_policy = {'Name': restart_policy} # NOTE(Jeffrey4l): MaximumRetryCount is only needed for on-failure # policy if restart_policy['Name'] == 'on-failure': retries = self.params.get('restart_retries') if retries is not None: restart_policy['MaximumRetryCount'] = retries options['restart_policy'] = restart_policy if binds: options['binds'] = binds return self.dc.create_host_config(**options) def _inject_env_var(self, environment_info): newenv = { 'KOLLA_SERVICE_NAME': self.params.get('name').replace('_', '-') } environment_info.update(newenv) return environment_info def _format_env_vars(self): env = self._inject_env_var(self.params.get('environment')) return {k: "" if env[k] is None else env[k] for k in env} def build_container_options(self): volumes, binds = self.generate_volumes() return { 'command': self.params.get('command'), 'detach': self.params.get('detach'), 'environment': self._format_env_vars(), 'host_config': self.build_host_config(binds), 'labels': self.params.get('labels'), 'image': self.params.get('image'), 'name': self.params.get('name'), 'volumes': volumes, 'tty': self.params.get('tty'), } def create_container(self): self.changed = True options = self.build_container_options() self.dc.create_container(**options) def recreate_or_restart_container(self): self.changed = True container = self.check_container() # get config_strategy from env environment = self.params.get('environment') config_strategy = environment.get('KOLLA_CONFIG_STRATEGY') if not container: self.start_container() return # If config_strategy is COPY_ONCE or container's parameters are # changed, try to start a new one. if config_strategy == 'COPY_ONCE' or self.check_container_differs(): # NOTE(mgoddard): Pull the image if necessary before stopping the # container, otherwise a failure to pull the image will leave the # container stopped. if not self.check_image(): self.pull_image() self.stop_container() self.remove_container() self.start_container() elif config_strategy == 'COPY_ALWAYS': self.restart_container() def start_container(self): if not self.check_image(): self.pull_image() container = self.check_container() if container and self.check_container_differs(): self.stop_container() self.remove_container() container = self.check_container() if not container: self.create_container() container = self.check_container() if not container['Status'].startswith('Up '): self.changed = True self.dc.start(container=self.params.get('name')) # We do not want to detach so we wait around for container to exit if not self.params.get('detach'): rc = self.dc.wait(self.params.get('name')) # NOTE(jeffrey4l): since python docker package 3.0, wait return a # dict all the time. if isinstance(rc, dict): rc = rc['StatusCode'] # Include container's return code, standard output and error in the # result. self.result['rc'] = rc self.result['stdout'] = self.dc.logs(self.params.get('name'), stdout=True, stderr=False) self.result['stderr'] = self.dc.logs(self.params.get('name'), stdout=False, stderr=True) if self.params.get('remove_on_exit'): self.stop_container() self.remove_container() if rc != 0: self.module.fail_json( changed=True, msg="Container exited with non-zero return code %s" % rc, **self.result ) def get_container_env(self): name = self.params.get('name') info = self.get_container_info() if not info: self.module.fail_json(msg="No such container: {}".format(name)) else: envs = dict() for env in info['Config']['Env']: if '=' in env: key, value = env.split('=', 1) else: key, value = env, '' envs[key] = value self.module.exit_json(**envs) def get_container_state(self): name = self.params.get('name') info = self.get_container_info() if not info: self.module.fail_json(msg="No such container: {}".format(name)) else: self.module.exit_json(**info['State']) def stop_container(self): name = self.params.get('name') graceful_timeout = self.params.get('graceful_timeout') if not graceful_timeout: graceful_timeout = 10 container = self.check_container() if not container: self.module.fail_json( msg="No such container: {} to stop".format(name)) elif not container['Status'].startswith('Exited '): self.changed = True self.dc.stop(name, timeout=graceful_timeout) def stop_and_remove_container(self): container = self.check_container() if container: self.stop_container() self.remove_container() def restart_container(self): name = self.params.get('name') graceful_timeout = self.params.get('graceful_timeout') if not graceful_timeout: graceful_timeout = 10 info = self.get_container_info() if not info: self.module.fail_json( msg="No such container: {}".format(name)) else: self.changed = True self.dc.stop(name, timeout=graceful_timeout) self.dc.start(name) def create_volume(self): if not self.check_volume(): self.changed = True self.dc.create_volume(name=self.params.get('name'), driver='local') def remove_volume(self): if self.check_volume(): self.changed = True try: self.dc.remove_volume(name=self.params.get('name')) except docker.errors.APIError as e: if e.response.status_code == 409: self.module.fail_json( failed=True, msg="Volume named '{}' is currently in-use".format( self.params.get('name') ) ) raise def remove_image(self): if self.check_image(): self.changed = True try: self.dc.remove_image(image=self.params.get('image')) except docker.errors.APIError as e: if e.response.status_code == 409: self.module.fail_json( failed=True, msg="Image '{}' is currently in-use".format( self.params.get('image') ) ) elif e.response.status_code == 500: self.module.fail_json( failed=True, msg="Server error" ) raise def ensure_image(self): if not self.check_image(): self.pull_image() def generate_module(): # NOTE(jeffrey4l): add empty string '' to choices let us use # pid_mode: "{{ service.pid_mode | default ('') }}" in yaml argument_spec = dict( common_options=dict(required=False, type='dict', default=dict()), action=dict(required=True, type='str', choices=['compare_container', 'compare_image', 'create_volume', 'ensure_image', 'get_container_env', 'get_container_state', 'pull_image', 'recreate_or_restart_container', 'remove_container', 'remove_image', 'remove_volume', 'restart_container', 'start_container', 'stop_container', 'stop_and_remove_container']), api_version=dict(required=False, type='str', default='auto'), auth_email=dict(required=False, type='str'), auth_password=dict(required=False, type='str', no_log=True), auth_registry=dict(required=False, type='str'), auth_username=dict(required=False, type='str'), command=dict(required=False, type='str'), detach=dict(required=False, type='bool', default=True), labels=dict(required=False, type='dict', default=dict()), name=dict(required=False, type='str'), environment=dict(required=False, type='dict'), image=dict(required=False, type='str'), ipc_mode=dict(required=False, type='str', choices=['', 'host', 'private', 'shareable']), cap_add=dict(required=False, type='list', default=list()), security_opt=dict(required=False, type='list', default=list()), pid_mode=dict(required=False, type='str', choices=['host', '']), privileged=dict(required=False, type='bool', default=False), graceful_timeout=dict(required=False, type='int', default=10), remove_on_exit=dict(required=False, type='bool', default=True), restart_policy=dict(required=False, type='str', choices=[ 'no', 'on-failure', 'always', 'unless-stopped']), restart_retries=dict(required=False, type='int', default=10), state=dict(required=False, type='str', default='running', choices=['running', 'exited', 'paused']), tls_verify=dict(required=False, type='bool', default=False), tls_cert=dict(required=False, type='str'), tls_key=dict(required=False, type='str'), tls_cacert=dict(required=False, type='str'), volumes=dict(required=False, type='list'), volumes_from=dict(required=False, type='list'), dimensions=dict(required=False, type='dict', default=dict()), tty=dict(required=False, type='bool', default=False), ) required_if = [ ['action', 'pull_image', ['image']], ['action', 'start_container', ['image', 'name']], ['action', 'compare_container', ['name']], ['action', 'compare_image', ['name']], ['action', 'create_volume', ['name']], ['action', 'ensure_image', ['image']], ['action', 'get_container_env', ['name']], ['action', 'get_container_state', ['name']], ['action', 'recreate_or_restart_container', ['name']], ['action', 'remove_container', ['name']], ['action', 'remove_image', ['image']], ['action', 'remove_volume', ['name']], ['action', 'restart_container', ['name']], ['action', 'stop_container', ['name']], ['action', 'stop_and_remove_container', ['name']], ] module = AnsibleModule( argument_spec=argument_spec, required_if=required_if, bypass_checks=False ) new_args = module.params.pop('common_options', dict()) # NOTE(jeffrey4l): merge the environment env = module.params.pop('environment', dict()) if env: new_args['environment'].update(env) for key, value in module.params.items(): if key in new_args and value is None: continue new_args[key] = value # if pid_mode = ""/None/False, remove it if not new_args.get('pid_mode', False): new_args.pop('pid_mode', None) # if ipc_mode = ""/None/False, remove it if not new_args.get('ipc_mode', False): new_args.pop('ipc_mode', None) module.params = new_args return module def main(): module = generate_module() dw = None try: dw = DockerWorker(module) # TODO(inc0): We keep it bool to have ansible deal with consistent # types. If we ever add method that will have to return some # meaningful data, we need to refactor all methods to return dicts. result = bool(getattr(dw, module.params.get('action'))()) module.exit_json(changed=dw.changed, result=result, **dw.result) except Exception: module.fail_json(changed=True, msg=repr(traceback.format_exc()), **getattr(dw, 'result', {})) if __name__ == '__main__': main()