#!/usr/bin/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. 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_image - create_volume - get_container_env - get_container_state - pull_image - remove_container - remove_volume - restart_container - start_container - stop_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 to required: False type: str auth_username: description: - The username used to authenticate 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 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: - Determine what docker does when the container exits required: False type: str choices: - never - on-failure - always restart_retries: description: - How many times to attempt a restart if restart_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 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_container image: private-registry.example.com:5000/ubuntu - name: Create named volume action: create_volume name: name_of_volume - name: Remove named volume action: remove_volume name: name_of_volume ''' import os import docker class DockerWorker(object): def __init__(self, module): self.module = module self.params = self.module.params self.changed = False # TLS not fully implemented # tls_config = self.generate_tls() options = { 'version': self.params.get('api_version') } self.dc = 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 tlscert: self.check_file(tls['tls_cert']) self.check_file(tls['tls_key']) tls['client_cert'] = (tls_cert, tls_key) if tlscacert: self.check_file(tls['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(): for image_name in image['RepoTags']: 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 check_container_differs(self): container_info = self.get_container_info() return ( self.compare_image(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) ) 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() 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 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.iteritems(): 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.iteritems(): 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').iteritems(): if k not in current_env: return True if current_env[k] != v: 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 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() statuses = [ json.loads(line.strip()) 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 ) if status and status.get('status'): # NOTE(SamYaple): This allows us to use v1 and v2 docker # registries. Eventually docker will stop supporting v1 # registries and when that happens we can remove this. if 'legacy registry' in status['status']: continue elif 'Downloaded newer image for' in status['status']: self.changed = True return elif 'Image is up to date for' in status['status']: return else: self.module.fail_json( msg="Unknown status message: {}".format( status['status']), failed=True ) def remove_container(self): if self.check_container(): self.changed = True self.dc.remove_container( container=self.params.get('name'), force=True ) 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 ':' 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 build_host_config(self, binds): options = { 'network_mode': 'host', 'pid_mode': self.params.get('pid_mode'), 'privileged': self.params.get('privileged'), 'volumes_from': self.params.get('volumes_from') } if self.params.get('restart_policy') in ['on-failure', 'always']: options['restart_policy'] = { 'Name': self.params.get('restart_policy'), 'MaximumRetryCount': self.params.get('restart_retries') } if binds: options['binds'] = binds return self.dc.create_host_config(**options) def build_container_options(self): volumes, binds = self.generate_volumes() return { 'detach': self.params.get('detach'), 'environment': self.params.get('environment'), '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': True } def create_container(self): self.changed = True options = self.build_container_options() self.dc.create_container(**options) def start_container(self): if not self.check_image(): self.pull_image() container = self.check_container() if container and self.check_container_differs(): 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')) if rc != 0: self.module.fail_json( failed=True, changed=True, msg="Container exited with non-zero return code" ) if self.params.get('remove_on_exit'): self.remove_container() 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') container = self.check_container() if not container['Status'].startswith('Exited '): self.changed = True self.dc.stop(name) def restart_container(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.changed = True self.dc.restart(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 generate_module(): argument_spec = dict( common_options=dict(required=False, type='dict', default=dict()), action=dict(requried=True, type='str', choices=['compare_image', 'create_volume', 'get_container_env', 'get_container_state', 'pull_image', 'remove_container', 'remove_volume', 'restart_container', 'start_container', 'stop_container']), api_version=dict(required=False, type='str', default='auto'), auth_email=dict(required=False, type='str'), auth_password=dict(required=False, type='str'), auth_registry=dict(required=False, type='str'), auth_username=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'), pid_mode=dict(required=False, type='str', choices=['host']), privileged=dict(required=False, type='bool', default=False), remove_on_exit=dict(required=False, type='bool', default=True), restart_policy=dict(required=False, type='str', choices=['no', 'never', 'on-failure', 'always']), restart_retries=dict(required=False, type='int', default=10), 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') ) required_together = [ ['tls_cert', 'tls_key'] ] return AnsibleModule( argument_spec=argument_spec, required_together=required_together ) def generate_nested_module(): module = generate_module() # We unnest the common dict and the update it with the other options new_args = module.params.get('common_options') new_args.update(module._load_params()[0]) module.params = new_args # Override ARGS to ensure new args are used global MODULE_ARGS global MODULE_COMPLEX_ARGS MODULE_ARGS = '' MODULE_COMPLEX_ARGS = json.dumps(module.params) # Reprocess the args now that the common dict has been unnested return generate_module() def main(): module = generate_nested_module() # TODO(SamYaple): Replace with required_if when Ansible 2.0 lands if (module.params.get('action') in ['pull_image', 'start_container'] and not module.params.get('image')): self.module.fail_json( msg="missing required arguments: image", failed=True ) # TODO(SamYaple): Replace with required_if when Ansible 2.0 lands if (module.params.get('action') != 'pull_image' and not module.params.get('name')): self.module.fail_json( msg="missing required arguments: name", failed=True ) try: dw = DockerWorker(module) # TODO(inc0): We keep it bool to have ansible deal with cosistent # 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) except Exception as e: module.exit_json(failed=True, changed=True, msg=repr(e)) # import module snippets from ansible.module_utils.basic import * # noqa if __name__ == '__main__': main()