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ansible/cloud/lxd/lxd_container.py

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2016, Hiroaki Nakamura <hnakamur@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
DOCUMENTATION = '''
---
module: lxd_container
short_description: Manage LXD Containers
version_added: 2.2.0
description:
- Management of LXD containers
author: "Hiroaki Nakamura (@hnakamur)"
options:
name:
description:
- Name of a container.
required: true
architecture:
description:
- The archiecture for the container (e.g. "x86_64" or "i686").
See U(https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1)
required: false
config:
description:
- 'The config for the container (e.g. {"limits.cpu": "2"}).
See U(https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1)'
- If the container already exists and its "config" value in metadata
obtained from
GET /1.0/containers/<name>
U(https://github.com/lxc/lxd/blob/master/doc/rest-api.md#10containersname)
are different, they this module tries to apply the configurations.
- The key starts with 'volatile.' are ignored for this comparison.
- Not all config values are supported to apply the existing container.
Maybe you need to delete and recreate a container.
required: false
devices:
description:
- 'The devices for the container
(e.g. { "rootfs": { "path": "/dev/kvm", "type": "unix-char" }).
See U(https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1)'
required: false
ephemeral:
description:
- Whether or not the container is ephemeral (e.g. true or false).
See U(https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1)
required: false
source:
description:
- 'The source for the container
(e.g. { "type": "image",
"mode": "pull",
"server": "https://images.linuxcontainers.org",
"protocol": "lxd",
"alias": "ubuntu/xenial/amd64" }).
See U(https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1)'
required: false
state:
choices:
- started
- stopped
- restarted
- absent
- frozen
description:
- Define the state of a container.
required: false
default: started
timeout:
description:
- A timeout for changing the state of the container.
- This is also used as a timeout for waiting until IPv4 addresses
are set to the all network interfaces in the container after
starting or restarting.
required: false
default: 30
wait_for_ipv4_addresses:
description:
- If this is true, the M(lxd_container) waits until IPv4 addresses
are set to the all network interfaces in the container after
starting or restarting.
required: false
default: false
force_stop:
description:
- If this is true, the M(lxd_container) forces to stop the container
when it stops or restarts the container.
required: false
default: false
url:
description:
- The unix domain socket path or the https URL for the LXD server.
required: false
default: unix:/var/lib/lxd/unix.socket
key_file:
description:
- The client certificate key file path.
required: false
default: '"{}/.config/lxc/client.key" .format(os.environ["HOME"])'
cert_file:
description:
- The client certificate file path.
required: false
default: '"{}/.config/lxc/client.crt" .format(os.environ["HOME"])'
trust_password:
description:
- The client trusted password.
- You need to set this password on the LXD server before
running this module using the following command.
lxc config set core.trust_password <some random password>
See U(https://www.stgraber.org/2016/04/18/lxd-api-direct-interaction/)
- If trust_password is set, this module send a request for
authentication before sending any requests.
required: false
notes:
- Containers must have a unique name. If you attempt to create a container
with a name that already existed in the users namespace the module will
simply return as "unchanged".
- There are two ways to can run commands in containers, using the command
module or using the ansible lxd connection plugin bundled in Ansible >=
2.1, the later requires python to be installed in the container which can
be done with the command module.
- You can copy a file from the host to the container
with the Ansible M(copy) and M(templater) module and the `lxd` connection plugin.
See the example below.
- You can copy a file in the creatd container to the localhost
with `command=lxc file pull container_name/dir/filename filename`.
See the first example below.
'''
EXAMPLES = '''
# An example for creating a Ubuntu container and install python
- hosts: localhost
connection: local
tasks:
- name: Create a started container
lxd_container:
name: mycontainer
state: started
source:
type: image
mode: pull
server: https://images.linuxcontainers.org
protocol: lxd
alias: ubuntu/xenial/amd64
profiles: ["default"]
wait_for_ipv4_addresses: true
timeout: 600
- name: check python is installed in container
delegate_to: mycontainer
raw: dpkg -s python
register: python_install_check
failed_when: python_install_check.rc not in [0, 1]
changed_when: false
- name: install python in container
delegate_to: mycontainer
raw: apt-get install -y python
when: python_install_check.rc == 1
# An example for deleting a container
- hosts: localhost
connection: local
tasks:
- name: Restart a container
lxd_container:
name: mycontainer
state: restarted
# An example for restarting a container
- hosts: localhost
connection: local
tasks:
- name: Restart a container
lxd_container:
name: mycontainer
state: restarted
# An example for restarting a container using https to connect to the LXD server
- hosts: localhost
connection: local
tasks:
- name: Restart a container
lxd_container:
url: https://127.0.0.1:8443
# These cert_file and key_file values are equal to the default values.
#cert_file: "{{ lookup('env', 'HOME') }}/.config/lxc/client.crt"
#key_file: "{{ lookup('env', 'HOME') }}/.config/lxc/client.key"
trust_password: mypassword
name: mycontainer
state: restarted
# Note your container must be in the inventory for the below example.
#
# [containers]
# mycontainer ansible_connection=lxd
#
- hosts:
- mycontainer
tasks:
- name: copy /etc/hosts in the created container to localhost with name "mycontainer-hosts"
fetch:
src: /etc/hosts
dest: /tmp/mycontainer-hosts
flat: true
'''
RETURN='''
addresses:
description: Mapping from the network device name to a list of IPv4 addresses in the container
returned: when state is started or restarted
type: object
sample: {"eth0": ["10.155.92.191"]}
old_state:
description: The old state of the container
returned: when state is started or restarted
type: string
sample: "stopped"
logs:
description: The logs of requests and responses.
returned: when ansible-playbook is invoked with -vvvv.
type: list
sample: "(too long to be placed here)"
actions:
description: List of actions performed for the container.
returned: success
type: list
sample: '["create", "start"]'
'''
import os
from ansible.modules.extras.cloud.lxd import LXDClient, LXDClientException
# LXD_ANSIBLE_STATES is a map of states that contain values of methods used
# when a particular state is evoked.
LXD_ANSIBLE_STATES = {
'started': '_started',
'stopped': '_stopped',
'restarted': '_restarted',
'absent': '_destroyed',
'frozen': '_frozen'
}
# ANSIBLE_LXD_STATES is a map of states of lxd containers to the Ansible
# lxc_container module state parameter value.
ANSIBLE_LXD_STATES = {
'Running': 'started',
'Stopped': 'stopped',
'Frozen': 'frozen',
}
# CONFIG_PARAMS is a list of config attribute names.
CONFIG_PARAMS = [
'architecture', 'config', 'devices', 'ephemeral', 'profiles', 'source'
]
try:
callable(all)
except NameError:
# For python <2.5
# This definition is copied from https://docs.python.org/2/library/functions.html#all
def all(iterable):
for element in iterable:
if not element:
return False
return True
class LXDContainerManagement(object):
def __init__(self, module):
"""Management of LXC containers via Ansible.
:param module: Processed Ansible Module.
:type module: ``object``
"""
self.module = module
self.name = self.module.params['name']
self._build_config()
self.state = self.module.params['state']
self.timeout = self.module.params['timeout']
self.wait_for_ipv4_addresses = self.module.params['wait_for_ipv4_addresses']
self.force_stop = self.module.params['force_stop']
self.addresses = None
self.url = self.module.params['url']
self.key_file = self.module.params.get('key_file', None)
self.cert_file = self.module.params.get('cert_file', None)
self.debug = self.module._verbosity >= 4
try:
self.client = LXDClient(
self.url, key_file=self.key_file, cert_file=self.cert_file,
debug=self.debug
)
except LXDClientException as e:
self.module.fail_json(msg=e.msg)
self.trust_password = self.module.params.get('trust_password', None)
self.actions = []
def _build_config(self):
self.config = {}
for attr in CONFIG_PARAMS:
param_val = self.module.params.get(attr, None)
if param_val is not None:
self.config[attr] = param_val
def _get_container_json(self):
return self.client.do(
'GET', '/1.0/containers/{0}'.format(self.name),
ok_error_codes=[404]
)
def _get_container_state_json(self):
return self.client.do(
'GET', '/1.0/containers/{0}/state'.format(self.name),
ok_error_codes=[404]
)
@staticmethod
def _container_json_to_module_state(resp_json):
if resp_json['type'] == 'error':
return 'absent'
return ANSIBLE_LXD_STATES[resp_json['metadata']['status']]
def _change_state(self, action, force_stop=False):
body_json={'action': action, 'timeout': self.timeout}
if force_stop:
body_json['force'] = True
return self.client.do('PUT', '/1.0/containers/{0}/state'.format(self.name), body_json=body_json)
def _create_container(self):
config = self.config.copy()
config['name'] = self.name
self.client.do('POST', '/1.0/containers', config)
self.actions.append('create')
def _start_container(self):
self._change_state('start')
self.actions.append('start')
def _stop_container(self):
self._change_state('stop', self.force_stop)
self.actions.append('stop')
def _restart_container(self):
self._change_state('restart', self.force_stop)
self.actions.append('restart')
def _delete_container(self):
return self.client.do('DELETE', '/1.0/containers/{0}'.format(self.name))
self.actions.append('delete')
def _freeze_container(self):
self._change_state('freeze')
self.actions.append('freeze')
def _unfreeze_container(self):
self._change_state('unfreeze')
self.actions.append('unfreez')
def _container_ipv4_addresses(self, ignore_devices=['lo']):
resp_json = self._get_container_state_json()
network = resp_json['metadata']['network'] or {}
network = dict((k, v) for k, v in network.items() if k not in ignore_devices) or {}
addresses = dict((k, [a['address'] for a in v['addresses'] if a['family'] == 'inet']) for k, v in network.items()) or {}
return addresses
@staticmethod
def _has_all_ipv4_addresses(addresses):
return len(addresses) > 0 and all([len(v) > 0 for v in addresses.itervalues()])
def _get_addresses(self):
try:
due = datetime.datetime.now() + datetime.timedelta(seconds=self.timeout)
while datetime.datetime.now() < due:
time.sleep(1)
addresses = self._container_ipv4_addresses()
if self._has_all_ipv4_addresses(addresses):
self.addresses = addresses
return
except LXDClientException as e:
e.msg = 'timeout for getting IPv4 addresses'
raise
def _started(self):
if self.old_state == 'absent':
self._create_container()
self._start_container()
else:
if self.old_state == 'frozen':
self._unfreeze_container()
elif self.old_state == 'stopped':
self._start_container()
if self._needs_to_apply_container_configs():
self._apply_container_configs()
if self.wait_for_ipv4_addresses:
self._get_addresses()
def _stopped(self):
if self.old_state == 'absent':
self._create_container()
else:
if self.old_state == 'stopped':
if self._needs_to_apply_container_configs():
self._start_container()
self._apply_container_configs()
self._stop_container()
else:
if self.old_state == 'frozen':
self._unfreeze_container()
if self._needs_to_apply_container_configs():
self._apply_container_configs()
self._stop_container()
def _restarted(self):
if self.old_state == 'absent':
self._create_container()
self._start_container()
else:
if self.old_state == 'frozen':
self._unfreeze_container()
if self._needs_to_apply_container_configs():
self._apply_container_configs()
self._restart_container()
if self.wait_for_ipv4_addresses:
self._get_addresses()
def _destroyed(self):
if self.old_state != 'absent':
if self.old_state == 'frozen':
self._unfreeze_container()
self._stop_container()
self._delete_container()
def _frozen(self):
if self.old_state == 'absent':
self._create_container()
self._start_container()
self._freeze_container()
else:
if self.old_state == 'stopped':
self._start_container()
if self._needs_to_apply_container_configs():
self._apply_container_configs()
self._freeze_container()
def _needs_to_change_container_config(self, key):
if key not in self.config:
return False
if key == 'config':
old_configs = dict((k, v) for k, v in self.old_container_json['metadata'][key].items() if not k.startswith('volatile.'))
else:
old_configs = self.old_container_json['metadata'][key]
return self.config[key] != old_configs
def _needs_to_apply_container_configs(self):
return (
self._needs_to_change_container_config('architecture') or
self._needs_to_change_container_config('config') or
self._needs_to_change_container_config('ephemeral') or
self._needs_to_change_container_config('devices') or
self._needs_to_change_container_config('profiles')
)
def _apply_container_configs(self):
old_metadata = self.old_container_json['metadata']
body_json = {
'architecture': old_metadata['architecture'],
'config': old_metadata['config'],
'devices': old_metadata['devices'],
'profiles': old_metadata['profiles']
}
if self._needs_to_change_container_config('architecture'):
body_json['architecture'] = self.config['architecture']
if self._needs_to_change_container_config('config'):
for k, v in self.config['config'].items():
body_json['config'][k] = v
if self._needs_to_change_container_config('ephemeral'):
body_json['ephemeral'] = self.config['ephemeral']
if self._needs_to_change_container_config('devices'):
body_json['devices'] = self.config['devices']
if self._needs_to_change_container_config('profiles'):
body_json['profiles'] = self.config['profiles']
self.client.do('PUT', '/1.0/containers/{0}'.format(self.name), body_json=body_json)
self.actions.append('apply_container_configs')
def run(self):
"""Run the main method."""
try:
if self.trust_password is not None:
self.client.authenticate(self.trust_password)
self.old_container_json = self._get_container_json()
self.old_state = self._container_json_to_module_state(self.old_container_json)
action = getattr(self, LXD_ANSIBLE_STATES[self.state])
action()
state_changed = len(self.actions) > 0
result_json = {
'log_verbosity': self.module._verbosity,
'changed': state_changed,
'old_state': self.old_state,
'actions': self.actions
}
if self.client.debug:
result_json['logs'] = self.client.logs
if self.addresses is not None:
result_json['addresses'] = self.addresses
self.module.exit_json(**result_json)
except LXDClientException as e:
state_changed = len(self.actions) > 0
fail_params = {
'msg': e.msg,
'changed': state_changed,
'actions': self.actions
}
if self.client.debug:
fail_params['logs'] = e.kwargs['logs']
self.module.fail_json(**fail_params)
def main():
"""Ansible Main module."""
module = AnsibleModule(
argument_spec=dict(
name=dict(
type='str',
required=True
),
architecture=dict(
type='str',
),
config=dict(
type='dict',
),
description=dict(
type='str',
),
devices=dict(
type='dict',
),
ephemeral=dict(
type='bool',
),
profiles=dict(
type='list',
),
source=dict(
type='dict',
),
state=dict(
choices=LXD_ANSIBLE_STATES.keys(),
default='started'
),
timeout=dict(
type='int',
default=30
),
wait_for_ipv4_addresses=dict(
type='bool',
default=False
),
force_stop=dict(
type='bool',
default=False
),
url=dict(
type='str',
default='unix:/var/lib/lxd/unix.socket'
),
key_file=dict(
type='str',
default='{}/.config/lxc/client.key'.format(os.environ['HOME'])
),
cert_file=dict(
type='str',
default='{}/.config/lxc/client.crt'.format(os.environ['HOME'])
),
trust_password=dict(
type='str',
)
),
supports_check_mode=False,
)
lxd_manage = LXDContainerManagement(module=module)
lxd_manage.run()
# import module bits
from ansible.module_utils.basic import *
if __name__ == '__main__':
main()
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