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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
config:
description:
- A config dictionary for creating a container.
See https://github.com/lxc/lxd/blob/master/doc/rest-api.md#post-1
- Required when the container is not created yet and the state is
not absent.
required: false
state:
choices:
- started
- stopped
- restarted
- absent
- frozen
description:
- Define the state of a container.
required: false
default: started
timeout:
description:
- A timeout of one LXC REST API call.
- 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 lxd_module 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 lxd_module forces to stop the container
when it stops or restarts the container.
required: false
default: false
unix_socket_path:
description:
- The unix domain socket path for the LXD server.
required: false
default: /var/lib/lxd/unix.socket
requirements:
- 'requests_unixsocket'
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 `copy` and `template` 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 = """
- hosts: localhost
connection: local
tasks:
- name: Create a started container
lxd_container:
name: mycontainer
state: started
config:
source:
type: image
mode: pull
server: https://images.linuxcontainers.org
protocol: lxd
alias: "ubuntu/xenial/amd64"
profiles: ["default"]
- name: Install python in the created container "mycontainer"
command: lxc exec mycontainer -- apt install -y python
- name: Copy /etc/hosts in the created container "mycontainer" to localhost with name "mycontainer-hosts"
command: lxc file pull mycontainer/etc/hosts mycontainer-hosts
# Note your container must be in the inventory for the below example.
#
# [containers]
# mycontainer ansible_connection=lxd
#
- hosts:
- mycontainer
tasks:
- template: src=foo.j2 dest=/etc/bar
- hosts: localhost
connection: local
tasks:
- name: Create a stopped container
lxd_container:
name: mycontainer
state: stopped
config:
source:
type: image
mode: pull
server: https://images.linuxcontainers.org
protocol: lxd
alias: "ubuntu/xenial/amd64"
profiles: ["default"]
- hosts: localhost
connection: local
tasks:
- name: Restart a container
lxd_container:
name: mycontainer
state: restarted
config:
source:
type: image
mode: pull
server: https://images.linuxcontainers.org
protocol: lxd
alias: "ubuntu/xenial/amd64"
profiles: ["default"]
"""
RETURN="""
lxd_container:
description: container information
returned: success
type: object
contains:
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
sample: "stopped"
actions:
description: list of actions performed for the container
returned: success
type: list
sample: ["create", "start"]
"""
from ansible.compat.six.moves.urllib.parse import quote
try:
import requests_unixsocket
from requests.exceptions import ConnectionError
except ImportError:
HAS_REQUETS_UNIXSOCKET = False
else:
HAS_REQUETS_UNIXSOCKET = True
# 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',
}
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.container_name = self.module.params['name']
self.config = self.module.params.get('config', None)
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.unix_socket_path = self.module.params['unix_socket_path']
self.base_url = 'http+unix://{0}'.format(quote(self.unix_socket_path, safe=''))
self.session = requests_unixsocket.Session()
self.actions = []
def _send_request(self, method, path, json=None, ok_error_codes=None):
try:
url = self.base_url + path
resp = self.session.request(method, url, json=json, timeout=self.timeout)
resp_json = resp.json()
resp_type = resp_json.get('type', None)
if resp_type == 'error':
if ok_error_codes is not None and resp_json['error_code'] in ok_error_codes:
return resp_json
self.module.fail_json(
msg='error response',
request={'method': method, 'url': url, 'json': json, 'timeout': self.timeout},
response={'json': resp_json}
)
return resp_json
except ConnectionError:
self.module.fail_json(msg='cannot connect to the LXD server', unix_socket_path=self.unix_socket_path)
def _operate_and_wait(self, method, path, json=None):
resp_json = self._send_request(method, path, json=json)
if resp_json['type'] == 'async':
path = '{0}/wait?timeout={1}'.format(resp_json['operation'], self.timeout)
resp_json = self._send_request('GET', path)
return resp_json
def _get_container_state_json(self):
return self._send_request(
'GET', '/1.0/containers/{0}/state'.format(self.container_name),
ok_error_codes=[404]
)
@staticmethod
def _container_state_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):
json={'action': action, 'timeout': self.timeout}
if force_stop:
json['force'] = True
return self._operate_and_wait('PUT', '/1.0/containers/{0}/state'.format(self.container_name), json)
def _create_container(self):
config = self.config.copy()
config['name'] = self.container_name
self._operate_and_wait('POST', '/1.0/containers', config)
self.actions.append('creat')
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._operate_and_wait('DELETE', '/1.0/containers/{0}'.format(self.container_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.iteritems() 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.iteritems()) 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):
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
state_changed = len(self.actions) > 0
self.module.fail_json(
failed=True,
msg='timeout for getting IPv4 addresses',
changed=state_changed,
logs=self.actions)
def _started(self):
if self.old_state == 'absent':
self._create_container()
self._start_container()
else:
if self.old_state == 'frozen':
self._unfreeze_container()
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 == 'frozen':
self._unfreeze_container()
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()
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()
self._freeze_container()
def run(self):
"""Run the main method."""
self.old_state = self._container_state_json_to_module_state(self._get_container_state_json())
action = getattr(self, LXD_ANSIBLE_STATES[self.state])
action()
state_changed = len(self.actions) > 0
result_json = {
'changed': state_changed,
'old_state': self.old_state,
'actions': self.actions
}
if self.addresses is not None:
result_json['addresses'] = self.addresses
self.module.exit_json(**result_json)
def main():
"""Ansible Main module."""
module = AnsibleModule(
argument_spec=dict(
name=dict(
type='str',
required=True
),
config=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=True
),
force_stop=dict(
type='bool',
default=False
),
unix_socket_path=dict(
type='str',
default='/var/lib/lxd/unix.socket'
)
),
supports_check_mode=False,
)
if not HAS_REQUETS_UNIXSOCKET:
module.fail_json(
msg='The `requests_unixsocket` module is not importable. Check the requirements.'
)
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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