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#!/usr/bin/env python | ||
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# (c) 2013, Paul Durivage <[email protected]> | ||
# | ||
# 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/>. | ||
# | ||
# | ||
# Author: Paul Durivage <[email protected]> | ||
# | ||
# Description: | ||
# This module queries local or remote Docker daemons and generates | ||
# inventory information. | ||
# | ||
# This plugin does not support targeting of specific hosts using the --host | ||
# flag. Instead, it it queries the Docker API for each container, running | ||
# or not, and returns this data all once. | ||
# | ||
# The plugin returns the following custom attributes on Docker containers: | ||
# docker_args | ||
# docker_config | ||
# docker_created | ||
# docker_driver | ||
# docker_exec_driver | ||
# docker_host_config | ||
# docker_hostname_path | ||
# docker_hosts_path | ||
# docker_id | ||
# docker_image | ||
# docker_name | ||
# docker_network_settings | ||
# docker_path | ||
# docker_resolv_conf_path | ||
# docker_state | ||
# docker_volumes | ||
# docker_volumes_rw | ||
# | ||
# Requirements: | ||
# The docker-py module: https://github.com/dotcloud/docker-py | ||
# | ||
# Notes: | ||
# A config file can be used to configure this inventory module, and there | ||
# are several environment variables that can be set to modify the behavior | ||
# of the plugin at runtime: | ||
# DOCKER_CONFIG_FILE | ||
# DOCKER_HOST | ||
# DOCKER_VERSION | ||
# DOCKER_TIMEOUT | ||
# DOCKER_PRIVATE_SSH_PORT | ||
# DOCKER_DEFAULT_IP | ||
# | ||
# Environment Variables: | ||
# environment variable: DOCKER_CONFIG_FILE | ||
# description: | ||
# - A path to a Docker inventory hosts/defaults file in YAML format | ||
# - A sample file has been provided, colocated with the inventory | ||
# file called 'docker.yml' | ||
# required: false | ||
# default: Uses docker.docker.Client constructor defaults | ||
# environment variable: DOCKER_HOST | ||
# description: | ||
# - The socket on which to connect to a Docker daemon API | ||
# required: false | ||
# default: Uses docker.docker.Client constructor defaults | ||
# environment variable: DOCKER_VERSION | ||
# description: | ||
# - Version of the Docker API to use | ||
# default: Uses docker.docker.Client constructor defaults | ||
# required: false | ||
# environment variable: DOCKER_TIMEOUT | ||
# description: | ||
# - Timeout in seconds for connections to Docker daemon API | ||
# default: Uses docker.docker.Client constructor defaults | ||
# required: false | ||
# environment variable: DOCKER_PRIVATE_SSH_PORT | ||
# description: | ||
# - The private port (container port) on which SSH is listening | ||
# for connections | ||
# default: 22 | ||
# required: false | ||
# environment variable: DOCKER_DEFAULT_IP | ||
# description: | ||
# - This environment variable overrides the container SSH connection | ||
# IP address (aka, 'ansible_ssh_host') | ||
# | ||
# This option allows one to override the ansible_ssh_host whenever | ||
# Docker has exercised its default behavior of binding private ports | ||
# to all interfaces of the Docker host. This behavior, when dealing | ||
# with remote Docker hosts, does not allow Ansible to determine | ||
# a proper host IP address on which to connect via SSH to containers. | ||
# By default, this inventory module assumes all 0.0.0.0-exposed | ||
# ports to be bound to localhost:<port>. To override this | ||
# behavior, for example, to bind a container's SSH port to the public | ||
# interface of its host, one must manually set this IP. | ||
# | ||
# It is preferable to begin to launch Docker containers with | ||
# ports exposed on publicly accessible IP addresses, particularly | ||
# if the containers are to be targeted by Ansible for remote | ||
# configuration, not accessible via localhost SSH connections. | ||
# | ||
# Docker containers can be explicitly exposed on IP addresses by | ||
# a) starting the daemon with the --ip argument | ||
# b) running containers with the -P/--publish ip::containerPort | ||
# argument | ||
# default: 127.0.0.1 if port exposed on 0.0.0.0 by Docker | ||
# required: false | ||
# | ||
# Examples: | ||
# Use the config file: | ||
# DOCKER_CONFIG_FILE=./docker.yml docker.py --list | ||
# | ||
# Connect to docker instance on localhost port 4243 | ||
# DOCKER_HOST=tcp://localhost:4243 docker.py --list | ||
# | ||
# Any container's ssh port exposed on 0.0.0.0 will mapped to | ||
# another IP address (where Ansible will attempt to connect via SSH) | ||
# DOCKER_DEFAULT_IP=1.2.3.4 docker.py --list | ||
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import os | ||
import sys | ||
import json | ||
import argparse | ||
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from UserDict import UserDict | ||
from collections import defaultdict | ||
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import yaml | ||
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from requests import HTTPError, ConnectionError | ||
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# Manipulation of the path is needed because the docker-py | ||
# module is imported by the name docker, and because this file | ||
# is also named docker | ||
for path in [os.getcwd(), '', os.path.dirname(os.path.abspath(__file__))]: | ||
try: | ||
del sys.path[sys.path.index(path)] | ||
except: | ||
pass | ||
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try: | ||
import docker | ||
except ImportError: | ||
print('docker-py is required for this module') | ||
sys.exit(1) | ||
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class HostDict(UserDict): | ||
def __setitem__(self, key, value): | ||
if value is not None: | ||
self.data[key] = value | ||
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def update(self, dict=None, **kwargs): | ||
if dict is None: | ||
pass | ||
elif isinstance(dict, UserDict): | ||
for k, v in dict.data.items(): | ||
self[k] = v | ||
else: | ||
for k, v in dict.items(): | ||
self[k] = v | ||
if len(kwargs): | ||
for k, v in kwargs.items(): | ||
self[k] = v | ||
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def write_stderr(string): | ||
sys.stderr.write('%s\n' % string) | ||
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def setup(): | ||
config = dict() | ||
config_file = os.environ.get('DOCKER_CONFIG_FILE') | ||
if config_file: | ||
try: | ||
config_file = os.path.abspath(config_file) | ||
except Exception as e: | ||
write_stderr(e) | ||
sys.exit(1) | ||
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with open(config_file) as f: | ||
try: | ||
config = yaml.safe_load(f.read()) | ||
except Exception as e: | ||
write_stderr(e) | ||
sys.exit(1) | ||
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# Enviroment Variables | ||
env_base_url = os.environ.get('DOCKER_HOST') | ||
env_version = os.environ.get('DOCKER_VERSION') | ||
env_timeout = os.environ.get('DOCKER_TIMEOUT') | ||
env_ssh_port = os.environ.get('DOCKER_PRIVATE_SSH_PORT', '22') | ||
env_default_ip = os.environ.get('DOCKER_DEFAULT_IP', '127.0.0.1') | ||
# Config file defaults | ||
defaults = config.get('defaults', dict()) | ||
def_host = defaults.get('host') | ||
def_version = defaults.get('version') | ||
def_timeout = defaults.get('timeout') | ||
def_default_ip = defaults.get('default_ip') | ||
def_ssh_port = defaults.get('private_ssh_port') | ||
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hosts = list() | ||
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if config: | ||
hosts_list = config.get('hosts', list()) | ||
# Look to the config file's defined hosts | ||
if hosts_list: | ||
for host in hosts_list: | ||
baseurl = host.get('host') or def_host or env_base_url | ||
version = host.get('version') or def_version or env_version | ||
timeout = host.get('timeout') or def_timeout or env_timeout | ||
default_ip = host.get('default_ip') or def_default_ip or env_default_ip | ||
ssh_port = host.get('private_ssh_port') or def_ssh_port or env_ssh_port | ||
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hostdict = HostDict( | ||
base_url=baseurl, | ||
version=version, | ||
timeout=timeout, | ||
default_ip=default_ip, | ||
private_ssh_port=ssh_port, | ||
) | ||
hosts.append(hostdict) | ||
# Look to the defaults | ||
else: | ||
hostdict = HostDict( | ||
base_url=def_host, | ||
version=def_version, | ||
timeout=def_timeout, | ||
default_ip=def_default_ip, | ||
private_ssh_port=def_ssh_port, | ||
) | ||
hosts.append(hostdict) | ||
# Look to the environment | ||
else: | ||
hostdict = HostDict( | ||
base_url=env_base_url, | ||
version=env_version, | ||
timeout=env_timeout, | ||
default_ip=env_default_ip, | ||
private_ssh_port=env_ssh_port, | ||
) | ||
hosts.append(hostdict) | ||
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return hosts | ||
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def list_groups(): | ||
hosts = setup() | ||
groups = defaultdict(list) | ||
hostvars = defaultdict(dict) | ||
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for host in hosts: | ||
ssh_port = host.pop('private_ssh_port', None) | ||
default_ip = host.pop('default_ip', None) | ||
hostname = host.get('base_url') | ||
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try: | ||
client = docker.Client(**host) | ||
containers = client.containers(all=True) | ||
except (HTTPError, ConnectionError) as e: | ||
write_stderr(e) | ||
sys.exit(1) | ||
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for container in containers: | ||
id = container.get('Id') | ||
short_id = id[:13] | ||
try: | ||
name = container.get('Names', list()).pop(0).lstrip('/') | ||
except IndexError: | ||
name = short_id | ||
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if not id: | ||
continue | ||
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inspect = client.inspect_container(id) | ||
running = inspect.get('State', dict()).get('Running') | ||
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groups[id].append(name) | ||
groups[name].append(name) | ||
if not short_id in groups.keys(): | ||
groups[short_id].append(name) | ||
groups[hostname].append(name) | ||
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if running is True: | ||
groups['running'].append(name) | ||
else: | ||
groups['stopped'].append(name) | ||
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try: | ||
port = client.port(container, ssh_port)[0] | ||
except (IndexError, AttributeError): | ||
port = dict() | ||
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try: | ||
ip = default_ip if port['HostIp'] == '0.0.0.0' else port['HostIp'] | ||
except KeyError: | ||
ip = '' | ||
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container_info = dict( | ||
ansible_ssh_host=ip, | ||
ansible_ssh_port=port.get('HostPort', int()), | ||
docker_args=inspect.get('Args'), | ||
docker_config=inspect.get('Config'), | ||
docker_created=inspect.get('Created'), | ||
docker_driver=inspect.get('Driver'), | ||
docker_exec_driver=inspect.get('ExecDriver'), | ||
docker_host_config=inspect.get('HostConfig'), | ||
docker_hostname_path=inspect.get('HostnamePath'), | ||
docker_hosts_path=inspect.get('HostsPath'), | ||
docker_id=inspect.get('ID'), | ||
docker_image=inspect.get('Image'), | ||
docker_name=name, | ||
docker_network_settings=inspect.get('NetworkSettings'), | ||
docker_path=inspect.get('Path'), | ||
docker_resolv_conf_path=inspect.get('ResolvConfPath'), | ||
docker_state=inspect.get('State'), | ||
docker_volumes=inspect.get('Volumes'), | ||
docker_volumes_rw=inspect.get('VolumesRW'), | ||
) | ||
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hostvars[name].update(container_info) | ||
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groups['docker_hosts'] = [host.get('base_url') for host in hosts] | ||
groups['_meta'] = dict() | ||
groups['_meta']['hostvars'] = hostvars | ||
print json.dumps(groups, sort_keys=True, indent=4) | ||
sys.exit(0) | ||
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def parse_args(): | ||
parser = argparse.ArgumentParser() | ||
group = parser.add_mutually_exclusive_group(required=True) | ||
group.add_argument('--list', action='store_true') | ||
group.add_argument('--host', action='store_true') | ||
return parser.parse_args() | ||
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def main(): | ||
args = parse_args() | ||
if args.list: | ||
list_groups() | ||
elif args.host: | ||
write_stderr('This option is not supported.') | ||
sys.exit(1) | ||
sys.exit(0) | ||
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main() |
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