359 lines
12 KiB
Python
Executable file
359 lines
12 KiB
Python
Executable file
#!/usr/bin/env python
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# (c) 2013, Paul Durivage <paul.durivage@gmail.com>
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#
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# This file is part of Ansible.
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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# Author: Paul Durivage <paul.durivage@gmail.com>
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#
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# Description:
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# This module queries local or remote Docker daemons and generates
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# inventory information.
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#
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# This plugin does not support targeting of specific hosts using the --host
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# flag. Instead, it queries the Docker API for each container, running
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# or not, and returns this data all once.
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#
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# The plugin returns the following custom attributes on Docker containers:
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# docker_args
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# docker_config
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# docker_created
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# docker_driver
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# docker_exec_driver
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# docker_host_config
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# docker_hostname_path
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# docker_hosts_path
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# docker_id
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# docker_image
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# docker_name
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# docker_network_settings
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# docker_path
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# docker_resolv_conf_path
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# docker_state
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# docker_volumes
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# docker_volumes_rw
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#
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# Requirements:
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# The docker-py module: https://github.com/dotcloud/docker-py
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#
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# Notes:
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# A config file can be used to configure this inventory module, and there
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# are several environment variables that can be set to modify the behavior
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# of the plugin at runtime:
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# DOCKER_CONFIG_FILE
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# DOCKER_HOST
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# DOCKER_VERSION
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# DOCKER_TIMEOUT
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# DOCKER_PRIVATE_SSH_PORT
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# DOCKER_DEFAULT_IP
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#
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# Environment Variables:
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# environment variable: DOCKER_CONFIG_FILE
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# description:
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# - A path to a Docker inventory hosts/defaults file in YAML format
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# - A sample file has been provided, colocated with the inventory
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# file called 'docker.yml'
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# required: false
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# default: Uses docker.docker.Client constructor defaults
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# environment variable: DOCKER_HOST
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# description:
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# - The socket on which to connect to a Docker daemon API
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# required: false
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# default: Uses docker.docker.Client constructor defaults
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# environment variable: DOCKER_VERSION
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# description:
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# - Version of the Docker API to use
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# default: Uses docker.docker.Client constructor defaults
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# required: false
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# environment variable: DOCKER_TIMEOUT
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# description:
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# - Timeout in seconds for connections to Docker daemon API
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# default: Uses docker.docker.Client constructor defaults
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# required: false
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# environment variable: DOCKER_PRIVATE_SSH_PORT
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# description:
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# - The private port (container port) on which SSH is listening
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# for connections
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# default: 22
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# required: false
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# environment variable: DOCKER_DEFAULT_IP
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# description:
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# - This environment variable overrides the container SSH connection
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# IP address (aka, 'ansible_ssh_host')
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#
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# This option allows one to override the ansible_ssh_host whenever
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# Docker has exercised its default behavior of binding private ports
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# to all interfaces of the Docker host. This behavior, when dealing
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# with remote Docker hosts, does not allow Ansible to determine
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# a proper host IP address on which to connect via SSH to containers.
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# By default, this inventory module assumes all 0.0.0.0-exposed
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# ports to be bound to localhost:<port>. To override this
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# behavior, for example, to bind a container's SSH port to the public
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# interface of its host, one must manually set this IP.
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#
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# It is preferable to begin to launch Docker containers with
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# ports exposed on publicly accessible IP addresses, particularly
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# if the containers are to be targeted by Ansible for remote
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# configuration, not accessible via localhost SSH connections.
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#
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# Docker containers can be explicitly exposed on IP addresses by
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# a) starting the daemon with the --ip argument
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# b) running containers with the -P/--publish ip::containerPort
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# argument
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# default: 127.0.0.1 if port exposed on 0.0.0.0 by Docker
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# required: false
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#
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# Examples:
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# Use the config file:
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# DOCKER_CONFIG_FILE=./docker.yml docker.py --list
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#
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# Connect to docker instance on localhost port 4243
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# DOCKER_HOST=tcp://localhost:4243 docker.py --list
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#
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# Any container's ssh port exposed on 0.0.0.0 will mapped to
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# another IP address (where Ansible will attempt to connect via SSH)
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# DOCKER_DEFAULT_IP=1.2.3.4 docker.py --list
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import os
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import sys
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import json
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import argparse
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from UserDict import UserDict
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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
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# module is imported by the name docker, and because this file
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# is also named docker
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for path in [os.getcwd(), '', os.path.dirname(os.path.abspath(__file__))]:
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try:
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del sys.path[sys.path.index(path)]
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except:
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pass
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try:
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import docker
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except ImportError:
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print('docker-py is required for this module')
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sys.exit(1)
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class HostDict(UserDict):
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def __setitem__(self, key, value):
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if value is not None:
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self.data[key] = value
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def update(self, dict=None, **kwargs):
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if dict is None:
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pass
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elif isinstance(dict, UserDict):
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for k, v in dict.data.items():
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self[k] = v
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else:
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for k, v in dict.items():
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self[k] = v
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if len(kwargs):
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for k, v in kwargs.items():
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self[k] = v
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def write_stderr(string):
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sys.stderr.write('%s\n' % string)
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def setup():
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config = dict()
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config_file = os.environ.get('DOCKER_CONFIG_FILE')
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if config_file:
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try:
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config_file = os.path.abspath(config_file)
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except Exception as e:
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write_stderr(e)
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sys.exit(1)
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with open(config_file) as f:
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try:
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config = yaml.safe_load(f.read())
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except Exception as e:
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write_stderr(e)
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sys.exit(1)
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# Environment Variables
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env_base_url = os.environ.get('DOCKER_HOST')
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env_version = os.environ.get('DOCKER_VERSION')
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env_timeout = os.environ.get('DOCKER_TIMEOUT')
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env_ssh_port = os.environ.get('DOCKER_PRIVATE_SSH_PORT', '22')
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env_default_ip = os.environ.get('DOCKER_DEFAULT_IP', '127.0.0.1')
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# Config file defaults
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defaults = config.get('defaults', dict())
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def_host = defaults.get('host')
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def_version = defaults.get('version')
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def_timeout = defaults.get('timeout')
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def_default_ip = defaults.get('default_ip')
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def_ssh_port = defaults.get('private_ssh_port')
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hosts = list()
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if config:
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hosts_list = config.get('hosts', list())
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# Look to the config file's defined hosts
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if hosts_list:
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for host in hosts_list:
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baseurl = host.get('host') or def_host or env_base_url
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version = host.get('version') or def_version or env_version
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timeout = host.get('timeout') or def_timeout or env_timeout
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default_ip = host.get('default_ip') or def_default_ip or env_default_ip
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ssh_port = host.get('private_ssh_port') or def_ssh_port or env_ssh_port
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hostdict = HostDict(
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base_url=baseurl,
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version=version,
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timeout=timeout,
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default_ip=default_ip,
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private_ssh_port=ssh_port,
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)
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hosts.append(hostdict)
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# Look to the defaults
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else:
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hostdict = HostDict(
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base_url=def_host,
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version=def_version,
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timeout=def_timeout,
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default_ip=def_default_ip,
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private_ssh_port=def_ssh_port,
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)
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hosts.append(hostdict)
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# Look to the environment
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else:
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hostdict = HostDict(
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base_url=env_base_url,
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version=env_version,
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timeout=env_timeout,
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default_ip=env_default_ip,
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private_ssh_port=env_ssh_port,
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)
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hosts.append(hostdict)
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return hosts
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def list_groups():
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hosts = setup()
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groups = defaultdict(list)
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hostvars = defaultdict(dict)
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for host in hosts:
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ssh_port = host.pop('private_ssh_port', None)
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default_ip = host.pop('default_ip', None)
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hostname = host.get('base_url')
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try:
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client = docker.Client(**host)
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containers = client.containers(all=True)
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except (HTTPError, ConnectionError) as e:
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write_stderr(e)
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sys.exit(1)
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for container in containers:
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id = container.get('Id')
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short_id = id[:13]
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try:
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name = container.get('Names', list()).pop(0).lstrip('/')
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except IndexError:
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name = short_id
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if not id:
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continue
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inspect = client.inspect_container(id)
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running = inspect.get('State', dict()).get('Running')
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groups[id].append(name)
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groups[name].append(name)
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if not short_id in groups.keys():
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groups[short_id].append(name)
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groups[hostname].append(name)
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if running is True:
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groups['running'].append(name)
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else:
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groups['stopped'].append(name)
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try:
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port = client.port(container, ssh_port)[0]
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except (IndexError, AttributeError):
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port = dict()
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try:
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ip = default_ip if port['HostIp'] == '0.0.0.0' else port['HostIp']
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except KeyError:
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ip = ''
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container_info = dict(
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ansible_ssh_host=ip,
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ansible_ssh_port=port.get('HostPort', int()),
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docker_args=inspect.get('Args'),
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docker_config=inspect.get('Config'),
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docker_created=inspect.get('Created'),
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docker_driver=inspect.get('Driver'),
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docker_exec_driver=inspect.get('ExecDriver'),
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docker_host_config=inspect.get('HostConfig'),
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docker_hostname_path=inspect.get('HostnamePath'),
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docker_hosts_path=inspect.get('HostsPath'),
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docker_id=inspect.get('ID'),
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docker_image=inspect.get('Image'),
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docker_name=name,
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docker_network_settings=inspect.get('NetworkSettings'),
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docker_path=inspect.get('Path'),
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docker_resolv_conf_path=inspect.get('ResolvConfPath'),
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docker_state=inspect.get('State'),
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docker_volumes=inspect.get('Volumes'),
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docker_volumes_rw=inspect.get('VolumesRW'),
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)
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hostvars[name].update(container_info)
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groups['docker_hosts'] = [host.get('base_url') for host in hosts]
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groups['_meta'] = dict()
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groups['_meta']['hostvars'] = hostvars
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print json.dumps(groups, sort_keys=True, indent=4)
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sys.exit(0)
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def parse_args():
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parser = argparse.ArgumentParser()
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group = parser.add_mutually_exclusive_group(required=True)
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group.add_argument('--list', action='store_true')
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group.add_argument('--host', action='store_true')
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return parser.parse_args()
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def main():
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args = parse_args()
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if args.list:
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list_groups()
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elif args.host:
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write_stderr('This option is not supported.')
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sys.exit(1)
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sys.exit(0)
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main()
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