add docker module

library/cloud/docker

+#!/usr/bin/env python
+#
+# The MIT License (MIT)
+#
+# Copyright (c) 2013 Cove Schneider
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+DOCUMENTATION = '''
+---
+module: docker
+short_description: manage docker containers
+description:
+     - Manage the life cycle of docker containers. This module has a dependency on the docker-py python module.
+options:
+  count:
+    description:
+      - Set number of containers to run
+    required: False
+    default: 1
+    aliases: []
+  image:
+    description:
+       - Set container image to use
+    required: true
+    default: null
+    aliases: []
+  command:
+    description:
+       - Set command to run in a container on startup
+    required: false
+    default: null
+    aliases: []
+  ports:
+    description:
+      - Set private to public port mapping specification (e.g. ports=22,80 or ports=:8080 maps 8080 directly to host)
+    required: false
+    default: null
+    aliases: []
+  volumes:
+    description:
+      - Set volume(s) to mount on the container
+    required: false
+    default: null
+    aliases: []
+  volumes_from:
+    description:
+      - Set shared volume(s) from another container
+    required: false
+    default: null
+    aliases: []
+  memory_limit:
+    description:
+      - Set RAM allocated to container
+    required: false
+    default: null
+    aliases: []
+    default: 256MB
+  docker_url:
+    description:
+      - URL of docker host to issue commands to
+    required: false
+    default: unix://var/run/docker.sock
+    aliases: []
+  username:
+    description:
+      - Set remote API username
+    required: false
+    default: null
+    aliases: []
+  password:
+    description:
+      - Set remote API password
+    required: false
+    default: null
+    aliases: []
+  hostname:
+    description:
+      - Set container hostname
+    required: false
+    default: null
+    aliases: []
+  env:
+    description:
+      - Set environment variables
+    required: false
+    default: null
+    aliases: []
+  dns:
+    description:
+      - Set custom DNS servers for the container
+    required: false
+    default: null
+    aliases: []
+  detach:
+    description:
+      - Enable detached mode on start up, leaves container running in background
+    required: false
+    default: true
+    aliases: []
+  state:
+    description:
+      - Set the state of the container
+    required: false
+    default: present
+    choices: [ "present", "stopped", "absent", "killed", "restarted" ]
+    aliases: []
+  privileged:
+    description:
+      - Set whether the container should run in privileged mode
+    required: false
+    default: false
+    aliases: []
+  lxc_conf:
+    description:
+      - LXC config parameters,  e.g. lxc.aa_profile:unconfined
+    required: false
+    default:
+    aliases: []
+author: Cove Schneider
+'''
+
+try:
+    import sys
+    import json
+    import docker.client
+    from requests.exceptions import *
+    from urlparse import urlparse
+except ImportError, e:
+    print "failed=True msg='failed to import python module: %s'" % e
+    sys.exit(1)
+
+def _human_to_bytes(number):
+    suffixes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB']
+
+    if isinstance(number, int):
+        return number
+    if number[-1] == suffixes[0] and number[-2].isdigit():
+        return number[:-1]
+
+    i = 1
+    for each in suffixes[1:]:
+        if number[-len(each):] == suffixes[i]:
+            return int(number[:-len(each)]) * (1024 ** i)
+        i = i + 1
+
+    print "failed=True msg='Could not convert %s to integer'" % (number)
+    sys.exit(1)
+
+def _ansible_facts(container_list):
+    return {"DockerContainers": container_list}
+
+class AnsibleDocker:
+    
+    counters = {'created':0, 'started':0, 'stopped':0, 'killed':0, 'removed':0, 'restarted':0, 'pull':0}
+
+    def __init__(self, module):
+        self.module = module
+    
+        # connect to docker server
+        docker_url = urlparse(module.params.get('docker_url'))
+        self.client = docker.Client(base_url=docker_url.geturl())
+    
+    def get_summary_counters_msg(self):
+        msg = ""
+        for k, v in self.counters.iteritems():
+            msg = msg + "%s %d " % (k, v)
+
+        return msg
+    
+    def increment_counter(self, name):
+        self.counters[name] = self.counters[name] + 1
+
+    def has_changed(self):
+        for k, v in self.counters.iteritems():
+            if v > 0:
+                return True
+
+        return False
+
+    def get_deployed_containers(self):
+        # determine which images/commands are running already
+        containers = self.client.containers()
+        image      = self.module.params.get('image')
+        command    = self.module.params.get('command')
+        deployed   = []
+
+        for i in containers:
+            if i["Image"].split(":")[0] == image.split(":")[0] and (not command or i["Command"].strip() == command.strip()):
+                details = self.client.inspect_container(i['Id'])
+                # XXX: some quirk in docker
+                if 'ID' in details:
+                    details['Id'] = details['ID']
+                    del details['ID']
+                deployed.append(details)
+
+        return deployed
+
+    def get_running_containers(self):
+        running = []
+        for i in self.get_deployed_containers():
+            if i['State']['Running'] == True:
+                running.append(i)
+
+        return running
+
+    def create_containers(self, count=1):
+        params = {'image':        self.module.params.get('image'),
+                  'command':      self.module.params.get('command'),
+                  'volumes_from': self.module.params.get('volumes_from'),
+                  'mem_limit':    _human_to_bytes(self.module.params.get('memory_limit')),
+                  'environment':  self.module.params.get('env'),
+                  'dns':          self.module.params.get('dns'),
+                  'hostname':     self.module.params.get('hostname'),
+                  'detach':       self.module.params.get('detach'),
+                  'privileged':   self.module.params.get('privileged'),
+                  }
+
+        if self.module.params.get('ports'):
+            params['ports'] = self.module.params.get('ports').split(",")
+           
+        def do_create(count, params):
+            results = []
+            for i in range(count):
+                result = self.client.create_container(**params)
+                self.increment_counter('created')
+                results.append(result)
+
+            return results
+
+        try:
+            containers = do_create(count, params)
+        except:
+            self.client.pull(params['image'])
+            self.increment_counter('pull')
+            containers = do_create(count, params)
+
+        return containers
+
+    def start_containers(self, containers):
+        binds = None
+        if self.module.params.get('volumes'):
+            binds = {}
+            vols = self.module.params.get('volumes').split(" ")
+            for vol in vols:
+                parts = vol.split(":")
+                binds[parts[0]] = parts[1]
+
+        lxc_conf = None
+        if self.module.params.get('lxc_conf'):
+            lxc_conf = []
+            options = self.module.params.get('lxc_conf').split(" ")
+            for option in options:
+                parts = option.split(':')
+                lxc_conf.append({"Key": parts[0], "Value": parts[1]})
+
+        for i in containers:
+                self.client.start(i['Id'], lxc_conf=lxc_conf, binds=binds)
+                self.increment_counter('started')
+
+    def stop_containers(self, containers):
+        for i in containers:
+            self.client.stop(i['Id'])
+            self.increment_counter('stopped')
+
+        return [self.client.wait(i['Id']) for i in containers]
+
+    def remove_containers(self, containers):
+        for i in containers:
+            self.client.remove_container(i['Id'])
+            self.increment_counter('removed')
+    
+    def kill_containers(self, containers):
+        for i in containers:
+            self.client.kill(i['Id'])
+            self.increment_counter('killed')
+
+    def restart_containers(self, containers):
+        for i in containers:
+            self.client.restart(i['Id'])
+            self.increment_counter('restarted')
+
+def main():
+    module = AnsibleModule(
+        argument_spec = dict(
+            count           = dict(default=1),
+            image           = dict(required=True),
+            command         = dict(required=False, default=None),
+            ports           = dict(required=False, default=None),
+            volumes         = dict(default=None),
+            volumes_from    = dict(default=None),
+            memory_limit    = dict(default=0),
+            memory_swap     = dict(default=0),
+            docker_url      = dict(default='unix://var/run/docker.sock'),
+            user            = dict(default=None),
+            password        = dict(),
+            email           = dict(),
+            hostname        = dict(default=None),
+            env             = dict(),
+            dns             = dict(),
+            detach          = dict(default=True, type='bool'),
+            state           = dict(default='present', choices=['absent', 'present', 'stopped', 'killed', 'restarted']),
+            debug           = dict(default=False, type='bool'),
+            privileged      = dict(default=False, type='bool'),
+            lxc_conf        = dict(default=None)
+        )
+    )
+
+    try:
+        docker_client = AnsibleDocker(module)
+        state = module.params.get('state')
+        count = int(module.params.get('count'))
+
+        if count < 1:
+            module.fail_json(msg="Count must be positive number")
+    
+        running_containers = docker_client.get_running_containers()
+        running_count = len(running_containers)
+        delta = count - running_count
+        deployed_containers = docker_client.get_deployed_containers()
+        facts = None
+        failed = False
+        changed = False
+
+        # start/stop containers
+        if state == "present":
+    
+            # start more containers if we don't have enough
+            if delta > 0:
+                containers = docker_client.create_containers(delta)
+                docker_client.start_containers(containers)
+                
+            # stop containers if we have too many
+            elif delta < 0:
+                docker_client.stop_containers(running_containers[0:abs(delta)])
+                docker_client.remove_containers(running_containers[0:abs(delta)])
+            
+            facts = docker_client.get_running_containers()
+    
+        # stop and remove containers
+        elif state == "absent":
+            facts = docker_client.stop_containers(deployed_containers)
+            docker_client.remove_containers(containers)
+    
+        # stop containers
+        elif state == "stopped":
+            facts = docker_client.stop_containers(running_containers)
+    
+        # kill containers
+        elif state == "killed":
+            docker_client.kill_containers(running_containers)
+    
+        # restart containers
+        elif state == "restarted":
+            docker_client.restart_containers(running_containers)        
+    
+        msg = "%s container(s) running image %s with command %s" % \
+                (docker_client.get_summary_counters_msg(), module.params.get('image'), module.params.get('command'))
+        changed = docker_client.has_changed()
+    
+        module.exit_json(failed=failed, changed=changed, msg=msg, ansible_facts=_ansible_facts(facts))
+
+    except docker.client.APIError as e:
+        changed = docker_client.has_changed()
+        module.exit_json(failed=True, changed=changed, msg="Docker API error: " + e.explanation)
+
+    except RequestException as e:
+        changed = docker_client.has_changed()
+        module.exit_json(failed=True, changed=changed, msg=repr(e))
+        
+# this is magic, see lib/ansible/module_common.py
+#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
+
+main()