#!/usr/bin/python # -*- coding: utf-8 -*- """ Virt management features Copyright 2007, 2012 Red Hat, Inc Michael DeHaan Seth Vidal This software may be freely redistributed under the terms of the GNU general public license. You should have received a copy of the GNU General Public License along with this program. If not, see . """ DOCUMENTATION = ''' --- module: virt short_description: Manages virtual machines supported by libvirt description: - Manages virtual machines supported by I(libvirt). version_added: historical options: name: description: - name of the guest VM being managed. Note that VM must be previously defined with xml. required: true default: null aliases: [] state: description: - Note that there may be some lag for state requests like C(shutdown) since these refer only to VM states. After starting a guest, it may not be immediately accessible. required: false choices: [ "running", "shutdown" ] default: "no" command: description: - in addition to state management, various non-idempotent commands are available. See examples required: false choices: ["create","status", "start", "stop", "pause", "unpause", "shutdown", "undefine", "destroy", "get_xml", "autostart", "freemem", "list_vms", "info", "nodeinfo", "virttype", "define"] uri: description: - libvirt connection uri required: false defaults: qemu:///system xml: description: - XML document used with the define command required: false default: null requirements: [ "libvirt" ] author: Michael DeHaan, Seth Vidal ''' EXAMPLES = ''' # a playbook task line: - virt: name=alpha state=running # /usr/bin/ansible invocations ansible host -m virt -a "name=alpha command=status" ansible host -m virt -a "name=alpha command=get_xml" ansible host -m virt -a "name=alpha command=create uri=lxc:///" # a playbook example of defining and launching an LXC guest tasks: - name: define vm virt: name=foo command=define xml="{{ lookup('template', 'container-template.xml.j2') }}" uri=lxc:/// - name: start vm virt: name=foo state=running uri=lxc:/// ''' VIRT_FAILED = 1 VIRT_SUCCESS = 0 VIRT_UNAVAILABLE=2 import sys try: import libvirt except ImportError: print "failed=True msg='libvirt python module unavailable'" sys.exit(1) ALL_COMMANDS = [] VM_COMMANDS = ['create','status', 'start', 'stop', 'pause', 'unpause', 'shutdown', 'undefine', 'destroy', 'get_xml', 'autostart', 'define'] HOST_COMMANDS = ['freemem', 'list_vms', 'info', 'nodeinfo', 'virttype'] ALL_COMMANDS.extend(VM_COMMANDS) ALL_COMMANDS.extend(HOST_COMMANDS) VIRT_STATE_NAME_MAP = { 0 : "running", 1 : "running", 2 : "running", 3 : "paused", 4 : "shutdown", 5 : "shutdown", 6 : "crashed" } class VMNotFound(Exception): pass class LibvirtConnection(object): def __init__(self, uri): cmd = subprocess.Popen("uname -r", shell=True, stdout=subprocess.PIPE, close_fds=True) output = cmd.communicate()[0] if output.find("xen") != -1: conn = libvirt.open(None) else: conn = libvirt.open(uri) if not conn: raise Exception("hypervisor connection failure") self.conn = conn def find_vm(self, vmid): """ Extra bonus feature: vmid = -1 returns a list of everything """ conn = self.conn vms = [] # this block of code borrowed from virt-manager: # get working domain's name ids = conn.listDomainsID() for id in ids: vm = conn.lookupByID(id) vms.append(vm) # get defined domain names = conn.listDefinedDomains() for name in names: vm = conn.lookupByName(name) vms.append(vm) if vmid == -1: return vms for vm in vms: if vm.name() == vmid: return vm raise VMNotFound("virtual machine %s not found" % vmid) def shutdown(self, vmid): return self.find_vm(vmid).shutdown() def pause(self, vmid): return self.suspend(self.conn,vmid) def unpause(self, vmid): return self.resume(self.conn,vmid) def suspend(self, vmid): return self.find_vm(vmid).suspend() def resume(self, vmid): return self.find_vm(vmid).resume() def create(self, vmid): return self.find_vm(vmid).create() def destroy(self, vmid): return self.find_vm(vmid).destroy() def undefine(self, vmid): return self.find_vm(vmid).undefine() def get_status2(self, vm): state = vm.info()[0] return VIRT_STATE_NAME_MAP.get(state,"unknown") def get_status(self, vmid): state = self.find_vm(vmid).info()[0] return VIRT_STATE_NAME_MAP.get(state,"unknown") def nodeinfo(self): return self.conn.getInfo() def get_type(self): return self.conn.getType() def get_maxVcpus(self, vmid): vm = self.conn.lookupByName(vmid) return vm.maxVcpus() def get_maxMemory(self, vmid): vm = self.conn.lookupByName(vmid) return vm.maxMemory() def getFreeMemory(self): return self.conn.getFreeMemory() def get_autostart(self, vmid): vm = self.conn.lookupByName(vmid) return vm.autostart() def set_autostart(self, vmid, val): vm = self.conn.lookupByName(vmid) return vm.setAutostart(val) def define_from_xml(self, xml): return self.conn.defineXML(xml) class Virt(object): def __init__(self, uri): self.uri = uri def __get_conn(self): self.conn = LibvirtConnection(self.uri) return self.conn def get_vm(self, vmid): self.__get_conn() return self.conn.find_vm(vmid) def state(self): vms = self.list_vms() state = [] for vm in vms: state_blurb = self.conn.get_status(vm) state.append("%s %s" % (vm,state_blurb)) return state def info(self): vms = self.list_vms() info = dict() for vm in vms: data = self.conn.find_vm(vm).info() # libvirt returns maxMem, memory, and cpuTime as long()'s, which # xmlrpclib tries to convert to regular int's during serialization. # This throws exceptions, so convert them to strings here and # assume the other end of the xmlrpc connection can figure things # out or doesn't care. info[vm] = { "state" : VIRT_STATE_NAME_MAP.get(data[0],"unknown"), "maxMem" : str(data[1]), "memory" : str(data[2]), "nrVirtCpu" : data[3], "cpuTime" : str(data[4]), } info[vm]["autostart"] = self.conn.get_autostart(vm) return info def nodeinfo(self): self.__get_conn() info = dict() data = self.conn.nodeinfo() info = { "cpumodel" : str(data[0]), "phymemory" : str(data[1]), "cpus" : str(data[2]), "cpumhz" : str(data[3]), "numanodes" : str(data[4]), "sockets" : str(data[5]), "cpucores" : str(data[6]), "cputhreads" : str(data[7]) } return info def list_vms(self, state=None): self.conn = self.__get_conn() vms = self.conn.find_vm(-1) results = [] for x in vms: try: if state: vmstate = self.conn.get_status2(x) if vmstate == state: results.append(x.name()) else: results.append(x.name()) except: pass return results def virttype(self): return self.__get_conn().get_type() def autostart(self, vmid): self.conn = self.__get_conn() return self.conn.set_autostart(vmid, True) def freemem(self): self.conn = self.__get_conn() return self.conn.getFreeMemory() def shutdown(self, vmid): """ Make the machine with the given vmid stop running. Whatever that takes. """ self.__get_conn() self.conn.shutdown(vmid) return 0 def pause(self, vmid): """ Pause the machine with the given vmid. """ self.__get_conn() return self.conn.suspend(vmid) def unpause(self, vmid): """ Unpause the machine with the given vmid. """ self.__get_conn() return self.conn.resume(vmid) def create(self, vmid): """ Start the machine via the given vmid """ self.__get_conn() return self.conn.create(vmid) def start(self, vmid): """ Start the machine via the given id/name """ self.__get_conn() return self.conn.create(vmid) def destroy(self, vmid): """ Pull the virtual power from the virtual domain, giving it virtually no time to virtually shut down. """ self.__get_conn() return self.conn.destroy(vmid) def undefine(self, vmid): """ Stop a domain, and then wipe it from the face of the earth. (delete disk/config file) """ self.__get_conn() return self.conn.undefine(vmid) def status(self, vmid): """ Return a state suitable for server consumption. Aka, codes.py values, not XM output. """ self.__get_conn() return self.conn.get_status(vmid) def get_xml(self, vmid): """ Receive a Vm id as input Return an xml describing vm config returned by a libvirt call """ conn = libvirt.openReadOnly(None) if not conn: return (-1,'Failed to open connection to the hypervisor') try: domV = conn.lookupByName(vmid) except: return (-1,'Failed to find the main domain') return domV.XMLDesc(0) def get_maxVcpus(self, vmid): """ Gets the max number of VCPUs on a guest """ self.__get_conn() return self.conn.get_maxVcpus(vmid) def get_max_memory(self, vmid): """ Gets the max memory on a guest """ self.__get_conn() return self.conn.get_MaxMemory(vmid) def define(self, xml): """ Define a guest with the given xml """ self.__get_conn() return self.conn.define_from_xml(xml) def core(module): state = module.params.get('state', None) guest = module.params.get('name', None) command = module.params.get('command', None) uri = module.params.get('uri', None) xml = module.params.get('xml', None) v = Virt(uri) res = {} if state and command=='list_vms': res = v.list_vms(state=state) if type(res) != dict: res = { command: res } return VIRT_SUCCESS, res if state: if not guest: module.fail_json(msg = "state change requires a guest specified") res['changed'] = False if state == 'running': if v.status(guest) is not 'running': res['changed'] = True res['msg'] = v.start(guest) elif state == 'shutdown': if v.status(guest) is not 'shutdown': res['changed'] = True res['msg'] = v.shutdown(guest) else: module.fail_json(msg="unexpected state") return VIRT_SUCCESS, res if command: if command in VM_COMMANDS: if not guest: module.fail_json(msg = "%s requires 1 argument: guest" % command) if command == 'define': if not xml: module.fail_json(msg = "define requires xml argument") try: v.get_vm(guest) except VMNotFound: v.define(xml) res = {'changed': True, 'created': guest} return VIRT_SUCCESS, res res = getattr(v, command)(guest) if type(res) != dict: res = { command: res } return VIRT_SUCCESS, res elif hasattr(v, command): res = getattr(v, command)() if type(res) != dict: res = { command: res } return VIRT_SUCCESS, res else: module.fail_json(msg="Command %s not recognized" % basecmd) module.fail_json(msg="expected state or command parameter to be specified") def main(): module = AnsibleModule(argument_spec=dict( name = dict(aliases=['guest']), state = dict(choices=['running', 'shutdown']), command = dict(choices=ALL_COMMANDS), uri = dict(default='qemu:///system'), xml = dict(), )) rc = VIRT_SUCCESS try: rc, result = core(module) except Exception, e: module.fail_json(msg=str(e)) if rc != 0: # something went wrong emit the msg module.fail_json(rc=rc, msg=result) else: module.exit_json(**result) # this is magic, see lib/ansible/module_common.py #<> main()