469 lines
13 KiB
Python
469 lines
13 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""
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Virt management features
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Copyright 2007, 2012 Red Hat, Inc
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Michael DeHaan <michael.dehaan@gmail.com>
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Seth Vidal <skvidal@fedoraproject.org>
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This software may be freely redistributed under the terms of the GNU
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general public license.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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DOCUMENTATION = '''
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---
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module: virt
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short_description: Manages virtual machines supported by libvirt
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description:
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- Manages virtual machines supported by I(libvirt).
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version_added: "0.2"
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options:
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name:
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description:
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- name of the guest VM being managed. Note that VM must be previously
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defined with xml.
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required: true
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default: null
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aliases: []
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state:
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description:
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- Note that there may be some lag for state requests like C(shutdown)
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since these refer only to VM states. After starting a guest, it may not
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be immediately accessible.
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required: false
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choices: [ "running", "shutdown" ]
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default: "no"
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command:
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description:
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- in addition to state management, various non-idempotent commands are available. See examples
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required: false
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choices: ["create","status", "start", "stop", "pause", "unpause",
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"shutdown", "undefine", "destroy", "get_xml", "autostart",
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"freemem", "list_vms", "info", "nodeinfo", "virttype", "define"]
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uri:
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description:
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- libvirt connection uri
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required: false
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defaults: qemu:///system
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xml:
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description:
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- XML document used with the define command
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required: false
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default: null
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requirements: [ "libvirt" ]
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author: Michael DeHaan, Seth Vidal
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'''
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EXAMPLES = '''
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# a playbook task line:
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tasks:
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- virt: name=alpha state=running
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# /usr/bin/ansible invocations
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ansible host -m virt -a "name=alpha command=status"
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ansible host -m virt -a "name=alpha command=get_xml"
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ansible host -m virt -a "name=alpha command=create uri=lxc:///"
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# a playbook example of defining and launching an LXC guest
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tasks:
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- name: define vm
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virt: name=foo command=define xml="{{ lookup('template', 'container-template.xml.j2') }}" uri=lxc:///
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- name: start vm
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virt: name=foo state=running uri=lxc:///
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'''
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VIRT_FAILED = 1
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VIRT_SUCCESS = 0
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VIRT_UNAVAILABLE=2
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import sys
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try:
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import libvirt
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except ImportError:
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print "failed=True msg='libvirt python module unavailable'"
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sys.exit(1)
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ALL_COMMANDS = []
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VM_COMMANDS = ['create','status', 'start', 'stop', 'pause', 'unpause',
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'shutdown', 'undefine', 'destroy', 'get_xml', 'autostart', 'define']
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HOST_COMMANDS = ['freemem', 'list_vms', 'info', 'nodeinfo', 'virttype']
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ALL_COMMANDS.extend(VM_COMMANDS)
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ALL_COMMANDS.extend(HOST_COMMANDS)
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VIRT_STATE_NAME_MAP = {
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0 : "running",
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1 : "running",
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2 : "running",
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3 : "paused",
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4 : "shutdown",
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5 : "shutdown",
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6 : "crashed"
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}
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class VMNotFound(Exception): pass
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class LibvirtConnection(object):
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def __init__(self, uri):
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cmd = subprocess.Popen("uname -r", shell=True, stdout=subprocess.PIPE,
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close_fds=True)
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output = cmd.communicate()[0]
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if output.find("xen") != -1:
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conn = libvirt.open(None)
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else:
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conn = libvirt.open(uri)
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if not conn:
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raise Exception("hypervisor connection failure")
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self.conn = conn
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def find_vm(self, vmid):
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"""
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Extra bonus feature: vmid = -1 returns a list of everything
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"""
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conn = self.conn
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vms = []
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# this block of code borrowed from virt-manager:
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# get working domain's name
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ids = conn.listDomainsID()
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for id in ids:
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vm = conn.lookupByID(id)
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vms.append(vm)
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# get defined domain
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names = conn.listDefinedDomains()
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for name in names:
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vm = conn.lookupByName(name)
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vms.append(vm)
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if vmid == -1:
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return vms
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for vm in vms:
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if vm.name() == vmid:
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return vm
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raise VMNotFound("virtual machine %s not found" % vmid)
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def shutdown(self, vmid):
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return self.find_vm(vmid).shutdown()
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def pause(self, vmid):
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return self.suspend(self.conn,vmid)
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def unpause(self, vmid):
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return self.resume(self.conn,vmid)
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def suspend(self, vmid):
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return self.find_vm(vmid).suspend()
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def resume(self, vmid):
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return self.find_vm(vmid).resume()
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def create(self, vmid):
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return self.find_vm(vmid).create()
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def destroy(self, vmid):
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return self.find_vm(vmid).destroy()
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def undefine(self, vmid):
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return self.find_vm(vmid).undefine()
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def get_status2(self, vm):
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state = vm.info()[0]
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return VIRT_STATE_NAME_MAP.get(state,"unknown")
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def get_status(self, vmid):
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state = self.find_vm(vmid).info()[0]
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return VIRT_STATE_NAME_MAP.get(state,"unknown")
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def nodeinfo(self):
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return self.conn.getInfo()
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def get_type(self):
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return self.conn.getType()
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def get_maxVcpus(self, vmid):
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vm = self.conn.lookupByName(vmid)
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return vm.maxVcpus()
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def get_maxMemory(self, vmid):
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vm = self.conn.lookupByName(vmid)
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return vm.maxMemory()
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def getFreeMemory(self):
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return self.conn.getFreeMemory()
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def get_autostart(self, vmid):
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vm = self.conn.lookupByName(vmid)
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return vm.autostart()
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def set_autostart(self, vmid, val):
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vm = self.conn.lookupByName(vmid)
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return vm.setAutostart(val)
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def define_from_xml(self, xml):
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return self.conn.defineXML(xml)
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class Virt(object):
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def __init__(self, uri):
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self.uri = uri
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def __get_conn(self):
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self.conn = LibvirtConnection(self.uri)
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return self.conn
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def get_vm(self, vmid):
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self.__get_conn()
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return self.conn.find_vm(vmid)
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def state(self):
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vms = self.list_vms()
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state = []
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for vm in vms:
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state_blurb = self.conn.get_status(vm)
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state.append("%s %s" % (vm,state_blurb))
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return state
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def info(self):
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vms = self.list_vms()
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info = dict()
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for vm in vms:
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data = self.conn.find_vm(vm).info()
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# libvirt returns maxMem, memory, and cpuTime as long()'s, which
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# xmlrpclib tries to convert to regular int's during serialization.
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# This throws exceptions, so convert them to strings here and
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# assume the other end of the xmlrpc connection can figure things
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# out or doesn't care.
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info[vm] = {
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"state" : VIRT_STATE_NAME_MAP.get(data[0],"unknown"),
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"maxMem" : str(data[1]),
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"memory" : str(data[2]),
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"nrVirtCpu" : data[3],
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"cpuTime" : str(data[4]),
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}
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info[vm]["autostart"] = self.conn.get_autostart(vm)
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return info
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def nodeinfo(self):
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self.__get_conn()
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info = dict()
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data = self.conn.nodeinfo()
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info = {
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"cpumodel" : str(data[0]),
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"phymemory" : str(data[1]),
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"cpus" : str(data[2]),
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"cpumhz" : str(data[3]),
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"numanodes" : str(data[4]),
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"sockets" : str(data[5]),
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"cpucores" : str(data[6]),
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"cputhreads" : str(data[7])
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}
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return info
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def list_vms(self):
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self.conn = self.__get_conn()
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vms = self.conn.find_vm(-1)
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results = []
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for x in vms:
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try:
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results.append(x.name())
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except:
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pass
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return results
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def virttype(self):
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return self.__get_conn().get_type()
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def autostart(self, vmid):
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self.conn = self.__get_conn()
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return self.conn.set_autostart(vmid, True)
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def freemem(self):
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self.conn = self.__get_conn()
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return self.conn.getFreeMemory()
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def shutdown(self, vmid):
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""" Make the machine with the given vmid stop running. Whatever that takes. """
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self.__get_conn()
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self.conn.shutdown(vmid)
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return 0
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def pause(self, vmid):
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""" Pause the machine with the given vmid. """
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self.__get_conn()
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return self.conn.suspend(vmid)
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def unpause(self, vmid):
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""" Unpause the machine with the given vmid. """
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self.__get_conn()
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return self.conn.resume(vmid)
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def create(self, vmid):
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""" Start the machine via the given vmid """
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self.__get_conn()
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return self.conn.create(vmid)
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def start(self, vmid):
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""" Start the machine via the given id/name """
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self.__get_conn()
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return self.conn.create(vmid)
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def destroy(self, vmid):
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""" Pull the virtual power from the virtual domain, giving it virtually no time to virtually shut down. """
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self.__get_conn()
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return self.conn.destroy(vmid)
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def undefine(self, vmid):
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""" Stop a domain, and then wipe it from the face of the earth. (delete disk/config file) """
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self.__get_conn()
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return self.conn.undefine(vmid)
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def status(self, vmid):
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"""
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Return a state suitable for server consumption. Aka, codes.py values, not XM output.
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"""
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self.__get_conn()
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return self.conn.get_status(vmid)
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def get_xml(self, vmid):
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"""
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Receive a Vm id as input
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Return an xml describing vm config returned by a libvirt call
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"""
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conn = libvirt.openReadOnly(None)
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if not conn:
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return (-1,'Failed to open connection to the hypervisor')
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try:
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domV = conn.lookupByName(vmid)
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except:
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return (-1,'Failed to find the main domain')
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return domV.XMLDesc(0)
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def get_maxVcpus(self, vmid):
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"""
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Gets the max number of VCPUs on a guest
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"""
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self.__get_conn()
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return self.conn.get_maxVcpus(vmid)
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def get_max_memory(self, vmid):
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"""
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Gets the max memory on a guest
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"""
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self.__get_conn()
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return self.conn.get_MaxMemory(vmid)
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def define(self, xml):
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"""
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Define a guest with the given xml
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"""
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self.__get_conn()
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return self.conn.define_from_xml(xml)
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def core(module):
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state = module.params.get('state', None)
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guest = module.params.get('name', None)
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command = module.params.get('command', None)
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uri = module.params.get('uri', None)
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xml = module.params.get('xml', None)
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v = Virt(uri)
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res = {}
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if state:
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if not guest:
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module.fail_json(msg = "state change requires a guest specified")
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res['changed'] = False
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if state == 'running':
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if v.status(guest) is not 'running':
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res['changed'] = True
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res['msg'] = v.start(guest)
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elif state == 'shutdown':
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if v.status(guest) is not 'shutdown':
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res['changed'] = True
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res['msg'] = v.shutdown(guest)
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else:
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module.fail_json(msg="unexpected state")
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return VIRT_SUCCESS, res
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if command:
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if command in VM_COMMANDS:
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if not guest:
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module.fail_json(msg = "%s requires 1 argument: guest" % command)
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if command == 'define':
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if not xml:
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module.fail_json(msg = "define requires xml argument")
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try:
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v.get_vm(guest)
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except VMNotFound:
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v.define(xml)
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res = {'changed': True, 'created': guest}
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return VIRT_SUCCESS, res
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res = getattr(v, command)(guest)
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if type(res) != dict:
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res = { command: res }
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return VIRT_SUCCESS, res
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elif hasattr(v, command):
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res = getattr(v, command)()
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if type(res) != dict:
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res = { command: res }
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return VIRT_SUCCESS, res
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else:
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module.fail_json(msg="Command %s not recognized" % basecmd)
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module.fail_json(msg="expected state or command parameter to be specified")
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def main():
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module = AnsibleModule(argument_spec=dict(
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name = dict(aliases=['guest']),
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state = dict(choices=['running', 'shutdown']),
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command = dict(choices=ALL_COMMANDS),
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uri = dict(default='qemu:///system'),
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xml = dict(),
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))
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rc = VIRT_SUCCESS
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try:
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rc, result = core(module)
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except Exception, e:
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module.fail_json(msg=str(e))
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if rc != 0: # something went wrong emit the msg
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module.fail_json(rc=rc, msg=result)
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else:
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module.exit_json(**result)
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# this is magic, see lib/ansible/module_common.py
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#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
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main()
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