Most of times I use virt-manager to manage VMs but sometimes, I have to manage VMs on other hosts over ssh when connected over VPN or while I am working remotely. GUI like virt-manager thus becomes slow, and hence I like to use cli commands and nothing is better than virsh. But here is simple script that I use sometimes to manage the VMs with CLI based menu. Hope you find it useful.
#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2016 Amit Agarwal <http://blog.amit-agarwal.co.in>
# Python scripts to manage virtual machines.
#
# Distributed under terms of the MIT license.
"""
python wrapper for libvirt
"""
import libvirt
import sys
import pprint
from xml.dom import minidom
import os
hv_host="localhost"
names = []
def chhost():
global hv_host
global uri
global conn
print "Host is now set to "+hv_host
try:
ui = raw_input ("Provide the uri in format user@host : ")
except:
ui=''
if len(ui) > 2 :
if uri.find("lxc") :
print "Using LXC uri"
else:
uri = "qemu+ssh://"+ui+"/system"
else:
uri = "qemu:///system"
print uri + " is set as URI"
conn = libvirt.open(uri)
if conn == None:
print 'Failed to open connection to the hypervisor'
sys.exit(1)
else:
print "Connection established with "+uri
def vms(state):
global names
global conn
if state == 'running' :
active_hosts = conn.listDomainsID()
if (len (active_hosts) == 0 ) :
print "No Running VMs"
return
for i in range ( len (active_hosts) ):
dom0 = conn.lookupByID(active_hosts[i])
print "\t%d\t%s"%(active_hosts[i], dom0.name())
val = input ( "Enter the ID ")
return int(val)
else :
names = conn.listDefinedDomains()
for i in range ( len (names) ):
print "\t%d\t%s" %(i, names[i])
tostart = input("Please enter number to start the VM :: ")
print "Starting VM "+names[tostart]
return names[tostart]
def writer(stream, data, buffer):
buffer.write(data)
def start():
global names
global conn
tostart = vms('')
dom0 = conn.lookupByName(tostart)
dom0.create()
def stop():
print "List currently running VMs"
val = vms('running')
dom0 = conn.lookupByID(val)
dom0.shutdown()
def view():
print "List currently running VMs"
val = vms('running')
dom0 = conn.lookupByID(val)
os.system("virt-viewer " + dom0.name() + " &" );
def viewip():
val = vms('running')
print "ID Returned is "+str(val)
dom0 = conn.lookupByID(val)
pprint.pprint (dom0.info())
# pprint.pprint (dom0.GetInterfacesAddresses())
for lease in conn.networkLookupByName("default").DHCPLeases():
print(lease)
raw_xml = dom0.XMLDesc (0)
xml = minidom.parseString (raw_xml)
interfaceTypes = xml.getElementsByTagName ( 'interface')
for interfaceType in interfaceTypes :
print ( 'interface: type=' +interfaceType.getAttribute ( 'type'))
interfaceNodes = interfaceType.childNodes
for interfaceNode in interfaceNodes :
if interfaceNode.nodeName [0:1] != '#' :
print ( ' ' +interfaceNode.nodeName)
for attr in interfaceNode.attributes.keys ():
print ( ' ' +interfaceNode .attributes[attr].name + ' = ' + interfaceNode.attributes[attr].value)
print 'View'
def state_to_string (state):
statearr = [ "", "Running" ]
return statearr[state[0]]
def info(dom):
states = {
libvirt.VIR_DOMAIN_NOSTATE: 'no state',
libvirt.VIR_DOMAIN_RUNNING: 'running',
libvirt.VIR_DOMAIN_BLOCKED: 'blocked on resource',
libvirt.VIR_DOMAIN_PAUSED: 'paused by user',
libvirt.VIR_DOMAIN_SHUTDOWN: 'being shut down',
libvirt.VIR_DOMAIN_SHUTOFF: 'shut off',
libvirt.VIR_DOMAIN_CRASHED: 'crashed',
}
[state, maxmem, mem, ncpu, cputime] = dom.info()
return '%s' % (states.get(state, state))
def viewdets():
global conn
global names
columns = 3
domains = map(conn.lookupByName, names)
ids = conn.listDomainsID()
running = map(conn.lookupByID, ids)
print 'Defined domains:'
for row in map(None, *[iter(domains)] * columns):
for domain in row:
if domain:
print "%s, %s" %( dom.name(), info(domain)),
print
print
print 'Running domains:'
for row in map(None, *[iter(running)] * columns):
for domain in row:
if domain:
print info(domain),
print
print "Id Name State"
print "-" * 52
for dom in conn.listAllDomains() :
[state, maxmem, mem, ncpu, cputime] = dom.info()
print "%3s %-31s%s" %\
(dom.ID() if dom.ID() > 0 else "-",
dom.name(),
info(dom))
# if dom.ID() > 0:
# cpu_stats = dom.getCPUStats(False)
# for (i, cpu) in enumerate(cpu_stats):
# print 'CPU #%d Time: %.2lf sec' % (i, cpu['cpu_time'] / 1000000000.0 )
print "View all details"
print names
active_hosts = conn.listDomainsID()
if len ( active_hosts ) > 0 :
for id in active_hosts:
dom = conn.lookupByID(id)
infos = dom.info()
print 'ID = %d' % id
print 'Name = %s' % dom.name()
print 'State = %d' % infos[0]
print 'Max Memory = %d' % infos[1]
print 'Number of virt CPUs = %d' % infos[3]
print 'CPU Time (in ns) = %d' % infos[2]
print ' '
def quit():
print "Exit on user request"
sys.exit(0)
def menu():
mm = [ {
'Description': 'Change the host',
'function' : chhost,
},
{
'Description' : 'Start a Container' ,
'function' : start
},
{
'Description' : 'View a container',
'function' : view
},
{
'Description' : 'Stop a container',
'function' : stop
},
{
'Description' : "Take Screenshot",
'function' : screenshot,
},
{
'Description' :'View IP of Container',
'function' : viewip,
},
{
'Description' : 'View all Details of Conatainer',
'function' : viewdets,
},
{
'Description' : 'Quit',
'function' : quit,
},
]
print "Virsh wrapper by Amit Agarwal"
i = 0
for i in range ( len (mm) ):
print "\t%d) %s" % (i, mm[i]['Description'] )
try:
val = int(raw_input ("Please Select ::"))
except:
val=-1
print len(mm)
if val >= 0 and val < len (mm) :
mm[val]['function']()
uri = "qemu:///system"
conn = libvirt.open(uri)
if conn == None:
print 'Failed to open connection to the hypervisor'
sys.exit(1)
while 1:
menu()