source: trunk/packages/invirt-remote-server/files/usr/sbin/invirt-remote-create @ 1176

Last change on this file since 1176 was 1176, checked in by price, 15 years ago

sipb-xen -> invirt for remote-server

  • Property svn:executable set to *
File size: 2.0 KB
Line 
1#!/usr/bin/python
2
3"""
4Picks a host to "create" (boot) a VM on, and does so.
5
6Current load-balancing algorithm: wherever there's more free RAM.
7
8TODO: use a lock to avoid creating the same VM twice in a race
9"""
10
11from invirt.remote import bcast
12from subprocess import PIPE, Popen, call
13import sys
14import yaml
15
16def choose_host():
17    # Query each of the hosts.
18    # XXX will the output of 'xm info' always be parseable YAML?
19    results = bcast('info')
20    return max((int(o['free_memory']), s) for (s, o) in results)[1]
21
22def main(argv):
23    if len(argv) < 3:
24        print >> sys.stderr, "usage: invirt-remote-create <operation> <machine> [<other args...>]"
25        return 2
26    operation = argv[1]
27    machine_name = argv[2]
28    args = argv[3:]
29   
30    if operation == 'install':
31        options = dict(arg.split('=', 1) for arg in args)
32        valid_keys = set(('mirror', 'dist', 'arch', 'imagesize', 'noinstall'))
33        if not set(options.keys()).issubset(valid_keys):
34            print >> sys.stderr, "Invalid argument. Use the help command to see valid arguments to install"
35            return 1
36        if any(' ' in val for val in options.values()):
37            print >> sys.stderr, "Arguments to the autoinstaller cannot contain spaces"
38            return 1
39
40    p = Popen(['/usr/sbin/invirt-remote-proxy-web', 'listvms'], stdout=PIPE)
41    output = p.communicate()[0]
42    if p.returncode != 0:
43        raise RuntimeError("Command '%s' returned non-zero exit status %d"
44                           % ('invirt-remote-proxy-web', p.returncode)) 
45    vms = yaml.load(output, yaml.CSafeLoader)
46
47    if machine_name in vms:
48        host = vms[machine_name]['host']
49        print >> sys.stderr, ("machine '%s' is already running on host %s"
50                              % (machine_name, host))
51        return 1
52
53    host = choose_host()
54    print 'Creating on host %s...' % host
55    sys.stdout.flush()
56    return call(['remctl', host, 'remote', 'control',
57                 machine_name, operation] + args)
58
59if __name__ == '__main__':
60    sys.exit(main(sys.argv))
61
62# vim:et:sw=4:ts=4
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