source: trunk/packages/sipb-xen-remote-server/files/usr/sbin/sipb-xen-remote-create @ 832

Last change on this file since 832 was 816, checked in by y_z, 16 years ago
  • use invirt.config to get hostnames
  • refactoring: extracted bcast() function into invirt.remote package
  • fixed os.rename import bug
  • using correct default paths in invirt-getconf
  • Property svn:executable set to *
File size: 1.5 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) < 2:
24        print >> sys.stderr, "usage: sipb-xen-remote-create <machine> [<other args...>]"
25        return 2
26    machine_name = argv[1]
27    args = argv[2:]
28
29    p = Popen(['/usr/sbin/sipb-xen-remote-proxy-web', 'listvms'], stdout=PIPE)
30    output = p.communicate()[0]
31    if p.returncode != 0:
32        raise RuntimeError("Command '%s' returned non-zero exit status %d"
33                           % ('sipb-xen-remote-proxy-web', p.returncode)) 
34    vms = yaml.load(output, yaml.CSafeLoader)
35
36    if machine_name in vms:
37        host = vms[machine_name]['host']
38        print >> sys.stderr, ("machine '%s' is already running on host %s"
39                              % (machine_name, host))
40        return 1
41
42    host = choose_host()
43    print 'Creating on host %s...' % host
44    sys.stdout.flush()
45    return call(['remctl', host, 'remote', 'control',
46                 machine_name, 'create'] + args)
47
48if __name__ == '__main__':
49    sys.exit(main(sys.argv))
50
51# vim:et:sw=4:ts=4
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