Re: [Xen-devel] remote xend - howto connect??

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Michael Mey wrote:
> Hi,
>
> currently, I am planning to implement a command line based tool to query more 
> than one xends for their running domains at the same time.
> Unfortunately, I cannot connect to any other xend as the local one. This is 
> what I was trying to do:
> ----------------------------------------------------------------------------------------------------
> #!/usr/bin/env python
> #  -*- mode: python; -*-
> import sys
> import os
>
> # add fallback path for non-native python path installs if needed
> sys.path.append('/usr/lib/python')
> sys.path.append('/usr/lib64/python')
>
> from xen.xend.XendClient import server
>   
from xen.xend.XendClient import getHttpServer

server = getHttpServer(...)

Of course, I'm not sure works all that well either.

I'd recommend using libvir (http://www.libvir.org).  libvir speaks the 
S-Expression/HTTP protocol pretty well.  It also has python bindings.
Regards,

Anthony Liguori
> from xen.xend import sxp
>
> def parse_doms_info(info):
>    def get_info(n, t, d):
>       return t(sxp.child_value(info, n, d))
>    return {
>       'dom'      : get_info('domid',        int,   -1),
>       'name'     : get_info('name',         str,   '??'),
>       'mem'      : get_info('memory',       int,   0),
>       'vcpus'    : get_info('online_vcpus', int,   0),
>       'state'    : get_info('state',        str,   '??'),
>       'cpu_time' : get_info('cpu_time',     float, 0),
>       'ssidref'  : get_info('ssidref',      int,   0),
>    }
>
> def xm_brief_list(doms):
>    print 'Name                              ID Mem(MiB) VCPUs State  Time(s)'
>    for dom in doms:
>       d = parse_doms_info(dom)
>       if (d['ssidref'] != 0):
>           d['ssidstr'] = (" s:%04x/p:%04x" %
>                           ((d['ssidref'] >> 16) & 0xffff,
>                           d['ssidref']        & 0xffff))
>       else:
>          d['ssidstr'] = ""
>          print ("%(name)-32s %(dom)3d %(mem)8d %(vcpus)5d %(state)5s            
>    
> %(cpu_time)7.1f%(ssidstr)s" % d)
>
>
> server.bind('192.168.111.18:8000',)
> xm_brief_list(server.xend_list_domains())
> ----------------------------------------------------------------------------------------------------
>
> I am running this script form my xenhost1 (192.168.111.17) and want to query 
> xenhost2 (192.168.111.18). But I only get the local informations.
> Even if I manually hack
>
> class Xend:
>     """Client interface to Xend.
>     """
>
>     """Default location of the xend server."""
>     SRV_DEFAULT = "192.168.111.18:8000"
>
> into xen/xend/XendClient.py it's still the same.
>
> telnetting to 192.168.111.18 to port 8000 and do a manual
> GET /xend/domain/?detail=1
> works nicely.
>
> Maybe someone could give me a hint how to query a remote xen host with 
> XendClient.py? 
>
> Regards, Michael
>
>   
> ------------------------------------------------------------------------
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>   
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