Re: [Fedora-xen] [Xen-devel] [TestDay] xen 4.4 FC3 xl create error

[M A Young]

On Tue, 4 Feb 2014, Ian Campbell wrote:
> On Tue, 2014-02-04 at 08:26 -0700, Eric Houby wrote:
> > Xen list,
> >
> > I have a clean F20 install with the RC3 RPMs and see an error when
> > starting a VM.  A similar issue was seen with the RC2 RPMs.
>
> Thanks for the report.
> > [root@xen ~]# xl create f20.xl
> > Parsing config from f20.xl
> > libxl: error: libxl_create.c:1054:domcreate_launch_dm: unable to add
> > disk devices
> > libxl: error: libxl_dm.c:1467:kill_device_model: unable to find device
> > model pid in /local/domain/2/image/device-model-pid
> > libxl: error: libxl.c:1425:libxl__destroy_domid:
> > libxl__destroy_device_model failed for 2
> > libxl: error: libxl_device.c:780:libxl__initiate_device_remove: unable
> > to get my domid
> > libxl: error: libxl.c:1461:devices_destroy_cb: libxl__devices_destroy
> > failed for 2
> > [root@xen ~]#
> > [root@xen ~]# /usr/bin/xenstore-write "/local/domain/0/domid" 0
> > [root@xen ~]#
> > [root@xen ~]# xl create f20.xl
> > Parsing config from f20.xl
> > [root@xen ~]#
> > [root@xen ~]#
> > [root@xen ~]# xl list
> > Name                                        ID   Mem VCPUs	State	Time(s)
> > Domain-0                                     0  2047     2     r-----
> > 19.7
> > f20                                          3  4095     1     r-----
> > 4.1
> >
> > After running the xenstore-write command VMs start up without issue.
>
> This is a bug in the Fedora versions of the initscripts (or I suppose
> these days they are systemd unit files or whatever). The sysvinit
> scripts shipped with Xen itself have this write in already.

I am puzzled by this as the systemd files in the Fedora RC3 test build do 
indeed run
/usr/bin/xenstore-write "/local/domain/0/domid" 0
so I am not sure why it isn't being set in this case. It certainly works 
for me.
> We should probably consider taking some unit files into the xen tree, if
> someone wants to submit a set?

I can submit a set, which start services individually rather than a 
unified xencommons style start file. I didn't find a good way to reproduce 
the xendomains script, so I ended running an edited version of the 
sysvinit script with a systemd wrapper file.

Would it make sense to have some sort of configure option tools to choose 
between sysvinit and systemd?

Michael Young

[Xen-devel] [TestDay] xen 4.4 FC3 xl create error

[M A Young]

On Tue, 4 Feb 2014, M A Young wrote:
> I am puzzled by this as the systemd files in the Fedora RC3 test build do 
> indeed run
> /usr/bin/xenstore-write "/local/domain/0/domid" 0
> so I am not sure why it isn't being set in this case. It certainly works for 
> me.

I have now worked out what the problem is. There are alternate 
systemd files, one for xenstored and one for oxenstored (if it is 
installed) and I only added the line
/usr/bin/xenstore-write "/local/domain/0/domid" 0
to the xenstored one, so if the rpm containing oxenstored was installed 
it would produce the behaviour as reported in this thread.

Michael Young