vnc-listen="0.0.0.0" not supported anymore?

vnc-listen="0.0.0.0" not supported anymore?

[Fabrice Delente]

Hello,

This command allowed me to vnc into any virtual machine from anywhere
on my network.

This doesn't work anymore, I can only vnc into a VM if I am on the
server itself: being on the server, 'vncviewer 127.0.0.1:5905' works,
but being on another machine 'vncviewer xenserver:5905' gives me
'connection refused'.

How can I solve this issue, since xend-config.sxp is not used anymore? Thanks!

F. Delente

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Re: vnc-listen="0.0.0.0" not supported anymore?

[George Dunlap]

On Fri, Apr 22, 2016 at 8:01 PM, Fabrice Delente <delentef@gmail.com> wrote:
> Hello,
>
> This command allowed me to vnc into any virtual machine from anywhere
> on my network.
>
> This doesn't work anymore, I can only vnc into a VM if I am on the
> server itself: being on the server, 'vncviewer 127.0.0.1:5905' works,
> but being on another machine 'vncviewer xenserver:5905' gives me
> 'connection refused'.
>
> How can I solve this issue, since xend-config.sxp is not used anymore? Thanks!

Can you please attach your guest config file?

Could you also provide the output of `netstat -nl`?

Thanks.

 -George

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Re: vnc-listen="0.0.0.0" not supported anymore?

[Fabrice Delente]

I have made several tests, I could finally get the old behavior back,
but I had to put

vnc=1
vnclisten="0.0.0.0"
vncpasswd="xxxxx"

in each of my config files, instead of

vfb = [ 'type=vnc,vnc=1,vnclisten=0.0.0.0,vncpasswd=xxxxx' ]

so this vfb=[] must not be supported anymore?

netstat -nl showed clearly that the vnc ports opened by xen where
127.0.0.1 with the vfb=[...] stanza, and they show as 0.0.0.0 with the
separate vnc... lines.

Sorry for the noise, and thanks for xen which I find is an awesome
piece of software!

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Re: vnc-listen="0.0.0.0" not supported anymore?

[Wei Liu]

On Mon, Apr 25, 2016 at 11:52:29AM +0200, Fabrice Delente wrote:
> I have made several tests, I could finally get the old behavior back,
> but I had to put
> 
> vnc=1
> vnclisten="0.0.0.0"
> vncpasswd="xxxxx"
> 
> in each of my config files, instead of
> 
> vfb = [ 'type=vnc,vnc=1,vnclisten=0.0.0.0,vncpasswd=xxxxx' ]
> 
> so this vfb=[] must not be supported anymore?
> 
> netstat -nl showed clearly that the vnc ports opened by xen where
> 127.0.0.1 with the vfb=[...] stanza, and they show as 0.0.0.0 with the
> separate vnc... lines.
> 

Is this a pv or hvm guest? Mind pasting in the whole guest config?

I remember I wrote patch to deal with problem in this area long time
ago. Maybe there is something I missed.

Wei.

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Re: vnc-listen="0.0.0.0" not supported anymore?

[Fabrice Delente]

Here is the config file for one of machines:

builder = 'hvm'
memory = 2048
videoram = 8
vcpus  = 1
name = "antivirus"
vif = [ 'bridge=xen-bridge' ]
disk = [ 'phy:/dev/vg0/antivirus,hda,w' ]# ,
'file:/root/windows7pro64bits.iso,hdc:cdrom,r' ]
acpi = 1
#device_model = 'qemu-dm'
boot = "c" # d"
sdl = 0
vnc = 1
serial = 'pty'
vfb = [ 'type=vnc,vnc=1,vnclisten=0.0.0.0,vncpasswd=xxxxx' ]
usbdevice = 'tablet'
keymap = "fr"

vnc=1
vnclisten='0.0.0.0'
vncpasswd='xxxxx'

Best regards,

F. Delente

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Re: vnc-listen="0.0.0.0" not supported anymore?

[Wei Liu]

On Mon, Apr 25, 2016 at 12:03:00PM +0200, Fabrice Delente wrote:
> Here is the config file for one of machines:
> 
> builder = 'hvm'

Oh right, so this is HVM guest.

A snippet from the manpage of xl.cfg for vfb=[] options:

  This option does not control the emulated graphics card presented to an HVM guest. See
  "Emulated VGA Graphics Device" below for how to configure the emulated device. If "Emulated
  VGA Graphics Device" options are used in a PV guest configuration, xl will pick up vnc,
  vnclisten, vncpasswd, vncdisplay, vncunused, sdl, opengl and keymap to construct
  paravirtual framebuffer device for the guest.

So I think xl ignoring vfb= for hvm guest is the expected behaviour.

P.S. Please use reply-all button in gmail in the future.

Wei.

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Re: vnc-listen="0.0.0.0" not supported anymore?

[Fabrice Delente]

OK, thanks for everything, I had overlooked that part.

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Re: vnc-listen="0.0.0.0" not supported anymore?

[George Dunlap]

On Mon, Apr 25, 2016 at 11:35 AM, Wei Liu <wei.liu2@citrix.com> wrote:
> On Mon, Apr 25, 2016 at 12:03:00PM +0200, Fabrice Delente wrote:
>> Here is the config file for one of machines:
>>
>> builder = 'hvm'
>
> Oh right, so this is HVM guest.
>
> A snippet from the manpage of xl.cfg for vfb=[] options:
>
>   This option does not control the emulated graphics card presented to an HVM guest. See
>   "Emulated VGA Graphics Device" below for how to configure the emulated device. If "Emulated
>   VGA Graphics Device" options are used in a PV guest configuration, xl will pick up vnc,
>   vnclisten, vncpasswd, vncdisplay, vncunused, sdl, opengl and keymap to construct
>   paravirtual framebuffer device for the guest.
>
> So I think xl ignoring vfb= for hvm guest is the expected behaviour.

/me wonders if it would make sense to have xl warn about ignored
settings (particularly settings which are valid in another mode).

 -George

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