VNC with KVM-84 doesn't work

VNC with KVM-84 doesn't work

[Robert Wimmer]

Hi!

I'm using kernel 2.6.28-r2 (Gentoo) and kvm-84 (Intel Xeon CPU X7350,
x86_64, host and guest OS and kernel are the same)

I've normally bound the VNC port to 127.0.0.1:4444 (or 4445, ... if more
KVMs are running). But now "netstat -tlpn" doesn't show any KVM bound to
localhost. KVM-83 and all other versions before haven't had this
problem. I'm always starting the KVMs like this (snippet of the start
script):

$KVM -m $MEMORY \
-smp $CPU \
-curses \
-daemonize \
-k de \
-vnc "$VNC" \
-monitor "$MONITOR" \
-localtime \
-pidfile /var/run/kvm-$KVMNAME.pid \
-drive
file=/data/kvm/kvmimages/$KVMNAME.qcow2,if=virtio,boot=on \
-net nic,vlan=104,model=virtio,macaddr=$MACADDR_B \
-net tap,vlan=104,ifname=tap.b.$KVMNAME,script=no \
-net nic,vlan=96,model=virtio,macaddr=$MACADDR_F \
-net tap,vlan=96,ifname=tap.f.$KVMNAME,script=no

$VNC is 127.0.0.1:1 for example. KVM images running fine but no VNC port
to connect. Connecting with telnet to the kvm and entering "info vnc"
tells me "VNC server disabled". But I haven't disabled it.

Additionally after starting a KVM with this script I don't see the
cursor of my bash anymore. The screen get's cleared, the prompt appears
again and I've to type "exit" on the shell blindly and reconnect to the
host to get my cursor back.

Thanks for any hints!
Robert

Re: VNC with KVM-84 doesn't work

[Anthony Liguori]

Robert Wimmer wrote:
> Hi!
>
> I'm using kernel 2.6.28-r2 (Gentoo) and kvm-84 (Intel Xeon CPU X7350,
> x86_64, host and guest OS and kernel are the same)
>
> I've normally bound the VNC port to 127.0.0.1:4444 (or 4445, ... if more
> KVMs are running). But now "netstat -tlpn" doesn't show any KVM bound to
> localhost. KVM-83 and all other versions before haven't had this
> problem. I'm always starting the KVMs like this (snippet of the start
> script):
>
> $KVM -m $MEMORY \
> -smp $CPU \
> -curses \
> -daemonize \
> -k de \
> -vnc "$VNC" \
> -monitor "$MONITOR" \
> -localtime \
> -pidfile /var/run/kvm-$KVMNAME.pid \
> -drive
> file=/data/kvm/kvmimages/$KVMNAME.qcow2,if=virtio,boot=on \
> -net nic,vlan=104,model=virtio,macaddr=$MACADDR_B \
> -net tap,vlan=104,ifname=tap.b.$KVMNAME,script=no \
> -net nic,vlan=96,model=virtio,macaddr=$MACADDR_F \
> -net tap,vlan=96,ifname=tap.f.$KVMNAME,script=no
>   

You cannot combine -curses and -vnc.

Regards,

Anthony Liguori

Re: VNC with KVM-84 doesn't work

[Robert Wimmer]

Anthony Liguori wrote:
> Robert Wimmer wrote:
>> Hi!
>>
>> I'm using kernel 2.6.28-r2 (Gentoo) and kvm-84 (Intel Xeon CPU X7350,
>> x86_64, host and guest OS and kernel are the same)
>>
>> I've normally bound the VNC port to 127.0.0.1:4444 (or 4445, ... if more
>> KVMs are running). But now "netstat -tlpn" doesn't show any KVM bound to
>> localhost. KVM-83 and all other versions before haven't had this
>> problem. I'm always starting the KVMs like this (snippet of the start
>> script):
>>
>> $KVM -m $MEMORY \
>> -smp $CPU \
>> -curses \
>> -daemonize \
>> -k de \
>> -vnc "$VNC" \
>> -monitor "$MONITOR" \
>> -localtime \
>> -pidfile /var/run/kvm-$KVMNAME.pid \
>> -drive
>> file=/data/kvm/kvmimages/$KVMNAME.qcow2,if=virtio,boot=on \
>> -net nic,vlan=104,model=virtio,macaddr=$MACADDR_B \
>> -net tap,vlan=104,ifname=tap.b.$KVMNAME,script=no \
>> -net nic,vlan=96,model=virtio,macaddr=$MACADDR_F \
>> -net tap,vlan=96,ifname=tap.f.$KVMNAME,script=no
>>   
>
> You cannot combine -curses and -vnc.
>
> Regards,
>
> Anthony Liguori
>
Thanks! That helped. But it's strange this I'm using this since kvm-78
(at least).

Regards,
Robert

Re: VNC with KVM-84 doesn't work

[Florent]

Anthony Liguori a écrit :
> You cannot combine -curses and -vnc.

Simple dummy questions:
Why cannot we combine visualization options?
In other words, what prevent forks of back-end video message processing 
in order to have multiple views of the same virtual machines at the same 
time?

And the corollary is:
Why cannot we switch on/off available visualizations (ncurses, vnc, sdl) 
at runtime (for instance: using the monitor)?
I mainly use VM as services: they are started with vnc display without 
any viewer attached, this configuration allows local and remote accesses 
to the VM display. But this configuration is static. Sometimes, I would 
like to enable the SDL viewer without restarting the whole VM.

Regards,

- Florent

Re: VNC with KVM-84 doesn't work

[Anthony Liguori]

Florent wrote:
> Anthony Liguori a écrit :
>> You cannot combine -curses and -vnc.
>
> Simple dummy questions:
> Why cannot we combine visualization options?
> In other words, what prevent forks of back-end video message 
> processing in order to have multiple views of the same virtual 
> machines at the same time?
>
> And the corollary is:
> Why cannot we switch on/off available visualizations (ncurses, vnc, 
> sdl) at runtime (for instance: using the monitor)?
> I mainly use VM as services: they are started with vnc display without 
> any viewer attached, this configuration allows local and remote 
> accesses to the VM display. But this configuration is static. 
> Sometimes, I would like to enable the SDL viewer without restarting 
> the whole VM.

There is an effort to make the video subsystem in QEMU more dynamic to 
support the sort of features you're talking about it.  We're slowly 
getting there.  It's just a matter of developer effort being a finite 
resource.

Regards,

Anthony Liguori

> Regards,
>
> - Florent
>
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Re: VNC with KVM-84 doesn't work

[Florent]

Anthony Liguori a écrit :
> There is an effort to make the video subsystem in QEMU more dynamic to 
> support the sort of features you're talking about it.  We're slowly 
> getting there.  It's just a matter of developer effort being a finite 
> resource.

You're right, speaking as the manager of two open-source projects, the 
problem is the same everywhere :) Although I'm not a C++ guru, I'll see 
what I can do with qemu.

Regards,

- Florent