VNC server for KVM VM

VNC server for KVM VM

[Daniel Bareiro]

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Hi all!

I'm using the following syntax to launch a VM:

$KVM -hda ${DISK_PATH}/aprender00-raiz -hdb ${DISK_PATH}/aprender00-space \
 -m 3584 -boot c -smp 4 -net nic,vlan=0,macaddr=00:16:3e:00:00:61,model=virtio \
 -net tap -daemonize -vnc :3 -k es -localtime -monitor \
 telnet:localhost:4003,server,nowait -serial telnet:localhost:4043,server,nowait


But when I doing a shutdown logged on the VM, apparently the port
associated to VNC server remains active when trying boot it again:

inet_listen: bind(ipv4,0.0.0.0,5903): Address already in use
inet_listen: FAILED

I'm using KVM-88 compiled by myself. It can be a bug?

Thanks in advance.

Regards,
Daniel
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Re: VNC server for KVM VM

[Charles Duffy]

Daniel Bareiro wrote:
> inet_listen: bind(ipv4,0.0.0.0,5903): Address already in use
> inet_listen: FAILED

If you check with netstat, I expect you'll see the port in TIME_WAIT 
state; if so, this will eventually clean itself up if you just wait a 
little bit before restarting.

One option to avoid it is to make sure all connections are closed 
properly on shutdown; another is to set the SO_REUSEADDR flag on the 
socket before the bind() call.

Re: VNC server for KVM VM

[Anthony Liguori]

Charles Duffy wrote:
> Daniel Bareiro wrote:
>> inet_listen: bind(ipv4,0.0.0.0,5903): Address already in use
>> inet_listen: FAILED
>
> If you check with netstat, I expect you'll see the port in TIME_WAIT 
> state; if so, this will eventually clean itself up if you just wait a 
> little bit before restarting.
>
> One option to avoid it is to make sure all connections are closed 
> properly on shutdown; another is to set the SO_REUSEADDR flag on the 
> socket before the bind() call.

We set SO_REUSEADDR.

Regards,

Anthony Liguori

Re: VNC server for KVM VM

[Daniel Bareiro]

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On Friday, 14 August 2009 16:28:00 -0500,
Charles Duffy wrote:

> >inet_listen: bind(ipv4,0.0.0.0,5903): Address already in use
> >inet_listen: FAILED
> 
> If you check with netstat, I expect you'll see the port in TIME_WAIT
> state; if so, this will eventually clean itself up if you just wait a
> little bit before restarting.
> 
> One option to avoid it is to make sure all connections are closed
> properly on shutdown; another is to set the SO_REUSEADDR flag on the
> socket before the bind() call.

Two were the VM to which I did shutdown and later I boot again. These VM
had VNC servers running in 5902 and 5903. Approximately three hours of
boot, I see the following thing with netstat:

root@ss03:~# netstat -puta | grep 590
tcp        0      0 localhost:5900          *:*                     LISTEN      7332/qemu-system-x8
tcp        0      0 *:5901                  *:*                     LISTEN      17528/qemu-system-x
tcp        0      0 localhost:5902          *:*                     LISTEN      30889/qemu-system-x
tcp        0      0 localhost:5903          *:*                     LISTEN      30900/qemu-system-x


Now 5900 and 5901 are the ports that these two machines have assigned. It
are up and running.

Also I have other two VM without shutdown/boot it with associated VNC ports
5904 and 5905, but that don't appear in the listing of netstat, as you can
see. Testing of connection I see that I cannot be connected to any of them
using VNC client, although I don't remember to have observed some error
when launching the KVM processes of each of them, which draws attention to
me.


Thanks for your reply.

Regards,
Daniel
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Re: VNC server for KVM VM

[Anthony Liguori]

Daniel Bareiro wrote:
> Hi all!
>
> I'm using the following syntax to launch a VM:
>
> $KVM -hda ${DISK_PATH}/aprender00-raiz -hdb ${DISK_PATH}/aprender00-space \
>  -m 3584 -boot c -smp 4 -net nic,vlan=0,macaddr=00:16:3e:00:00:61,model=virtio \
>  -net tap -daemonize -vnc :3 -k es -localtime -monitor \
>  telnet:localhost:4003,server,nowait -serial telnet:localhost:4043,server,nowait
>
>
> But when I doing a shutdown logged on the VM, apparently the port
> associated to VNC server remains active when trying boot it again:
>
> inet_listen: bind(ipv4,0.0.0.0,5903): Address already in use
> inet_listen: FAILED
>   

I expect the qemu process enver expected.

Regards,

Anthony Liguori