[pve-devel] pvedaemon hanging because of qga retry

[Dietmar Maurer]

> On May 20, 2018 at 3:22 AM Alexandre DERUMIER <aderumier at odiso.com> wrote:
> 
> 
> I have notice something when agent daemon is down:
> 
> #qm agent 124 ping
> VM 124 qmp command 'guest-ping' failed - got timeout
> #qm agent 124 ping
> VM 124 qmp command 'guest-ping' failed - got timeout
> #qm agent 124 ping
> VM 124 qmp command 'guest-ping' failed - got timeout
> #qm agent 124 ping
> VM 124 qmp command 'guest-ping' failed - unable to connect to VM 124 qga
> socket - timeout after 11 retries
> 
> 
> Seem that after 3 request, we can't connect anymore to socket.
> (I'm seeing same thing with socat directly to qga socket)
> 
> 
> What I would like to have , to avoid big timeout (mainly for fsfreeze, this is
> the biggest with 1hour),
> is to send first a guest-ping or maybe better guest-info, with a short
> timeout.
> if it's succesfull, then send the other query.

I think that will not work. I already tried to explain why in my previous post:

The problem is that there is no way to decide if qga agent is running or not. 
You will simply run into the 'short' timeout as soon as there is some load on
the 
server.