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Re: 4.11.0 -> 4.11.1 problem: Guest VMs losing connection after few minutes


Have you tried destroying router vm and let CloudStack create new one ?

On Fri, Jul 20, 2018 at 1:33 AM Jevgeni Zolotarjov <j.zolotarjov@xxxxxxxxx>
wrote:

> - an ip-address conflict.
>   JZ: unlikely, but not impossible. I tried to restart router VM in
> Network-Guest networks -> defaultGuestNetwork -> VirtualAppliances
> While rebooting ping to this router VM disappeared. Hence, no other device
> is using the same IP.
> But!!! when this virtual router started, then network connection to all
> guest VMs disappeared. So, it must be something with this virtual router.
>
> - flakey hardware being one of
> -+ if card in the host
> JZ: higly unlikely
>
> -+ a router with bad firmware
> JZ: also unlikely
>
> - of course a strange cofiguration of the software router in you host might
> be the issue as well
> JZ: I didnt do any special configuration. Just used default.
>
> by all I know this happening after upgrade sounds like an unhappy incident
> but can't be sure.
> The iptables restart, was this on the VirtualRouter or on the host, or
> maybe on the guest? and the restart network?
>
> JZ: iptables restart on host machine. (or network restart on host)
>
>
>
> On Fri, Jul 20, 2018 at 11:14 AM Daan Hoogland <daan.hoogland@xxxxxxxxx>
> wrote:
>
> > that behaviour sound familiar from a couple of cases:
> > - an ip-address conflict.
> > - flakey hardware being one of
> > -+ if card in the host
> > -+ a router with bad firmware
> > - of course a strange cofiguration of the software router in you host
> might
> > be the issue as well
> >
> > by all I know this happening after upgrade sounds like an unhappy
> incident
> > but can't be sure.
> > The iptables restart, was this on the VirtualRouter or on the host, or
> > maybe on the guest? and the restart network?
> >
> >
> > On Fri, Jul 20, 2018 at 7:43 AM, Jevgeni Zolotarjov <
> > j.zolotarjov@xxxxxxxxx>
> > wrote:
> >
> > > I updated cloudstack 4.11.0 -> 4.11.1
> > >
> > > Everything went OK during update, but after host reboot guest VMs lost
> > > connection after few minutes of normal work.
> > > I tried restarting network - systemctl restart network.service
> > > then connection was restored again for few minutes
> > >
> > > Finally I could restore connection by restarting iptables - systemctl
> > > restart iptables.service
> > >
> > > But then again guest VMs lost connection after few minutes of normal
> > > operation.
> > > The time of normal operation can be 5 minutes, but sometimes up to 40
> > > minutes.
> > >
> > > Please help me to track the root cause and fix it
> > >
> > > Host OS - Centos 7.5
> > > virtualisation - KVM
> > >
> >
> >
> >
> > --
> > Daan
> >
>