[Users] Solved: network manager is the culprit (was: OVZ 7 network issues...)

[jjs - mainphrame]

Greetings -

It's been 2 weeks of flawless network connectivity to all containers after
completely removing network manager, even after attempts to induce the sort
of failure that were seen when network manager was running,.

At this point, it's clear that network manager was the problem, and the old
saw is confirmed: "simple is safe".

Happy new year to all who were following this question.

Joe





On Mon, Dec 14, 2015 at 9:51 AM, Konstantin Bukharov <bkb at virtuozzo.com>
wrote:

> Hello,
>
>
>
> From symptoms, it looks like ARP cache expiration issue.
>
> Please check ARP cache settings on your network equipment.
>
>
>
> We haven’t seen such massive reports.
>
>
>
> Best regards,
>
>
>
> *From:* users-bounces at openvz.org [mailto:users-bounces at openvz.org] *On
> Behalf Of *jjs - mainphrame
> *Sent:* Saturday, December 12, 2015 6:18
> *To:* users at openvz.org
> *Subject:* [Users] OVZ 7 network issues (vz host stops answering arp
> requests)
>
>
>
> Greetings,
>
>
>
> I've been running some servers in OVZ 7 containers for some months now,
> and I'm happy with reliability and performance, with the exception of an
> occasional loss of ct network connectivity.
>
> From time to time, I'll get a xymon alert that all containers are
> unreachable. The cts are all using host routing. What I see, when I examine
> any affected ct, is this:
>
>
>
>
>
> The container no longer responds to ping, even from the local lan.
>
> The vz host and container can connect to each other
>
> The container can not reach anything beyond the host.
>
>
>
> When I enter the container and ping another box, the pings are received,
> but the box can not return the pings as the arp request goes unanswered.
> For some reason the vz host forgets about the cts, and it's always all of
> them. This is 2 Centos 7 boxes, running OVZ 7 beta and OVZ 7 factory
>
>
>
> Doing a vzctl restart on each affected ct restores connectivity. Has
> anyone else seen this issue?
>
>
>
> Regards,
>
>
>
>
>
>
>
> _______________________________________________
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> Users at openvz.org
> https://lists.openvz.org/mailman/listinfo/users
>
>
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