[Users] OVZ 7 network issues (vz host stops answering arp requests)

[Konstantin Bukharov]

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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