<div dir="ltr">Greetings,<div><br></div><div>I'm not sure if my openvz issues are baffling everyone, or merely boring them.</div><div><br></div><div>I've made a configuration change which should provide additional data when the next network outage occurs. I removed the venet IP from one CT and added a physical ethernet device, which is now configured with the IP which was formerly host routed. I'm interested to see if this CT remains connected when the next failure occurs with the host routed IP in the other CT. </div><div><br></div><div>I'll report what I find.</div><div><br></div><div>Regards,</div><div><br></div><div>Joe</div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Dec 14, 2015 at 10:27 AM, jjs - mainphrame <span dir="ltr"><<a href="mailto:jjs@mainphrame.com" target="_blank">jjs@mainphrame.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Thank you for the sanity check. It does act like an arp cache expiration issue.<div><br></div><div>But what is puzzling to me is that in my humble setup here there is not much in the way of network equipment. The only components here in my office are a few x86_64 boxes and a low end, unmanaged 8 port Trendnet switch. </div><div><br></div><div> As a reference points, VZ servers were in production 24-7 at the company I left in 2013, and there was never any such outage in any of the dozens of VEs in the 3 years I was there.</div><div><br></div><div>I have seen discussions about a loss of kvm connectivity through centos hosts, so this is looking like it might be related.<br></div><div><br>I'll have to wait some days or weeks for the next failure and then try to gather more info. <br><br>Regards,</div><div><br></div><div>Joe</div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On Mon, Dec 14, 2015 at 9:51 AM, Konstantin Bukharov <span dir="ltr"><<a href="mailto:bkb@virtuozzo.com" target="_blank">bkb@virtuozzo.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div lang="EN-US" link="#0563C1" vlink="#954F72"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Hello,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">From symptoms, it looks like ARP cache expiration issue.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Please check ARP cache settings on your network equipment.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">We haven’t seen such massive reports.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d">Best regards, <u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> <a href="mailto:users-bounces@openvz.org" target="_blank">users-bounces@openvz.org</a> [mailto:<a href="mailto:users-bounces@openvz.org" target="_blank">users-bounces@openvz.org</a>] <b>On Behalf Of </b>jjs - mainphrame<br><b>Sent:</b> Saturday, December </span><span lang="RU" style="font-size:11.0pt;font-family:"Calibri",sans-serif">12, 2015 6:18<br><b>To:</b> <a href="mailto:users@openvz.org" target="_blank">users@openvz.org</a><br><b>Subject:</b> [Users] OVZ 7 network issues (vz host stops answering arp requests)<u></u><u></u></span></p><div><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">Greetings, <u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">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.<br><br>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:<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">The container no longer responds to ping, even from the local lan.<u></u><u></u></p></div><div><p class="MsoNormal">The vz host and container can connect to each other <u></u><u></u></p></div><div><p class="MsoNormal">The container can not reach anything beyond the host.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">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<u></u><u></u></p></div></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Doing a vzctl restart on each affected ct restores connectivity. Has anyone else seen this issue?<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Regards,<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div></div></div></div></div></div><br></div></div>_______________________________________________<br>
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