<div dir="ltr">Greetings -<div><br></div><div>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,.</div><div><br></div><div>At this point, it's clear that network manager was the problem, and the old saw is confirmed: "simple is safe".</div><div><br></div><div>Happy new year to all who were following this question.</div><div><br></div><div>Joe</div><div><br></div><div><br></div><div><br></div><div><br></div><div class="gmail_extra"><br><div class="gmail_quote">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><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><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 class="h5"><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>_______________________________________________<br>
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