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| schestowitz | > Hi, Roy, | Mar 18 17:42 |
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| schestowitz | > | Mar 18 17:42 |
| schestowitz | > I have the packet capture file for the session below in | Mar 18 17:42 |
| schestowitz | > /var/tmp/tcpdump.2013-03-17.2254.pcap 6 minutes worth was 54MB The | Mar 18 17:42 |
| schestowitz | > script producing the output below was run at 23:00:02 UTC, but the | Mar 18 17:42 |
| schestowitz | > packet capture shows the web server still serving web pages at 22:59.9 | Mar 18 17:42 |
| schestowitz | > So it looks like there was nothing wrong with httpd or the proxy at that | Mar 18 17:42 |
| schestowitz | > time. You can look at it with tcpdump -r without being root, but I | Mar 18 17:43 |
| schestowitz | > couldn't find anything noteworthy. | Mar 18 17:43 |
| schestowitz | > | Mar 18 17:43 |
| schestowitz | > I will set tonight's to capture an extra minute to see if we can capture | Mar 18 17:43 |
| schestowitz | > the network activity at the moment httpd stops working. | Mar 18 17:43 |
| schestowitz | > | Mar 18 17:43 |
| schestowitz | > About the 3 hours outage the other day, it is puzzling why the script | Mar 18 17:43 |
| schestowitz | > was not catching that. One thing that packet capture does show is that | Mar 18 17:43 |
| schestowitz | > the curl request is going through the proxy and not hitting httpd | Mar 18 17:43 |
| schestowitz | > itself. There weren't any messages about restart attempts for that period. | Mar 18 17:43 |
| schestowitz | Thanks for helping debug this. Last night I thought there would be downtime again, but I was glad to wake up with no message in my downtimes alerts folder. THe PHP URL grabbers seem to work fine during httpd downtime (ish). Could it be a varnish proxy issue? | Mar 18 17:43 |
| schestowitz | > I think it becomes unavailable in at least two ways, one of the ways | Mar 18 18:19 |
| schestowitz | > looks like a proxy issue. That would be on the occasions when curl is | Mar 18 18:19 |
| schestowitz | > not able to retrieve a web page, but /etc/init.d/httpd status shows | Mar 18 18:19 |
| schestowitz | > the web server running. Most sites are not forthcoming with their | Mar 18 18:19 |
| schestowitz | > proxy topology, for whatever reasons. But here www.techrights.org | Mar 18 18:19 |
| schestowitz | > points to 216.105.40.123, but then requests are forwarded from | Mar 18 18:19 |
| schestowitz | > 216.105.40.99, so that's at least two links where things could break. | Mar 18 18:19 |
| schestowitz | > | Mar 18 18:19 |
| schestowitz | > The downtime at 23:00 UTC is special in that httpd goes down hard | Mar 18 18:19 |
| schestowitz | > without leaving even a goodbye in the logs. Could be PHP or something | Mar 18 18:19 |
| schestowitz | > wrong with WordPress or MediaWiki. | Mar 18 18:19 |
| schestowitz | > | Mar 18 18:19 |
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