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I'm hosting with MediaTemple on a (dv) Dedicated-Virtual 3.5 server. My site consists of a Wordpress blog, some custom PHP pages (nothing too intense), and I server 500-700 unique visitors per day.

Despite my pretty modest numbers, I suffer from regular Apache crashes on account of QoS Alerts, mostly flagged as "tcpsndbuf".

MediaTemple support -- usually tops -- has been pretty useless on this matter. I'm looking for answers as to how/why this is happening, advice on how to stop it. My website is a good portion of my livelihood, and downtime equates to lost income.

Any and all help much appreciated.

-Matt

4 Answers4

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"tcpsndbuf" errors usually have to do with low memory. Have you looked over your error logs for clues as to what is happening?

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Hey I'm actually having this problem on one of my sites as well. The tcpsndbuf, from what the MT rep is telling me seems to be spiking over 100%, which then makes Apache stop taking connections.

This then has to be rectified by restarting the server.

Watching the access log and tops from ssh is pretty useless, since it could really be any of page.

Also, this problems seems to be happening every month.

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Do the crashes happen at the same time every day or multiple times per day?

Perhaps you're running some kind of scheduled clean up job that is using up all the memory.

David
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Band-Aid: Install Monit, to monitor your server's services and monit will restart them automatically if it fails. Look through MT's knowledgebase on how to install YUM on your server. Then search on google on "How to install Monit with YUM".

And Cache your site to hell as much as you can.

My real suggestion would be to recommend a different host, I had the same issues as you listed with MT until I took the big move to another vps provider.