Over the past week I've migrated a blog from a shared host to a VPS.NET 2 node VPS running the Turnkey Linux WordPress image. In general it seems to be running ok. (http://www.mgraves.org)
However, several times I've seen the CPU load spike up to 15 nodes! When this happens the site drops offline. It's unresponsive to any kind of connection; web, web admin, ssh, etc.
When I find the site in this state it will not respond to a graceful reboot of the VPS. I can only force a power-down, the a bit a bit and bring it back up.
When it comes back up it runs normally for a day or more, but it eventually encounters the CPU spike again.
Having just migrated from a shared host I'm not clear where to look in the TKL setup to determine if the problem is being caused by a local process or something else?
Any suggestion for which logs might reveal what's going on?