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This afternoon I noticed that a manually started service is no longer running on my EC2 instance (standard Ubuntu 9.04 image). When I logged in via SSH I got warning that rsa fingerprint of the host has changed. Uptime was 7 hours and from /var/log/messages I could see that the VM had rebooted this morning. Looked at the dates of files in /etc/ssh, they were all last modified this morning too.

I'm not very familiar with EC2 instances so wanted to ask -- is this behavior normal, what could cause it? Some automatic security updates maybe?

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If I remember correctly from testing, default ubuntu image on EC2 generates it's ssh indetity key on every reboot.

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That's screwed up. – Tobu Jul 1 '10 at 23:10

I observed one of my EC2 VMs reboot for no apparent reason on June 30, 2010.

The only information I've found so far is:쳁

Posted: Jan 23, 2007 4:15 AM PST

We're investigating an open issue that is causing intermittent reboots under certain types of workloads. In the interim we're working to try to isolate customers who have historically exhibited these kinds of workloads.

Reboots should be expected, but no more frequently than you'd expect them with commodity hardware.

(emphasis mine)

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