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Instance freezing/locking up without detailing why in the logs

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linux-howto

http://serverfault.com – was hoping someone can shed some light on this reoccurring problem. We have a medium tier instance running on AWS. But it will go down a random times, normally once a week. I've spent many hours looking through access/error logs of apache trying to spot why, but it's proving to be a nightmare to diagnose. From EC2 console, the instance has a green tick icon, revealing it's running, but I can't ssh on and have to stop then start the instance for it to come back online. From the apache error logs around the time it went down earlier 127.0.0.1 - - [22/Jan/2012:06:25:03 +0000] "OPTIONS * HTTP (HowTos)