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my applications were down but servers were running good

Posted on November 23, 2015

Hi, my current stack is on CentOS 6.4, NGINX with Passenger, Postgresql, Redis and Rails. It has been happened today, during EST 1:22AM to 1:25AM, all of my server reported ping down, but I had active SSH sessions running from Putty. the failed ping also leads to my websites/application downtime for that 5 minutes.

Did Digitalocean had a network maintenance during the given period, on 23rd November? if not, how can I find out the exact reason about this?

My postgres server makes a dump every 2 hours, so it is not supposed to do any harm, otherwise I would have sites down every 2 hours always or frequently.

I need some detailed help on how to find out the issues, specially what logs to check or what status to check. Kindly help.

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