Can't Determine 504 Bad Gateway Cause

I’m getting a 504 error from Nginx.

When I look in the Nginx error.log.1, I see: “2014/01/21 18:06:02 [error] 698#0: *2 connect() failed (111: Connection refused) while connecting to upstream…”

When I try to look in the Rails production.log, the server returns “Killed”.

When I try to restart Unicorn, I get “master failed to start, check stderr log for details”.

When I run df -h I get: Filesystem Size Used Avail Use% Mounted on /dev/vda 20G 4.1G 15G 22% /

When I run ‘df -i’ I get: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/vda 1310720 144242 1166478 12% /

I tried to find a solution in chat and it was suggested I raise a ticket. Please help. Thanks!

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Please let me know if you find anything. I have this too. <br> <br>

Check unicorn’s error logs, is there anything in there?