Amazon EC2 Web server in Load Balancer gives 503

Posted by dale on Server Fault See other posts from Server Fault or by dale
Published on 2014-06-05T20:20:31Z Indexed on 2014/06/05 21:27 UTC
Read the original article Hit count: 217

Filed under:

nginx

|

amazon-ec2

|

load-balancing

we've been running our web servers at Amazon with load balancer and auto-scaling for over a year with no problem. All of a sudden today the request began to get aborted with the error: 503 ... Backend server is at capacity

The web servers are at 1% CPU and no other alarms trigger.

We use Amazons load balancer and nginx.

Lots of requests like this are showing up in the access_log.

10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-"
10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-"
10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-"
10.246.114.93 - - [05/Jun/2014:20:16:09 +0000] "-" 400 0 "-" "-"
10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-"
10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-"
10.246.114.93 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-"
10.229.15.214 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-"
10.229.15.214 - - [05/Jun/2014:20:16:10 +0000] "-" 400 0 "-" "-"

Any thoughts?

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