Hello, I've found that when there are upstream servers unavailable in my upstream group, applying a little bit of load on the server (i.e., just myself browsing around quickly, 2-3 req/s max) results in the following errors even for upstream servers that are available and well:
2013/04/04 22:02:21 [error] 4211#0: *2898 writev() failed (134: Transport endpoint is not connected) while sending request to upstream, client: 184.94.54.70, server: , request: "GET /api/ui/skin HTTP/1.1", upstream: "http://10.112.5.119:2001/api/ui/skin";, host: "mysite.org", referrer: "http://mysite.org/search"; In this particular example, I have 4 upstreams, 3 servers are shut down (all except 10.112.5.119). If I comment out the 3 other upstream servers, I cannot reproduce this error. Running SmartOS (Joyent cloud) $ nginx -v nginx version: nginx/1.3.14 These are things I tried to no avail: * I used to have keepalive 64 on the upstream, I removed it * Nginx used to run as a non-privileged user, I switched it to root (prctl reports that privileged users should have 65,000 nofiles allowed) * I used to have worker_processes set to 5, I increased it to 16 * The upstream server configuration used to not have max_fails *or* max_timeout, I added those in trying to limit the amount of times nginx tried to access the downed upstream servers * I used to have the proxy_connect_timeout unspecified so it should have defaulted to 60s, I tried setting it to 1s * I tried commenting out all the rate-limiting directives The URLs I'm hitting in my tests are all those for the "tenantworkers" upstream. Any idea? I would think I probably have a resource limit issue, or an issue with the back-end server, but it just doesn't make sense that everything is OK after I comment out the downed upstreams. My concern is that the system will crumble under real load when even 1 upstream becomes unavailable. Thanks, Branden
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