round robin upstream stuck

Zhang,Tony tzhang at
Thu Jun 11 13:42:15 MSD 2009


         I got some but not that much errer log in error.log like :
round robin upstream stuck on 1 tries while connecting to upstream, client: xxxx , server: xxxx, request: "GET xxxx”

         I tuned log level to critical, it appears every 10 , 20 or 30 mins, I am using upstream module for load balancing with about 10000+ established connection.
         Does it mean that my frontend servers are overloaded or the backend servers/VIP response is too slow?

my “frontend server” directives looks like :
proxy_connect_timeout 10s;
                proxy_send_timeout 10s;
                proxy_read_timeout 10s;
                proxy_next_upstream timeout;

         and my “upstream “ directives looks like:
upstream {
                                    backend server xxxx:80 ;
                                    backend server xxxxx:80 ;


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