压力测试后，解决NGINX + CAS双机负载问题

原生CAS, 在loadrunner 500并发下，表现良好，但集成了NGINX后出现的瓶颈。

下面是对NGINX的配置，解决问题：

#
upstream cas_server {
server 192.168.XX.35:8880 max_fails=3 fail_timeout=3s weight=9;
server 192.168.XX.67:8080 max_fails=3 fail_timeout=3s weight=9;

#keepalive 16;
keepalive 128;
}

server {
listen 80;
server_name localhost;

location /cas {
access_log logs/oacas.XXX.com-casserver_acc.log main;
error_log logs/oacas.XXX-casserver_err.log warn;
client_body_buffer_size 128k;
proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_connect_timeout 120; #60
proxy_send_timeout 60;
proxy_read_timeout 120;
proxy_buffer_size 32k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;
proxy_next_upstream error timeout invalid_header http_500 http_503 http_404;
proxy_pass http://cas_server;
proxy_http_version 1.1;
proxy_set_header Connection "";

}

}