使用nginx负载均衡，webbench做压力测试出现的问题，求助

WindySky 2016-04-13

展开全文

nginx 负载均衡压力测试并发 session

台式机配置：双核4G内存
VM开了三个虚拟机：一个做nginx服务器，设memory1G，ip:10.10.21.134;两个做web服务器，使用的是自己装的Q2A网站，memory都是1G，ip分别为：10.10.21.135,10.10.21.138
nginx.conf主要内容：
worker_processes  2;
events {
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    keepalive_timeout  65;
#均衡
upstream webservers{
server 10.10.21.135 max_fails=3 fail_timeout=1s weight=1;
  server 10.10.21.138  max_fails=3 fail_timeout=1s weight=1;
server 127.0.0.1:8080 backup;
#缓存
proxy_cache_path /nginx/cache/first levels=1:2:1 keys_zone=a:20m max_size=1g;
server {
        listen       80;
        server_name  localhost;
location / {
         proxy_pass http://webservers/;
        proxy_set_header X-Real-IP $remote_addr;
    proxy_connect_timeout 300;
proxy_read_timeout 300;
proxy_send_timeout 300;
        proxy_cache a;
#js与css请求
  location ~.*\.(gif|jpg|jpeg|png|bmp|swf|css|js)$
        {
     proxy_pass http://10.10.21.135;
      }
        }
}

apache2.conf的最主要配置：
Timeout 300
KeepAlive On
MaxKeepAliveRequests 100
KeepAliveTimeout 15
<IfModule mpm_prefork_module>
     StartServers          5
    MinSpareServers       5
    MaxSpareServers      6
    ServerLimit         550
    MaxClients          500
MaxRequestsPerChild   10000
</IfModule>
HostnameLookups Off

使用webbench做测试时，60S并发1000时基本均衡，漏掉的请求也不是很多，60S并发1500做测试时，使用grep 'GET /' /var/log/nginx/access.log | grep '15/Sep/2014:19'|wc -l  命令对access.log做计算时结果如下：
nginx服务器：

两个web：

结果漏了很多请求

error.log内容：
nginx：2014/09/15 19:30:04 [error] 29561#0: *7668 connect() failed (110: Connection timed out) while connecting to upstream, client: 10.10.21.137, server: localhost, request: "GET / HTTP/1.0", upstream: "http://10.10.21.135:80/", host: "10.10.21.134"
135服务器：
[error] [client 10.10.21.134] PHP Notice: session_start(): ps_files_cleanup_dir: opendir(/var/lib/php5) failed: Permission denied (13) in /var/www/question2answer/qa-include/qa-app-users.php on line 150
138服务器：
[error] [client 10.10.21.134] request failed: error reading the headers

难道这就是极限了吗？还是我的配置数据有问题啊？
怎样优化nginx的配置呢？
寻求这位的帮助~~

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