详解nginx反向代理配置及优化

前言:

由于服务器apache抗不住目前的并发.加上前端squid配置后,问题依然无法解决.而页面程序大部分是动态.无法使用fastcgi来处理.因此想使用nginx做为反向代理apache.整个配置安装过程很简单.在考虑高并发的情况下,在安装前就做了些优化.目前配置能抗住3000以上并发.好像不是特别大哦?呵~~ 但足以~~ 只是还有少量499问题..期待有人跟我讨论解决

第1部分:安装

1 建立用户及组

/usr/sbin/groupadd www
/usr/sbin/useradd -g www www

2 安装pcre 让nginx支持rewrite 方便以后所需

wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-7.8.tar.gz
tar zxvf pcre-7.8.tar.gz
cd pcre-7.8/
./configure
make && make install

3 安装nginx

wget http://sysoev.ru/nginx/nginx-0.7.58.tar.gz
tar zxvf nginx-0.7.58.tar.gz
cd nginx-0.7.58/
./configure --user=www --group=www --prefix=/usr/local/webserver/nginx --with-http_stub_status_module --with-http_ssl_module --with-cc-opt='-o2' --with-cpu-opt=opteron
make && make install

#注意上文中的--with-cc-opt='-o2' --with-cpu-opt=opteron 这是编译器优化,目前最常用的是-02 而不是3.后面对应cpu的型号,可参照:http://wiki.gentoo.tw/index.php/howto_cflag

第2部分:配置及优化配置文件

1 nginx.conf 配置文件:

user  www www;
worker_processes 4;

# [ debug | info | notice | warn | error | crit ]
error_log  /usr/local/webserver/nginx/logs/nginx_error.log  crit;
pid        /usr/local/webserver/nginx/nginx.pid;
#specifies the value for maximum file descriptors that can be opened by this process.
worker_rlimit_nofile 51200;
events
{
     use epoll;
     worker_connections 51200;
}

http
{
     include       mime.types;
     default_type  application/octet-stream;
     source_charset gb2312;
     server_names_hash_bucket_size 256;
     client_header_buffer_size 256k;
     large_client_header_buffers 4 256k;

     #size limits
     client_max_body_size       50m;
     client_body_buffer_size    256k;
     client_header_timeout   3m;
     client_body_timeout 3m;
     send_timeout       3m;
#参数都有所调整.目的是解决代理过程中出现的一些502 499错误   
     sendfile on;
     tcp_nopush     on;
     keepalive_timeout 120; #参数加大,以解决做代理时502错误
     tcp_nodelay on;
    
     include          vhosts/upstream.conf;
     include          vhosts/bbs.linuxtone.conf; 

}

2 upstream.conf 配置文件(这也是做负载的配置方法)

upstream.conf
      upstream bbs.linuxtone.com {
         server 192.168.1.4:8099;
       }

3 站点配置文件

bbs.linuxtone.conf
server
   {
      listen       80;
      server_name  bbs.linuxtone.conf;
      charset gb2312;
      index index.html index.htm;
      root  /date/wwwroot/linuxtone/;

        location ~ ^/nginxstatus/ {
            stub_status on;
            access_log off;
         }

     location / {
       root  /date/wwwroot/linuxtone/;
       proxy_redirect off ;
       proxy_set_header host $host;
       proxy_set_header x-real-ip $remote_addr;
       proxy_set_header remote-host $remote_addr;
       proxy_set_header x-forwarded-for $proxy_add_x_forwarded_for;
       client_max_body_size 50m;
       client_body_buffer_size 256k;
       proxy_connect_timeout 30;
       proxy_send_timeout 30;
       proxy_read_timeout 60;
       proxy_buffer_size 256k;
       proxy_buffers 4 256k;
       proxy_busy_buffers_size 256k;
       proxy_temp_file_write_size 256k;
       proxy_next_upstream error timeout invalid_header http_500 http_503 http_404;
       proxy_max_temp_file_size 128m;
       proxy_pass  http://bbs.linuxtone.com;
      }

#参数都有所调整.目的是解决代理过程中出现的一些502 499错误   

#add expires header for static content
   location ~* \.(jpg|jpeg|gif|png|swf)$ {
     if (-f $request_filename) {
       root /date/wwwroot/linuxtone/;
       expires      1d;
       break;
      }
   }

     log_format  access  '$remote_addr - $remote_user [$time_local] "$request" '
                         '$status $body_bytes_sent "$http_referer" '
                         '"$http_user_agent" $http_x_forwarded_for';
    access_log  /exp/nginxlogs/bbs.linuxtone_access.log  access;
  
}

注:第二种代理方式

nginx 处理下图片,html等静态的东西.其它动态由apache处理.因此apache也需要做一些参数调整.

设置图片等过期时间.缓解请求.

如果源与nginx在同一台机器建议使用如下方法:

location / {
      proxy_pass  http://192.168.1.4:8099/;
      proxy_redirect default ;
      }

针对不同的目录进行代理把下面的配置放到根目录代理的上面

        location /linuxtone/ {
              proxy_pass  http://192.168.1.4:8099/linuxtone/;
              proxy_redirect default ;
         }

4 源配置

<virtualhost 192.168.1.4:8099>
    serveradmin liuyu105#gmail.com
    documentroot /date/wwwroot/linuxtone
    servername bbs.linuxtone.com
    errorlog logs/linuxtone_error_log
   customlog "|/usr/local/sbin/cronolog logs/linuxtone_access_log.%y%m%d" combined
</virtualhost>

 第3部分:源的优化

1 apache-mpm.conf

<ifmodule mpm_prefork_module>
    startservers          15
    minspareservers       15
    maxspareservers      30
    serverlimit         2536
    maxclients          2048
    maxrequestsperchild   1500
</ifmodule>

2 apache-keepalive

timeout 120  #与nginx的保持一至
keepalive on
maxkeepaliverequests 400
keepalivetimeout 7

第4部分:php的优化

优化一:将php由之前的xcache换成eaccelerator

1 安装

wget http://bart.eaccelerator.net/source/0.9.5.3/eaccelerator-0.9.5.3.tar.bz2
tar jxvf eaccelerator-0.9.5.3.tar.bz2
cd eaccelerator-0.9.5.3/
/usr/local/webserver/php/bin/phpize
./configure --enable-eaccelerator=shared --with-php-config=/usr/local/php5/bin/php-config
make
make install

注:php路径以安装为准!

2 配置

sed -i 's#extension_dir = "./"#extension_dir = "/usr/local/php5/lib/php/extensions/no-debug-non-zts-20060613/"\nextension = "memcache.so"\n#' /etc/php.ini
sed -i 's#output_buffering = off#output_buffering = on#' /etc/php.ini
sed -i "s#; always_populate_raw_post_data = on#always_populate_raw_post_data = on#g" /etc/php.ini

配置eaccelerator加速php：

mkdir -p /usr/local/webserver/eaccelerator_cache
vi /etc/php.ini

按shift+g键跳到配置文件的最末尾，加上以下配置信息：

[eaccelerator]
zend_extension="/usr/local/php5/lib/php/extensions/no-debug-non-zts-20060613/eaccelerator.so"
eaccelerator.shm_size="128"
eaccelerator.cache_dir="/usr/local/webserver/eaccelerator_cache"
eaccelerator.enable="1"
eaccelerator.optimizer="1"
eaccelerator.check_mtime="1"
eaccelerator.debug="0"
eaccelerator.filter=""
eaccelerator.shm_max="0"
eaccelerator.shm_ttl="300"
eaccelerator.shm_prune_period="120"
eaccelerator.shm_only="0"
eaccelerator.compress="1"
eaccelerator.compress_level="9"

优化二:联系开发重新编译php减少php的模块.以减少php进程所占用内存数.这块尽管影响不大,但也有一定的作用.编译前也可以参照nginx的编译器优化方式安装.

第5部分:测试并启动nginx

ulimit -shn 51200
/usr/local/webserver/nginx/sbin/nginx -t 
/usr/local/webserver/nginx/sbin/nginx

第6部分:nginx日志切割脚本

#!/bin/bash
# this script run at 00:00

# the nginx logs path
logs_path="/exp/nginxlogs/"

mkdir -p ${logs_path}$(date -d "yesterday" +"%y")/$(date -d "yesterday" +"%m")/
mv ${logs_path}bbs.linuxtone_access.log ${logs_path}$(date -d "yesterday" +"%y")/$(date -d "yesterday" +"%m")/bbs.linuxtone_access_$(date -d "yesterday" +"%y%m%d").log
kill -usr1 `cat /usr/local/webserver/nginx/nginx.pid`

crontab -e

00 00 * * * /bin/bash    /usr/local/webserver/nginx/sbin/cut_nginx_log.sh

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。