下面讲讲如何利用Nginx的反向代理功能做一台反向代理服务器。
一、安装步骤：
（系统要求：Linux 2.6+ 内核，本文中的Linux操作系统为RedHat AS4为例）
1、获取相关源程序
wget ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.01.tar.gz
wget http://sysoev.ru/nginx/nginx-0.8.36.tar.gz
2、创建相关目录和用户
/usr/sbin/groupadd apache
/usr/sbin/useradd -g apache apache
/usr/sbin/usermod -s /sbin/nologin apache
chage -I -1 -M 99999 apache
mkdir -p /data/mp3
chmod +w /data/mp3
chown -R apache:apache /data/mp3
3、安装Nginx所需的pcre库
tar zxvf pcre-8.01.tar.gz
cd pcre-8.01/
./configure
make && make install
cd ../
4、安装Nginx
tar zxvf nginx-0.8.36.tar.gz
cd nginx-0.8.36/
./configure --user=apache --group=apache --prefix=/usr/local/nginx --with-http_stub_status_module
make && make install
cd ../
5、创建Nginx配置文件
rm -f /usr/local/nginx/conf/nginx.conf
vi /usr/local/nginx/conf/nginx.conf
输入以下内容：
user apache apache;
worker_processes 8;
error_log /dev/null crit;
pid logs/nginx.pid;
events {
use epoll;
worker_connections 512000;
}
http {
include mime.types;
default_type application/octet-stream;
log_format main '$remote_addr - $remote_user [$time_local] "$request" '
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/log/nginx_mp3.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 650;
server {
listen 80;
server_name xxx.xxx.xxx; #前端域名或IP
location ~ .*.(mp3|mid|amr)$
{
expires 15d;
root /data/mp3;
proxy_store on;
proxy_store_access user:rw group:rw all:rw;
proxy_temp_path /data/mp3;
proxy_redirect off;
proxy_set_header Host xxx.xxx.xxx ; #访问域名或ip
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size 10m;
client_body_buffer_size 1280k;
proxy_connect_timeout 900;
proxy_send_timeout 900;
proxy_read_timeout 900;
proxy_buffer_size 40k;
proxy_buffers 40 320k;
proxy_busy_buffers_size 640k;
proxy_temp_file_write_size 640k;
if ( !-e $request_filename)
{
proxy_pass http://xxx.xxx.xxx.xx/; #后端服务器ip地址
}
}
}
}
6、启动Nginx
ulimit -SHn 51200
/usr/local/nginx/sbin/nginx -t #测试配置脚本是否正确
/usr/local/nginx/sbin/nginx
二、优化Linux内核参数vi /etc/sysctl.conf
在末尾增加以下内容：
# Add
net.ipv4.tcp_max_syn_backlog = 65536
net.core.netdev_max_backlog = 32768
net.core.somaxconn = 32768
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.ip_conntrack_max = 6553600
net.ipv4.netfilter.ip_conntrack_tcp_timeout_established = 180
net.ipv4.tcp_window_scaling = 1
使配置立即生效：
/sbin/sysctl -p
三、配置开机自动启动Nginx
vi /etc/rc.local
在末尾增加以下内容：
ulimit -SHn 51200
/usr/local/nginx/sbin/nginx
另外根据需要还需设置IP地址、开放访问端口、以及访问日志的定时切割等。（全文完）