说明:
Nginx负载均衡服务器：
系统：CentOS 5.5
IP：192.168.21.164
Web服务器列表：
Web1:192.168.21.160
Web2:192.168.21.169
实现目的：
用户访问192.168.21.164服务器时，通过Nginx负载均衡到Web1和Web2服务器
准备篇：
一、配置防火墙，开启80端口
vim /etc/sysconfig/iptables #编辑防火墙配置文件,添加以下内容
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
/etc/init.d/iptables restart #最后重启防火墙使配置生效
二、关闭SELINUX
vim /etc/selinux/config #编辑配置文件
#SELINUX=enforcing #注释掉
#SELINUXTYPE=targeted #注释掉
SELINUX=disabled #增加
:wq #保存
shutdown -r now #重启系统
三、系统约定
软件源代码包存放位置：/usr/local/src
源码包编译安装位置：/usr/local/软件名字
四、下载软件包
1、下载nginx（目前稳定版）
http://nginx.org/download/nginx-1.0.15.tar.gz
2、下载pcre （支持nginx伪静态）
ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/pcre-8.30.tar.gz
3、下载ngx_cache_purge（清除指定URL缓存，方便以后扩展配置nginx缓存服务器）
http://labs.frickle.com/files/ngx_cache_purge-1.5.tar.gz
五、安装编译工具及库文件（使用CentOS yum命令安装，安装的包比较多，方便以后配置lnmp环境）
yum install make apr* autoconf automake curl curl-devel gcc gcc-c++ zlib-devel openssl openssl-devel pcre-devel gd kernel keyutils patch perl kernel-headers compat* cpp glibc libgomp libstdc++-devel keyutils-libs-devel libsepol-devel libselinux-devel krb5-devel zlib-devel libXpm* freetype libjpeg* libpng* php-common php-gd ncurses* libtool* libxml2 libxml2-devel patch
安装篇
1、安装pcre
cd /usr/local/src
mkdir /usr/local/pcre #创建安装目录
tar zxvf pcre-8.30.tar.gz
cd pcre-8.30
./configure --prefix=/usr/local/pcre #配置
make
make install
2、安装nginx
groupadd www #添加www组
useradd -g www www -s /bin/false #创建nginx运行账户www并加入到www组，不允许www用户直接登录系统cd /usr/local/src #进入安装目录
tar zxvf ngx_cache_purge-1.5.tar.gz #解压
tar zxvf nginx-1.0.15.tar.gz #解压
cd nginx-1.0.15
./configure --prefix=/usr/local/nginx --without-http_memcached_module
--user=www --group=www --with-http_stub_status_module --with-openssl=/usr/ --with-pcre=/usr/local/src/pcre-8.30 --add-module=../ngx_cache_purge-1.5 #配置
make
make install
/usr/local/nginx/sbin/nginx #启动Nginx
注意:--with-pcre=/usr/local/src/pcre-8.30指向的是源码包解压的路径，而不是安装的路径，否则会报错
3、设置nginx开启启动
vim /etc/rc.d/init.d/nginx #编辑启动文件添加下面内容
#!/bin/bash
# nginx Startup script for the Nginx HTTP Server
# it is v.0.0.2 version.
# chkconfig: - 85 15
# description: Nginx is a high-performance web and proxy server.
# It has a lot of features, but it's not for everyone.
# processname: nginx
# pidfile: /var/run/nginx.pid
# config: /usr/local/nginx/conf/nginx.conf
nginxd=/usr/local/nginx/sbin/nginx
nginx_config=/usr/local/nginx/conf/nginx.conf
nginx_pid=/usr/local/nginx/logs/nginx.pid
RETVAL=0
prog="nginx"
# Source function library.
. /etc/rc.d/init.d/functions
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
[ -x $nginxd ] || exit 0
# Start nginx daemons functions.
start() {
if [ -e $nginx_pid ];then
echo "nginx already running...."
exit 1
fi
echo -n $"Starting $prog: "
daemon $nginxd -c ${nginx_config}
RETVAL=$?
echo
[ $RETVAL = 0 ] && touch /var/lock/subsys/nginx
return $RETVAL
}
# Stop nginx daemons functions.
stop() {
echo -n $"Stopping $prog: "
killproc $nginxd
RETVAL=$?
echo
[ $RETVAL = 0 ] && rm -f /var/lock/subsys/nginx /usr/local/nginx/logs/nginx.pid
}
reload() {
echo -n $"Reloading $prog: "
#kill -HUP `cat ${nginx_pid}`
killproc $nginxd -HUP
RETVAL=$?
echo
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
reload)
reload
;;
restart)
stop
start
;;
status)
status $prog
RETVAL=$?
;;
*)
echo $"Usage: $prog {start|stop|restart|reload|status|help}"
exit 1
esac
exit $RETVAL
:wq! #保存退出
chmod 775 /etc/rc.d/init.d/nginx #赋予文件执行权限
chkconfig nginx on #设置开机启动
/etc/rc.d/init.d/nginx restart #重启Nginx
配置篇
配置Nginx
cp /usr/local/nginx/conf/nginx.conf /usr/local/nginx/conf/nginx.confbak #备份nginx配置文件
（一）、设置nginx运行账号
vim /usr/local/nginx/conf/nginx.conf #编辑
找到user nobody;修改为user www www; 在第一行
（二）、禁止nginx空主机头
vim /usr/local/nginx/conf/nginx.conf #编辑
找到server，在上面一行添加如下内容：
server {
listen 80 default;
server_name _;
location / {
root html;
return 404;
}
location ~ /.ht {
deny all;
}
}
/etc/rc.d/init.d/nginx restart #重启nginx
这样设置之后，空主机头访问会直接跳转到nginx404错误页面。
（三）、添加nginx虚拟主机包含文件
cd /usr/local/nginx/conf/ #进入nginx安装目录
mkdir vhost #建立虚拟目录
vi /usr/local/nginx/conf/nginx.conf #编辑
找到上一步添加的代码，在最后添加如下内容：include vhost/*.conf;
server {
listen 80 default;
server_name _;
location / {
root html;
return 404;
}
location ~ /.ht {
deny all;
}
}
include vhost/*.conf; #添加这行
（四）、添加Web服务器列表文件
cd /usr/local/nginx/conf/ #进入目录
touch mysvrhost.conf #建立文件
vi /usr/local/nginx/conf/nginx.conf #编辑
#找到上一步添加的代码，在下面添加一行
include mysvrhost.conf;
（五）、设置nginx全局参数
vi /usr/local/nginx/conf/nginx.conf #编辑
worker_processes 2; # 工作进程数,为CPU的核心数或者两倍
events
{
use epoll; #增加
worker_connections 65535; #修改为65535，最大连接数。
}
以下代码在http { 部分增加与修改
server_names_hash_bucket_size 128; #增加
client_header_buffer_size 32k; #增加
large_client_header_buffers 4 32k; #增加
client_max_body_size 300m; #增加
tcp_nopush on; #修改为on
keepalive_timeout 60; #修改为60
tcp_nodelay on; #增加
server_tokens off; #增加，不显示nginx版本信息
gzip on; #修改为on
gzip_min_length 1k; #增加
gzip_buffers 4 16k; #增加
gzip_http_version 1.1; #增加
gzip_comp_level 2; #增加
gzip_types text/plain application/x-javascript text/css application/xml; #增加
gzip_vary on; #增加
（六）、设置Web服务器列表
cd /usr/local/nginx/conf/ #进入目录
vi mysvrhost.conf #编辑，添加以下代码
upstream osyunweihost {
server 192.168.21.160:80 weight=1 max_fails=2 fail_timeout=30s;
server 192.168.21.169:80 weight=1 max_fails=2 fail_timeout=30s;
ip_hash;
}
（七）、新建虚拟主机配置文件
cd /usr/local/nginx/conf/vhost #进入虚拟主机目录
touch osyunwei.conf #建立虚拟主机配置文件
vi osyunwei.conf #编辑
server
{
listen 80;
server_name [www.osyunwei.com](http://www.osyunwei.com/) bbs.osyunwei.com sns.osyunwei.com;
location /
{
proxy_next_upstream http_502 http_504 error timeout invalid_header;
proxy_pass http://osyunweihost;
#proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
log_format access '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /usr/local/nginx/logs/access.log access;
location /NginxStatus {
stub_status on;
access_log on;
auth_basic "NginxStatus";
#auth_basic_user_file pwd;
}
}
:wq! #保存配置 service nginx restart #重启nginx
至此，Nginx负载均衡服务器配置教程完成
相关配置文件
1、/usr/local/nginx/conf/nginx.conf
user www www;
worker_processes 2;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
events {
use epoll;
worker_connections 65535;
}
http {
include mysvrhost.conf;
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 logs/access.log main;
server_names_hash_bucket_size 128;
client_header_buffer_size 32k;
large_client_header_buffers 4 32k;
client_max_body_size 300m;
sendfile on;
tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 60;
tcp_nodelay on;
server_tokens off;
gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.1;
gzip_comp_level 2;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;
server {
listen 80 default;
server_name _;
location / {
root html;
return 404;
}
location ~ /.ht {
deny all;
}
}
include vhost/*.conf;
}
/usr/local/nginx/conf/mysvrhost.conf
upstream osyunweihost {
server 192.168.21.160:80 weight=1 max_fails=2 fail_timeout=30s;
server 192.168.21.169:80 weight=1 max_fails=2 fail_timeout=30s;
ip_hash;
}
/usr/local/nginx/conf/vhost/osyunwei.conf
server
{
listen 80;
server_name bbs.osyunwei.com sns.osyunwei.com;
location /
{
proxy_next_upstream http_502 http_504 error timeout invalid_header;
proxy_pass http://osyunweihost;
#proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $remote_addr;
}
log_format access '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /usr/local/nginx/logs/access.log access;
location /NginxStatus {
stub_status on;
access_log on;
auth_basic "NginxStatus";
#auth_basic_user_file pwd;
}
}
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