安装 Nginx 配置负载均衡

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安装 Nginx 配置负载均衡

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先安装：

wget http://sysoev.ru/nginx/nginx-0.6.35.tar.gz
tar zxvf nginx-0.6.35.tar.gz
cd nginx-0.6.35
./configure
make
make install

wget http://sysoev.ru/nginx/nginx-0.6.35.tar.gz
tar zxvf nginx-0.6.35.tar.gz
cd nginx-0.6.35
./configure
make
make install

安装时出现下面的错误：

Configuration summary
+ PCRE library is not found
+ OpenSSL library is not used
+ md5 library is not used
+ sha1 library is not used
+ using system zlib library

./configure: error: the HTTP rewrite module requires the PCRE library.
You can either disable the module by using --without-http_rewrite_module
option, or install the PCRE library into the system, or build the PCRE library
statically from the source with nginx by using --with-pcre= option.

说没有 PCRE 库，那安装它：

yum install pcre-devel

yum install pcre-devel

安装完后，修改配置vi conf/nginx.conf，修改后看起来像：

user chenlb;
worker_processes 10;
#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 1024;
}
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 logs/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
upstream demo {
server 172.0.0.1:8080 weight=1;
server 192.168.1.100:8080 weight=1;
}
server {
listen 80;
server_name nobody.chenlb.com;
#charset koi8-r;
log_format nobody_chenlb_com '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" "$http_x_forwarded_for"';
access_log logs/access.log nobody_chenlb_com;
location / {
proxy_pass http://demo;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
}
}

user  chenlb;
worker_processes  10;

#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  1024;
}

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  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    upstream demo {
        server 172.0.0.1:8080 weight=1;
        server 192.168.1.100:8080 weight=1;

    }

    server {
        listen       80;
        server_name  nobody.chenlb.com;

        #charset koi8-r;

        log_format  nobody_chenlb_com  '$remote_addr - $remote_user [$time_local] $request '
                      '"$status" $body_bytes_sent "$http_referer" "$http_x_forwarded_for"';

        access_log  logs/access.log  nobody_chenlb_com;

        location / {
            proxy_pass http://demo;
            proxy_set_header   Host             $host;
            proxy_set_header   X-Real-IP        $remote_addr;
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
        }
    }

}

修改浏览器所在机子hosts，nobody.chenlb.com 指向到nginx所在机子。

jsp的测试页面，nginx-test.jsp：

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ page import="java.util.LinkedHashMap" %>
<%@ page import="java.util.Enumeration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>nginx demo</title>
</head>
<body>
<%
LinkedHashMap map = new LinkedHashMap();
map.put("getServerName", request.getServerName());
map.put("getServerPort", request.getServerPort());
map.put("getRemoteAddr", request.getRemoteAddr());
map.put("getRemoteHost", request.getRemoteHost());
map.put("getRemotePort", request.getRemotePort());
map.put("getLocalName", request.getLocalName());
map.put("getLocalAddr", request.getLocalAddr());
map.put("getLocalPort", request.getLocalPort());
//HttpServletRequest req = (HttpServletRequest)request;
for (Enumeration e = request.getHeaderNames() ; e.hasMoreElements() ;) {
Object obj = e.nextElement();
map.put(obj.toString(), request.getHeader(obj.toString()));
}
%>
<table border=1>
<tr><th>name</th><th>value</th></tr>
<%
for(Object key : map.keySet()) {
out.println("<tr><th>");
out.println(key+"</th><th>"+map.get(key)+"</th></tr>");
}
String str = request.getContextPath()+request.getServletPath()+(request.getPathInfo()==null?"":request.getPathInfo())+(request.getQueryString() == null ? "" : "?"+request.getQueryString());
System.out.println(str);
%>
</table>
</body>
</html>

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ page import="java.util.LinkedHashMap" %>
<%@ page import="java.util.Enumeration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>nginx demo</title>
</head>
<body>
<%
LinkedHashMap map = new LinkedHashMap();
map.put("getServerName", request.getServerName());
map.put("getServerPort", request.getServerPort());
map.put("getRemoteAddr", request.getRemoteAddr());
map.put("getRemoteHost", request.getRemoteHost());
map.put("getRemotePort", request.getRemotePort());

map.put("getLocalName", request.getLocalName());
map.put("getLocalAddr", request.getLocalAddr());
map.put("getLocalPort", request.getLocalPort());
//HttpServletRequest req = (HttpServletRequest)request;
for (Enumeration e = request.getHeaderNames() ; e.hasMoreElements() ;) {
	Object obj = e.nextElement();
	map.put(obj.toString(), request.getHeader(obj.toString()));
}
%>
<table border=1>
<tr><th>name</th><th>value</th></tr>
<%

for(Object key : map.keySet()) {
	out.println("<tr><th>");
	out.println(key+"</th><th>"+map.get(key)+"</th></tr>");
}

String str = request.getContextPath()+request.getServletPath()+(request.getPathInfo()==null?"":request.getPathInfo())+(request.getQueryString() == null ? "" : "?"+request.getQueryString());
System.out.println(str);
%>
</table>
</body>
</html>

分别在172.0.0.1:8080、192.168.1.100:8080的web实例下放入nginx-test.jsp。

启动nginx：

sbin/nginx

sbin/nginx

在浏览器中访问：http://nobody.chenlb.com/demo/nginx-test.jsp，出现了一个问题，一时快，一时很慢，看到nginx在域名查找，后来把upstream的demo在nginx那台机子的hosts配上IP就好。

参考：http://blog.s135.com/post/306/ ，http://wiki.nginx.org/NginxChsLoadBalanceExample

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