nginx+tomcat整合负载均衡

nginx现在十分流行，一直想做个nginx负载均衡，体验一下真实的环境，碰巧最近项目需要正好搭建这个环境：

我是用一个nginx服务器转发请求到两个tomcat上，具体环境：

os：centos5.5 ，?nginx-0.7.44，?pcre-8.10，apache-tomcat-7.0.5

IP地址分配如下：

nginx server：192.168.2.220

tomcat server1 192.168.2.202

tomcat server2 192.168.2.203

一，具体操作步骤：(在192.168.2.220上)

1，安装pcre

#tar zxvf pcre-8.10.tar.gz

#cd pcre-8.10

#make#make install

2,安装??nginx-0.7.44

#tar zxvf ??nginx-0.7.44.tar.gz

#cd ??nginx-0.7.44

#?./configure --with-http_stub_status_module --with-http_ssl_module --prefix=/usr/local/nginx

#make && make install

注：安装过程中可能会有错误，一般就是库文件没有装，建议用yum -y install filename

2,测试nginx安装是否成功：

#/usr/local/nginx/sbin/nginx -t

如果出现如下信息说明安装成功：

# /usr/local/nginx/sbin/nginx -t
2010/12/04 21:36:15 [info] 3620#0: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
2010/12/04 21:36:15 [info] 3620#0: the configuration file /usr/local/nginx/conf/nginx.conf was tested successfully

3，修改nginx配置文件：

?user www www;
worker_processes 10;
#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;
#pid logs/nginx.pid;
#最大文件描述符
worker_rlimit_nofile 51200;
events
{
use epoll;
worker_connections 51200;
}
http
{
include mime.types;
default_type application/octet-stream;
keepalive_timeout 120;
tcp_nodelay on;
upstream servers {
server 192.168.2.202:8080;
server 192.168.2.203:8080;
}
server
{
listen 80;
server_name 192.168.2.220;
location /
{
proxy_pass  http://servers;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
}
log_format 192.168.2.220 '$remote_addr - $remote_user [$time_local] $request '
'"$status" $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';
access_log /var/logs/access.log ;
location /NginxStatus {
stub_status on;
access_log on;
auth_basic "NginxStatus";
# auth_basic_user_file htpasswd;
}
}
}

二，安装tomcat，分别在192.168.2.202/192.168.2.203进行如下操作：

1，安装jdk，

#cd /usr/local

#chmod +x jdk-6u22-linux-i586-rpm.bin

#./?jdk-6u22-linux-i586-rpm.bin

# rm -rf /usr/bin/java （删除系统默认java）

#ln -s /usr/java /usr/local/java

2，设置java环境变量

#vi /etc/profile

在/etc/profile最后面添加如下内容：

?export JAVA_HOME=/usr/java/jdk1.6.0_22
export JAVA_BIN=/usr/java/jdk1.6.0_22/bin
export CALSSPATH=.:$JAVA_HOME/lib.tools.jar
export PAHT=$JAVA_HOME/bin:$PATH

按下ESC输入:x

保存退出，让设置的变量生效输入：

#source /etc/profile

3,检查看java版本看看安装是否正确：

#java -version

?ava version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Client VM (build 17.1-b03, mixed mode, sharing)

4,安装tomcat

#cd /usr/src

#tar zxvf ?apache-tomcat-7.0.5.tar.gz

#mv ??apache-tomcat-7.0.5 /usr/local/tomcat

5,启动tomcat。

#/usr/local/tomcat/bin/startup.sh

?Using CATALINA_BASE: /usr/local/tomcat
Using CATALINA_HOME: /usr/local/tomcat
Using CATALINA_TMPDIR: /usr/local/tomcat/temp
Using JRE_HOME: /usr/java/jdk1.6.0_22
Using CLASSPATH: /usr/local/tomcat/bin/bootstrap.jar:/usr/local/tomcat/bin/tomcat-juli.jar

6,查看tomcat服务端口

#netstat -lnt

?Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:608 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 :::8009 :::* LISTEN
tcp 0 0 :::3306 :::* LISTEN
tcp 0 0 :::8080 :::* LISTEN
tcp 0 0 :::22 :::* LISTEN

至此，tomcat安装结束。

7,分别启动tomcat和nginx

#/usr/local/tomcat/bin/startup.sh (在192.168.2.202/192.168.2.203上分别运行)

#/usr/local/nginx/sbin/nginx （在192.168.2.220上运行）

测试结果：http://192.168.2.220

如果出现猫头证明环境搭建完成，这里我建议更改下tomcat的默认页面，便于区分。

让tomcat和nginx在开机启动可以运行下面脚本：

#echo "/usr/local/tomcat/bin/startup.sh" >>/etc/rc.local

#echo "/usr/local/nginx/sbin/nginx" >>/etc/rc.local