hadoop生态搭建（3节点）-15.Nginx_Keepalived_Tomcat配置

# Nginx+Tomcat搭建高可用
服务器名称 预装软件 IP地址
Nginx服务器 Nginx1 192.168.6.131
Nginx服务器 Nginx2 192.168.6.132

# ==================================================================node1 node2

yum -y install gcc gcc-c++ autoconf


# http://www.pcre.org/
# ==================================================================安装 Pcre
scp -r ~/pcre2-10.32.tar.gz node2:~/


tar zxf ~/pcre2-10.32.tar.gz
cd pcre2-10.32
./configure --prefix=/usr/local/pcre && make && make install


rm -rf ~/pcre2-10.32.tar.gz
rm -rf ~/pcre2-10.32


# https://www.openssl.org/source/
# ==================================================================安装 openssl
# 在rabbitmq安装过就不用再执行了
# scp -r ~/openssl-1.1.0g.tar.gz node2:~/

# tar -zvxf ~/openssl-1.1.0g.tar.gz
# cd openssl-1.1.0g
# ./config --prefix=/usr/local/openssl && make && make install


# rm -rf ~/openssl-1.1.0g.tar.gz
# rm -rf ~/openssl-1.1.0g


# http://www.zlib.net/
# ==================================================================安装 zlib
scp -r ~/zlib-1.2.11.tar.gz node2:~/


tar -zxvf ~/zlib-1.2.11.tar.gz
cd zlib-1.2.11
./configure --prefix=/usr/local/zlib && make && make install


rm -rf ~/zlib-1.2.11.tar.gz
rm -rf ~/zlib-1.2.11


# http://nginx.org/download/
# ==================================================================安装 nginx
scp -r ~/nginx-1.14.0.tar.gz node2:~/


tar -zxvf ~/nginx-1.14.0.tar.gz
cd nginx-1.14.0
./configure --prefix=/usr/local/nginx && make && make install


rm -rf ~/nginx-1.14.0.tar.gz
rm -rf ~/nginx-1.14.0


# 环境变量
vi /etc/profile

# 在export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL下添加

export NGINX_HOME=/usr/local/nginx

export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$NGINX_HOME/sbin


# 使环境变量生效
source /etc/profile


# 查看配置结果
echo $NGINX_HOME


# 启动
$NGINX_HOME/sbin/nginx -c $NGINX_HOME/conf/nginx.conf


# 查看Nginx的进程号
ps -ef|grep nginx


# 三种关闭方式 将***替换为具体的进程号
# 从容停止
kill -QUIT ***

# 快速停止
kill -TERM ***
# kill -INT ***

# 强制停止
pkill -9 nginx

# ==================================================================node1

# http://archive.apache.org/dist/tomcat/tomcat-8/v8.5.31/bin/
# ==================================================================安装 tomcat
tar -zxvf ~/apache-tomcat-8.5.31.tar.gz -C /usr/local
mv /usr/local/apache-tomcat-8.5.31 /usr/local/tomcat


rm -rf ~/apache-tomcat-8.5.31.tar.gz

# 环境变量
# ==================================================================node1 node2 node3

vi /etc/profile

# 在export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE HISTCONTROL下添加

export JAVA_HOME=/usr/java/jdk1.8.0_111
export ZOOKEEPER_HOME=/usr/local/zookeeper-3.4.12
export HADOOP_HOME=/usr/local/hadoop-2.7.6
export MYSQL_HOME=/usr/local/mysql
export HBASE_HOME=/usr/local/hbase-1.2.4
export HIVE_HOME=/usr/local/hive-2.1.1
export SCALA_HOME=/usr/local/scala-2.12.4
export KAFKA_HOME=/usr/local/kafka_2.12-0.10.2.1
export FLUME_HOME=/usr/local/flume-1.8.0
export SPARK_HOME=/usr/local/spark-2.3.0
export STORM_HOME=/usr/local/storm-1.1.0
export ERLANG_HOME=/usr/local/erlang
export RABBITMQ_HOME=/usr/local/rabbitmq_server-3.7.5
export MONGODB_HOME=/usr/local/mongodb-3.4.5
export REDIS_HOME=/usr/local/redis-4.0.10
export RUBY_HOME=/usr/local/ruby-2.5.1
export NGINX_HOME=/usr/local/nginx
export CATALINA_BASE=/usr/local/tomcat
export CATALINA_HOME=/usr/local/tomcat
export TOMCAT_HOME=/usr/local/tomcat

export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$ZOOKEEPER_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$MYSQL_HOME/bin:$HBASE_HOME/bin:$HIVE_HOME/bin:$SCALA_HOME/bin:$KAFKA_HOME/bin:$FLUME_HOME/bin:$SPARK_HOME/bin:$SPARK_HOME/sbin:$STORM_HOME/bin:$ERLANG_HOME/bin:$RABBITMQ_HOME/ebin:$RABBITMQ_HOME/sbin:$MONGODB_HOME/bin:$REDIS_HOME/bin:$RUBY_HOME/bin:$NGINX_HOME/sbin:$CATALINA_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native

 

# ==================================================================node1

# 使环境变量生效
source /etc/profile


# 查看配置结果
echo $CATALINA_BASE
echo $CATALINA_HOME
echo $TOMCAT_HOME


scp -r $CATALINA_HOME node2:/usr/local/
scp -r $CATALINA_HOME node3:/usr/local/

# ==================================================================node2 node3

# 使环境变量生效
source /etc/profile


# 查看配置结果
echo $CATALINA_BASE
echo $CATALINA_HOME
echo $TOMCAT_HOME

# ==================================================================node1 node2 node3

# 启动tomcat
$CATALINA_HOME/bin/startup.sh


# 停止tomcat
$CATALINA_HOME/bin/shutdown.sh


# 远程查看
# http://node1:8080
# http://node2:8080
# http://node3:8080

# Nginx+Tomcat实现Web服务器的负载均衡

服务器名称 预装软件 IP地址
Nginx服务器 Nginx1 192.168.6.131
Nginx服务器 Nginx2 192.168.6.132
Web服务器1 tomcat 192.168.6.131
Web服务器2 tomcat 192.168.6.132
Web服务器3 tomcat 192.168.6.133

# ==================================================================node1

mkdir $CATALINA_HOME/webapps/test

# 编写测试静态页
vi /usr/local/tomcat/webapps/test/login.html

<html>
    <head>
        <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
    </head>
    <body>
        <h1>您正在访问：node1</h1>
		<h1>login.html</h1>
    </body>
</html>

# ==================================================================node2

mkdir /usr/local/tomcat/webapps/test

# 编写测试静态页
vi /usr/local/tomcat/webapps/test/login.html

<html>
    <head>
        <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
    </head>
    <body>
        <h1>您正在访问：node2</h1>
		<h1>login.html</h1>
    </body>
</html>

# ==================================================================node3

mkdir /usr/local/tomcat/webapps/test 

# 编写测试静态页
vi /usr/local/tomcat/webapps/test/login.html

<html>
    <head>
        <meta http-equiv="content-type" content="text/html;charset=UTF-8" />
    </head>
    <body>
        <h1>您正在访问：node3</h1>
		<h1>login.html</h1>
    </body>
</html>

# http://node1:8080/test/login.html
# http://node2:8080/test/login.html
# http://node3:8080/test/login.html

# ==================================================================node1

cp $NGINX_HOME/conf/nginx.conf $NGINX_HOME/conf/nginx.conf.bak

vi $NGINX_HOME/conf/nginx.conf

user nobody;
# 工作进程个数，一般跟服务器cpu核数相等，或者核数的两倍
worker_processes 2;

# 单个进程最大连接数
events{
    worker_connections 1024; 
}

http{
    keepalive_timeout 65;
    gzip on;
	
    # 服务器集群
    upstream tomcatcluster{
        # 集群有几台服务器即可配置几台，weight表示权重，权重越大被访问到的几率越大
        # 启动好Tomcat服务器
        server node1:8080 weight=1 max_fails=2 fail_timeout=30s;
        server node2:8080 weight=1 max_fails=2 fail_timeout=30s;
        server node3:8080 weight=1 max_fails=2 fail_timeout=30s;
    }

    #nginx基本配置
    server{
        listen 8088; #端口号
        server_name node1; #服务名
        location /{
            #将访问请求转向至服务器集群, tomcatcluster 和上面 upstream tomcatcluster 对应
            proxy_pass http://tomcatcluster;
            # 真实的客户端IP
            proxy_set_header   X-Real-IP        $remote_addr;
            # 请求头中Host信息
            proxy_set_header   Host             $host;
            # 代理路由信息，此处取IP有安全隐患
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            # 真实的用户访问协议
            proxy_set_header   X-Forwarded-Proto $scheme;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;  
        }
    }
}

# ==================================================================node2

cp $NGINX_HOME/conf/nginx.conf $NGINX_HOME/conf/nginx.conf.bak

vi $NGINX_HOME/conf/nginx.conf

user nobody;
# 工作进程个数，一般跟服务器cpu核数相等，或者核数的两倍
worker_processes 2;

# 单个进程最大连接数
events{
    worker_connections 1024; 
}

http{
    keepalive_timeout 65;
    gzip on;
	
    # 服务器集群
    upstream tomcatcluster{
        # 集群有几台服务器即可配置几台，weight表示权重，权重越大被访问到的几率越大
        # 启动好Tomcat服务器
        server node1:8080 weight=1 max_fails=2 fail_timeout=30s;
        server node2:8080 weight=1 max_fails=2 fail_timeout=30s;
        server node3:8080 weight=1 max_fails=2 fail_timeout=30s;
    }

    #nginx基本配置
    server{
        listen 8088; #端口号
        server_name node2; #服务名
        location /{
            #将访问请求转向至服务器集群, tomcatcluster 和上面 upstream tomcatcluster 对应
            proxy_pass http://tomcatcluster;
            # 真实的客户端IP
            proxy_set_header   X-Real-IP        $remote_addr;
            # 请求头中Host信息
            proxy_set_header   Host             $host;
            # 代理路由信息，此处取IP有安全隐患
            proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
            # 真实的用户访问协议
            proxy_set_header   X-Forwarded-Proto $scheme;
        }

        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;  
        }
    }
}

# ==================================================================node1 node2

# 查看Nginx的进程号
ps -ef|grep nginx


# 停止
kill -QUIT ***


# 启动
$NGINX_HOME/sbin/nginx -c $NGINX_HOME/conf/nginx.conf


# http://node1:8088/test/login.html
# http://node2:8088/test/login.html

# Nginx服务器做负载均衡和动静分离，Web服务器1 Web服务器2 Web服务器3 做集群
# ==================================================================node1 node2 node3

mkdir -p $CATALINA_HOME/webapps/test/img

# 上传 testimg.jpg

# ==================================================================node1
cp ~/testimg.jpg $CATALINA_HOME/webapps/test/img/


# 编写测试静态页
vi $CATALINA_HOME/webapps/test/index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Nginx动静分离测试</title>
</head>
    <body>
        <h1>您正在访问：node1</h1>
        <img src="/test/img/testimg.jpg" alt="测试" />
    </body>
</html>


scp -r ~/testimg.jpg node2:$CATALINA_HOME/webapps/test/img/
scp -r ~/testimg.jpg node3:$CATALINA_HOME/webapps/test/img/


# ==================================================================node2
# 编写测试动态页
vi $CATALINA_HOME/webapps/test/index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Nginx动静分离测试</title>
</head>
    <body>
        <h1>您正在访问：node2</h1>
        <img src="/test/img/testimg.jpg" alt="测试" />
    </body>
</html>


# ==================================================================node3
# 编写测试动态页
vi /usr/local/tomcat/webapps/test/index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Nginx动静分离测试</title>
</head>
    <body>
        <h1>您正在访问：node3</h1>
        <img src="/test/img/testimg.jpg" alt="测试" />
    </body>
</html>


# http://node1:8080/test/index.jsp
# http://node2:8080/test/index.jsp
# http://node3:8080/test/index.jsp

# http://node1:8088/test/index.jsp
# http://node2:8088/test/index.jsp

# ==================================================================node1 node2

mkdir -p /data/webapps

# 加入下面的配置
vi $NGINX_HOME/conf/nginx.conf

http{
	
	server{
		charset    utf-8; #设置编码为utf-8;

		#静态文件交给nginx处理
		location ~ .*\.(htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma)$ {
			root  /data/webapps;
			expires 30d;
		}
		#静态文件交给nginx处理
		location ~ .*\.(js|css)?$ {
			root /data/webapps;
			expires 1h;
		}
	}
}


# 查看Nginx的进程号
ps -ef|grep nginx


# 停止
kill -QUIT ***


# 启动
$NGINX_HOME/sbin/nginx -c $NGINX_HOME/conf/nginx.conf


# 测试Nginx动静分离
# http://node1:8088/test/index.jsp
# http://node2:8088/test/index.jsp


mkdir -p /data/webapps/test/img
cp -r $CATALINA_HOME/webapps/test/img /data/webapps/test/


# 测试Nginx动静分离
# http://node1:8088/test/index.jsp
# http://node2:8088/test/index.jsp



shutdown -h now
# 快照 Nginx_Tomcat集群

服务器名称 预装软件 IP地址
Nginx服务器 Nginx1+Keepalived(Master) 192.168.6.131
Nginx服务器 Nginx2+Keepalived(Backup) 192.168.6.132
Web服务器1 tomcat 192.168.6.131
Web服务器2 tomcat 192.168.6.132
Web服务器3 tomcat 192.168.6.133

# Nginx+Keepalived+Tomcat搭建高可用/负载均衡/动静分离的Webserver集群

# 添加虚拟IP（VIP）

# ==================================================================node1
vi /etc/sysconfig/network-scripts/ifcfg-ens33

# BOOTPROTO=dhcp
BOOTPROTO=static
# ONBOOT=no
ONBOOT=yes
IPADDR=192.168.6.131
IPADDR1=192.168.6.141
NETMASK=255.255.255.0
GATEWAY=192.168.6.2
DNS1=192.168.6.2


systemctl restart network
ip addr


# ==================================================================node2
vi /etc/sysconfig/network-scripts/ifcfg-ens33

# BOOTPROTO=dhcp
BOOTPROTO=static
# ONBOOT=no
ONBOOT=yes
IPADDR=192.168.6.132
IPADDR1=192.168.6.142
NETMASK=255.255.255.0
GATEWAY=192.168.6.2
DNS1=192.168.6.2


systemctl restart network
ip addr




# ==================================================================安装 keepalived
yum install -y psmisc

scp -r ~/keepalived-2.0.5.tar.gz node2:~/


tar -zxvf ~/keepalived-2.0.5.tar.gz
cd ~/keepalived-2.0.5


yum -y install libnl libnl-devel


yum install -y libnfnetlink-devel


./configure --prefix=/usr/local/keepalived


make && make install


rm -rf ~/keepalived-2.0.5.tar.gz


cd ~

# 环境变量
# ==================================================================node1 node2
vi /etc/profile

export NGINX_HOME=/usr/local/nginx
export CATALINA_BASE=/usr/local/tomcat
export CATALINA_HOME=/usr/local/tomcat
export TOMCAT_HOME=/usr/local/tomcat
export KEEPALIVED_HOME=/usr/local/keepalived

export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$NGINX_HOME/sbin:$CATALINA_HOME/bin:$KEEPALIVED_HOME/sbin


# 使环境变量生效
source /etc/profile


# 查看配置结果
echo $KEEPALIVED_HOME


# ==================================================================node1 node2
mkdir /etc/keepalived

# cp $KEEPALIVED_HOME/etc/keepalived/keepalived.conf /etc/keepalived/
cp ~/keepalived-2.0.5/keepalived/etc/init.d/keepalived /etc/init.d/
cp $KEEPALIVED_HOME/etc/sysconfig/keepalived /etc/sysconfig/

ln -s $KEEPALIVED_HOME/sbin/keepalived /usr/sbin/
# ln -s $KEEPALIVED_HOME/sbin/keepalived /sbin/


# 设置 keepalived 服务开机启动
chkconfig keepalived on


# 创建并赋予权限
touch $KEEPALIVED_HOME/check_nginx.sh && chmod a+x $KEEPALIVED_HOME/check_nginx.sh


vi $KEEPALIVED_HOME/check_nginx.sh

#!/bin/bash

COUNT=$(ps -C nginx --no-header |wc -l)
echo $COUNT
# 判断Nginx 是否都挂掉了
if [ $COUNT -eq 0 ]
then
	# 如果挂掉了，就启动nginx
	/usr/local/nginx/sbin/nginx
	echo "重启nginx"

	# 等5秒钟后，再次查看是否启动成功
	sleep 5

	# 如果nginx没有启动起来，就直接干掉keepalived
	COUNT=$(ps -C nginx --no-header |wc -l)
	if [ $COUNT -eq 0 ]
	then
		echo "干掉keepalived"
		# 如果killall命令不能使用，就需要安装psmisc工具了
		# yum install -y psmisc
		killall keepalived
	fi
fi


# ==================================================================node1
vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   # 主服务器，从服务器需修改，表示运行keepalived服务器的一个标识
   # 标识本节点的字条串,通常为hostname
   router_id node1
}

# 监控服务.NGINX mysql等
vrrp_script chk_nginx {
    script "/usr/local/keepalived/check_nginx.sh"
    # 每2s检查一次
    interval 2
    # 每次检查-20
    weight -20
}

vrrp_instance VI_1 {
	# 主从设置 MASTER/BACKUP
    state MASTER
	# 绑定VIP的网络接口，通过ifconfig查看自己的网络接口
    interface ens33
	# 虚拟路由的ID号,两个节点设置必须一样,可选IP最后一段使用,相同的VRID为一个组,他将决定多播的MAC地址
    virtual_router_id 51
	# 节点优先级，值范围0～254，MASTER要比BACKUP高优先级
    priority 100
	# 设定MASTER与BACKUP负载均衡器之间同步检查的时间间隔，两个节点必须设置一样，默认为1秒
    advert_int 1
    authentication {
        auth_type PASS
		# 设定授权密码，密码相同的为一个集群
        auth_pass 1111
    }
	# nginx存活状态检测脚本
    track_script {
        chk_nginx  
    }
	# 虚拟ip地址
    virtual_ipaddress {
        192.168.6.150
    }
}


# ==================================================================node2
vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   # 主服务器，从服务器需修改，表示运行keepalived服务器的一个标识
   # 标识本节点的字条串,通常为hostname
   router_id node1
}

# 监控服务.NGINX mysql等
vrrp_script chk_nginx {
    script "/usr/local/keepalived/check_nginx.sh"
    # 每2s检查一次
    interval 2
    # 每次检查-20
    weight -20
}

vrrp_instance VI_1 {
	# 主从设置 MASTER/BACKUP
    state BACKUP
	# 绑定VIP的网络接口，通过ifconfig查看自己的网络接口
    interface ens33
	# 虚拟路由的ID号,两个节点设置必须一样,可选IP最后一段使用,相同的VRID为一个组,他将决定多播的MAC地址
    virtual_router_id 51
	# 节点优先级，值范围0～254，MASTER要比BACKUP高优先级
    priority 99
	# 设定MASTER与BACKUP负载均衡器之间同步检查的时间间隔，两个节点必须设置一样，默认为1秒
    advert_int 1
    authentication {
        auth_type PASS
		# 设定授权密码，密码相同的为一个集群
        auth_pass 1111
    }
	# nginx存活状态检测脚本
    track_script {
        chk_nginx  
    }
	# 虚拟ip地址
    virtual_ipaddress {
        192.168.6.150
    }
}

# ==================================================================node1 node2
# 启动服务
$NGINX_HOME/sbin/nginx -c $NGINX_HOME/conf/nginx.conf

$CATALINA_HOME/bin/startup.sh

service keepalived start

# 停止服务
service keepalived stop

# 重启服务
service keepalived restart


ps -ef | grep keepalived


# 测试
# http://node1:8088/test/index.jsp
# http://192.168.6.150:8088/test/index.jsp



shutdown -h now
# 快照 Nginx_Keepalived_Tomcat

# ==================================================================参考

vi $NGINX_HOME/sbin/nginx.conf

user nobody;
# 工作进程个数，一般跟服务器cpu核数相等，或者核数的两倍
worker_processes 2;

# 单个进程最大连接数
events{
    worker_connections 1024; 
}

server{
    listen 8088; #端口号
    server_name node1; #服务名
}

http{
	# 设置默认类型为二进制流
	default_type    application/octet-stream;

	server_names_hash_bucket_size   128;
	#指定来自客户端请求头的headerbuffer大小，设置为32KB
	client_header_buffer_size   32k;
	#指定客户端请求中较大的消息头的缓存最大数量和大小，这里是4个32KB
	large_client_header_buffers 4 32k;
	#上传文件大小
	client_max_body_size 356m;
	#nginx的HttpLog模块指定，指定nginx日志的输出格式，输出格式为access
	log_format access '$remote_addr - $remote_user [$time_local] "$request" '
			'$status $body_bytes_sent "$http_referer" '
			'"$http_user_agent" "$http_x_forwarded_for"';
	#access日志存在未知
	access_log  /var/log/nginx/access.log   access;
	#开启高效模式文件传输模式，将tcp_nopush和tcp_nodelay两个指另设置为on，用于防止网络阻塞。
	sendfile    on;
	tcp_nopush  on;
	tcp_nodelay on;
	#设置客户端连接保持活动的超时时间
	keepalive_timeout   65;
	server_tokens   off;
	#客户端请求主体读取缓存
	client_body_buffer_size 512k;
	proxy_connect_timeout   5;
	proxy_send_timeout      60;
	proxy_read_timeout      5;
	proxy_buffer_size       16k;
	proxy_buffers           4 64k;
	proxy_busy_buffers_size 128k;
	proxy_temp_file_write_size 128k;

	#开启gzip
	gzip    on;
	#允许压缩的最小字节数
	gzip_min_length 1k;
	#4个单位为16k的内存作为压缩结果流缓存
	gzip_buffers 4 16k;
	#设置识别HTTP协议版本，默认是1.1
	gzip_http_version 1.1;
	#gzip压缩比，可在1~9中设置，1压缩比最小，速度最快，9压缩比最大，速度最慢，消耗CPU
	gzip_comp_level 2;
	#压缩的类型
	gzip_types text/plain application/x-javascript text/css application/xml;
	#让前端的缓存服务器混村经过的gzip压缩的页面
	gzip_vary   on;

	# 服务器集群
	upstream tomcatcluster{
		# 集群有几台服务器即可配置几台，weight表示权重，权重越大被访问到的几率越大
		# 启动好Tomcat服务器
		server node1:8080 weight=1;
		server node2:8080 weight=1;
		server node3:8080 weight=1;
	}

	server{
		listen 8088;
		server_name node1;
		charset    utf-8; #设置编码为utf-8;

		#location / {
		#    root   html;
		#    index  index.html index.htm;
		#}

		#location ~ .*\.(jsp|do|action)$
		location / {
			proxy_next_upstream http_502 http_504 error timeout invalid_header;
			proxy_pass http://tomcatcluster;
			# 真实的客户端IP
			proxy_set_header   X-Real-IP        $remote_addr;
			# 请求头中Host信息
			proxy_set_header   Host             $host;
			# 代理路由信息，此处取IP有安全隐患
			proxy_set_header   X-Forwarded-For  $proxy_add_x_forwarded_for;
			# 真实的用户访问协议
			proxy_set_header   X-Forwarded-Proto $scheme;
		}
		#静态文件交给nginx处理
		location ~ .*\.(htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma)$ {
			root  /data/webapps;
			expires 30d;
		}
		#静态文件交给nginx处理
		location ~ .*\.(js|css)?$ {
			root /data/webapps;
			expires 1h;
		}
		error_page   500 502 503 504  /50x.html;

		location = /50x.html {
			root   html;
		}
	}
}