摘要：负载调度器双负载及会话复制后端数据库环境作用一共享之前配置步骤关闭防火墙或者开放端口，，，关闭安装从官网下载最新版不启动两台主机进行安装从官网下载需要许可，允许之后下载至本地，导入主机从官网找到或者

环境：

步骤：

①关闭防火墙或者开放端口80，8080，3306，关闭selinux

②安装nginx

从nginx官网下载最新版
wget http://nginx.org/download/nginx-1.13.9.tar.gz

[root@192 ~]# yum -y install pcre-devel zlib-devel gcc gcc-c++ make

[root@192 ~]# useradd -M -s /sbin/nologin nginx

[root@192 ~]# tar zxf nginx-1.13.9.tar.gz -C /usr/src

[root@192 ~]# cd /usr/src/nginx-1.13.9/

[root@192 nginx-1.13.9]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx --with-http_stub_status_module && make && make install

[root@192 ~]# ln -s /usr/local/nginx/sbin/nginx /usr/local/sbin

不启动nginx

③两台tomcat主机进行安装

jdk从官网下载需要许可，允许之后下载至本地，导入主机
tomcat从官网downloads找到tomcat7.0或者更高版本
wget http://mirror.bit.edu.cn/apache/tomcat/tomcat-7/v7.0.86/bin/apache-tomcat-7.0.86.tar.gz

[root@192 ~]# tar zxf jdk-7u65-linux-x64.gz -C /usr/src

[root@192 ~]# tar zxf apache-tomcat-7.0.54.tar.gz -C /usr/src

[root@192 ~]# mv jdk1.7.0_65/ /usr/local/java

[root@192 ~]# mv apache-tomcat-7.0.54/ /usr/local/tomcat7

[root@192 ~]# vim /etc/profile

export JAVA_HOME=/usr/local/java
export CATALINA_HOME=/usr/local/tomcat7
export PATH=$JAVA_HOME/bin:$CATALINA_HOME/bin:$PATH

[root@192 ~]# source /etc/profile

[root@192 ~]# java -version

java version "1.8.0_171"
Java(TM) SE Runtime Environment (build 1.8.0_171-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)

[root@192 ~]# catalina.sh version

Using CATALINA_BASE:   /usr/local/tomcat7
Using CATALINA_HOME:   /usr/local/tomcat7
Using CATALINA_TMPDIR: /usr/local/tomcat7/temp
Using JRE_HOME:        /usr/local/java
Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar
Server version: Apache Tomcat/7.0.
Server built:   May 19 2014 10:26:15
Server number:  7.0.86.0
OS Name:        Linux
OS Version:     3.10.0-327.el7.x86_64
Architecture:   amd64
JVM Version:    1.7.0_65-b17
JVM Vendor:     Oracle Corporation

启动tomcat
[root@192 ~]# /usr/local/tomcat7/bin/startup.sh

Using CATALINA_BASE:   /usr/local/tomcat7
Using CATALINA_HOME:   /usr/local/tomcat7
Using CATALINA_TMPDIR: /usr/local/tomcat7/temp
Using JRE_HOME:        /usr/local/java
Using CLASSPATH:       /usr/local/tomcat7/bin/bootstrap.jar:/usr/local/tomcat7/bin/tomcat-juli.jar
Tomcat started.

测试访问

http://192.168.2.6:8080
http://192.168.2.7:8080

④两台主机修改tomcat配置文件
[root@192 ~]#cd /usr/local/tomcat7/conf

[root@192 ~]#cp server.xml server.xml.bak

[root@192 ~]#vim server.xml

.......


        

[root@192 ~]#mkdir -p /web/webapp1

[root@192 ~]#vim /web/webapp1/index.jsp

<%@page language="java" import="java.util.*" pageEncoding="UTF-8"%>

 

 

 
Session serviced by tomcat

<% session.setAttribute("abc","abc");%>
      


 
Session ID
     
<%=session.getId()%>

Create on
<%= session.getCreationTime() %>

   

重启tomcat
[root@192 ~]#shutdown.sh
[root@192 ~]#startup.sh

注意:第二台主机不同处server.xml中jvmRoute=”tomcat-2”，还有index.jsp中

测试访问看到两台tomcat主机session ID不同，准备工作完成

http://192.168.2.6:8080
http://192.168.2.7:8008

步骤：

①两台主机配置会话共享群集
[root@192 ~]#vim /usr/local/tomcat7/conf/server.xml

.......


      
      
      

         

         
            
            
            
              
            
            
            
          

          
          

  

  
      
    
  
  
    
    
  

  
    

[root@192 ~]#mkdir /web/webapp1/WEB-INF

[root@192 ~]#cp /usr/local/tomcat7/conf/web.xml WEB-INF/

[root@192 ~]#vim WEB-INF/web.xml

  #添加这个单词，必须有这一步，否则用户的session没法使用

如果开启防火墙的话，开启以下
[root@192 ~]#firewall-cmd --add-port=45564/udp --permanent
[root@192 ~]#firewall-cmd --add-port=4000/tcp --permanent
[root@192 ~]#firewall-cmd --reload

重启tomcat
[root@192 ~]#shutdown.sh
[root@192 ~]#startup.sh

注意：两个tomcat配置一样只要在Receiver段指对第二台主机ip地址即可

②配置nginx
[root@192 ~]#vim /usr/local/nginx/conf/nginx.conf

.......
http { 
.......
upstream tomcat_server {
        server 192.168.2.6:8080 weight=1;
        server 192.168.2.7:8080 weight=1;
  }

    #gzip  on;

    server {
        listen       80;
        server_name  localhost;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location / {
            root   html;
            index  index.html index.htm;
            proxy_pass http://tomcat_server;
        }

启动nginx，访问nginx地址刷新页面测试访问

[root@192 ~]#nginx

http://192.168.2.5

步骤：

①192.168.2.8中的mysql容器作为数据库服务器，配置mysql：
mysql>grant all privileges on . to javauser@’192.168.2.%’ identified by ‘123.com’;

mysql> create database javatest

mysql>use javatest

mysql>create table testdata(id int not null auto_increment primary key,foo varchar(25),bar varchar(10));

mysql>insert into testdata(foo,bar) values(‘hello’,’123.com’);

mysql>select * from testdata;

②下载mysql-connector-java-5.1.22-bin.jar 复制到tomcat7/lib/目录下(两台tomcat都需要配置)
[root@192 ~]# cp mysql-connector-java-5.1.22-bin.jar /usr/local/tomcat7/lib/

③配置context.xml
[root@192 ~]# cp /usr/local/tomcat7/conf/context.xml /usr/local/tomcat7/conf/context.xml.bak

[root@192 ~]# vim /usr/local/tomcat7/conf/context.xml

    
    WEB-INF/web.xml
    

④配置web.xml
[root@192 ~]# vim /web/webapp1/web.xml

......

MySQL Test App
 
    DB Connection
    jdbc/TestDB
    javax.sql.DataSource
    Container
 

⑤编写连接数据库jsp文件
[root@192 ~]# vim /web/webapp1/test.jsp

<%@ page language="java" import="java.sql.*" pageEncoding="GB2312"%>

  
    
  

connect MySQL

<%
String driverClass="com.mysql.jdbc.Driver";
String url="jdbc:mysql://192.168.2.8:3306/javatest";
String username = "javauser";
String password = "123.com";
Class.forName(driverClass);
Connection conn=DriverManager.getConnection(url, username, password);
Statement stmt=conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from testdata");
while(rs.next()){
 out.println("
foo:"+rs.getString(2)+"bar:"+rs.getString(3));
}
rs.close();
stmt.close();
conn.close();
%>

⑥重启tomcat，测试连接
[root@192 ~]# shutdown.sh
[root@192 ~]# startup.sh

http://192.168.2.5/test.jsp