Tomcat-多实例

作用：
多实例运行不同的应用（类似虚拟主机）
多实例运行相同的应用（实现负载均衡，支持高并发处理，session问题）


tomcat单机多实例配置
Tomcat：/usr/local/tomcat/{bin,lib}

baidu:   /usr/local/tomcat/baidu/{conf,logs,temp,work,webapps}       8081
163:      /usr/local/tomcat/163/{conf,logs,temp,work,webapps}          8082
google:  /usr/local/tomcat/google/{conf,logs,temp,work,webapps}     8083

webapps: /webapps/ROOT

1. Tomcat安装<略>

2. 配置多实例目录
    # tree -d -L 3 /usr/local/tomcat/
        /usr/local/tomcat/
        ├── bin
        ├── lib
    ├── 163
        │   ├── conf
        │   ├── logs
        │   ├── temp
        │   ├── webapps
        │   └── work
        ├── baidu
        │   ├── conf
        │   ├── logs
        │   ├── temp
        │   ├── webapps
        │   └── work
        ├── google
            ├── conf
            ├── logs
            ├── temp
            ├── webapps
            └── work


3. 配置实例server.xml
    # vim /usr/local/tomcat/baidu/conf/server.xml
        <!-- <Connector port="8009" protocol="AJP/1.3" redirectPort="8443" /> -->
        <Server port="8091" shutdown="SHUTDOWN">
        <Connector port="8081" protocol="HTTP/1.1"
                       connectionTimeout="20000"
                       redirectPort="8443" />
        <Host name="localhost"  appBase="/webapps"
                    unpackWARs="true" autoDeploy="true">

4. 写启动脚本
    # vim /usr/local/tomcat/baidu/tomcat-baidu.sh
        #!/bin/bash
        #baidu
        export CATALINA_HOME="/usr/local/tomcat"
        export CATALINA_BASE="/usr/local/tomcat/baidu"
        case "$1" in 
        start)
              $CATALINA_HOME/bin/startup.sh;;
        stop)
              $CATALINA_HOME/bin/shutdown.sh;;
        restart)
              $CATALINA_HOME/bin/shutdown.sh
              $CATALINA_HOME/bin/startup.sh;;              
        esac

         
5. 启动测试
    # /usr/local/tomcat/baidu/tomcat-baidu.sh start
    # /usr/local/tomcat/163/tomcat-163.sh start
    # /usr/local/tomcat/163/tomcat-google.sh start

    # netstat -tanp |grep 80
        tcp        0      0 :::8081                          :::*                        LISTEN      1587/java           
        tcp        0      0 :::8082                          :::*                        LISTEN      1560/java           
        tcp        0      0 :::8083                          :::*                        LISTEN      1752/java           
        tcp        0      0 ::ffff:127.0.0.1:8091       :::*                        LISTEN      1587/java           
        tcp        0      0 ::ffff:127.0.0.1:8092       :::*                        LISTEN      1560/java           
        tcp        0      0 ::ffff:127.0.0.1:8093       :::*                        LISTEN      1752/java                     
        tcp        0      0 :::8009                          :::*                        LISTEN      1560/java