apache结合tomcat实现负载均衡

首先装tomcat服务步骤如下：

1、关闭防火墙和安全机制

[root@localhost ~]# systemctl stop firewalld
[root@localhost ~]# iptables -F
[root@localhost ~]# setenforce 0
2、查看JDK是否安装

[root@localhost ~]# java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-b10)
OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)
3、卸载用rpm方式安装的JDK

方法一、

[root@localhost ~]# rpm -qa | grep -i openjdk    检测是否为需要的版本
java-1.8.0-openjdk-headless-1.8.0.222.b10-0.el7_6.x86_64
java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64

[root@localhost ~]# rpm -e java-1.8.0-openjdk --nodeps //有依赖关系，解除依赖关系后面加 --nodeps
[root@localhost ~]# rpm -e java-1.8.0-openjdk-headless
[root@localhost ~]# rpm -qa | grep -i openjdk

方法二、

[root@localhost ~]# which java

/usr/bin/java

[root@localhost ~]# rm -rf /usr/bin/java

[root@localhost ~]# java -version
-bash: /usr/bin/java: 没有那个文件或目录
4、安装JDK

[root@localhost ~]# tar -xf jdk-8u191-linux-x64.tar.gz   //解压压缩包

[root@localhost ~]# mv jdk1.8.0_191/ /usr/local/java //将解压后的包移动到指定目录下

[root@localhost ~]# /usr/local/java/bin/java -version //此时只有通过绝对路径才可以查看java的版本号信息

[root@localhost ~]# vim /etc/profile //修改

export JAVA_HOME=/usr/local/java //设置java的根目录

export PATH=$PATH:$JAVA_HOME/bin //在PATH环境变量中添加java根目录下的bin子目录

[root@localhost ~]# echo $PATH //在未执行修改的脚本时查看PATH变量
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
[root@localhost ~]# source /etc/profile //重置一下脚本
[root@localhost ~]# echo $PATH //再查一遍
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin:/usr/local/java/bin
5、Tomcat安装

[root@localhost ~]# tar -xf apache-tomcat-8.5.16.tar.gz

[root@localhost ~]# mv apache-tomcat-8.5.16 /usr/local/tomcat8

[root@localhost ~]# ls /usr/local/tomcat8/bin
bootstrap.jar setclasspath.sh
catalina.bat shutdown.bat
catalina.sh shutdown.sh
catalina-tasks.xml startup.bat
commons-daemon.jar startup.sh （启动文件）
commons-daemon-native.tar.gz tomcat-juli.jar
configtest.bat tomcat-native.tar.gz
configtest.sh tool-wrapper.bat
daemon.sh tool-wrapper.sh
digest.bat version.bat
digest.sh version.sh
setclasspath.bat

//.bat Windows版本

//.sh Linus版本
6、启动

复制代码
[root@localhost ~]# /usr/local/tomcat8/bin/startup.sh
Using CATALINA_BASE: /usr/local/tomcat8
Using CATALINA_HOME: /usr/local/tomcat8
Using CATALINA_TMPDIR: /usr/local/tomcat8/temp
Using JRE_HOME: /usr/local/java
Using CLASSPATH: /usr/local/tomcat8/bin/bootstrap.jar:/usr/local/tomcat8/bin/tomcat-juli.jar
Tomcat started.

[root@localhost ~]# netstat -anpt | grep :8080
tcp6 0 0 :::8080 :::* LISTEN 3226/java

注意事项：实际访问时要ip加：8080

第二台tomcat以上面步骤在做一遍

httpd服务

[root@localhost ~]# yum -y install httpd   //安装httpd服务

[root@localhost ~]# cd /etc/httpd/
[root@localhost httpd]# ls
conf conf.d conf.modules.d logs modules run
[root@localhost httpd]# cd conf
[root@localhost conf]# ls
httpd.conf magic
[root@localhost conf]# vim httpd.conf      //修改主配置文件添加以下内容

<Proxy balancer://tomcat/>

    BalancerMember ajp://192.168.200.111:8009/ loadfactor=1

    BalancerMember ajp://192.168.200.112:8009/ loadfactor=1

    proxyset lbmethod=byrequests

</Proxy>

proxyrequests   off

ProxyPass / balancer://tomcat/

proxypassreverse / balancer://tomcats/

ProxyPass /server-status !

ProxyPass /balancer-manager !

[root@localhost conf]# systemctl restart httpd    //重新启动httpd服务

为了实验效果两台tomcat将展示页面做成不同的