Nginx+Tomcat简单负载均衡配置

实验环境：
192.168.3.151 nginx负载均衡服务器
192.168.3.152 tomcat实例1
192.168.3.153 tomcat实例2
【部署tomcat服务器】
1.下载tomcat源码包和jdk包，两台tomcat同步进行

//可自行根据版本需求下载
wget https://mirrors.bfsu.edu.cn/apache/tomcat/tomcat-9/v9.0.36/bin/apache-tomcat-9.0.36.tar.gz
//jdk包可在Oracle官网下载
https://www.oracle.com/java/technologies/javase-jre8-downloads.html

2.解压tomcat和jdk包，两台tomcat同步进行

tar xf apache-tomcat-9.0.36.tar.gz -C /usr/local
tar xf jdk-8u151-linux-x64.tar.gz -C /usr/local/
cd /usr/local/
//创建软链接
ln -s apache-tomcat-9.0.36 tomcat
ln -s jdk1.8.0_151 java
//设置java环境变量
vim /etc/profile

JAVA_HOME=/usr/local/java
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME PATH
//重新读取环境变量
source /etc/profile
//查看java版本
java -version
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

3.修改tomcat网站页面便于区分是否进行分发

vim /usr/local/tomcat/webapps/ROOT/index.jsp
//tomcat1
<html>
    <title> tomcat1</title>
    <body   bgcolor="blue">
            <h1>    tomcat1-8080</h1>
    </body>
</html>
//tomcat2
<html>
    <title> tomcat2</title>
    <body   bgcolor="red">
            <h1>    tomcat2-8080  </h1>
    </body>
</html>

4.启动tomcat

//绝对路径启动
/usr/local/tomcat/bin/startup.sh

【部署负载均衡服务器】
1.通过ngnx官网下载nginx的yum仓库

vim /etc/yum.repos.d/nginx.repo
[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=1
enabled=1
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true

[nginx-mainline]
name=nginx mainline repo
baseurl=http://nginx.org/packages/mainline/centos/$releasever/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true

2.安装nginx

yum -y install nginx

3.修改nginx配置

vim /etc/nginx/nginx.conf
//在http下方添加负载均衡配置，tomcat可跟进需求修改，同步修改location内的tomcat，名称禁用_下划线，会报错
    upstream tomcat {
        server 192.168.3.152:8080;
        server 192.168.3.153:8080;
        }
    server {
    listen 80;
    server_name localhost;
    root /usr/share/nginx/html;

    location / {
    proxy_pass http://tomcat;
    }
    }

4.启动nginx

systemctl start nginx
systemctl enble nginx

【测试负载均衡】
访问192.168.3.151，刷新页面检测是否分发页面