tomcat简单部署，nginx负载均衡
实验说明：主机A、B上部署tomcat，C上安装nginx部署实现负载均衡,主机A、B、C部署如下：
A tomcat 172.16.10.15
B tomcat 172.16.10.17
C nginx 172.16.10.16
A主机和B主机做tomcat，并分别在主机上部署一个应用（添加JSP测试页）
1、安装tomcat和openjdk
yum -y install java-1.8.0-openjdk-devel tomcat tomcat-admin-webapps tomcat-docs-webapp tomcat-lib tomcat-webapps
2、编辑tomcat配置文件，部署应用（添加JSP测试页）
vim /etc/tomcat/server.xml
...
<Engine name="Catalina" defaultHost="www.xmj.com">
<Host name="www.xmj.com" appBase="/data/webapps" unpackWARs="true" autoDeploy="true">
<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
prefix="xmj_access_log." suffix=".log"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
...
创建应用目录，并编辑测试页
mkdir -pv /data/webapps/ROOT/{class,lib,WEB-INF}
cd /data/webapps/ROOT/
vim index.jsp
<%@ page language="java" %>
<html>
<head><title>TomcatA</title></head>
<body>
<h1><font color="red">TomcatA.magedu.com</font></h1>
<table align="centre" border="1">
<tr>
<td>Session ID</td>
<% session.setAttribute("magedu.com","magedu.com"); %>
<td><%= session.getId() %></td>
</tr>
<tr>
<td>Created on</td>
<td><%= session.getCreationTime() %></td>
</tr>
</table>
</body>
</html>
重启tomcat服务
systemctl restart tomcat
ss -ntl 会看到tomcat服务对应的8080、8005和8009端口都已打开
3、A、B、C主机编写hosts文件
vim /etc/hosts
172.16.10.16 www.xmj.com
测试：
http://172.16.10.15:8080
http://172.16.10.17:8080
http://www.xmj.com
C主机上部署nginx，实现负载均衡
yum -y install nginx
vim /etc/nginx/nginx.conf
...
http {
...
upstream appsrvs{
server 172.16.10.15:8080;
server 172.16.10.17:8080;
}
...
server {
listen 80;
server_name www.xmj.com;
index index.jsp index.html;
location / {
proxy_pass http://appsrvs/;}
}
...
}
...
启动nginx服务
systemctl restart nginx
刷新
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