Nginx负载均衡设置

二、负载均衡策略

1、轮询（默认）

2、指定权重

3、IP 绑定 ip_hash

4、fair（第三方）

5、url_hash（第三方）

三、轮询（默认）

1、模拟集群

设置两个 Tomcat 同时访问一个 servlet

import Javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(“/NginxServlet”)
public class NginxServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println(“Nginx 负载均衡！”);
        System.out.println(“ 当前访问端口：”+request.getServerPort());
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}

2、修改 nginx.conf 文件

 3、启动 Nginx 和 Tomcat

 4、访问 www.znzn.com/NginxServlet  2 次

 5、控制台效果  80 和 81 端口输出一次

四、设置权重

1、模拟集群

设置两个 Tomcat 同时访问一个 servlet

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(“/NginxServlet”)
public class NginxServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println(“Nginx 负载均衡！”);
        System.out.println(“ 当前访问端口：”+request.getServerPort());
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}

2、修改 nginx.conf 文件

 3、启动 Nginx 和 Tomcat

 4、访问 www.znzn.com/NginxServlet  5 次

 5、控制台效果（底层算法默认先走一遍轮询）80 输出 2 次 81 输出 1 次

五、IP 绑定 

1、模拟集群

设置两个 Tomcat 同时访问一个 servlet

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet(“/NginxServlet”)
public class NginxServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println(“Nginx 负载均衡！”);
        System.out.println(“ 当前访问端口：”+request.getServerPort());
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }
}

2、修改 nginx.conf 文件

 3、启动 Nginx 和 Tomcat

 4、访问 www.znzn.com/NginxServlet 

 5、控制台效果  无论访问几次都只会在 80 端输出