Micro service component sentinel console call

02 Microservice component Sentinel （ Console version ）

Step one linux To configure

 

Start the console command （ Pay attention to dragging the file into linux Under the opt）

#1  Open edit file 
vim dashboard.sh
# Copy the following   account number cm  password ok（ Be careful  -   You may have to hit it manually ）
java -Dserver.port=8858 -Dsentinel.dashboard.auth.username=cm  -Dsentinel.dashboard.auth.password=ok -jar /opt/sentinel-dashboard-1.8.1.jar
​
#2  Authorization file name 
chmod 777 dashboard.sh
ls
./dashboard.sh
cat dashboard.sh
ls /opt/
​
#3  Browser launch （ Enter your own address ）
http://192.168.64.200:8858/#/login
#4  account number cm  password ok

 

The above content is displayed and successfully entered ！！！

Sentinel  It will be initialized the first time the client calls , Start sending heartbeat packets to the console , So make sure the client has access ;

Spring Cloud Alibaba Integrate Sentinel

First step To configure pom

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

The second step is configuration controller

@RestController
@RequestMapping("/nssent")
public class InitCtrl {
    @RequestMapping("/init")
    public String sayHello(){
        return "Hello World";
    }
}
​

Step 3 configuration yml

server:
  port: 12005
spring:
  application:
    name: nessentinelctl
  cloud:
    sentinel:
      transport:
        dashboard: 192.168.64.200:8858

Step 4 start the browser to input

http://localhost:12005/nssent/init
# Refresh several times   Enter the following address 
http://192.168.64.200:8858/#/dashboard

Step 5 realize flow control

#1 stay controller Add code Custom flow control prompt

@RestController
@RequestMapping("/nssent")
public class InitCtrl {
    @RequestMapping("/init")
    @SentinelResource(value = "it",blockHandler = "ctlHandler")
    public String sayHello(){
        return "Hello World";
    }
    public String ctlHandler(BlockException ex){
        return " You are under flow control o(╥﹏╥)o";
    }
}

 

 

install jmeter（ Pressure test ）

 Click on jemter.bat

 

java Code implementation replaces jemeter test （ Pure code version ）

# The first step is to import pom rely on

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.13</version>
</dependency>

# The second step is to write code

import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Hello world!
 *
 */
public class App 
{
    public static void main( String[] args )
    {
        // Create a thread pool   Default 10 Threads 
        ExecutorService pool = Executors.newFixedThreadPool(10);
        //for Loop execution 10 Time 
        for (int i = 0; i < 10; i++) {
            pool.execute(()->{
                try {
                    CloseableHttpClient chc= HttpClients.createDefault();
                    HttpGet get = new HttpGet("http://localhost:12005/nssent/init");
                    CloseableHttpResponse response= chc.execute(get);
                    System.out.println( Thread.currentThread().getName()+"--------->"+
                            EntityUtils.toString(response.getEntity()));
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            });
        }
    }
}

 

------------- project Writing interface -------------（ Expand knowledge And sentinel irrelevant ）

 

 

 

get length  255 byte   2048 character 
post 2g  There is no limit to the theory 

 

 

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	"high":100,
	"weight":60,
	"scene-manager":"2022-SBZL-05966",
	"indate":"2022-03-12",
	"range":"2.6-60"
	
}