Monitor page deployment

In addition to downgrading and fusing the service, we can also monitor it in real time, just install the monitoring page, here we create a new project and import dependencies:

org.springframework.cloudspring-cloud-starter-netflix-hystrix-dashboard2.2.10.RELEASE

Then add the configuration file:

server:port: 8900hystrix:dashboard:# Add localhost to the whitelist, which is not allowed by defaultproxy-stream-allow-list: "localhost"

Then create the main class, note that you need to add the @EnableHystrixDashboard annotation to open the management page:

@[email protected] class HystrixDashBoardApplication {public static void main(String[] args) {SpringApplication.run(HystrixDashBoardApplication.class, args);}}

Start the Hystrix management page service, and then we need to add the Actuator dependency to the service to be monitored:

org.springframework.bootspring-boot-starter-actuator

Actuator is the monitoring system of SpringBoot program, which can realize health check, record information, etc.Before using it, you need to introduce spring-boot-starter-actuator and do a simple configuration.

After adding this dependency, we can view the operation in IDEA:

Then configure Actuator in the configuration file to add exposure:

management:endpoints:web:exposure:include: '*'

Then we open the management page just started, the address is: http://localhost:8900/hystrix/

Fill in the service to be monitored in the middle: for example, the borrowing service: http://localhost:8301/actuator/hystrix.stream, note that /actuator/hystrix.stream, then click Monitor Stream to enter the monitoring page:

You can see that it is in the Loading state now. This is because the statistics have not yet started. We now try to call our service several times:

You can see that after the call, information appears on the monitoring page:

You can see that the 5 visits are normal, so it is displayed in green. Next, let's try to close the book service, which will cause the service to be degraded or even broken, and then visit this service multiple times to seeSee how monitoring changes:

It can be seen that the error rate has soared to 100%, and errors have continued to occur for a period of time, and the circle in the center has also turned red, and we continue to visit:

Maintain continuous access in the event of a large number of errors, you can see that the service has been blown at this time, the Circuit has changed to the Open state, and the circle in the figure has also becomeLarger, it means the pressure is continuing to rise.