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1. First, Docker should be installed in CentOS 7, Docker installation reference 2. Pull the docker image of ZooKeeper and go to https://hub.docker.com/ Search relevant zoomkeeper images on docker pull zookeeper:3.4.14 3. Create three folders corresponding to three containers on the host computer /root/zookeeper01/conf /root/zookeeper01/d ...

For starters, it may be difficult to understand why some practices are safer. However, some of the following tips may be beyond the scope of PHP.   Always use braces Let's look at the following code: if (isset($condition) && true === $condition) echo 'this is a success'; //It's true, but look at the code below if (isset($condi ...

_Recent reviews of Spring Cloud-related sources have added enable s to each new starter, such as: @EnableDiscoveryClient, which registers applications with Eureka Server and pulls services owned by Eureka Server into a micro-service system.Click on the EnableDiscoveryClient source code and you will find the @import annotation inside.The ...

brief introduction SDK is generally provided for APP social login. There are two situations for SDK First kind SDK provider returns openId and logs in to our interface system with openId to apply for token Create the OpenIdAuthenticationToken class: /** * */ package com.spring.security.social.openid; import java.util.Collection ...

4.7 error handling mechanism 4.7.1. Default error handling mechanism of SpringBoot 1. Default effect: 1) Return to an error page Request headers sent by browser: 2) If it is another client, it will respond to a json data by default. { "timestamp":"2020-03-14T15:56:48.897+0000", "status":404, "error":"Not Found", "message":"No ...

brief introduction Creating threads is the most basic operation in multithreaded programming 1. Inherit Thread class and override run() method public class CreatingThread01 extends Thread { @Override public void run() { System.out.println(getName() + " is running"); } public static void main(String[] args) { new ...

In the previous article, we explained how nginx establishes a connection and reads data when a request arrives.After reading the data, nginx sets the callback method for reading events to ngx_http_process_request_line(), which has the following main functions: Read the data requested by the client, and continue to listen for client read events ...

brief introduction Before modification, password login returns standard OAuth2 login success message Technological process Refer to this process to generate a token in the login success processor HkAuthenticationSuccessHandler and return: This is a successful processor copied from the previous browser project. We need to install the abov ...

Introduction to reflection 1, Introduction & overview In order to have more flexible access to all the contents of the class (including private), we need reflection technology     Reflection: the act or characteristic of mapping a complete thing (the super power of any content in a single operation class) Get member methods / memb ...

Reference resources https://blog.51cto.com/14157628/2473866?source=dra Before deploying Prometheus, due to the low configuration of the experimental environment, the original dashboard and Scope were deleted! Before you actually deploy Prometheus, you should understand the relationships and functions among the components of Prometheus: 1) ...