Programmer Think

1 uninstall the old version: yum remove docker \ docker-client \ docker-client-latest \ docker-common \ docker-latest \ docker-latest-logrotate \ docker-logrotate \ docker-engine 2 installation environment yum instal ...

introduction In the previous articles, I mainly used LWIP protocol stack to implement httpd server and some applications. In this article, we will implement another MQTT protocol which is widely used in the Internet of things. I won't talk about the definition of MQTT protocol. I mainly remember that MQTT protocol is a subscription / publi ...

Eureka highly available Client retry mechanism: retryableeureka httpclient Here are a few questions I asked myself when I read the source code. First put them forward. I hope people who read this article will read them with questions, and then preliminarily introduce the EurekaHttpClient system. Later, I will talk about RetryableEurekaHt ...

catalogue preface 1, What is object-oriented? 2, Three characteristics of object-oriented 1. Packaging 2. Succession 3. Polymorphism 1. Heavy load 2. Rewrite 3. Abstract class 4. Interface summary preface Last time we talked about Java's basic data types, operators and permission modifiers. This time, let's learn the most familiar ...

introduce Series: DC (10 sets in total) Release date: September 8, 2019 Difficulty: Intermediate Flag: the ultimate goal of this challenge is to bypass two factor authentication, gain root privileges and read unique flags study: sql injectionWebsite hanging horseexim4 right raising Target address: https://www.vulnhub.com/entry/dc-8,367/ ...

1 what is flattening? I went to Wikipedia. There is no direct explanation about flattening, only an explanation of flattening organization. First, let's talk about the organization opposite to flattening: Pyramid organization. As we all know, its hierarchical structure is a pyramid shape. Flat organization, also known as horizontal organizat ...

1. What is the single case?1.1 advantages1.2 disadvantages2. Several methods of destroying single case2.1 creating objects through constructors2.2 reflection call constructor2.3 the clonable interface is implemented2.4 single example of serialization failure3. Summary1. What is the single case?Singleton pattern: it is a kind of creation design ...

Access control design of platform management background The access control design here is implemented by spring security, which is not much different from the implementation method of the access control part in Chapter 10 SSO design. The difference is that OAuth 2 is not required here, and a simpler method is used for the design of permission ...

Original link: http://tecdat.cn/?p=18149Original source: Tuo end data tribal official accountDriverless cars can be traced back to 1989. Neural networks have existed for a long time. What are the reasons for the upsurge of artificial intelligence and deep learning in recent years? [1 second] part of the answer lies in Moore's law and the signif ...

Installing Jenkins in Linux Environment First, you must install the java runtime environment before installing Jenkins Download JDK After entering the page, download the 64 bit package, jdk-8u181-linux-x64 tar. GZ and jdk-8u181-linux-x64 Rpm is OK. The following will introduce the installation methods of the two packages respectively. Select ...