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  Proximity Cards Do More Than Just Open Doors

Credit: Susanne Plank via Pexels Locksmiths from centuries ago couldn’t have possibly imagined opening a door by tapping a card roughly the size of a credit card. Back then, security depended on physical locks, not sealed antennas made from coiled wire, integrated circuits, and capacitors. Today, proximity cards are a popular form of keycard used in hotels, government buildings, healthcare facilities, and many more places. They open doors for people with authorized access, but they also d...

   LOCK,PRINTING     2024-04-11 22:04:07

  What is Hystrix and How does Hystrix work

Background In distributed systems, there is one effect where the unavailability of one service or some services will lead to the service unavailability of the whole system, this is called service avalanche effect. A common way to prevent service avalanche is do manual service fallback, in fact Hystrix also provides another option beside this. Definition of Service Avalanche Effect Service avalanche effect is a kind of effect where the service provider fails to provide service which causes t...

   AVALANCHE EFFECT,HYSTRIX,DISTRIBUTED SYSTEM     2019-02-04 06:00:38

  The First Bite on etcd Code

Etcd, one of the crucial components of Kubernetes. If APIServer is the heart, then etcd is the blood vessel that sends the end state of Kubernetes resources to various “organs”, providing high-speed, stable storage, and supporting APIServer’s high load performance. What if the etcd is not working properly? Just the condition as someone has a vascular disease. The deeper you know about them, the better diagnose you can make when issues occur. from unspl...

   SOURCE CODE,ETCD     2022-02-12 01:03:14

  This Is Why Your Website Is Slow

Click for a larger image Ghostery, the browser plugin that allows its users to "track the trackers," just released data on the tags, widgets and analytics on websites that are the worst in terms of slowing page loads to a crawl. Update: Ghostery discovered an error in their original data set. It appears that Millenial Media was not on this year's list at all, and the #2 slot belonged to AdFunky. Both the text and the graph above have been changed to reflect this. Any webmaster worth his or he...

   Web application,Performance,Slow,Reason,Lagtag     2011-11-30 11:45:25

  Install multiple versions of Go

As a developer, there might be need in some cases to have multiple versions of Go installed. One may test out some new features of the latest version of Go but also wanna maintain a stable version of Go for daily development purpose. How to maintain multiple versions of Go? The GoLang official website has provided a way to maintain multiple versions of Go by using go get to install the different versions of Go. Below are steps: Download a normal version of Go and install it Go to the Go release...

   MULTIPLE VERSION,GO BINARY,GO VERSION     2021-05-16 02:01:46

  How-to: Remotely shut down your computer

Think of this scenario; You are lying in bed and just finished watching a movie that you were streaming from a computer downstairs. You want to sleep, but you need to head downstairs to turn the computer off. Save some time, and do it from the computer upstairs.There are a number of ways that you can restart or shutdown remote computers. You could use a remote desktop connection, but there are quicker ways and we will look at them today.This article will show you various methods you ca...

   Windows,Shutdown,Remote control,Cmd     2011-10-10 06:18:44

  Strict mode in JavaScript

1. Introduction In addition to normal mode, ECMAScript 5 includes the other mode : strict mode. It means it will make JavaScript codes execute in a more strict environment. The purposes to have strict mode are: Remove some unreasonable and parts of JavaScript syntax. Reduce some of the quirk behaviors. Remove some insecure parts of code execution. Make the execution environment more secure Improve interpret efficiency and increase the execution speed Build foundation for future JavaScript versi...

   JavaScript, Strict mode. Introduction     2013-01-17 05:00:26

  Service discovery with etcd

In previous post, we have talked about etcd and its usage. This post we will cover how to implement server discovery with etcd. Service discovery is to solve one of the most commonly seen scenarios in distributed system where how to find the corresponding target service to talk to. In short, it is to find some server which one can talk to based on some service name. A complete service discovery system include below three key functions: Service registration: A service must register itself to so...

   ETCD,SERVICE DISCOVERY,DEMO,TUTORIAL     2021-03-08 05:36:29

  Cloud Computing’s most Basic Concepts-Service Models

With the containerization of Docker, Kubernetes, CNCF, and the development of open-source communities, related frameworks and technology is booming and iterating rapidly. Cloud Computing, been applied for many years, is pushing developers into the new technological era. Companies and developers who are not using or not planning to use Cloud-Native gradually feel tremendous pressure in keeping up with the technology trends. The first step is to understand the concepts of IaaS, PaaS, FaaS, SaaS, S...

   CLOUD,PAAS,IAAS,CONCEPT     2021-01-24 05:23:11

  22 Awesome Admin Panels For Web Developers

On internet, there are number of tutorials are available to learn how to create website designs, that makes your work more easier and simple. But users don’t know what processing going in back end part. Today we are providing some awesome admin panel that helps programmers to operate websites’ s back end section. Now a days, A big number of admin panels are available that always makes your project more easier. These panels has useful features and functionality that make it mo...

   Web design,Admin panel,Backend system,De     2011-08-23 08:02:06