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  Supervisord, God and Monit, which one to choose?

With the popularity of Docker, more and more service have been moved into docker containers and they are easy to build up and maintain for each atomic service(though it's a bit complex to maintain multiple docker containers which contain different service to form a complete solution). Ideally, each docker container should only contain one service which has only one running process. However, in reality there would be cases multiple processes would run in one single docker container and there is a...

   DEVOPS,MONIT,SUPERVISORD,GOD,DOCKER     2017-11-25 12:28:11

  Java SynchronizedList and Iterator

While reading some material about concurrency, I come up with some writing about using SynchronizedList wrap about normal List to enable synchronization.   But one interesting thing is http://docs.oracle.com/javase/7/docs/api/java/util/Collections.html#synchronizedList%28java.util.List%29   It says     It is imperative that the user manually synchronize on the returned list when iterating over it:     1   List list = Collections.synchronizedList(new A...

       2015-12-03 03:04:08

  Usability Testing Of Your App

Testing your mobile app for usability means following the best practices in app design. It is recommended if you want to keep your users. You need focus groups to test the app during its creation and after development. This process has its own drawbacks even when it is done with the traditional methods.Apparently, you will prefer real individuals as well as a fraction of the target audience to do the app testing. These people will report any unappealing feature or missing feature in its user int...

   TOP APP DEVELOPMENT COMPANIES,APP TESTING,MOBILE APP DEVELOPMENT,MOBILE APPS     2017-12-04 04:27:21

  Python basics summary

Python is recommended by many people as the first language to be learned now. Even in some universities, it is the primary language to be taught to CS/CE students. To master this languages, we should understand some basics of it. Here we summarize some basics about this language. These basics include : string replacement with regular expression, traverse a directory, sort a list, remove duplication, dictionary ordering, dictionary, list, string conversion, date object manipulation, command line ...

   Python,Summary     2013-09-23 10:04:42

  Google plans to deprecate FTP URL support in Chrome

Currently people can access FTP list and download resources hosted on FTP servers in Chrome through FTP URLs, but this may not work anymore in the near future. In a post published by Chrome engineers, there is a plan to deprecate FTP support in Chrome version 82. The major motivation for this deprecation is that Chrome doesn't have an encrypted FTP connection support(FTPs), this raises security risk of downloading resources over FTP. Since users can access FTP URLs and download resources, there...

   CHROME 82,CHROME,FTP     2019-08-16 21:35:02

  Server monitoring shell scripts

There are many open source server monitoring software such as cacti and nagios. Besides these, can we write our own shell scripts to monitor them? The shell scripts written by ourselves can fulfill our special requirements better and have a more detailed coverage. Below are some commonly used shell scripts used by Evangelist, an Oracle DBA. 1. Check network gateway traffic #!/bin/bash #network #Mike.Xu while : ; do time='date +%m"-"%d" "%k":"%M' day='date +%m"-"%d' rx_before='...

   Server monitor,CPU,memory,shell     2013-08-30 21:56:14

  Data as code

What is a good command line parser API? A good command line parser should consider below 5 aspects: Support convenient help information generation Support sub commands, for example, git has push,pull,commit sub commands. Support single character option, word option, flag option and option with parameter. Support default option, for example, if no -port is set, set it as 5037 Support usage model, for example, tar's -c and -x is mutually exclusive, they belong to different usage models. Here are...

   Command line,API     2013-08-08 22:40:36

  ECMAScript 5 Objects and Properties

ECMAScript 5 is on its way. Rising from the ashes of ECMAScript 4, which got scaled way back and became ECMAScript 3.1, which was then re-named ECMAScript 5 (more details)- comes a new layer of functionality built on top of our lovable ECMAScript 3. Update: I've posted more details on ECMAScript 5 Strict Mode, JSON, and More. There are a few new APIs included in the specification but the most interesting functionality comes into play in the Object/Property code. This new code gives you th...

   ECMAScript,Object,Property     2012-01-29 04:38:50

  A mini guide to HTTP referer

In HTTP header, there is a field named Referer which is to provide the referrer of the current accessed page. In this post, we will introduce the usage of HTTP referer field. On the web, when a user visits a webpage, s/he must be from some place. This place is usually referred a s referer. This information is very important to some website operators and server owners as they want to know where they get the traffic from and this helps them provide better service for potential targeted users. In t...

   HTML,HTTP REFERER,REFERRERPOLICY     2019-06-29 02:23:25

  Snipping Tool is moving on Windows 10

There is some recent change for a built-in tool on Windows 10 where the Snipping Tool is moving. Snipping Tool is a tool on Windows for taking screenshots and editing screenshots taken. But now it's moving to a new tool called Snip & Sketch which has enhanced features. Now if you try to launch Snipping Tool, you will notice there is a notification telling that the Snipping tool is moving to a new tool called Snip & Sketch. And you can click Try Snip & Sketch to launch the new tool. ...

   WINDOWS 10,SNIPPING TOOL,SNIP & SKETCH,SCREENSHOT     2019-11-03 02:30:53

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