Kubernetes 与 Docker Swarm的对比
Kubernetes 和Docker Swarm 可能是使用最广泛的工具，用于在集群环境中部署容器。但是这两个工具还是有很大的差别。
Kubernetes
Google根据其在Linux上容器管理经验，改造到docker管理上，就是kubernetes。他的在许多方面表现良好。最重要的是构造于Google多年的宝贵经验只上。
如果你从docker1.0以上开始使用kubernetes，你得到的用户体验会非常良好。比如你会发现kubernetes解决一些docker自身的问题。例如你可以mount（绑定）持久化存储卷（volume），以便于在迁移docker时不至于丢失数据。
kubernetes使用flannel（一个使用go写的虚拟网络的开源系统）构造容器间的网络通信。它还内置有负载均衡。除此之外，它的“服务发现”使用了etcd（一个使用golang编写的开源虚拟网络系统）。然而，使用kubernetes是有代价的。首先，它用一个不同的命令行接口，不同的编程接口及不同的YAML文件定义等。换言之，你不能使用docker命令行接口也不能用docker compose来定义容器。为了使用kubernetes，所有所有的东西都需要从头开始。这就好像这个工具并不是为了docker写的一样（这个在某种程度上确实是）。kubernetes把集群带到了一个全新的高度，代价是学习曲线比较陡。
Docker Swarm
docker-swarm 使用了一个不同的方式。它是docker原生的集群工具。
最方便的部分是它暴露了docker标准的编程接口，意味着你之前一直在使用的任何与docker沟通的工具（docker命令行接口，docker compose，dokku，krane等等），都可以无缝的在docker swarm上使用。
这个其实是个双刃剑，毁誉参半。一直可以使用自己得心应手熟悉的工具，这再好不过了，然而，这样意味着我们又被docker紧紧的“耦合”了（而非业界一直追求的松耦合”）。如果你需要的都能满足，那皆大欢喜。可是如果不是呢，要是你有特殊需求这些API满足不了怎么办？这是就不得不去耍一些“小聪明”。
我们来仔细剖析下这两个工具，主要会从如何在集群中运行容器，这两个工具分别如何安装以及他们提供的功能。
安装设置
安装设置swarm非常简单，简单明了并且很灵活。我们需要做的就是安装一个服务发现工具，然后在所有的节点上安装swarm容器。因为它自己就是以一个docker容器来部署的，因此它在不同的操作系统上运行方式都是没有差别的。我们运行swarm容器，开放一个端口，然后告知服务发现模块的地址。这不能再简单了。我们甚至可以在没有任何服务发现模块的情况下开始使用，来看看我们是否喜欢它，当开始真正认真的要使用时再去添加etcd，consul或者其他支持的工具。
相比较而言，kubernetes的安装就有点复杂晦涩了。不同的操作系统上安装都不同。每个操作系统都有自己的独立安装指令和运维团队。比如说，如果你选择使用vagrant来试用，然后在Fedora这里遇到问题卡住了，但这不是意味着其他的（比如Ubuntu或者coreos）也不能用。你可以，不过要开始在kubernetes官方以外到处搜索. 你所需要的很可能在某个社区论坛里提供的解决方案，但是你需要时间去查询，运气好的话可以在第一次尝试就能用。一个严重的问题是安装kubernetes依赖于bash脚本。如果我们是处于配置管理不是必须的情况下是，这个本身可能不是大问题。我们可能不希望运行一个脚本，而是希望kubernetes成为puppet，chef或者ansible的一部分。同样，这个也是可以解决的。你可以找到ansible 的安装手册来动行kubernetes或者你自己去写。跟swarm比这些都不是什么大问题,只是一点点的小痛苦而已。使用刀砍请不要期待任何的安装文档，除非都可使用docker命令行的时候运行的参数而已。我们打算去运行容器，swarm可以实现这个，但kubernetes 没有。有些人可能并不在意具体是使用哪个服务发现的工具。我喜欢swarm背后提倡的那种极简风格，以及他背后的逻辑，内置电池，拆留由已。任何东西都是拆箱可用但是我们还提供了选项让你去替换其中的任一个模块。
与swarm不同的是，kubernetes 是一个可配置的工具。你需要跟kubernetes提供的各个选项来共生存。例如，如果你打算使用kubernets,你必须要使用etcd.我不是说etcd不好(实际上正好相反)，但是如果你习惯于，比如你在非常复杂的业务场景下使用consul，如果要使用服务发现，必须特别针对kubernets使用一个，而剩下的其他部分使用其他一个产品。另外一个对使用Kubernets觉得不方便的地方就是你需要在事先了解各种事情。比如，你需要告诉他要用到的所有节点的地址，每个节点的职责是什么,这个集群有多少个“小黄人” (minion,是kubernet对于一个集群中机器之前叫的名字)，等等。 而使用Swarm，我们只需要启动一个节点，告诉他加入网络，就可以了。我们不需要提前告诉关于集群其他的信息，因为这些信息会通过各个节点间的 “八卦”（gossip protocol）来传输。
配置本身也许并不是这些工具之间最大的差别。不管你使用哪个工具，或早或晚，所有都会配置好并运行起来，到时候你们就会忘掉在配置时的痛苦经历。你可能会说我们之所以选择某个工具就是因为它安装配置简单吧。很公平的。我们继续往下讨论如何定义容器及之上的这些工具。
运行容器
如果使用Swarm来运行Docker容器，你如何去定义所有的参数呢？ 实际上你根本不需要！你所做的跟使用Swarm之前没有什么不同。比如，你习惯于使用Docker CLI（命令行接口），你可以继续使用几乎相同的命令。如果你习惯于使用Docker Componse来运行容器，你可以继续在Swarm集群中使用。不管你之前习惯于怎么使用容器，你仍旧可以使用，只是在更大级别的集群中使用。
Kubernetes要求你去学习它自己的CLI（命令行接口）和配置。你不能使用你之前创建的docker-compose.yml配置，你必须要去新建与Kubernetes对应的配置。你也不能使用之前学习的Docker CLI（命令行接口）。你必须要去学习 Kubernetes CLI（命令行接口），并且很有可能，确保你整个公司机构也要去学习。
不管你选择哪个工具来部署集群，你都要先熟悉Docker。你可能已经习惯于使用 使用Docker Compose来定义你运行容器的参数。如果你曾经使用它超过几个小时，你可能就会直接使用它而扔掉Docker CLI。你可以使用它运行容器，跟踪日志变化，等等。另外一方面，你可能是Docker的 “死忠”，看不上 Docker Compose，而是任何事都使用Docker CLI，或者你甚至自己写bash脚本来运行容器。不管哪种方式，这些都可以在Docker Swarm上使用。
如果你选择Kubernetes，请先准备好同一件事需要有多个定义配置。你需要使用 Docker Compose来运行Kubernetes范围外的容器。开发人员需要继续在他们的笔记本电脑上运行容器，你的测试环境可能也不是一个大集群，等等。换言之，如果你选择了Docker，那么 Docker Compose 和 Docker CLI将是不可避免的。你肯定会在某些地方或者以某种方式用到它们。一旦你开始使用 Kubernetes，你就会发现你所有的 Docker Compose的配置都要翻译成 Kubernetes的方式，从这个时候，你也要开始维护这两个版本了。使用 Kubernetes，这些重复的事情意味着维护成本的提高。重复只是一个问题，另外的是你在集群中运行的命令将于集群外使用的命令不一样了。你之前学习并喜爱的Docker的所有命令在 Kubernetes集群内将是完全行不通了。
Kubernetes的开发团队强制你去按照他们的办事方式行事，其实不是为了让你过的那么苦。如此巨大差别的主要原因是 Swarm 和 Kubernetes针对同一问题采取了不同的处理手段。 Swarm团队决定使用跟Docker相同的API接口，因此我们看到这些之前有如此好的兼容性。结果就是，你可以使用几乎所有之前的东西，只是在更大级别的集群中使用而已。没有新的东西要去做，不需要去重复配置参数，也不需要去新学习什么。不管你是直接使用Docker CLIgipj使用Swarm，这些API接口是基本上一致的。不好的方面是如果你想Swarm去做某件事，但是这个在Docker API中没有，这样你就悲催了。简单来说，如果你在找一个工具，可以部署使用Docker API的容器到集群中，那么 Swarm就是解决方案。另一方面，如果你想要一个工具，可以解决Docker API办不到的事情，你就应该去试试 Kubernetes了。这就是功能性（ Kubernetes）VS. 简易性（Swarm）。
这里唯一还没有回答的问题就是这些限制是什么。主要的限制中有两个，网络配置和持续化存储卷。走到Swarm1.0，我们不能连接运行于不同服务器上的容器。事实上，现在我们仍然不能连接他们，但是我们可能通过跨主机网络来协助连接运行于不同服务器上的容器。这是个非常强大的功能。而 Kubernetes使用 flannel（一个使用go写的虚拟网络的开源系统）来实现网络路由。目前自从Docker1.0开始， 这个功能也成为Docker CLI的一部分了。
另外一个问题是持续化存储卷。Docker在1.9版本中引入此功能。直到最近，如果你持久化一个数据卷，这个容器就绑定到这个持续化卷所在的服务器上了。它不能再次移动，除非你使用一些恶心的小花招，比如在不同的服务器间复制这些数据卷文件。这些本身是一些比较慢的操作，这与Swarm等工具的初衷也是相违背的。即便你有时间去复制，你也不知道从哪里去复制，因为集群工具会认为你整个数据中心是一个实体。你的容器会部署到它认为最合适的地方（比如，运行最少容器，CPU或者内容使用率最低，等等）。现在已经有Docker内置的持久化卷了。网络和持久化卷缺失曾经是许多人放弃Swarm而去选择 Kubernetes。自从Docker1.9，这此已经成为过去式。
选择
当需要在Docker Swarm 和 Kubernetes做出选择时，可以考虑如下几点。你是否想依赖于Docker自己来解决集群的问题。如果是，选择Swarm。如果某些功能在Docker中不支持，那它也非常可能在Swarm中找不到，因为Swarm是依赖于Docker API的。另外一方面，如果你想要一个工具可以解决Docker的限制，Kubernetes将是不错的选择。Kubernetes不是基于Docker，而是基于Google多年对于管理容器的经验。它是按照自己的方式来行事。
真正的问题是Kubernetes这种自我的方式（与Docker非常的不同）相比于它提供的优点是否值得。或者，我们是不是应该押宝在Docker本身上，期待Docker将来会解决这些难题。在回答这些问题之前，请先看一下Docker1.9之后的版本。它已经有个网络配置及持久化卷。也有了所谓的“除非死掉 才去重启”的策略，这次方便去管理那些讨厌的错误。现在Kubernetes 和 Swarm之间的差异又少了3个。实际上，现如今，Kubernetes 相对于 Swarm的优势很少了。另一方面，Swarm使用了Docker API意味着你可以共用命令的配置。个人认为，我倾向于押宝于Docker引擎变得越来越好，这样Docker Swarm也会受益。这两者之间的差异已经非常小。两个都是可用于生产环境，但是Swarm更易于去配置，易于使用，并且可以重用在上集群之前的配置，不需要在集群和非集群环境下重复工作。
我个人的建议是使用Docker Swarm。而 Kubernetes太“任性”了，不易于配置，与Docker CLI，API差别太大，并且在Docker1.0之后，相对于Swarm来说没有太多的优势。他们之间其他的差距影响真的是不太大。但是Docker Swarm更易于配置。
其他
- 使用kubernetes的好处是在其前后基于Google对container管理几十年的经验，比如Borg。
- 使用某个特定容器其实并不是特别重要的事，最主要的还是集群技术。kubernetes类似于数据库操作领域的hibernate/ibates，即解耦合。在需要的时候我们可以使用Rocket替换Docker，对使用者透明。kubernetes这个功能在swarm中是找不到的。在生产环境中，如果需要，对于上层是透明的，没有任何影响。
- 不得不承认，Swarm更多的是一个部署工具，而Kubernetes是用于HA（高可用）架构的大规模的编配平台。
- Kubernetes是介于中间的产品，没有Swarm那么简单友好，也没有Mesos那么功能强大。因此很有可能是在Mesos上层使用Docker，而非与Kubernetes集成。
- 人们使用Mesos是因为它本身不是为了Docker或者容器设计的，它只是个集群抽象层。人们用就是因为它是唯一一个既支持部署应用程序又可以同时管理hadoop。（将来有可能不一定）
- 如果我是个开发人员，我会选择 Compose+Swarm,它简单易用。但是如果我是CTO，我会选择k8s，因为这样我就不用关于Docker API的兼容性问题了。
原文地址 ： https://technologyconversations.com/2015/11/04/docker-clustering-tools-compared-kubernetes-vs-docker-swarm/
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what’s API gateway An API Gateway is a key component in microservices architecture that acts as a single entry point for client requests to a microservices-b...
annoying-debug-logs-in-springboot-test
Stop annoying debug logs in spring boot test
how-to-stop-quartz-scheduling-during-springboot-test
how-to-stop-quartz-scheduling-during-springboot-test
Date Is The Most Ignored Treasure In Macbook
“The only way to do great work is to love what you do.” - Steve Jobs
Mysql Operator To Extract Json
“Believe you can and you’re halfway there.” - Theodore Roosevelt
Master Microfrontends
“The only way to do great work is to love what you do.” - Steve Jobs
How To Convert One Monolith Java System To Microservices
Whatever is worth doing is worth doing well.
How To Config JFR Java Flight Control
“Climb the mountains and get their good tidings. Nature’s peace will flow into you as sunshine flows into trees. The winds will blow their own freshness i...
How To Read Jdk Mission Control Report
Live the life you’ve imagined.
Jdk Mission Control Can Not Start In Macbook M1
“Climb the mountains and get their good tidings. Nature’s peace will flow into you as sunshine flows into trees. The winds will blow their own freshness i...
How To Keep Multiple Copy Paste Value In Macbook
“Winning is nice if you don’t lose your integrity in the process.” — Arnold Horshak
Google マップ内の写真のコメントが表示されない
紹介 私は、私のOppo Androidスマートフォンのアプリ「Googleマップ」で奇妙な問題が発生していることに気づきました。Googleマップで特定の場所（例えば「中央公園」）を検索すると、通常、このアプリは公園の写真やコメントリストを表示するはずです。例えば、誰かが公園の芝生や川の写真を投稿し、便利な場所...
Les commentaires des photos ne s’affichent pas dans Google Maps.
Introduction J’ai remarqué un problème étrange avec l’application “Google Maps” de mon téléphone Android Oppo. Lorsque vous recherchez un lieu sur Google Map...
Is Kerberos One Ssl/tls?
Nothing is as easy as it looks.
How To Save Expect Script Run Output To File Locally
Nothing is as easy as it looks.
Refind Java Concurrency
You are not a drop in the ocean, you are the entire ocean in a drop.
Refind Java Solid Principles
You are not a drop in the ocean, you are the entire ocean in a drop.
How To Extract Table Name From Sql By Python
You are not a drop in the ocean, you are the entire ocean in a drop.
How to find non-empty json value in mysql
You are not a drop in the ocean, you are the entire ocean in a drop.
master-cglib-in-java
You are not a drop in the ocean, you are the entire ocean in a drop.
What is shape function in python pandas
An honest days’ work makes for a good night’s sleep.
What is shape function in python pandas
Imagination is the key ingredient to a happy life.
What is default logic in python try except else
Keep an eye on the fruits of your labor.
Not just use git but know how git symbolic-ref work
Superheros come in all shapes and sizes.
Fix rejection error in Hexo
The heart can see what is invisible to the eye.
Guide to code productively, get more time back for you
The heart can see what is invisible to the eye.
Is Fibonacci sequence that starts with 0 or 1
The best way to predict the future is to create it.
To increase your productivity 10 times, learn expect and read this blog
Som are born beautiful. The rest of us have to work at it.
Treasure Bowl for SQL, helpful for your daily database jobs
Don’t be greedy. Half of something is better than all nothing.
How to fix most permission issues when using Git
The best way to predict the future is to create it.
One killer page to fix most permission issues when using Git
The best way to predict the future is to create it.
How to check your CPU model and Linux distribution in your AWS VM
Lift is short, enjoy the ride.
2022
Magic-in-Micronaut-JPA
The best way to predict the future is to create it.
谷歌地图里面照片的评论和照片在华为手机里面显示不出来
枝上柳棉吹又少, 天涯何处无芳草. –苏轼
Cannot find symbol class Generated or var
The best way to predict the future is to create it.
GraphQL noteworthy points
Life is like the ocean, it goes up and down.
Scripts bible for MySql
Be the Sun of your solar system.
Minium Workable Mvp Vimrc
”—————————————————————- “ 4. User interface “—————————————————————- “ Set X lines to the cursor when moving vertically set scrolloff=0
How to build unit/integration tests for Spring State Machine
Get busy living or get busy dying.
Magic after maven target spring-boot-run
Turn your wounds into wisdom
Bamboo pipeline deployment failure caused by Kubenetes Finalizer
Today a reader, tomorrow a leader.
Error in WSL in windows, command not found: sdk
Never stop learning, because life never stops teaching.
Could not write JSON: Value out of range. Value: “xxxxx” Radix:10
Life is really simple, but men insist on making it complicated.
Gemfire Geode Error on Peer or client version with ordinal xx not supported. Highest known version is 1.12.1 Client
Take the risk or lose the chance!
Password must not null in gemfire and geode, but I’ve assigned password in yaml properties file
Worries less, smile more!
One page to cover most commonly found errors for fat jar in SpringBoot
Kill time, or kiss time!
Awesome Shortcuts to boost productivity
One must learn by doing the thing; for though you think you know it, you have no certainty, until you try. —Sophocles
Core Java tips required an interview
Success is the sum of small efforts, repeated.
Tell me difference of truststore and keystore in short answer
Do what you say, say what you do.
GIT useful scripts or error solutions
Don’t wish for it, work for it.
Tell me difference of yarn install and npm install in short answer
Don’t find fault. Find a remedy.
Bible blog for most commonly found Gradle errors
People are smarter than you think. Give them a chance to prove themselves.
Pearls in Front end development
Be happy in front of people who don’t like you, it kills them.
Ruby from zero to hero
This is your life. Do what you love, and do it often.
Everything you’d know for Groovy interviews
Life is short. Don’t waste it with negative people who don’t appreciate you. Keep them in your heart but keep them out of your life.
To outstanding as professional MacBook pro user
The most effective way to do it, is to do it Homebrew The best practice is to run brew info before install new software. It will generally list what’s c...
Failed to install gem in Mac, incompatible architecture and missing psych
Burn your ego before it burns you.
IntelliJ Tips to boost your productivity 10 times
Don’t be afraid to make s splash.
Everything you’d know about state machine for interviews
Less expecting, more accepting.
Tips about algorithm resolving from Leetcode
Stay focused, believe that you can achieve at the highest level, surround yourself with others who believe in you and do not stray from your goals.
Solution center for Node errors
Fina a way. If there’s none, make one!
Triple your productivities by Visual studio code keyboard shortcuts
The sentence The quick brown fox jumps over the lazy dog uses every letter of the alphabet.
TypeScript noteworthy notes
The moment you start focusing on yourself, things start falling into place.
RXJS – reactive Programming like a hero
When love is real, it doesn’t lie, cheat, pretend or keep secrets.
Concurrency in Java
Little things make big things happens.
Linux Tips
Remember, some things have to end for better things to begin.
A taste of GraphQL
A good day starts with a good mindset!
A taste of GraphQL
A good day starts with a good mindset!
What’s inside magic in Spring Data JPA
A good day starts with a good mindset!
What’s inside magic in Spring Data JPA
A good day starts with a good mindset!
Why Spring turn a column name from camelNaming to snake_Naming
Don’t spend another year doing the same shit.
Some mistakes you’d avoid in java
With great power comes great responsibilities.
Untold stories for Jupiter, any differences JUnit 5 vs Junit 4
Don’t tell people your plans. Just show them your results!
Git commands you can show off for 100 years
Life is short, make a big splash!
FileNotFound Exception when loading data file in IntelliJ
Take time to do what makes your soul happy!
How to ace AWS certification just like play a game
Life isn’t about finding yourself. Life is about creating yourself.
Java Deep Notes
Java Deep Notes
Code to draw a Big H with all stars
Coding is everything! Code Now!
Code to draw a Big H with all stars
Coding is everything! Code Now!
Single vs Double precisions, float vs double data type
Leave nothing for tomorrow which can be done today. -Abraham Lincoln.
SkipTest-Not-Work-In-Multiple-models-project
Leave nothing for tomorrow which can be done today. -Abraham Lincoln.
SkipTest-Not-Work-In-Multiple-models-project
Leave nothing for tomorrow which can be done today. -Abraham Lincoln.
Maven error and solution on No such host is known
Don’t promis when you are hapy. Don’t reply when you’re angry and don’t decide when you’re sad Service keep on restarting If you spot service is restartin...
Maven error and solution on No such host is known
Don’t promis when you are hapy. Don’t reply when you’re angry and don’t decide when you’re sad
Gradle build stuck
Gradle build stuck, keep on running but never ending
2021
Save my eyes, let your cell phone to read screen content to you
Too much screen time
How logging system Bootstrapped in Spring Boot Application
Summary Following diagram demonstrated the process to bootstrap and use Logback for loggings in Spring Boot applciation.
SQLServer Error about This driver is not configured for integrated authentication
Symptoms When you are using integrated authentication (Kerberos connection) for MS SqlServer connection, there is one possible error :
How to copy files from resources folder in jar and save to a file
Why to extract resources from jar to local disk
Debug of SpringBoot run not working in IntelliJ
Normal approach to debug maven
How to watch specific kubenetes deployment by labels
How to watch specific kubenetes deployment by labels
Failed to talk to github.com from corporation network
Background It’s typical to get various network connection issues when you run commands within corporation network. For example, you’ll find diversed issues w...
Day-Day-Up-Java
More developer friendly Threa Sleep
How to user fire extinguisher
Summary As you know, staff and your safety is paramount. So what if emergency take place, such as fire in office, how to help yourself and your colleagues by...
Deep dive into ApplicationEvent in SpringBoot
Summary As you know, there are various event will be sent (multicast) when a specific story taken place.
2021-09-22-IT-Solutions-For-Remote-Learning
IT-Solutions-For-Remote-Learning.md
Deep dive into Kubernetes Client API
Summary To talk to K8s for getting data, there are few approaches. While K8s’ official Java library is the most widely used one. This blog will look into thi...
How to get CPU name, core, 64bit and speed in command line
Summary In windows operating system, if you want to get your CPU name, core, 64bit and speed in command line. Just follow below actions:
JetBrains/IntelliJ tips
Be a good person in real life, not in social media
Whitelabel Error Page
Summary Whitelabel Error Page is the default error page in Spring Boot web app. It provide a more user-friently error page whenever there are any issues when...
Google maps no photos reviews
Summary
谷歌地图里面照片的评论显示不出来
If you’d like to view solution in YouTube, check out at https://youtu.be/ICiwuqJ-yU8
Shall I still need booster even after I got dose 3?
The greatest wealth is health!
Debts in a nutshell
A debt security represents a debt owed by the issuer to an investor. Here, the investor acts as a lender to the issuer which may be a government, organisatio...
2020
How to process data from S3 download URL
S3 download URL As you know, AWS S3 object can be downloaded/processed by S3 download URL. I’m showing you two examples on how to process S3 Object by NIO f...
Debug Stuck IntelliJ
What happened to a debug job hanging in IntelliJ (IDEAS) IDE? You may find when you try to debug a class in Intellij but it stuck there and never proceed, e....
Awesome Kotlin
Difference with Scala Kotlin takes the best of Java and Scala, the response times are similar as working with Java natively, which is a considerable advantag...
Awesome tips for Chrome
Shortcuts & tips
JVM热身
此文是作者英文原文的翻译文章，英文原文在：http://todzhang.com/posts/2018-06-10-jvm-warm-up/
Awesome tips and shortcuts for Slack
Shortcuts for Slack
Awesome Reactive programming
Key points of Reactive Programming
Awesome Swift for iOS
Frame in Swift
Mock in kotlin
Argument Matching & Answers For example, you have mocked DOC with call(arg: Int): Intfunction. You want to return 1 if argument is greater than 5 and -1 ...
Mock in kotlin
Argument Matching & Answers For example, you have mocked DOC with call(arg: Int): Intfunction. You want to return 1 if argument is greater than 5 and -1 ...
Docker
Dockers Concepts
How to decode path parameters in All REST WebServices calls
How to decode path parameters in All REST WebServices calls
Curl
Linux Curl command
AOP
The concept of join points as matched by pointcut expressions is central to AOP, and Spring uses the AspectJ pointcut expression language by default.
Micrometer notes
As a general rule it should be possible to use the name as a pivot. Dimensions allow a particular named metric to be sliced to drill down and reason about th...
Pigeons in holes principle
# Pigeonhole principle
Awesome solutions for algorithm questions
你就会发现只要涉及递归的问题，都是 树的问题。
A Facial Recognition utility in a dozen of LOC
A Facial Recognition utility in a dozen of python LOC (Lines Of Code)
Awesome SSL certificates and HTTPS
What’s TLS TLS (Transport Layer Security) and its predecessor, SSL (Secure Sockets Layer), are security protocols designed to secure the communication betwee...
JVM warm up by Escape Analysis
Why JVM need warm up I don’t know how and why you get to this blog. But I know the key words in your mind are “warm” for JVM. As the name “warm up” suggested...
Java Concurrent Column 2
This is the second half about Java Concurrent of my blog
Java Concurrent
This blog is about noteworthy pivot points about Java Concurrent Framework Back to Java old days there were wait()/notify() which is error prone, while fr...
Algorithm notes from Leecode – 1
Algorithm Leetcode
2019
Conversations with God
Feelings is the language of the soul. If you want to know what’s true for you about something, look to how your’re feeling about.
Kafka In Spring
Enable Kafka listener annotated endpoints that are created under the covers by a AbstractListenerContainerFactory. To be used on Configuration classes as fol...
Terraform
Why Terraform
Kafka
Kafka
Mifid
FX Spot is not covered by the regulation, as it is not considered to be a financial instrument by ESMA, the European Union (EU) regulator. As FX is considere...
Foreign Exchange
currency pairs Direct ccy: means USD is part of currency pair Cross ccy: means ccy wihtout USD, so except NDF, the deal will be split to legs, both with...
2018
Seconds
nano seconds
Citrix receiver
Simple Binary Encoding (SBE)
Citrix receiver
“Cannot connect to remote desktop” with Citrix Receiver
Guice
A new type of Juice Put simply, Guice alleviates the need for factories and the use of new in your Java code. Think of Guice’s @Inject as the new new. You wi...
YAML
Key points All YAML files (regardless of their association with Ansible or not) can optionally begin with — and end with …. This is part of the YAML format a...
Distruptor
multithreading
Mockito
Feature
Protobuf
What are protocol buffers?
Sudo in a Nutshell
Sudo in a Nutshell Sudo (su “do”) allows a system administrator to give certain users (or groups of users) the ability to run some (or all) commands as root...
Zoo-keeper
ZK Motto the motto “ZooKeeper: Because Coordinating Distributed Systems is a Zoo.”
Presto DB
WHAT IS PRESTO?
Chronicle
Overview
Cucumber
Acceptance testing vs unit test It’s sometimes said that unit tests ensure you build the thing right, whereas acceptance tests ensure you build the right thi...
Scala
Scala String
akka framework of scala
philosophy The actor model adopts the philosophy that everything is an actor. This is similar to the everything is an object philosophy used by some object-o...
File Util in Apache Camel
FileUtil.class
Apache Camel
Camel’s message model In Camel, there are two abstractions for modeling messages, both of which we’ll cover in this section. org.apache.camel.Message—The ...
QuickFixJ
Settings
JXM
Exporting your beans to JMX The core class in Spring’s JMX framework is the MBeanExporter. This class is responsible for taking your Spring beans and registe...
Solace MQ
Solace PubSub+ It is a message broker that lets you establish event-driven interactions between applications and microservices across hybrid cloud environmen...
Apigee
App deployment, configuration management and orchestration - all from one system. Ansible is powerful IT automation that you can learn quickly.
Ansible
Ansible: What Is It Good For? Ansible is often described as a configuration management tool, and is typically mentioned in the same breath as Chef, Puppet, a...
flexbox
How Flexbox works — explained with big, colorful, animated gifs
Jboss tips
commands:
Locking and multithreading
Single Writer principle
KDB
KDB However kdb+ evaluates expressions right-to-left. There are no precedence rules. The reason commonly given for this behaviour is that it is a much simple...
Foreign Exchange
Foreign Exchange markets
Portactor
Better to use smart wait
Agile and SCRUM
Key concept In Scrum, a team is cross functional, meaning everyone is needed to take a feature from idea to implementation.
DevOps-Philosophy
:100:DevOps Model Defined
rxjs pipe in depth
https://stormforger.com/blog/2016/07/08/types-of-performance-testing/
How to setup nodejs to install package from intranet
Error of ‘ECONNRESET’ You may face error ECONNRESET from intranet, even appropriate proxy tools (e.g. cntlm) is running. The errors may looks like ```bash $ ...
Strategy-Of-Openshift-Releases
Release & Testing Strategy There are various methods for safely releasing changes to Production. Each team must select what is appropriate for their own ...
NodeJs Notes
commands to read files var lineReader = require(‘readline’).createInterface({ input: require(‘fs’).createReadStream(‘C:\dev\node\input\git_reset_files.tx...
Minium Viable Product
https://blog.leanstack.com/minimum-viable-product-mvp-7e280b0b9418
What is difference between declarations, providers and import in NgModule
What is difference between declarations, providers and import in NgModule
CORS :Cross-Origin Resource Sharing
Cross-Origin Request Sharing - CORS (A.K.A. Cross-Domain AJAX request) is an issue that most web developers might encounter, according to Same-Origin-Policy,...
ngrx
Why @Effects? In a simple ngrx/store project without ngrx/effects there is really no good place to put your async calls. Suppose a user clicks on a button or...
iOS programming
View A view is also a responder (UIView is a subclass of UIResponder). This means that a view is subject to user interactions, such as taps and swipes. Thus,...
2017
cloud computering
openshift vs openstack The shoft and direct answer is `OpenShift Origin can run on top of OpenStack. They are complementary projects that work well together....
cloud computering
Concepts Cloud computing is the on-demand demand delivery of compute database storage applications and other IT resources through a cloud services platform v...
Redux
whats @Effects You can almost think of your Effects as special kinds of reducer functions that are meant to be a place for you to put your async calls in suc...
reactive programing
The second advantage to a lazy subscription is that the observable doesn’t hold onto data by default. In the previous example, each event generated by the in...
common errors in NPM or node
code E503 code E503 when run npm install packages, e.g.
Container
The Docker project was responsible for popularizing container development in Linux systems. The original project defined a command and service (both named do...
promise vs observiable
The drawback of using Promises is that they’re unable to handle data sources that produce more than one value, like mouse movements or sequences of bytes in ...
Openshift tips
Commands bible
google analysis
How Page Value is calculated
JDK source
interface RandomAccess Marker interface used by List implementations to indicate that they support fast (generally constant time) random access. The primary ...
SSH SFTP
Secure FTP SFTP over FTP is the equivalant of HTTPS over HTTP, the security version
Setup WebSphere profiles and application in command line
Setup WebSphere profiles and application in command line
AWS Tips
After establishing a SSH session, you can install a default web server by executing sudo yum install httpd -y. To start the web server, type sudo service htt...
Oracle
ORA-12899: Value Too Large for Column
Spring notes
Spring Bean Life Cycle Callback Methods
Kindle notes
#《亿级流量网站架构核心技术》目录一览 TCP四层负载均衡 使用Hystrix实现隔离 基于Servlet3实现请求隔离 限流算法 令牌桶算法 漏桶算法 分布式限流 redis+lua实现 Nginx+Lua实现 使用sharding-jdbc分库分表 Disruptor+Redis...
Java JIT compiler
This is talking about Java JIT (Just-In-Time) compiler
Java Security Notes
Java Security well-behaved: programs should be prevent from consuming too much system resources
SeriableVersionUID
Noteworthy points about SeriableVersionUID in Java
R Language
s<-read.csv("C:/Users/xxx/dev/R/IRS/SHH_SCHISHG.csv") # aggregate s2<-table(s$Original.CP) s3<-as.data.frame(s2) # extract by Frequency ordered s3...
SSH and Cryptography
SFTP versus FTPS SS: Secure Shell An increasing number of our customers are looking to move away from standard FTP for transferring data, so we are ofte...
Eclipse notes
How do I remove a plug-in? Run Help > About Eclipse > Installation Details, select the software you no longer want and click Uninstall. (On Macintosh i...
Java JVM
Class loading subsystem
Maven-Notes
Maven philosophy “It is important to note that in the pom.xml file you specify the what and not the how. The pom.xml file can also serve as a documentatio...
Java New IO
Notes JDK 1.0 introduced rudimentary I/O facilities for accessing the file system (to create a directory, remove a file, or perform another task), accessi...
Network Protocols
Net Protocols
IT-Architect
SOA SOA is a set of design principles for building a suite of interoperable, flexible and reusable services based architecture. top-down and bottom-up a...
Algorithm
This page is about key points about Algorithm
Dead Lock
Concept
Java-Tricky-Tech-Questions.md
What is the difference between Serializable and Externalizable in Java? In earlier version of Java, reflection was very slow, and so serializaing large ob...
NavigableMap Misc
What is NavigableMap
Compare-In-Java
Concepts If you implement Comparable interface and override compareTo() method it must be consistent with equals() method i.e. for equal object by equals(...
Java Collections Misc
Difference between equals and deepEquals of Arrays in Java Arrays.equals() method does not compare recursively if an array contains another array on oth...
HashMap in JDK
Hashmap in JDK Some note worth points about hashmap Lookup process Step# 1: Quickly determine the bucket number in which this element may resid...
Java 8 Tips
This blog is listing key new features introduced in Java 8
Arbitrage vs Heading
What is the difference between arbitrage and hedging?
Java Enum Misc
Enum Misc
2016
Java GC notes
verbose:gc verbose:gc prints right after each gc collection and prints details about each generation memory details. Here is blog on how to read verbose gc
Hash Code Misc
contract of hashCode : Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consis...
Apache Tips
Apache
Angulary Misc
Dependency Injection Angular doesn’t automatically know how you want to create instances of your services or the injector to create your service. You must co...
Random number in java
ThreadLocalRandom, SecureRandm, java.util.Random, java.math.Random
Java new features
JDK Versions JDK 1.5 in 2005 JDK 1.6 in 2006 JDK 1.7 in 2011 JDK 1.8 in 2014 Sun之前风光无限，但是在2010年1月27号被Oracle收购。 在被Oracle收购后对外承诺要回到每2年一个realse的节奏。但是20...
用10几行代码自己写个人脸识别程序
用10几行代码自己写个人脸识别程序
Eslastic Search
Eslastic Search
JSON lines
JSON lines
Python Scraphy
Python Scraphy
Simpler chronicle of CI(Continuous Integration) “乱弹系列”之持续集成工具
引言 有句话说有人的地方就有江湖，同样，有江湖的地方就有恩怨。在软件行业历史长河（虽然相对于其他行业来说，软件行业的历史实在太短了，但是确是充满了智慧的碰撞也是十分的精彩）中有一些恩怨情愁，分分合合的小故事，比如类似的有，从一套代码发展出来后面由于合同到期就分道扬镳，然后各自发展成独门产品的Sybase DB和微...
Head First Blockchina 3
Hyperledger Fabric for Mortals
【原创】深入浅出区块链系统：第二章
使用Solidity创建以太坊(Ethereum)智能合约(Smart Contract)
How to customize Sublime syntax highlights
Reference Sublime Scope Naming Syntax Guide
浅谈软件单元测试中的“断言” (assert)，从石器时代进步到黄金时代。
大家都知道，在软件测试特别是在单元测试时,必用的一个功能就是“断言”（Assert)，可能有些人觉得不就一个Assert语句，没啥花头，也有很多人用起来也是懵懵懂懂，认为只要是Assert开头的方法，拿过来就用。一个偶然的机会跟人聊到此功能，觉得还是有必要在此整理一下如何使用以及对“断言”的理解。希望可以帮助大家...
Head First Blockchina 1
深入浅出区块链系统：第一章. what you should know about blockchain
Kubernetes 与 Docker Swarm的对比
Kubernetes 和Docker Swarm 可能是使用最广泛的工具，用于在集群环境中部署容器。但是这两个工具还是有很大的差别。
漫谈开发设计中的一些‘原则’及’设计哲学’
在开发设计中有一些常用原则或者潜规则，根据笔者的经验，这里稍微总结一下最最常用的，以飨读者。
http methods
RFC origion http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.1.2)
Spark-vs-Storm
The stark difference among Spark and Storm. Although both are claimed to process the streaming data in real time. But Spark processes it as micro-batches; wh...
微服务
可以想像一下，之前的传统应用系统，像是一个大办公室里面，有各个部门，销售部，采购部，财务部。办一件事情效率比较高。但是也有一些弊端，首先，各部门都在一个房间里。
unmodifiableList, unmodifiableSet,unmodifiableMap
What’s it Returns an unmodifiable view of the specified set. This method allows modules to provide users with “read-only” access to internal sets. Query ope...
kibana, view layer of elasticsearch
What’s Kibana kibana is an open source data visualization plugin for Elasticsearch. It provides visualization capabilities on top of the content indexed on...
kibana, view layer of elasticsearch
What’s Kibana kibana is an open source data visualization plugin for Elasticsearch. It provides visualization capabilities on top of the content indexed on...
Anatomy of ThreadLocal
Design philosophies
iConnect
UI HTML5, AngularJS, BootStrap, REST API, JSON Backend Hadoop core (HDFS), Hive, HBase, MapReduce, Oozie, Pig, Solr
Business Analysis
Purpose of BA 带来一些商业价值（收益） 解决业务痛点
Something about RESTful architect
REST API must be hypertext driver Roy’s interview
Data Structure
Binary Tree A binary tree is a tree in which no node can have more than two children. A property of a binary tree that is sometimes important is that th...
Useful bookmarks
eBooks list of various books Node.js
heavy load web application
Common solutions
tips in as400 IBM Emulator
Toggle crosshair
Mysql operator to extract JSON
“Be the change you wish to see in the world.” - Mahatma Gandhi
equity trading
Difference between mutal funds and hedge funds
SQL
Differences between not in, not exists , and left join with null
HTTPS/2
concepts
Github page commands notes
404 error for customized domain (such as godday) 404 There is not a GitHub Pages site here. Go to github master branch for gitpages site, manually add CN...
RenMinBi International
RQFII RQFII stands for Renminbi Qualified Foreign Institutional Investor. RQFII was introduced in 2011 to allow qualified foreign institutional investors to ...
JavaScript tips
includes() vs some()
Docker Errors and Fixes
Docker Errors
Load Balancing
Concepts LVS means Linux Virtual Server, which is one Linux built-in component.
Python
(‘—–Unexpected error:’, <type ‘exceptions.TypeError’>) datetime.datetime.now()
Storage Management
RAID RAID is Reductant Array Independent Disk,
CI and CD
Concepts
XA Transactions in 2PC
Description
Setup Git in Mint Linux
How to setup Git in Mint Linux =================================================
Database sharding
DB sharding in YHD
Microservices vs. SOA
Microservice Services are organized around capabilities, e.g., user interface front-end, recommendation, logistics, billing, etc. Services are small in ...
Java Class Loader
Codecache The maximum size of the code cache is set via the -XX:ReservedCodeCacheSize=N flag (where N is the default just mentioned for the particular com...