シャドーイング練習: NGINX Explained - What is Nginx - 動画で英語スピーキングを学ぶ
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By the end of this video, you will know not only what Nginx is,
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but also why it was created and what it's used for with real life examples.
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Back in the day when the web was still simple with less users, the basic use case was a browser requested a web page from one web server.
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The web server was a server machine that had a software installed on it
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that assembled the page and sent it back to the browser, which then displayed it to the user a piece of software
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that runs on a server machine and can respond to requests from a browser.
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And that web server software, that was Nginx, a piece of software that runs on a server machine and can respond to requests from a browser.
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Then web became popular, so you had thousands or millions of requests per website.
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Imagine one single server handling millions of requests.
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That's way over the technical limit of a server software.
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Well, we need a few more servers to handle that load.
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So we added 10 Nginx web servers.
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But now we need something that determines where requests from the browser and which one of those 10 servers will handle them.
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And that's where load balancing comes in.
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So the same Nginx web server becomes a load balancer that proxies the requests to those 10 web servers.
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And by the way, the word proxy means to do something on someone else's behalf.
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So it accepts the browser requests on behalf of the web servers.
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like a concierge
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and then distributes the load among the web servers now how does it distribute the load
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that depends on whichever algorithm was configured on it it could
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be a simple logic such as just whichever server is least busy gets the request
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or it could be a round robin which is a popular algorithm
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that basically distributes the requests equally in a cyclical manner So very simple load balancing logic.
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So now we have Nginx as web server software.
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and the proxy as well and
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that load balancing is just one of the functionalities of nginx proxy
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so it's the same server and technology but with a different task now
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so what are those other features or functionalities of a proxy
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Imagine New York Times article comes out and millions of people open it on their laptops in the browser.
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Now imagine every time the request landed with one of the web servers that assembled the response,
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like put the images together, get them from a database, put text and paragraphs and everything together, edit all the links, sent it back as a response.
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to assemble this article, get all the data from a database, put the text and links and everything together once and store it.
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It's a static article, it's not going to change, right?
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So just keep one final copy and send it to everyone who requests it.
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That's caching functionality and it is another main feature of Nginx Proxy server.
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So you can configure caching on Nginx Proxy
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so you don't have to hit the database or the web servers every time a request comes in.
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It will just return that cached file.
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Now imagine we have 100 servers of an online banking application or a social network like Facebook.
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That makes those servers a pretty juicy target for hackers.
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They all want to hack into your servers and get the treasure, which is payment data, personal data, passwords, and so on.
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Now imagine you exposed all 100 servers to public access.
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So basically all those requests can directly hit each of the web servers.
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hackers so much easier.
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They would need to find just one issue in one of those hundred servers, and they could potentially break into your entire system.
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Because all your servers are publicly accessible directly, they can just ping the hell out of them
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and probe them until they find an issue or an entry because you forgot to update a library or a software package, and they can hack your web server application.
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So you have to worry about absolutely perfectly securing hundred servers.
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Instead, we just give them one server.
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That is the only one that's publicly accessible.
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You can put all your tightest security efforts on one server instead of 100 servers.
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And this way having one entry point, which is the proxy, as publicly accessible entry point,
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reduces the security attack surface tremendously and basically acts like a shield or security layer before all those web servers.
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So in addition to load balancing and caching,
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a very, very important functionality of a proxy is an edit security for your web servers.
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Now talking about security, I mentioned that since we have one entry point, we can focus all our efforts to securing that one proxy server in all aspects.
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And one important security measure is encrypted communication.
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So front -end will send encrypted message to the proxy, which means even if an attacker sees that traffic on user's browser or during the transmission, they can't read it.
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Only the proxy server can decrypt it.
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But again, for edit security in many systems, proxy that acts as a shield,
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a security shield, will simply pass on that encrypted message to the web servers and the web server will decrypt it.
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itself which is actually a better security practice.
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So here the functionality of a proxy is to be able to accept encrypted traffic with SSL encryption.
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So you can configure your proxy to deny any requests that is not encrypted and only accept encrypted requests.
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Now imagine Netflix, which by the way uses Nginx in its backend.
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And as we know, Netflix has millions of users, so it's getting millions of requests for videos on its web servers.
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And let's say it's an evening in New York, millions of people come home after work, All at the same time,
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they switch on Netflix and start watching the most popular series at that time.
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That means suddenly at the very same time, millions of requests for a high quality video is sent to Netflix.
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So in this case, imagine
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that Nginx proxy server would have to send back the entire high quality video to millions of users at once.
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That's a lot of bandwidth.
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internet cables all the way to the TVs of millions of viewers.
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That's where compression helps nginxproxy can also be configured to compress large images
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or video files to save bandwidth both on the side of the clients
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so people who are receiving those large files
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but also on the server side who is sending all
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that content so it arrives faster and it uses up less of your internet bandwidth
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and as part of it it also supports sending responses in chunks instead of the entire
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part of the video and then by the time you have watched the first half, the second half of the video has been sent over to you as well.
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So these are all the functionalities that you can configure for Nginx as a proxy server.
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Now, you may be thinking, how do you make Nginx do all these things?
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How do you configure them?
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How do you tell Nginx whether it should act as a web server or a proxy server?
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And how do you configure all this caching and SSL traffic and all this stuff?
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Well, that's where Nginx configuration file comes in, which lets you define all this configuration with so -called directives.
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This is where you can define whether you want your Nginx to be a web server or a proxy server,
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simply by configuring whether it should forward the traffic to other web servers or whether it should handle it itself.
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You can configure which port you want Nginx server to listen on.
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This is an example of a simple web server configuration
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that listens on port 80
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and with location basically defines from where in the file system it should serve those static files back but as we learned,
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communicating on port 80 or HTTP port is insecure.
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Instead, we want to encrypt all the communication.
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And you can configure
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that easily in Nginx to route any traffic coming on port 80 to HTTPS by sending those requests to HTTPS endpoint.
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key and the private key for the SSL communication and it listens on the HTTPS port 443.
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So that's a simple configuration that allows you to tweak Nginx to handle requests like that.
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You also have its own configuration to configure load balancing to multiple backend servers
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and within that configuration you can also define which load balancing algorithm to use like select the least which as I said,
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just equally distributes the load in a cyclical order between those servers.
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You also have the caching configuration with multiple different elements, like how long the cache should be stored before it's refreshed and so on.
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And as you see, the configuration of all these functionalities is pretty straightforward, and it's also pretty granular.
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Like you can do tons of different configurations with Nginx, directives in this list here,
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which is a pretty huge list, and you see the configurations for proxy functionalities have proxy prefix, so you can differentiate them as well.
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Now, Nginx is very flexible, as you see, and super fast as well.
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So it became very popular in containers as well
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and made its way as one of the most popular solutions for Kubernetes Ingress Controller functionality.
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Ingress Controller is essentially a proxy with advanced load balancing functionality, but for Kubernetes.
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So what Nginx was doing for simple web servers, it's now doing for Kubernetes Cluster in the form of Ingress Controller.
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proxy and load balancer that receives the incoming traffic first and then based on the configuration that we define,
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forwards it to the right service inside the cluster.
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Now, this load balancing configuration as well as the logic is more advanced and more Kubernetes specific, but the idea is pretty much the same.
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And I actually have full videos on Ingress and Ingress controller and how to configure it.
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You can watch on my channel.
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In fact, I create these tutorials regularly on a lot of interesting technology.
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So if you want to educate yourself in tech, make sure to subscribe and activate notification to get those new tutorial videos.
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Now there are actually many English controller implementations out there for Kubernetes but Nginx is one of the most popular ones.
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And I have actually used Nginx Ingress Controller in most of my projects as well.
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Now, some of you may be thinking, doesn't each cloud platform have its own load balancer?
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Why do I need Nginx as a load balancer?
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Well, you actually need both.
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Nginx Ingress Controller, which acts as a load balancer, is used inside the cluster.
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accessible so you can't access the nginx ingress controller directly from the browser it actually lives inside the cluster network
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and forwards the requests internally
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so who is getting the requests from public what is the
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public entry point for the browser requests that's the cloud load balancer like aws elb for example
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which then forwards that request to the ingress controller inside the very important security layer to those requests.
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So the cluster component is never directly exposed to public access.
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Instead, every request comes from the cloud load balancer, which then forwards it to the Ingress controller within the cluster,
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which then routes the traffic based on intelligent logic to different applications within the cluster.
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And with intelligent routing, what I mean is, of sub -segments or microservices, for example, you can configure your English controller.
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So if the request URL includes Online cart, it routes the traffic to online cart microservice.
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If it includes payment, it routes the traffic to payment service and so on.
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Now, some of you who've been in IT for a little longer may have worked with Apache web server.
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So what's the difference between Apache web server and Nginx web server?
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Well, not much, actually.
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Nginx and Apache web servers do pretty much the same thing.
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Just like Nginx, Apache also used to be a basic web server,
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extended its functionality as a proxy and it has all these benefits and functionalities of a proxy that we discussed.
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Apache was actually already widely used when Nginx was created and the major benefit of Nginx was that it was faster,
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more lightweight and definitely had an advantage when it came to serving huge amounts of static files.
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Plus, as you saw, it has a pretty easy configuration as well.
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And Nginx also became more popular in the container world.
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Now, I hope you got a clear overview of what Nginx is
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and hope I've answered all the questions you may have had while learning about Nginx.
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And with that, thank you for watching and see you in the next video.
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コンテキストと背景
このビデオでは、Nginxの基本的な機能や、その背後にある理由、具体的な利用例について解説されています。元々、ウェブはシンプルで、ユーザーも少なく、ブラウザが一つのウェブサーバーからウェブページを要求するという基本的な流れがありました。しかし、ウェブの人気が高まるにつれ、同時に処理するリクエストが数百万件になることもありました。これに対処するために、Nginxは複数のサーバー間でのリクエストの分散を行うローディングバランサーとしても機能します。このような技術的内容を理解することは、英語学習者にとっても新しい専門用語や表現を学ぶ良い機会となります。
日常コミュニケーションに役立つトップ5フレーズ
- “What is Nginx?” - Nginxとは何か？
- “Handle requests” - リクエストを処理する
- “Load balancing” - ロードバランシング
- “Caching functionality” - キャッシング機能
- “Publicly accessible” - 公開アクセスの可能性
これらのフレーズは、テクノロジーに関する会話において頻繁に使用される表現です。特に、YouTubeで英語学習をしている際に、こうしたフレーズを理解し、使うことができれば、よりスムーズなコミュニケーションが図れるでしょう。
段階的シャドウイングガイド
このビデオの内容を効果的に学ぶために、次のステップに従ってみましょう：
- ビデオを数回観る：最初に内容を把握するために、完全に視聴し、Nginxに関する基本的な情報を理解します。
- フレーズを抽出：日常コミュニケーションで使用できるフレーズをリストアップし、それらの意味を確認します。
- シャドウイングの実践：選んだフレーズを発音しながら、ビデオの音声に合わせてみましょう。shadowspeakを用いれば、発音やイントネーションの練習がより効果的になります。
- 再度視聴：フレーズをシャドウイングした後、再度ビデオを見て、理解が深まっているか確認します。
- アウトプットの練習：友人や学習グループと一緒に、学んだフレーズを使って会話を練習しましょう。英語スピーキング練習にも役立ちます。
このプロセスを通じて、特にIELTS スピーキング対策やスピーキング能力の向上に成功するでしょう。ビデオで学ぶ内容を自分の言葉で表現できるようになることが目標です。
この動画の文法
話し手がよく使っている文型を、動画の実際の表現とともに紹介します。
| 文型 | 動画での表現 |
|---|---|
| 受動態 be + 過去分詞 — 誰がするかより、何が起きるかに焦点を当てる | was created · was configured · is encrypted |
| 関係詞節 who / which + 節 — 人や物について情報を加える | robin which is · everyone who requests · treasure, which is |
| 現在完了形 have/has + 過去分詞 — 過去の出来事が今も関係している | have watched · who've been · I've answered |
シャドーイングとは？英語上達に効果的な理由
シャドーイング（Shadowing）は、もともとプロの通訳者養成プログラムで開発された言語学習法で、多言語習得者として知られるDr. Alexander Arguelles によって広く普及されました。方法はシンプルですが非常に効果的：ネイティブスピーカーの英語を聞きながら、1〜2秒の遅延で声に出してすぐに繰り返す——まるで「影（shadow）」のように話者を追いかけます。文法ドリルや受動的なリスニングと異なり、シャドーイングは脳と口の筋肉が同時にリアルタイムで英語を処理・再現することを強制します。研究により、発音精度、抑揚、リズム、連音、リスニング力、そして会話の流暢さが大幅に向上することが確認されています。IELTSスピーキング対策や自然な英語コミュニケーションを目指す方に特におすすめです。