Kubernetes クラスタとは？をわかりやすく解説

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class="custom-nav-overview-body">以下のプロバイダーに支払う確約利用料で、Red Hat ソリューションを購入できます。 <img src="https://www.redhat.com/rhdc/managed-files/cloud-providers-2x.png" alt="クラウドプロバイダー：Amazon Web Services、Microsoft Azure、Google Cloud" ></span></a></li></ul></div></div><div class="pfe-navigation--column nav-card-lg"><div class="pfe-link-list"><div class="pfe-link-list--header "><h3 data-analytics-category="Products" data-analytics-text="Featured" class="link-header nolink">注目のコースと認定</h3></div><ul class="pfe-link-list--group"><li class="pfe-link-list--group-item"><a class="custom-nav-link" data-analytics-category="Products|Featured" data-analytics-text="Red Hat Enterprise Linux AI" href="/ja/technologies/linux-platforms/enterprise-linux/ai" > Red Hat Enterprise Linux AI </a></li><li class="pfe-link-list--group-item"><a class="custom-nav-link" data-analytics-category="Products|Featured" data-analytics-text="Red Hat OpenShift AI" href="/ja/technologies/cloud-computing/openshift/openshift-ai" > Red Hat 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class="custom-nav-overview-body">Red Hat의 오픈소스 플랫폼을 활용하여 AI 모델과 애플리케이션을 빌드, 배포, 모니터링하세요. </span></a></li><li class="pfe-link-list--group-item"><a class="custom-nav-overview-link" data-analytics-category="Solutions" data-analytics-text="Edge computing" href="/ja/products/edge" ><span class="custom-nav-overview-title">エッジコンピューティング</span><span class="custom-nav-overview-body">セキュリティ重視のエッジ・テクノロジーを活用し、ワークロードをデータの発生源近くにデプロイします。 </span></a></li></ul></div></div><div class="pfe-navigation--column"><div class="pfe-link-list"><ul class="pfe-link-list--group"><li class="pfe-link-list--group-item"><a class="custom-nav-overview-link" data-analytics-category="Solutions" data-analytics-text="IT automation" href="/ja/solutions/it-automation" ><span class="custom-nav-overview-title">IT 自動化</span><span class="custom-nav-overview-body">包括的な自動化プラットフォームを使用し、統合されていないテクノロジー、チーム、環境を統合します。 </span></a></li><li class="pfe-link-list--group-item"><a class="custom-nav-overview-link" 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class="custom-nav-overview-body">仮想化ワークロードとコンテナ化ワークロードのための単一のプラットフォームで、運用をモダナイズします。 </span></a></li></ul></div></div><div class="pfe-navigation--column nav-card"><div class="pfe-link-list"><div class="pfe-link-list--header nolink"><h3 data-analytics-category="Solutions" data-analytics-text="By industry" class="link-header nolink">業種別</h3></div><ul class="pfe-link-list--group"><li class="pfe-link-list--group-item"><a class="custom-nav-link" data-analytics-category="Solutions|By industry" data-analytics-text="Automotive" href="/ja/solutions/automotive" > 自動車 </a></li><li class="pfe-link-list--group-item"><a class="custom-nav-link" data-analytics-category="Solutions|By industry" data-analytics-text="Financial services" href="/ja/solutions/financial-services" > 金融サービス </a></li><li class="pfe-link-list--group-item"><a class="custom-nav-link" data-analytics-category="Solutions|By industry" data-analytics-text="Healthcare" href="/ja/solutions/healthcare" > 医療 </a></li><li 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stroke="black"/></svg><li class="rh-navigation-link-container"> Kubernetes クラスタとは </li></ul> </div> <div class="rhdc-article-hero-headline dx-mb-4 dx-mt-4">  <div class="rh-band-header--component" ><h1 class="rh-band-header-hero-headline" >Kubernetes クラスタとは</h1> </div> </div> <div class="rhdc-article-hero-front-matter">  <div class="rh-front-matter--component"><div class="rh-front-matter-wrapper" data-rh-layout="inline-horizontal"><div class="rh-front-matter-metadata"><span class="rh-front-matter-metadata-publish-date">掲載 <span> 2024年 2月 13日</span></span><span class="rh-front-matter-metadata-separator">•</span><span class="rh-front-matter-metadata-readtime" for="article-contents" data-rh-hidden="sm"><em class="placeholder">5</em> 分 (読了時間の目安)</span></div><pfe-clipboard class="rh-front-matter-share" role="button" tabindex="0"><span slot="text">URL をコピー</span></pfe-clipboard></div></div></div> </div> <div class="lg:dx-col-3"> </div> </div> </section> <section class="dx-band dx-pt-0 rhdc-article-body" id="rhdc-aside-promo"> <div class="dx-container dx-flex-col lg:dx-flex lg:dx-flex-row xl:dx-gap-3 lg:dx-justify-between"> <div class="lg:dx-col-1 lg:dx-col-2 dx-mb-6 lg:dx-mb-0"> <pfe-jump-links-nav id="article-nav" autobuild offset="120" sr-text="セクションを選択" ></pfe-jump-links-nav> </div> <div class="rhdc-article-body--content lg:dx-col-6"> <pfe-jump-links-panel scrolltarget="article-nav" data-rh-layout="tall-stacked" pfelement="" class="PFElement" type="content">  <div class="rh-group--layout" data-rh-layout="stacked" ><div class="rh-group-body" data-rh-layout="min-stacked" ><header class="rh-standard-header--component" ><div class="rh-standard-header-container"><h2 class="rh-standard-header-headline-medium pfe-jump-links-panel__section" id="概要" nav-label="概要" >概要</h2></div></header><div class="rh-generic--component" ><p>Kubernetes (k8s) クラスタは、コンテナ化されたアプリケーションを実行するノードの集合体です。オンプレミス、クラウド、物理/仮想マシン等、複数の環境をまたいでコンテナを実行します。Kubernetes を実行しているときは、クラスタが実行されています。</p><p><rh-cta variant="primary"><a href="/ja/resources/16-steps-to-production-ready-kubernetes-clusters-whitepaper" data-analytics-linktype="cta">Kubernetesクラスタをビルドするための 16 のステップ</a></rh-cta></p><p>クラスタには少なくとも、1 つのコントロールプレーンと、1 つ以上のノードと呼ばれるコンピューティングマシンが含まれます。コントロールプレーンの役割は、どのアプリケーションが実行されているか、どのコンテナイメージが使用されているかといった、クラスタの望ましい状態を維持することです。ノードは実際にアプリケーションとワークロードを実行します。</p><p>クラスタは <a href="/ja/topics/containers/what-is-kubernetes">Kubernetes</a> の主要な利点、つまりオンプレミスまたはクラウド内の物理マシンや仮想マシンのグループ全体でコンテナをスケジュールして実行する機能の中核をなすものです。Kubernetes <a href="/ja/topics/containers/whats-a-linux-container">コンテナ</a>は個々のマシンに関連付けられておらず、クラスタ全体で抽象化されています。</p><div class="rc-cta-secondary"><rh-cta variant="primary"><a href="/ja/resources/container-strategy-kubernetes-ebook" data-analytics-linktype="cta">Kubernetes ベースのコンテナ戦略で競争力を獲得する</a></rh-cta></div></div></div></div>  <div class="rh-group--layout" data-rh-layout="stacked" ><div class="rh-group-body" data-rh-layout="min-stacked" ><header class="rh-standard-header--component" ><div class="rh-standard-header-container"><h2 class="rh-standard-header-headline-medium pfe-jump-links-panel__section" id="クラスタの使い方" nav-label="クラスタの使い方" >Kubernetes クラスタの使い方</h2></div></header><div class="rh-generic--component" ><p>各 Kubernetes クラスタでは望ましい状態 (desired state) として、どのアプリケーションまたは他のどのワークロードを実行する必要があるか、どのイメージを使用するか、どのリソースを利用できるようにするべきかといった構成の詳細が定義されています。</p><p>望ましい状態は、マニフェスト (実行するアプリケーションのタイプと正常なシステム実行のために必要なレプリカ数を宣言する JSON または <a href="/ja/topics/automation/what-is-yaml">YAML</a> ファイル) の集合である構成ファイルによって定義されます。</p><p>クラスタの望ましい状態は、<a href="/ja/topics/containers/what-is-the-kubernetes-api">Kubernetes API</a> で定義します。これは、コマンドラインから (kubectl を使用)、あるいは API を使用してクラスタと通信し、望ましい状態を設定または変更することで実行できます。</p><p>Kubernetes は、クラスタを自動的に管理して望ましい状態に一致させます。簡単な例として、望ましい状態を「3」に設定してアプリケーションをデプロイするとします。この設定は、アプリケーションの 3 つのレプリカが実行されている必要があることを表します。これらのコンテナの 1 つがクラッシュした場合、Kubernetes は、実行されているレプリカが 2 つだけだということを認識し、レプリカを 1 つ追加して望ましい状態を保持します。</p><p><a href="/ja/topics/cloud-native-apps/introduction-to-kubernetes-patterns">Kubernetes パターン</a>を使用し、負荷に基づいてクラスタのスケールを自動的に管理することもできます。 </p><h3>ノード、Pod、その他の Kubernetes 用語とクラスタとの関連</h3><p>クラスタは、ノードのセットであると定義しました。クラスタの機能を理解するのに役立つ他の Kubernetes 用語をいくつか見てみましょう。</p><p><strong>コントロールプレーン：</strong>Kubernetes ノードを制御する一連のプロセス。すべてのタスクの割り当てはここで発生します。</p><p><strong>ノード：</strong>要求に基づいてコントロールプレーンによって割り当てられたタスクを実行するマシン。</p><p><strong>Pod：</strong>1 つのノードにデプロイされた、1 つ以上のコンテナのセット。Pod は、最小かつ最も単純な Kubernetes オブジェクトです。</p><p><strong>サービス：</strong> 一連の Pod で実行されているアプリケーションをネットワークサービスとして公開する方法。Pod から作業の定義を分離します。</p><p><strong>ボリューム：</strong>Pod 内のコンテナにアクセスできるデータを含むディレクトリ。Kubernetes ボリュームの寿命は、それを包含する Pod と同じです。ボリュームは、Pod 内で実行されるどのコンテナよりも長く存続し、コンテナが再起動してもデータは保持されます。</p><p><strong>Namespace：</strong>仮想クラスタ。Namespace により、Kubernetes は同じ物理クラスタ内の (複数のチームまたはプロジェクトの) 複数のクラスタを管理できます。</p></div></div></div> <div class="rhdc--inline-promo" data-rh-mbox="inline-promo">  <div class="rh-card--layout rh-promo-article" 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を併用することで、パブリッククラウド、オンプレミス、エッジ環境など、複数のリージョンにまたがる複数の Kubernetes クラスタを効率的にデプロイし、管理できます。</p><p><rh-cta><a href="/ja/resources/containers-clusters-and-event-driven-automation-overview" data-entity-type="node" data-entity-uuid="67d31513-3d85-4b8d-84b1-9c688233bb4c" data-entity-substitution="canonical" data-analytics-linktype="cta">Red Hat によるハイブリッド環境の構築と自動化のサポートについてはこちら</a></rh-cta></p><p> </p><p><style type="text/css"></style>Open Answeres: Red Hat OpenShift とは？(動画の再生時間： 0:31)</p><p><iframe width="560" height="315" src="https://www.youtube.com/embed/xEofcsd6HGg?cc_load_policy=1&cc_lang_pref=ja&si=YO40BpvTmn3rSgKM" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen loading="lazy"></iframe></p></div></div></div> </pfe-jump-links-panel> </div> <div class="lg:dx-col-3 lg:dx-col-3 dx-mt-6 lg:dx-mt-0"> <div class="rhdc--aside-promo" id="aside-promo" data-rh-mbox="aside-promo">  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<div class="rh-generic--component" data-rh-align="left" > Red Hat OpenShift Serverlessは Knativeプロジェクト・ベースのサービスで、ハイブリッドやマルチクラウド環境でサーバーレスのワークロードをデプロイし、管理できます。 </div> </div> </div> </div> <footer class="rh-card-footer" data-rh-layout="">  <div class="rh-group--layout" > <div class="rh-group-body" >  <div class="rh-cta-multi-basic--component" data-rh-align="left" data-rh-display="inline" >   <span class="rh-cta--component" data-rh-cta-type="secondary" > <a class="rh-cta-link" href="/ja/topics/microservices/why-choose-openshift-serverless" title="article | red hat openshift serverless[DO NOT OVERWRITE JA PAGE]" data-analytics-linkType="cta" data-analytics-text="Read the article" data-analytics-category="Keep reading | article | red hat openshift serverless" >記事を読む<span aria-hidden="true"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 36 36"> <path d="M31.58 18.24a.64.64 0 0 0-.14-.68l-9-9c-.56-.58-1.47.32-.88.88l7.93 7.94H5a.62.62 0 1 0 0 1.24h24.49l-7.93 7.94a.62.62 0 0 0 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Kubernetes クラスタとは？をわかりやすく解説