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<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width"/><meta charSet="utf-8"/><title>Kubernetes</title><script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script><script id="MathJax-script" async="" src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script><script type="text/x-mathjax-config">
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</script><meta name="next-head-count" content="6"/><link rel="preload" href="/wiki/_next/static/css/52fc2ba29703df73922c.css" as="style"/><link rel="stylesheet" href="/wiki/_next/static/css/52fc2ba29703df73922c.css" data-n-g=""/><noscript data-n-css=""></noscript><link rel="preload" href="/wiki/_next/static/chunks/main-ae4733327bd95c4ac325.js" as="script"/><link rel="preload" href="/wiki/_next/static/chunks/webpack-50bee04d1dc61f8adf5b.js" as="script"/><link rel="preload" href="/wiki/_next/static/chunks/framework.9d524150d48315f49e80.js" as="script"/><link rel="preload" href="/wiki/_next/static/chunks/commons.0e1c3f9aa780c2dfe9f0.js" as="script"/><link rel="preload" href="/wiki/_next/static/chunks/pages/_app-8e3d0c58a60ec788aa69.js" as="script"/><link rel="preload" href="/wiki/_next/static/chunks/940643274e605e7596ecea1f2ff8d83317a3fb76.4841a16762f602a59f00.js" as="script"/><link rel="preload" href="/wiki/_next/static/chunks/pages/%5B%5B...slug%5D%5D-1aa198f87ede1cd0e1dc.js" as="script"/></head><body><div id="__next"><main><h1>Kubernetes</h1><section class="post-metadata"><span>Date: <!-- -->2021-06-13 14:37:01 +08:00</span><span>Date modified: <!-- -->2021-06-14 22:42:48 +08:00</span></section><nav class="toc"><ol class="toc-level toc-level-1"></ol></nav><p>Kubernetes is a container orchestrator letting you manage hundreds of containers at a time.
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While managing multiple containers with engines such as Docker and Podman, it is not really feasible if you want hundreds of them.
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</p><p>Kubernetes is composed of multiple components and can be intermingled with other related tools.
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For this, pre-bundled solutions (also known as distributions) such as <a href="http://k3s.io/">K3s</a> exists with some related tools embedded to make installation easier.
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</p><p>Most installations feature the <a href="/wiki/cli.kubectl">kubectl</a> that controls the Kubernetes cluster.
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This is the program that you'll most likely going to pay attention to.
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</p><ul><li><p>composed of multiple smaller components:
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</p><ul><li><p>kubelet runs on all nodes, managing nodes — i.e., notifying the API server where the nodes belongs to
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</p></li><li><p>kubeconfig is the term for a Kubernetes cluster configuration;
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mainly written in YAML file
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</p></li></ul></li><li><p>Kubernetes uses the building blocks structure (or resources) that composes of simple blocks that can be combined to create complex operations
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</p></li><li><p>it also has extensibility mainly through exposing the API and letting you create custom resource definitions to fully extend Kubernetes with your app
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</p></li><li><p>Kubernetes manages the cluster along with some resources
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</p><ul><li><p><strong>the nodes which contain multiple pods</strong></p><ul><li><p>nodes are categorized either as a master or a worker node
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</p></li><li><p>a master node is where the control plane is located
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</p></li><li><p>a worker node is where the data plane is located
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</p></li></ul></li><li><p><strong>pods which is a collection of containers</strong>;
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usually, they are managed indirectly with deployments or resource sets;
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while pods can run multiple containers, it often contains one container as a recommended practice
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</p></li><li><p><strong>deployments create the specification of the application state</strong></p></li><li><p><strong>replica sets ensure that pods are running at any given time even while replacing the pods</strong></p></li><li><p><strong>configmaps manages secrets in the cluster</strong>;
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this includes passing configurations between different pods;
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secrets are either set imperatively (in the command line) or declaratively (from a file)
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</p></li><li><p><strong>namespaces separates application from each other</strong>, similarly to namespacing found in programming languages — e.g., Rust with modules, C++ namespaces, etc.
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</p></li></ul></li><li><p>while you can manage resources in the command line, you can create manifests that Kubernetes can simply apply
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</p><ul><li><p>think of it as declarative way of cluster management (i.e., with files) instead of imperative (i.e., invoking in the command line)
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</p></li></ul></li></ul><section><h2>Backlinks</h2><ul><li><a href="/wiki/cli.kubectl">Command line: kubectl</a></li></ul></section></main></div><script id="__NEXT_DATA__" type="application/json">{"props":{"pageProps":{"metadata":{"date":"\"2021-06-13 14:37:01 +08:00\"","date_modified":"\"2021-06-14 22:42:48 +08:00\"","language":"en","source":""},"title":"Kubernetes","hast":{"type":"root","children":[{"type":"element","tagName":"nav","properties":{"className":"toc"},"children":[{"type":"element","tagName":"ol","properties":{"className":"toc-level toc-level-1"},"children":[]}]},{"type":"element","tagName":"p","properties":{},"children":[{"type":"text","value":"Kubernetes is a container orchestrator letting you manage hundreds of containers at a time.\nWhile managing multiple containers with engines such as Docker and Podman, it is not really feasible if you want hundreds of them.\n"}]},{"type":"element","tagName":"p","properties":{},"children":[{"type":"text","value":"Kubernetes is 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