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<!DOCTYPE html><html><head><meta charSet="utf-8"/><title>Docker first image – Nextra</title><meta name="robots" content="index,follow"/><meta property="og:title" content="Docker first image – Nextra"/><meta name="theme-color" content="#111" media="(prefers-color-scheme: dark)"/><meta name="viewport" content="width=device-width, initial-scale=1.0, viewport-fit=cover"/><style>
:root {
--nextra-primary-hue: 212deg;
--nextra-primary-saturation: 100%;
--nextra-navbar-height: 4rem;
--nextra-menu-height: 3.75rem;
--nextra-banner-height: 2.5rem;
}
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--nextra-primary-hue: 204deg;
--nextra-primary-saturation: 100%;
}
</style><meta name="msapplication-TileColor" content="#fff"/><meta http-equiv="Content-Language" content="en"/><meta name="description" content="Nextra: the next docs builder"/><meta name="twitter:card" content="summary_large_image"/><meta name="twitter:site" content="@shuding_"/><meta property="og:title" content="Nextra: the next docs builder"/><meta property="og:description" content="Nextra: the next docs builder"/><meta name="apple-mobile-web-app-title" content="Nextra"/><meta name="next-head-count" content="15"/><link rel="preload" href="/_next/static/css/445c4173ffc2bf04.css" as="style" crossorigin=""/><link rel="stylesheet" href="/_next/static/css/445c4173ffc2bf04.css" crossorigin="" data-n-p=""/><noscript data-n-css=""></noscript><script defer="" crossorigin="" nomodule="" src="/_next/static/chunks/polyfills-c67a75d1b6f99dc8.js"></script><script src="/_next/static/chunks/webpack-6af0e3c12b874bb0.js" defer="" crossorigin=""></script><script 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href="/deployment/update">Update</a></li></ul></div></div></li><li class="nx-flex nx-flex-col nx-gap-1"><a class="nx-flex nx-rounded nx-px-2 nx-py-1.5 nx-text-sm nx-transition-colors [word-break:break-word] nx-cursor-pointer [-webkit-tap-highlight-color:transparent] [-webkit-touch-callout:none] contrast-more:nx-border nx-text-gray-500 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:nx-text-neutral-400 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50 contrast-more:nx-text-gray-900 contrast-more:dark:nx-text-gray-50 contrast-more:nx-border-transparent contrast-more:hover:nx-border-gray-900 contrast-more:dark:hover:nx-border-gray-50" href="/service">Service</a></li></ul></div></div></div><div class="nx-sticky nx-bottom-0 nx-bg-white dark:nx-bg-dark nx-mx-4 nx-py-4 nx-shadow-[0_-12px_16px_#fff] nx-flex nx-items-center nx-gap-2 dark:nx-border-neutral-800 dark:nx-shadow-[0_-12px_16px_#111] contrast-more:nx-border-neutral-400 contrast-more:nx-shadow-none 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contrast-more:nx-underline contrast-more:dark:nx-text-gray-50 nx-w-full nx-break-words">Extra Comments:</a></li><li class="nx-my-2 nx-scroll-my-6 nx-scroll-py-6"><a href="#building-the-image" class="nx-font-semibold nx-inline-block nx-text-gray-500 hover:nx-text-gray-900 dark:nx-text-gray-400 dark:hover:nx-text-gray-300 contrast-more:nx-text-gray-900 contrast-more:nx-underline contrast-more:dark:nx-text-gray-50 nx-w-full nx-break-words">Building the Image</a></li></ul><div class="nx-mt-8 nx-border-t nx-bg-white nx-pt-8 nx-shadow-[0_-12px_16px_white] dark:nx-bg-dark dark:nx-shadow-[0_-12px_16px_#111] nx-sticky nx-bottom-0 nx-flex nx-flex-col nx-items-start nx-gap-2 nx-pb-8 dark:nx-border-neutral-800 contrast-more:nx-border-t contrast-more:nx-border-neutral-400 contrast-more:nx-shadow-none contrast-more:dark:nx-border-neutral-400"><a href="https://github.com/lukaskaska/k8s-first-guide/issues/new?title=Feedback%20for%20%E2%80%9CDocker%20first%20image%E2%80%9D&labels=feedback" target="_blank" rel="noreferrer" class="nx-text-xs nx-font-medium nx-text-gray-500 hover:nx-text-gray-900 dark:nx-text-gray-400 dark:hover:nx-text-gray-100 contrast-more:nx-text-gray-800 contrast-more:dark:nx-text-gray-50">Question? Give us feedback →<span class="nx-sr-only nx-select-none"> (opens in a new tab)</span></a><a class="nx-text-xs nx-font-medium nx-text-gray-500 hover:nx-text-gray-900 dark:nx-text-gray-400 dark:hover:nx-text-gray-100 contrast-more:nx-text-gray-800 contrast-more:dark:nx-text-gray-50" href="https://github.com/lukaskaska/k8s-first-guide/pages/docker.mdx">Edit this page</a></div></div></nav><div id="reach-skip-nav"></div><article class="nx-w-full nx-break-words nextra-content nx-flex nx-min-h-[calc(100vh-var(--nextra-navbar-height))] nx-min-w-0 nx-justify-center nx-pb-8 nx-pr-[calc(env(safe-area-inset-right)-1.5rem)]"><main class="nx-w-full nx-min-w-0 nx-max-w-6xl nx-px-6 nx-pt-4 md:nx-px-12"><div class="nextra-breadcrumb nx-mt-1.5 nx-flex nx-items-center nx-gap-1 nx-overflow-hidden nx-text-sm nx-text-gray-500 dark:nx-text-gray-400 contrast-more:nx-text-current"><div class="nx-whitespace-nowrap nx-transition-colors nx-font-medium nx-text-gray-700 contrast-more:nx-font-bold contrast-more:nx-text-current dark:nx-text-gray-100 contrast-more:dark:nx-text-current" title="Docker">Docker</div></div><h1 class="nx-mt-2 nx-text-4xl nx-font-bold nx-tracking-tight nx-text-slate-900 dark:nx-text-slate-100">Docker first image</h1>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The first step to using Kubernetes is to understand how containerized applications work and how to create them, because kubernetes is an open-source system for automating deployment, scaling, and management of <b>containerized applications</b>.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">In this step, we will quickly create a test application and build a Docker image of it. Later, we will run this application to see firsthand what we are doing.</p>
<h2 class="nx-font-semibold nx-tracking-tight nx-text-slate-900 dark:nx-text-slate-100 nx-mt-10 nx-border-b nx-pb-1 nx-text-3xl nx-border-neutral-200/70 contrast-more:nx-border-neutral-400 dark:nx-border-primary-100/10 contrast-more:dark:nx-border-neutral-400">First Dockerfile<a href="#first-dockerfile" id="first-dockerfile" class="subheading-anchor" aria-label="Permalink for this section"></a></h2>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Today, most backend applications include a Dockerfile in their repository. This practice simplifies local testing across different machines (with multiple developers) and establishes an automated environment. It mitigates the need for complex application setups and eliminates dependencies on specific operating systems.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Each application will have unique requirements in its Dockerfile. Here are some examples:</p>
<ol class="nx-mt-6 nx-list-decimal first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2">Base Image: Defining the base image for the Docker container, such as FROM python:3.9 for a Python application or FROM node:14 for a Node.js application.</li>
<li class="nx-my-2">OS packages: Some applications require specific OS packages to run properly. So, in the Dockerfile, we install these packages to create the necessary environment.</li>
<li class="nx-my-2">Container Startup Command: Specifying the command to run when the container starts, typically using the CMD instruction to execute the application or a script.</li>
</ol>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Now, to keep it simple, let's create a Dockerfile for our test application that doesn't require any complex setup.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">In the repository of this application, we have a folder called 'examples.' Navigate to the 'examples/docker' directory, where you will find the following files:</p>
<ol class="nx-mt-6 nx-list-decimal first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2">index.js</li>
<li class="nx-my-2">package.json</li>
<li class="nx-my-2">Dockerfile</li>
</ol>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The index.js file contains only a getting started of a fastify server, the package.json contains only the fastify dependency and the Dockerfile contains only the basic to install the dependencies and start the app.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Now let's focus exclusively on the Dockerfile.</p>
<div class="nextra-code-block nx-relative nx-mt-6 first:nx-mt-0"><pre class="nx-bg-primary-700/5 nx-mb-4 nx-overflow-x-auto nx-rounded-xl nx-subpixel-antialiased dark:nx-bg-primary-300/10 nx-text-[.9em] contrast-more:nx-border contrast-more:nx-border-primary-900/20 contrast-more:nx-contrast-150 contrast-more:dark:nx-border-primary-100/40 nx-py-4" data-language="yaml" data-theme="default"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr" data-language="yaml" data-theme="default"><span class="line"><span style="color:var(--shiki-token-string-expression)">FROM node:20</span></span>
<span class="line"> </span>
<span class="line"><span style="color:var(--shiki-token-string-expression)">WORKDIR /app</span></span>
<span class="line"> </span>
<span class="line"><span style="color:var(--shiki-token-string-expression)">COPY package.json package.json</span></span>
<span class="line"><span style="color:var(--shiki-token-string-expression)">COPY package-lock.json package-lock.json</span></span>
<span class="line"> </span>
<span class="line"><span style="color:var(--shiki-token-string-expression)">RUN npm ci</span></span>
<span class="line"> </span>
<span class="line"><span style="color:var(--shiki-token-string-expression)">COPY ./index.js .</span></span>
<span class="line"> </span>
<span class="line"><span style="color:var(--shiki-token-string-expression)">CMD [ "node", "index.js" ]</span></span></code></pre><div class="nx-opacity-0 nx-transition [div:hover>&]:nx-opacity-100 focus-within:nx-opacity-100 nx-flex nx-gap-1 nx-absolute nx-m-[11px] nx-right-0 nx-top-0"><button class="nextra-button nx-transition-all active:nx-opacity-50 nx-bg-primary-700/5 nx-border nx-border-black/5 nx-text-gray-600 hover:nx-text-gray-900 nx-rounded-md nx-p-1.5 dark:nx-bg-primary-300/10 dark:nx-border-white/10 dark:nx-text-gray-400 dark:hover:nx-text-gray-50 md:nx-hidden" title="Toggle word wrap"><svg viewBox="0 0 24 24" width="24" height="24" class="nx-pointer-events-none nx-h-4 nx-w-4"><path fill="currentColor" d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3l3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"></path></svg></button></div></div>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The <b>first line</b> is responsible for defining what type of image will be built on, almost as if we choose which OS our app will run on.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">In this example, we're utilizing a base image of Node.js version 20. This image is built on Debian's Bullseye version. If you're curious about the definition of a Docker base image, you can always refer to the Docker website or the <a href="https://github.com/nodejs/docker-node/blob/e8dc03502488e162b6860a6adc3ee8e8ae517e87/20/bookworm/Dockerfile" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">official Node.js Dockerfile<span class="nx-sr-only nx-select-none"> (opens in a new tab)</span></a>.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The <b>second line</b> sets the working directory to '/app' to prevent errors or misplacements, ensuring that all subsequent commands execute within this directory.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The <b>third and fourth lines</b> copy the application's dependency files into the container. Subsequently, the <b>fifth line</b> runs 'npm ci', which installs only the necessary dependencies without dev dependencies. While we could also copy 'node_modules', 'npm ci' is preferred for minimizing the image size by excluding unnecessary dependencies.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">The <b>sixth line</b> copies our application into the image, while the last line executes the command to start our app.</p>
<h3 class="nx-font-semibold nx-tracking-tight nx-text-slate-900 dark:nx-text-slate-100 nx-mt-8 nx-text-2xl">Extra Comments:<a href="#extra-comments" id="extra-comments" class="subheading-anchor" aria-label="Permalink for this section"></a></h3>
<ul class="nx-mt-6 nx-list-disc first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0"><strong>Multiple Steps for Production Environments</strong>: In production environments, consider using multiple steps in the Dockerfile. This approach results in smaller and less vulnerable images. More information can be found <a href="https://docs.docker.com/build/building/multi-stage/" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">here<span class="nx-sr-only nx-select-none"> (opens in a new tab)</span></a>.</p>
</li>
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0"><strong>Handling Private npm Registries</strong>: Companies often use private npm registries to store npm packages. Additional steps may be required to handle npm authentication. For npm registries from npm itself, refer to <a href="https://docs.npmjs.com/docker-and-private-modules" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">this guide<span class="nx-sr-only nx-select-none"> (opens in a new tab)</span></a>. For private registries from other sources (e.g., Azure), utilize the .npmrc file and the NPM_TOKEN environment variable for critical information. Learn how to create the .npmrc file <a href="https://learn.microsoft.com/en-us/azure/devops/artifacts/npm/npmrc?view=azure-devops&tabs=windows%2Cclassic" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">here<span class="nx-sr-only nx-select-none"> (opens in a new tab)</span></a> and how to use it inside the Dockerfile <a href="https://www.mimiz.fr/npm-azure-devops-doker-authentication" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">here<span class="nx-sr-only nx-select-none"> (opens in a new tab)</span></a>.</p>
</li>
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0"><strong>Custom Entrypoint</strong>: The entrypoint can be simple or anything that your need/want. For instance, if your app requires running a script before startup, this is the place to define it.</p>
</li>
</ul>
<h2 class="nx-font-semibold nx-tracking-tight nx-text-slate-900 dark:nx-text-slate-100 nx-mt-10 nx-border-b nx-pb-1 nx-text-3xl nx-border-neutral-200/70 contrast-more:nx-border-neutral-400 dark:nx-border-primary-100/10 contrast-more:dark:nx-border-neutral-400">Building the Image<a href="#building-the-image" id="building-the-image" class="subheading-anchor" aria-label="Permalink for this section"></a></h2>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">With everything in place, let's build our image and run it locally for testing. First, ensure that Docker is installed and running on your system.</p>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">To build the image, follow these steps:</p>
<ol class="nx-mt-6 nx-list-decimal first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Open your terminal and navigate to the 'examples/docker' folder.</p>
<ul class="nx-mt-6 nx-list-disc first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2">Run <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">ls</code> to confirm that you are inside the 'examples/docker' folder.</li>
</ul>
</li>
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Run the command:</p>
<div class="nextra-code-block nx-relative nx-mt-6 first:nx-mt-0"><pre class="nx-bg-primary-700/5 nx-mb-4 nx-overflow-x-auto nx-rounded-xl nx-subpixel-antialiased dark:nx-bg-primary-300/10 nx-text-[.9em] contrast-more:nx-border contrast-more:nx-border-primary-900/20 contrast-more:nx-contrast-150 contrast-more:dark:nx-border-primary-100/40 nx-py-4" data-language="text" data-theme="default"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr" data-language="text" data-theme="default"><span class="line"><span style="color:var(--shiki-color-text)">docker build -t somename/backend-00 .</span></span></code></pre><div class="nx-opacity-0 nx-transition [div:hover>&]:nx-opacity-100 focus-within:nx-opacity-100 nx-flex nx-gap-1 nx-absolute nx-m-[11px] nx-right-0 nx-top-0"><button class="nextra-button nx-transition-all active:nx-opacity-50 nx-bg-primary-700/5 nx-border nx-border-black/5 nx-text-gray-600 hover:nx-text-gray-900 nx-rounded-md nx-p-1.5 dark:nx-bg-primary-300/10 dark:nx-border-white/10 dark:nx-text-gray-400 dark:hover:nx-text-gray-50 md:nx-hidden" title="Toggle word wrap"><svg viewBox="0 0 24 24" width="24" height="24" class="nx-pointer-events-none nx-h-4 nx-w-4"><path fill="currentColor" d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3l3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"></path></svg></button></div></div>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">This command builds the image. The name 'somename/backend-00' is arbitrary for now but will become important in the future. Don't forget to include the dot at the end of the command.</p>
</li>
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">After successful build, you should see a message like "naming to docker.io/somename/backend-00". This indicates that the image is now available in your local Docker registry. You can verify this by running:</p>
<div class="nextra-code-block nx-relative nx-mt-6 first:nx-mt-0"><pre class="nx-bg-primary-700/5 nx-mb-4 nx-overflow-x-auto nx-rounded-xl nx-subpixel-antialiased dark:nx-bg-primary-300/10 nx-text-[.9em] contrast-more:nx-border contrast-more:nx-border-primary-900/20 contrast-more:nx-contrast-150 contrast-more:dark:nx-border-primary-100/40 nx-py-4" data-language="text" data-theme="default"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr" data-language="text" data-theme="default"><span class="line"><span style="color:var(--shiki-color-text)">docker images</span></span></code></pre><div class="nx-opacity-0 nx-transition [div:hover>&]:nx-opacity-100 focus-within:nx-opacity-100 nx-flex nx-gap-1 nx-absolute nx-m-[11px] nx-right-0 nx-top-0"><button class="nextra-button nx-transition-all active:nx-opacity-50 nx-bg-primary-700/5 nx-border nx-border-black/5 nx-text-gray-600 hover:nx-text-gray-900 nx-rounded-md nx-p-1.5 dark:nx-bg-primary-300/10 dark:nx-border-white/10 dark:nx-text-gray-400 dark:hover:nx-text-gray-50 md:nx-hidden" title="Toggle word wrap"><svg viewBox="0 0 24 24" width="24" height="24" class="nx-pointer-events-none nx-h-4 nx-w-4"><path fill="currentColor" d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3l3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"></path></svg></button></div></div>
</li>
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Now, run the app using the command:</p>
<div class="nextra-code-block nx-relative nx-mt-6 first:nx-mt-0"><pre class="nx-bg-primary-700/5 nx-mb-4 nx-overflow-x-auto nx-rounded-xl nx-subpixel-antialiased dark:nx-bg-primary-300/10 nx-text-[.9em] contrast-more:nx-border contrast-more:nx-border-primary-900/20 contrast-more:nx-contrast-150 contrast-more:dark:nx-border-primary-100/40 nx-py-4" data-language="text" data-theme="default"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr" data-language="text" data-theme="default"><span class="line"><span style="color:var(--shiki-color-text)">docker run -d -p 3000:3000 somename/backend-00</span></span></code></pre><div class="nx-opacity-0 nx-transition [div:hover>&]:nx-opacity-100 focus-within:nx-opacity-100 nx-flex nx-gap-1 nx-absolute nx-m-[11px] nx-right-0 nx-top-0"><button class="nextra-button nx-transition-all active:nx-opacity-50 nx-bg-primary-700/5 nx-border nx-border-black/5 nx-text-gray-600 hover:nx-text-gray-900 nx-rounded-md nx-p-1.5 dark:nx-bg-primary-300/10 dark:nx-border-white/10 dark:nx-text-gray-400 dark:hover:nx-text-gray-50 md:nx-hidden" title="Toggle word wrap"><svg viewBox="0 0 24 24" width="24" height="24" class="nx-pointer-events-none nx-h-4 nx-w-4"><path fill="currentColor" d="M4 19h6v-2H4v2zM20 5H4v2h16V5zm-3 6H4v2h13.25c1.1 0 2 .9 2 2s-.9 2-2 2H15v-2l-3 3l3 3v-2h2c2.21 0 4-1.79 4-4s-1.79-4-4-4z"></path></svg></button></div></div>
<ul class="nx-mt-6 nx-list-disc first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2">The <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">-d</code> flag runs the container in detach mode, docker will start your container and return you to the terminal prompt.</li>
<li class="nx-my-2">The <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">-p 3000:3000</code> flag binds port 3000 of the container to TCP port 3000 on 127.0.0.1 of the host. More information <a href="https://docs.docker.com/reference/cli/docker/container/run/#publish" target="_blank" rel="noreferrer" class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]">here<span class="nx-sr-only nx-select-none"> (opens in a new tab)</span></a>.</li>
<li class="nx-my-2">Replace <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">somename/backend-00</code> with the image name. You can specify a version like <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">somename/backend-00:v1</code>.</li>
</ul>
</li>
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">To view the logs of the container, use:</p>
<ul class="nx-mt-6 nx-list-disc first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">docker ps</code> to list all running containers and get the container id.</li>
<li class="nx-my-2"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">docker logs <container_id></code> to view logs.</li>
<li class="nx-my-2"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">docker logs -f <container_id></code> to follow the logs continuously.</li>
</ul>
</li>
<li class="nx-my-2">
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">To stop the container:</p>
<ul class="nx-mt-6 nx-list-disc first:nx-mt-0 ltr:nx-ml-6 rtl:nx-mr-6">
<li class="nx-my-2"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">docker ps</code> to list all running containers.</li>
<li class="nx-my-2"><code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">docker stop <container_id></code> or <code class="nx-border-black nx-border-opacity-[0.04] nx-bg-opacity-[0.03] nx-bg-black nx-break-words nx-rounded-md nx-border nx-py-0.5 nx-px-[.25em] nx-text-[.9em] dark:nx-border-white/10 dark:nx-bg-white/10" dir="ltr">docker kill <container_id></code>. The former stops the container gracefully, while the latter kills the process immediately.</li>
</ul>
</li>
</ol>
<p class="nx-mt-6 nx-leading-7 first:nx-mt-0">Now you're ready to move on to the <a class="nx-text-primary-600 nx-underline nx-decoration-from-font [text-underline-position:from-font]" href="/kind">next step!</a> 😊</p><div class="nx-mt-16"></div><div class="nx-mb-8 nx-flex nx-items-center nx-border-t nx-pt-8 dark:nx-border-neutral-800 contrast-more:nx-border-neutral-400 dark:contrast-more:nx-border-neutral-400 print:nx-hidden"><a title="Kubernetes getting started" class="nx-flex nx-max-w-[50%] nx-items-center nx-gap-1 nx-py-4 nx-text-base nx-font-medium nx-text-gray-600 nx-transition-colors [word-break:break-word] hover:nx-text-primary-600 dark:nx-text-gray-300 md:nx-text-lg ltr:nx-pr-4 rtl:nx-pl-4" href="/"><svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="nx-inline nx-h-5 nx-shrink-0 ltr:nx-rotate-180"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path></svg>Kubernetes getting started</a><a title="kind" class="nx-flex nx-max-w-[50%] nx-items-center nx-gap-1 nx-py-4 nx-text-base nx-font-medium nx-text-gray-600 nx-transition-colors [word-break:break-word] hover:nx-text-primary-600 dark:nx-text-gray-300 md:nx-text-lg ltr:nx-ml-auto ltr:nx-pl-4 ltr:nx-text-right rtl:nx-mr-auto rtl:nx-pr-4 rtl:nx-text-left" href="/kind">kind<svg fill="none" viewBox="0 0 24 24" stroke="currentColor" class="nx-inline nx-h-5 nx-shrink-0 rtl:nx-rotate-180"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5l7 7-7 7"></path></svg></a></div></main></article></div><footer class="nx-bg-gray-100 nx-pb-[env(safe-area-inset-bottom)] dark:nx-bg-neutral-900 print:nx-bg-transparent"><div class="nx-mx-auto nx-flex nx-max-w-[90rem] nx-gap-2 nx-py-2 nx-px-4 nx-hidden"><button title="Change theme" class="nx-h-7 nx-rounded-md nx-px-2 nx-text-left nx-text-xs nx-font-medium nx-text-gray-600 nx-transition-colors dark:nx-text-gray-400 hover:nx-bg-gray-100 hover:nx-text-gray-900 dark:hover:nx-bg-primary-100/5 dark:hover:nx-text-gray-50" id="headlessui-listbox-button-:Rkt6:" type="button" aria-haspopup="listbox" aria-expanded="false" data-headlessui-state=""><div class="nx-flex nx-items-center nx-gap-2 nx-capitalize"><svg fill="none" viewBox="3 3 18 18" width="12" height="12" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" fill="currentColor" d="M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z"></path></svg><span class="">Light</span></div></button></div><hr class="dark:nx-border-neutral-800"/><div class="nx-mx-auto nx-flex nx-max-w-[90rem] nx-justify-center nx-py-12 nx-text-gray-600 dark:nx-text-gray-400 md:nx-justify-start nx-pl-[max(env(safe-area-inset-left),1.5rem)] nx-pr-[max(env(safe-area-inset-right),1.5rem)]">Kubernetes first guide</div></footer></div></div><script id="__NEXT_DATA__" type="application/json" crossorigin="">{"props":{"pageProps":{}},"page":"/docker","query":{},"buildId":"Ng4ki_0X0O5SW6y9dAjYH","nextExport":true,"autoExport":true,"isFallback":false,"scriptLoader":[]}</script></body></html>