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Merge pull request #672 from vr-varad/update/sks-containers-part
Update SKS Starter: Containers
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‎content/en/learning-paths/intro-kubernetes-course/containers/content/build-and-run.md

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---
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docType: "Chapter"
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id: "Build & Run"
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chapterTitle: "Build & Run"
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description: ""
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lectures: 10
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title: "Build & Run"
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weight: 10
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">Build & Run</h2>
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```bash
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docker build
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```
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In our example, the first step is to build the hello-world container with the > docker build command.
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{{< image src="/images/learning-path/intro-kubernetes/containers/c1_l10_1.png" width="100%" align="center" alt="Docker Build" >}}
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```bash
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docker run
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```
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In our example, the second step is to run the hello-world container with the > docker run command.
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{{< image src="/images/learning-path/intro-kubernetes/containers/c1_l10_2.png" width="100%" align="center" alt="Docker Run" >}}
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<h3 class="chapter-sub-heading">Build & Run</h3>
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<p>Video: Build & Run </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid7.mp4?1752342546480" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/containers.md

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---
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docType: "Chapter"
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id: "Containers"
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chapterTitle: "Containers"
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description: ""
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lectures: 8
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title: "Containers"
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weight: 8
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">Containers</h2>
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{{< image src="/images/learning-path/intro-kubernetes/containers/c1_l8_1.png" width="100%" align="center" alt="Containers" >}}
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<h3 class="chapter-sub-heading">Containers</h3>
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<p>Video: Containers </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid4.mp4?1752342051186" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/dependencies.md

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---
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docType: "Chapter"
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id: "Dependencies"
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chapterTitle: "Dependencies"
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description: ""
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lectures: 7
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title: "Dependencies"
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weight: 7
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">Dealing with Dependencies</h2>
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<h3 class="chapter-sub-heading">Installing Dependencies ...</h3>
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... on Ubuntu
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```bash
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# Install repository
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$ curl -fsSL https://deb.nodesource.com/setup_current.x | sudo -E bash –sudo apt-get update
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# Install NodeJS
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$ sudo apt-get install -y nodejs
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# Install Dependencies of the app
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$ npm install
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```
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<h3 class="chapter-sub-heading">Running ...</h3>
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... the application
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```bash
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# Download or Upload app.js to the server somehow…
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# Run
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$ node app.js
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```
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<h3 class="chapter-sub-heading">Dependencies</h3>
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<p>Video: Dependencies </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid3.mp4?1752341753956" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/docker-hub.md

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---
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docType: "Chapter"
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id: "Docker Hub"
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chapterTitle: "Docker Hub"
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description: ""
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lectures: 11
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title: "Docker Hub"
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weight: 11
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">Docker Hub</h2>
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Using a publicly available repository to manage, store, retrieve, and share (if you want to) your container images is a real added value. In traditional IT scenarios, such a solution has to be custom-built most of the time. In the container world, such solutions are part of the ecosystem. With docker containers, the Docker Hub is a natural solution as a repository for our scenarios.
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{{< image src="/images/learning-path/intro-kubernetes/containers/c1_l11_1.png" width="100%" align="center" alt="Docker Hub" >}}
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```bash
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docker run
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```
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In our example, the second step is to run the hello-world container with the > docker run command.
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{{< image src="/images/learning-path/intro-kubernetes/containers/c1_l10_2.png" width="100%" align="center" alt="Docker Run" >}}
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<h3 class="chapter-sub-heading">Docker Hub</h3>
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<p>Video: Docker Hub </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid8.mp4?1752343043012" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/docker-kubernetes.md

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---
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docType: "Chapter"
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id: "Docker / Kubernetes"
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chapterTitle: "Docker / Kubernetes"
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description: ""
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lectures: 12
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title: "Docker / Kubernetes"
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weight: 12
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">From Docker To Kubernetes</h2>
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If you want to scale all the container benefits to an entire IT environment, you need additional functions to coordinate, scale, manage, and automate. For example, taking containerized applications from your local machine to your local server can be done without additional help. Still, if you want to do this with 10, 100, or even 1000 applications and start distributing the workloads, clustering them for higher availability and stability in operations to serve the 24/7 demands of today's customers, you need additional help. This help for containerized applications is Kubernetes. This help for a scalable, available, and more flexible infrastructure is Exoscale.
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<h3 class="chapter-sub-heading">Docker Hub</h3>
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<p>Video: Docker Hub </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid9.mp4?1752343147000" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/dockerfile.md

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---
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docType: "Chapter"
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id: "Dockerfile"
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chapterTitle: "Dockerfile"
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description: ""
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lectures: 9
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title: "Dockerfile"
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weight: 9
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">Dockerfile</h2>
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```yaml
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FROM node:12-alpine * to be based on which other Docker image?
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RUN apk add --no-cache python g++ make * install additional software
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WORKDIR /app * create and use directory /app inside the container
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COPY . . * 1st parameter: local directory (./ is the directory where the Dockerfile is) * 2nd parameter: target directory inside the container * → copy everything where the Dockerfile is in, into the container under /app
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RUN npm install * dependencies for the application
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CMD ["node", "src/index.js"] * run the app - just like when running outside a container
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```
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<h3 class="chapter-sub-heading">Dockerfile Theory</h3>
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<p>Video: Dockerfile Theory </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid5.mp4?1752342254038" type="video/mp4">
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</video>
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</div>
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</br>
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</br>
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<h3 class="chapter-sub-heading">Dockerfile Practice</h3>
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<p>Video: Dockerfile Practice </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid6.mp4?1752342254053" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/history_of_application_deployment.md

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Containers are similar to VMs, but they have relaxed isolation properties to share the Operating System (OS) among the applications. Therefore, containers are considered lightweight. Similar to a VM, a container has its own file system, share of CPU, memory, process space, and more. As they are decoupled from the underlying infrastructure, they are portable across clouds and OS distributions.
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<h3 class="chapter-sub-heading">App Deployment</h3>
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<p>Video: Application Deployment Overview</p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid0.mp4?1752340619870" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/running-application.md

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---
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docType: "Chapter"
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id: "Running Application"
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chapterTitle: "Running Applications"
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description: ""
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lectures: 6
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title: "Running Applications"
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weight: 6
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">What do I need ...</h2>
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Considering the next steps based on the Node.js sample app from before.
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<h3 class="chapter-sub-heading"><strong>What do I need to run apps in container?</strong></h3>
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<ul>
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<li>Node.js – in the correct Version</li>
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<li>All dependencies of the App (e.g. via Package Manager NPM)</li>
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</ul>
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<h3 class="chapter-sub-heading"><strong>Possibly … when the Application gets bigger ...</strong></h3>
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<ul>
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<li>Database (and its requirements …)</li>
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<li>Private Network</li>
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</ul>
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<h3 class="chapter-sub-heading">Running Apps</h3>
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<p>Video: Running App </p>
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<div style="border: 2px solid #ccc; border-radius: 8px; padding: 10px; background-color: #1e1e1e; box-shadow: 0 4px 12px rgba(0,0,0,0.3); margin-top: 1em; margin-bottom: 1em; width: 75%; height:50%; display: block; margin: auto;">
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<video width="100%" height="100%" autoplay controls>
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<source src="https://sos-de-fra-1.exo.io/exoscale-academy/videos/sks_starter_vid2.mp4?1752341367873" type="video/mp4">
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</video>
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</div>
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{{< /chapterstyle >}}

‎content/en/learning-paths/intro-kubernetes-course/containers/content/sample-application.md

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---
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docType: "Chapter"
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id: "Sample Application"
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chapterTitle: "Sample Application"
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description: ""
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lectures: 5
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title: "Sample Application"
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weight: 5
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---
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{{< chapterstyle >}}
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<h2 class="chapter-sub-heading">Sample Application using Node.js</h2>
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This sample app demonstration shows how traditional software deployment looks. A little JavaScript spins up a web server and runs the sample app on the server. It demonstrates how easy it is to run web-based applications, but still, you need to install and run Node.js beforehand. In addition, you have to use the proper versions of the software components in place and take care of all dependencies (runtime environments, libraries, ...). Otherwise, the app will not run or will not run properly.
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This is the source code of our sample app:
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```javascript
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const express = require("express")
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const app = express()
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const port = 3000
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app.get('/', (req, res) => { res.send("Hello World!") })
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app.listen(port, () => {
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console.log("Example app listening at http://localhost:3000")
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})
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```
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Take the code into action:
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```bash
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node app.js
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```
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The application at work, displaying Hello World!:
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{{< image src="/images/learning-path/intro-kubernetes/containers/c1_l5_1.png" width="100%" align="center" alt="NodeJS App" >}}
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{{< /chapterstyle >}}

‎static/images/learning-path/intro-kubernetes/containers/c1_l10_1.png

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