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# Learn Kubernetes <img src="https://www.shareicon.net/data/128x128/2017/04/11/883708_media_512x512.png" alt="YouTube" width="5%" height="5%"> :hammer::wrench:
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This guide is aimed to fast-track your Kubernetes learning by focusing on a practical hands-on overview guide. </br>
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This means, not too much of a deepdive, but enough to get a feel for the required building blocks of Kubernetes so you can align it with a real world problem that you are trying to solve. </br>
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<b>The problem:</b> "I want to adopt Kubernetes" </br>
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<b>The problem:</b> "I have some common existing infrastructure"
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<b>Our focus:</b> Solving the problem by learning each building block
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in order to port our infrastructure to Kubernetes.
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## Docker installation
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* Install Docker [here](https://docs.docker.com/get-docker/)
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## Run Kubernetes
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* Install `kubectl` to work with kubernetes
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We'll head over to the [kubernetes](https://kubernetes.io/docs/tasks/tools/) site to download `kubectl`
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* Install the `kind` binary
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You will want to head over to the [kind](https://kind.sigs.k8s.io/) site
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* Create a cluster
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```
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kind create cluster
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```
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## Namespaces
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```
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kubectl create namespace cms
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```
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## Deployments
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* Deployment [documentation](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/)
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cd kubernetes\tutorial
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```
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kubectl -n cms apply -f deploy.yaml
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kubectl -n cms get pods
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kubectl -n cms port-forward <pod-name> 80
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```
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[Environment Variables](https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/) for pods
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## Secrets
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```
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kubectl -n cms create secret generic wordpress `
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--from-literal WORDPRESS_DB_HOST=mysql `
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--from-literal WORDPRESS_DB_USER=exampleuser `
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--from-literal WORDPRESS_DB_PASSWORD=examplepassword `
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--from-literal WORDPRESS_DB_NAME=exampledb
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kubectl -n cms get secret
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```
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[How to use](https://kubernetes.io/docs/concepts/configuration/secret/) secrets in pods
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Apply changes to our deployment
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```
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kubectl -n cms apply -f deploy.yaml
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```
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We can `port-forward` again, and notice an error connecting to the database because the database does not exist
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# Statefulset
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Statefulset [documentation](https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/)
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# Storage Class
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StorageClass [documentation](https://kubernetes.io/docs/concepts/storage/storage-classes/)
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# Services
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Services [documentation](https://kubernetes.io/docs/concepts/services-networking/service/)
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Let's deploy our `mysql` using what we learnt above:
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```
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kubectl -n cms apply -f .\statefulset.yaml
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```
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## Full playlist
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<a href="https://www.youtube.com/playlist?list=PLHq1uqvAteVvUEdqaBeMK2awVThNujwMd" title="Kubernetes"><img src="https://i.ytimg.com/vi/8h4FoWK7tIA/hqdefault.jpg" width="50%" height="50%" alt="Kubernetes Guide" /></a>
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92
kubernetes/tutorials/basics/README.md
Normal file
92
kubernetes/tutorials/basics/README.md
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@ -0,0 +1,92 @@
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# Tutorial: The Basics
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This guide is aimed to fast-track your Kubernetes learning by focusing on a practical hands-on overview guide. </br>
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<hr/>
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<b>The problem:</b> "I want to adopt Kubernetes" </br>
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<b>The problem:</b> "I have some common existing infrastructure"
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<hr/>
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<b>Our focus:</b> Solving the problem by learning each building block
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in order to port our infrastructure to Kubernetes.
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## Docker installation
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* Install Docker [here](https://docs.docker.com/get-docker/)
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## Run Kubernetes
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* Install `kubectl` to work with kubernetes
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We'll head over to the [kubernetes](https://kubernetes.io/docs/tasks/tools/) site to download `kubectl`
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* Install the `kind` binary
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You will want to head over to the [kind](https://kind.sigs.k8s.io/) site
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* Create a cluster
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```
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kind create cluster
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```
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## Namespaces
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```
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kubectl create namespace cms
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```
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## Deployments
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* Deployment [documentation](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/)
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cd kubernetes\tutorial
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```
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kubectl -n cms apply -f deploy.yaml
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kubectl -n cms get pods
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kubectl -n cms port-forward <pod-name> 80
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```
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[Environment Variables](https://kubernetes.io/docs/tasks/inject-data-application/define-environment-variable-container/) for pods
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## Secrets
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```
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kubectl -n cms create secret generic wordpress `
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--from-literal WORDPRESS_DB_HOST=mysql `
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--from-literal WORDPRESS_DB_USER=exampleuser `
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--from-literal WORDPRESS_DB_PASSWORD=examplepassword `
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--from-literal WORDPRESS_DB_NAME=exampledb
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kubectl -n cms get secret
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```
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[How to use](https://kubernetes.io/docs/concepts/configuration/secret/) secrets in pods
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Apply changes to our deployment
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```
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kubectl -n cms apply -f deploy.yaml
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```
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We can `port-forward` again, and notice an error connecting to the database because the database does not exist
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# Statefulset
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Statefulset [documentation](https://kubernetes.io/docs/concepts/workloads/controllers/statefulset/)
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# Storage Class
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StorageClass [documentation](https://kubernetes.io/docs/concepts/storage/storage-classes/)
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# Services
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Services [documentation](https://kubernetes.io/docs/concepts/services-networking/service/)
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Let's deploy our `mysql` using what we learnt above:
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```
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kubectl -n cms apply -f .\statefulset.yaml
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```
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