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@ -8,7 +8,7 @@ The Ultimate Swiss Army knife for DevOps, Developers and Platform Engineers
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| Steps | Playlist :tv: | Source :octocat: |
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|---|---|---|
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| Learn Kubernetes :snowflake: | <a href="https://www.youtube.com/playlist?list=PLHq1uqvAteVvUEdqaBeMK2awVThNujwMd" title="Kubernetes"><img src="https://i.ytimg.com/vi/8h4FoWK7tIA/hqdefault.jpg" width="50%" alt="Kubernetes Guide" /></a> | [source](./kubernetes/readme.md) |
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| [Learn Kubernetes](./kubernetes/README.md) :snowflake: | <a href="https://www.youtube.com/playlist?list=PLHq1uqvAteVvUEdqaBeMK2awVThNujwMd" title="Kubernetes"><img src="https://i.ytimg.com/vi/8h4FoWK7tIA/hqdefault.jpg" width="50%" alt="Kubernetes Guide" /></a> | [source](./kubernetes/readme.md) |
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| Learn about CI/CD tools :whale: | <a href="https://www.youtube.com/playlist?list=PLHq1uqvAteVsSsrnZimHEf7NJ1MlRhQUj" title="CI/CD"><img src="https://i.ytimg.com/vi/myCcJJ_Fk10/hqdefault.jpg" width="50%" alt="CI/CD Guide" /></a> | | | |
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| Deploy Kubernetes to the cloud :partly_sunny: | <a href="https://www.youtube.com/playlist?list=PLHq1uqvAteVsUhzNBkn-rPzXtPNpJu1-k" title="Cloud K8s"><img src="https://i.ytimg.com/vi/3jA9EfkSAUU/hqdefault.jpg" width="50%" alt="Cloud Guide" /></a> | [source](./kubernetes/cloud/readme.md) |
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| Monitoring Kubernetes :mag: | <a href="https://www.youtube.com/playlist?list=PLHq1uqvAteVuEXCrRkPFWLXRKWNLOVUHn" title="Cloud K8s"><img src="https://i.ytimg.com/vi/5o37CGlNLr8/hqdefault.jpg" width="50%" alt="Cloud Guide" /></a> | [source](./monitoring/prometheus/kubernetes/readme.md) |
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@ -1,4 +1,94 @@
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# Kubernetes Development Series <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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# 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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42
kubernetes/tutorial/deploy.yaml
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42
kubernetes/tutorial/deploy.yaml
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: wordpress-deployment
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labels:
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app: wordpress
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spec:
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replicas: 2
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selector:
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matchLabels:
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app: wordpress
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template:
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metadata:
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labels:
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app: wordpress
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spec:
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containers:
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- name: wordpress
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image: wordpress
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ports:
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- containerPort: 80
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env:
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- name: WORDPRESS_DB_HOST
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valueFrom:
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secretKeyRef:
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name: wordpress
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key: WORDPRESS_DB_HOST
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- name: WORDPRESS_DB_USER
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valueFrom:
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secretKeyRef:
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name: wordpress
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key: WORDPRESS_DB_USER
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- name: WORDPRESS_DB_PASSWORD
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valueFrom:
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secretKeyRef:
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name: wordpress
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key: WORDPRESS_DB_PASSWORD
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- name: WORDPRESS_DB_NAME
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valueFrom:
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secretKeyRef:
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name: wordpress
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key: WORDPRESS_DB_PASSWORD
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18
kubernetes/tutorial/ingress.yaml
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18
kubernetes/tutorial/ingress.yaml
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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name: wordpress
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annotations:
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nginx.ingress.kubernetes.io/rewrite-target: /
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spec:
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ingressClassName: nginx
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rules:
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- http:
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paths:
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- path: /
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pathType: Prefix
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backend:
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service:
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name: wordpress
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port:
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number: 80
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14
kubernetes/tutorial/service.yaml
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14
kubernetes/tutorial/service.yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: wordpress
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labels:
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app: wordpress
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spec:
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ports:
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- port: 80
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name: db
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targetPort: 80
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type: ClusterIP
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selector:
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app: wordpress
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66
kubernetes/tutorial/statefulset.yaml
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66
kubernetes/tutorial/statefulset.yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: mysql
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labels:
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app: mysql
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spec:
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ports:
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- port: 3306
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name: db
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type: ClusterIP
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selector:
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app: mysql
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---
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apiVersion: apps/v1
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kind: StatefulSet
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metadata:
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name: mysql
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spec:
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selector:
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matchLabels:
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app: mysql # has to match .spec.template.metadata.labels
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serviceName: "mysql"
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replicas: 1
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template:
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metadata:
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labels:
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app: mysql # has to match .spec.selector.matchLabels
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spec:
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terminationGracePeriodSeconds: 10
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containers:
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- name: mysql
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image: mysql:5.7
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ports:
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- containerPort: 3306
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name: db
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env:
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- name: MYSQL_DATABASE
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valueFrom:
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secretKeyRef:
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name: wordpress
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key: WORDPRESS_DB_PASSWORD
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- name: MYSQL_USER
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valueFrom:
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secretKeyRef:
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name: wordpress
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key: WORDPRESS_DB_USER
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- name: MYSQL_PASSWORD
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valueFrom:
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secretKeyRef:
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name: wordpress
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key: WORDPRESS_DB_PASSWORD
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- name: MYSQL_RANDOM_ROOT_PASSWORD
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value: "1"
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volumeMounts:
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- name: db
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mountPath: /var/lib/mysql
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volumeClaimTemplates:
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- metadata:
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name: db
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spec:
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accessModes: [ "ReadWriteOnce" ]
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storageClassName: "standard"
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resources:
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requests:
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storage: 500Mi
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