Lab9

LAB9.md

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+# 9
+
+## k8s
+
+In this lab you need to get familiar with `Kubernetes`. Setup local development environment and prepare a
+few manifests for your application.
+
+### 10 points
+
+1. Read about `Kubernetes`:
+    * [K8s](https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/)
+    * [K8s components](https://kubernetes.io/docs/concepts/overview/components/)
+
+2. Install `kubectl` and `minikube`:
+    * [Tools](https://kubernetes.io/docs/tasks/tools/)
+
+3. Deploy your application in the `minikube`. Use the `kubectl` create command to create a `Deployment`:
+    * [Example](https://kubernetes.io/docs/tutorials/hello-minikube/#create-a-deployment)
+    * [Overview](https://kubernetes.io/docs/tutorials/kubernetes-basics/deploy-app/deploy-intro/)
+
+4. Make your application accessible from outside the `Kubernetes` virtual network. Create a `Service` for it:
+    * [Example](https://kubernetes.io/docs/tutorials/hello-minikube/#create-a-service) - 
+    * [Overview](https://kubernetes.io/docs/tutorials/kubernetes-basics/expose/expose-intro/)
+
+5. Create a `k8s` folder in your repository and create a `README.md` report inside, provide the output of
+`kubectl get pods,svc` command.
+
+6. Clean up. Remove `deployment` and `service` that you created.
+
+7. As you see it wasn't convenient way to manage your app. Use configuration files to deploy your application. Create a `deployment.yml` manifest for it. Set up at least 3 replicas:
+    * [Deployment](https://kubernetes.io/docs/concepts/workloads/controllers/deployment/)
+    * [Declarative Management of Kubernetes Objects Using Configuration Files](https://kubernetes.io/docs/tasks/manage-kubernetes-objects/declarative-config/)
+
+8. Create a `service.yml` manifest for your app.
+    * [Service](https://kubernetes.io/docs/concepts/services-networking/service/)
+
+9. Provide those files in the `k8s` folder. Also provide the output of `kubectl get pods,svc` command in
+the report. Provide output of `minikube service --all` command and result from your browser. The screenshot for the latter should show the same IP as in the `minikube service --all` output.
+
+10. Create a PR to the forked repo lab8 branch, ask your teammates to review it and review PRs of your teammates.
+
+11. Create a PR in your own repository from the lab9 branch to the lab8 one. It will help us with grading.
+
+### List of requirements
+
+* `deployment.yml`
+* `service.yml`
+* output of `kubectl get pods,svc` in README.md in the `k8s` folder
+* output of `minikube service --all` in README.md in the `k8s` folder
+* screenshot from a browser that shows the same ip as in the latter command.
+
+## Bonus
+
+### 2 points
+
+1. Create `deployment` and `service` manifests for your extra app.
+
+2. Read about `Ingress, Ingress controller, StatefulSet, DaemonSet, PersistentVolumes`, provide the explanation in a nutshell, as you understand it. No copy paste.

k8s/README.md

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+# Manual approach
+
+```
+$ kubectl get pods,svc
+
+NAME                              READY   STATUS    RESTARTS   AGE
+pod/python-app-869dc76fc7-tkj7t   1/1     Running   0          45s
+
+NAME                 TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
+service/kubernetes   ClusterIP      10.96.0.1        <none>        443/TCP          66s
+service/python-app   LoadBalancer   10.106.114.165   <pending>     8080:30398/TCP   16s
+```
+
+# Config approach
+
+```
+$ kubectl get pods,svc
+
+NAME                                         READY   STATUS    RESTARTS   AGE
+pod/python-app-deployment-7dd784648c-9mg78   1/1     Running   0          75s
+pod/python-app-deployment-7dd784648c-jldvb   1/1     Running   0          75s
+pod/python-app-deployment-7dd784648c-lnbcz   1/1     Running   0          75s
+
+NAME                 TYPE           CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
+service/kubernetes   ClusterIP      10.96.0.1        <none>        443/TCP          13m
+service/python-app   LoadBalancer   10.108.134.239   <pending>     8080:31471/TCP   75s
+```
+
+```
+$ minikube service --all
+
+|-----------|------------|-------------|--------------|
+| NAMESPACE |    NAME    | TARGET PORT |     URL      |
+|-----------|------------|-------------|--------------|
+| default   | kubernetes |             | No node port |
+|-----------|------------|-------------|--------------|
+😿  service default/kubernetes has no node port
+|-----------|------------|-------------|---------------------------|
+| NAMESPACE |    NAME    | TARGET PORT |            URL            |
+|-----------|------------|-------------|---------------------------|
+| default   | python-app |        8080 | http://192.168.49.2:31471 |
+|-----------|------------|-------------|---------------------------|
+🏃  Starting tunnel for service kubernetes.
+🏃  Starting tunnel for service python-app.
+|-----------|------------|-------------|------------------------|
+| NAMESPACE |    NAME    | TARGET PORT |          URL           |
+|-----------|------------|-------------|------------------------|
+| default   | kubernetes |             | http://127.0.0.1:54335 |
+| default   | python-app |             | http://127.0.0.1:54337 |
+|-----------|------------|-------------|------------------------|
+🎉  Opening service default/kubernetes in default browser...
+🎉  Opening service default/python-app in default browser...
+❗  Because you are using a Docker driver on windows, the terminal needs to be open to run it.
+```
+
+## Screenshot
+
+![Screenshot](screenshot.png)
+

k8s/deployment.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: python-app-deployment
+  labels:
+    app: python-app
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: python-app
+  template:
+    metadata:
+      labels:
+        app: python-app
+    spec:
+      containers:
+        - name: python-app
+          image: draeston/devops_app:latest
+          ports:
+          - containerPort: 8080

k8s/service.yml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: python-app
+  labels:
+    app: python-app
+spec:
+  selector:
+    app: python-app
+  type: LoadBalancer
+  ports:
+    - protocol: TCP
+      port: 8080
+      targetPort: 3000