Homework 10. Kubernetes installation (WS)

Yuliya_Buyalskaya/10.Kubernetes.installation/README.md

@@ -0,0 +1,146 @@
+## Homework Assignment 1. K8s Installation
+
+Install kubectl
+```shell
+curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
+sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
+```
+Copy config files
+```shell
+scp root@192.168.208.3:/root/.kube/config /home/user/.kube/config-k8s
+scp root@192.168.203.2:/etc/rancher/k3s/k3s.yaml /home/user/.kube/config-k3s
+```
+Update them
+
+![config-k8s](../10.Kubernetes.installation/pictures/1.jpg)
+![config-k3s](../10.Kubernetes.installation/pictures/2.jpg)
+
+Export kube configs and create tunnels
+```shell
+export KUBECONFIG=$HOME/.kube/config-k8s:$HOME/.kube/config-k3s
+ssh -L 6443:127.0.0.1:6443 root@192.168.208.3 -f -N
+ssh -L 6444:127.0.0.1:6443 root@192.168.203.2 -f -N
+```
+
+Install k9s
+```shell
+wget  https://github.com/derailed/k9s/releases/download/v0.32.7/k9s_linux_amd64.deb
+dpkg -i k9s_linux_amd64.deb
+```
+
+View all pods in each cluster using k9s (search by :pod all @k8s-cluster)
+
+![config-k8s](../10.Kubernetes.installation/pictures/3.jpg)
+![config-k3s](../10.Kubernetes.installation/pictures/4.jpg)
+
+Create pod
+```yamll
+apiVersion: v1
+kind: Pod
+metadata:
+  name: shell-pod
+spec:
+  containers:
+  - image: busybox
+    command: ["/bin/sh", "-ec", "sleep 604800"]
+    imagePullPolicy: IfNotPresent
+    name: shell-pod
+```
+
+```shell
+user@vm5:~$ kubectl apply -f pods/shell-pod.yaml
+pod/shell-pod created
+user@vm5:~$ kubectl get pods
+NAME        READY   STATUS    RESTARTS   AGE
+shell-pod   1/1     Running   0          112s
+```
+
+Create failed pod
+```yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: shell-pod
+spec:
+  containers:
+  - image: busybox
+    command: ["/bin/sh", "-ec", "sleep 604800"]
+    imagePullPolicy: IfNotPresent
+    name: shell-pod
+```
+
+```shell
+user@vm5:~$ kubectl apply -f pods/failed-pod.yaml
+pod/failed-pod created
+user@vm5:~$ kubectl get pods
+NAME         READY   STATUS             RESTARTS      AGE
+failed-pod   0/1     CrashLoopBackOff   1 (11s ago)   12sshell-pod    1/1     Running            1 (30m ago)   52m
+```
+
+Write [github workflow](https://github.com/Julie717/kubernetes/blob/10-kubernetes-installation/.github/workflows/check-pods.yaml) to check if there are any failed pods
+
+```shell
+name: Check status of pods
+
+on:
+  push:
+    branches:
+      - 10-kubernetes-installation
+      - master
+
+jobs:
+  check-pods-status:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check status of pods
+        id: pods-status
+        uses: appleboy/ssh-action@v1.2.0
+        with:
+          host: ${{ secrets.HOST }}
+          username: ${{ secrets.USERNAME }}
+          password: ${{ secrets.KEY }}
+          proxy_host: ${{ secrets.PROXY_HOST }}
+          proxy_port: ${{ secrets.PROXY_PORT }}
+          proxy_username: ${{ secrets.PROXY_USERNAME }}
+          proxy_password: ${{ secrets.PROXY_KEY }}
+          script: |
+            FAILED_PODS=`kubectl get pods -A | awk '$4!="Running" && $4!="Succeeded" { print $2 }' | tail +2`
+            echo "$FAILED_PODS" > failed_pods.txt
+
+      - name: Copy file
+        uses: nicklasfrahm/scp-action@main
+        with:
+          host: ${{ secrets.HOST }}
+          username: ${{ secrets.USERNAME }}
+          key: ${{ secrets.SSH_KEY }}
+          insecure_ignore_fingerprint: true
+          proxy_host: ${{ secrets.PROXY_HOST }}
+          proxy_port: ${{ secrets.PROXY_PORT }}
+          proxy_username: ${{ secrets.PROXY_USERNAME }}
+          proxy_key: ${{ secrets.PROXY_SSH_KEY }}
+          proxy_fingerprint: true
+          insecure_proxy_ignore_fingerprint: true
+          direction: download
+          source: "/root/failed_pods.txt"
+          target: "./failed_pods.txt"
+
+      - name: Read result
+        id: result
+        run: |
+          echo "FAILED_PODS=$(cat ./failed_pods.txt)" >> $GITHUB_OUTPUT
+      - name: Report to Slack
+        if: steps.result.outputs.FAILED_PODS != ''
+        uses: rtCamp/action-slack-notify@v2
+        env:
+          SLACK_CHANNEL: app
+          SLACK_COLOR: failure
+          SLACK_MESSAGE: "There were found failed pods: ${{ steps.result.outputs.FAILED_PODS }}"
+          SLACK_TITLE: Some pods have failed
+          SLACK_USERNAME: rtCamp
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+```
+[Result of running job](https://github.com/Julie717/kubernetes/actions/runs/12836952372):
+
+![job](../10.Kubernetes.installation/pictures/5.jpg)
+![report to slack](../10.Kubernetes.installation/pictures/6.jpg)

Yuliya_Buyalskaya/README.md

@@ -6,4 +6,5 @@
 [Homework 06. Ansible Workshop](../Yuliya_Buyalskaya/06.Ansible.Workshop/README.md) \
 [Homework 07. Docker](../Yuliya_Buyalskaya/07.Docker/README.md) \
 [Homework 08. Docker. Docker compose](../Yuliya_Buyalskaya/08.Docker.Docker-compose/README.md) \
-[Homework 09. Kubernetes](../Yuliya_Buyalskaya/09.Kubernetes/README.md)
+[Homework 09. Kubernetes](../Yuliya_Buyalskaya/09.Kubernetes/README.md) \
+[Homework 10. Kubernetes installation (WS)](../Yuliya_Buyalskaya/10.Kubernetes.installation/README.md)