Session will give introduction to Kubernetes with Kind (Kubernetes in Docker). The idea is to showcase the strength of Kubernetes in a fun way.
Install:
- Kubectl (atleast 1.25.0)
- Docker Desktop
- Kind
- Lens --> They try to let you buy subscription but you can choose student license
- TightVNC
DISCLAIMER: https://kind.sigs.k8s.io/docs/user/quick-start/ Install Kind (Personally did it on Windows). You can download the .exe move it to a folder that you want and then add environment variable in system settings. Rename the file to kind.exe to make the kind command work.
Don't forget to also add it to your Path environment-variable
Reboot CMD and open it as Administrator, you should be able to use the kind command.
C:\Users\test-user>kind version
kind v0.17.0 go1.19.2 windows/amd64
The following command will be often used in the following parts
kubectl apply -f ...
You can also do a delete if something is not working properly
kubectl delete -f ...
kind delete cluster --name k8s-cluster
Perform following steps before starting the demo's
kind create cluster --name k8s-cluster --config cluster-ingress.yaml
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.5.1/deploy/static/provider/kind/deploy.yaml
You should automatically get access using kubectl to the cluster.
C:\Users\testuser>kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
ingress-nginx ingress-nginx-admission-create-65klx 0/1 Completed 0 29s
ingress-nginx ingress-nginx-admission-patch-vff69 0/1 Completed 0 29s
ingress-nginx ingress-nginx-controller-6bccc5966-rhf6m 0/1 Running 0 29s
kube-system coredns-565d847f94-mn2f6 1/1 Running 0 85s
kube-system coredns-565d847f94-v7954 1/1 Running 0 85s
kube-system etcd-k8s-cluster-control-plane 1/1 Running 0 100s
kube-system kindnet-bt4j2 1/1 Running 0 85s
kube-system kindnet-cx2wr 1/1 Running 0 68s
kube-system kindnet-nsknz 1/1 Running 0 68s
kube-system kube-apiserver-k8s-cluster-control-plane 1/1 Running 0 99s
kube-system kube-controller-manager-k8s-cluster-control-plane 1/1 Running 0 101s
kube-system kube-proxy-4p7zn 1/1 Running 0 68s
kube-system kube-proxy-vchlh 1/1 Running 0 68s
kube-system kube-proxy-vltqm 1/1 Running 0 85s
kube-system kube-scheduler-k8s-cluster-control-plane 1/1 Running 0 101s
local-path-storage local-path-provisioner-684f458cdd-l7d79 1/1 Running 0 85s
Kubernetes Dashboard is a Web UI application that visualizes the resources that are running on your Kubernetes Cluster.
kubectl apply -f 01-dashboard\complete.yaml
kubectl -n kubernetes-dashboard create token admin-user
Use generated token to login on https://localhost/dashboard
kubectl apply -f 02-rollingupgrades\complete.yaml
This will make the version application available on https://localhost/demo/version.
Perform a rolling upgrade by executing the following command
kubectl set image deployment/demo-version demo-version=tourna/demo:v2 -n demo-version
Refresh the page to see the new version applied.
kubectl apply -f 03-autoscaling\metrics.yaml
Wait until the following command returns a proper output
C:\Users\testuser>kubectl top nodes
NAME CPU(cores) CPU% MEMORY(bytes) MEMORY%
k8s-cluster-control-plane 246m 3% 879Mi 7%
k8s-cluster-worker 116m 1% 444Mi 3%
k8s-cluster-worker2 603m 7% 426Mi 3%
kubectl apply -f 03-autoscaling\app.yaml
kubectl apply -f 03-autoscaling\load.yaml
oc get hpa php-apache-hpa -n demo-hpa
oc describe hpa php-apache-hpa -n demo-hpa
Open Kubernetes Dashboard in the meantime to see pods being created and deleted. You can clean it up by performing following command
kubectl delete -f 03-autoscaling\load.yaml
TODO: FIX THIS IN FIRST CLUSTER
kind create cluster --name kubedoom --config cluster-kubedoom.yaml
kubectl apply -f 04-kubedoom/
User vncviewer to localhost:5900 and password is idbehold