Cheetsheet
https://kubernetes.io/docs/reference/kubectl/cheatsheet/

kubectl get nodes -o wide

kubectl get nodes
kubectl get services
kubectl apply -f azure-vote.yaml
kubectl get service azure-vote-front --watch
kubectl get secret
kubectl expose deployment deployment-name --type=LoadBalancer --name=my-service-name
https://kubernetes.io/docs/tutorials/stateless-application/expose-external-ip-address/

kubectl get secrets
kubectl describe secret/db-credentials-c2hd54k784

access the pod’s bash shell:
kubectl exec -it [pod] -- /bin/bash

Get pod's logs:
kubectl logs -f pinot-zookeeper-0 --namespace=pinot-quickstart

Confimap:
kubectl get configmaps
kubectl describe configmaps configmap-name

Create the configmap from file

kubectl create configmap game-config --from-file=configure-pod-container/configmap/
Apply configmap yml:
kubectl apply -k .

kubectl apply -f azure-vote.yaml

kubectl get pods --namespace=

Fixing terminating status
kubectl patch pv jhooq-pv -p '{"metadata":{"finalizers":null}}'
kubectl patch pvc jhooq-pv-claim -p '{"metadata":{"finalizers":null}}'

restart the pod:
kubectl get pod pinot-controller-0 -n pinot-quickstart -o yaml | kubectl replace --force -f -

Create namespace
kubectl create ns pinot

Add domain dns name:
(add it under annotations tag)con

service.beta.kubernetes.io/azure-dns-label-name: label_name

kubectl apply -k . --namespace=namespacename
kubectl logs -f --namespace=namespacename
kubectl get pod -n namespacename -o yaml | kubectl replace --force -f -

kubectl describe configmaps confimapname --namespace=namespacename

kubectl delete pod -n kube-system -l k8s-app=kube-dns

Create tls lincese

openssl genrsa -out tls.key 2048
openssl req -new -key tls.key -out tls.csr
openssl x509 -req -days 365 -in tls.csr -signkey tls.key -out tls.crt

Install ingress
https://platform9.com/learn/v1.0/tutorials/nginix-controller-via-yaml

Caddy ingress
https://markheath.net/post/simple-aks-https-with-caddy
kubectl create namespace caddy-system
sudo kubectl apply -f mycaddy.yaml
kubectl apply -f caddyingress_hostname.yaml
kubectl create secret tls mycerts --key ./tls.key --cert ./tls.crt -n servicenamespacename

Deleting all pods and ingress then add ingress with certs.

Fix error:
failed calling webhook "validate.nginx.ingress.kubernetes.io": failed to call webhook: Post "https://ingress-nginx-controller-admission.ingress-basic.svc:443/networking/v1/ingresses?timeout=10s": service "ingress-nginx-controller-admission" not found
:
kubectl delete -A ValidatingWebhookConfiguration ingress-nginx-admission

PFX file to crt file
https://ibm.com/docs/en/arl/9.7?topic=certification-extracting-certificate-keys-from-pfx-file

Spark setup
https://testdriven.io/blog/deploying-spark-on-kubernetes/

How to check space left of pod
kubectl -n pinot exec pinot-zookeeper-0 -- df -ah

Remove table from pinot with name like new
Change the logging level for docker thingstack

Get docker log file path - docker inspect --format='{{.LogPath}}' $INSTANCE_ID
Command to clear docker log - truncate -s 0 /home/document/path

How to run command inside the kubenetetes pod
kubectl exec -it spark-master-59dd99bf6-j46p9 -- /bin/bash -c "ls"

Kubernetes developer notes

Create the configmap from file