some commands about kubectl

kubectl

kubectl delete pods --all --all-namespaces
kubectl delete pod websocket-server-service

kubectl delete --all pods --namespace=foo

kubectl delete --all deployments --namespace=foo

kubectl delete --all namespaces

```bash
for each in $(kubectl get ns -o jsonpath="{.items[*].metadata.name}" | grep -v kube-system);
do
  kubectl delete ns $each
done
```

kubectl get pods --all-namespaces

// usage of `kubectl describe`, and we can find the `apisix-b8865dfcf-hd45m` by the second or third command.
kubectl describe pod  apisix-b8865dfcf-hd45m -n apisix
kubectl get pods -n apisix -l app.kubernetes.io/name=apisix -o name
kubectl get pods -n apisix

kubectl apply -f dev.yaml
kubectl delete -f dev.yaml

// kubectl logs!!!
kubectl  logs apisix-6f7d4f7894-wcv8f -n apisix

// kubectl and expose service
kubectl expose deployment hello-world --type=ClusterIP --name=my-service
kubectl get services my-service
kubectl get services --all-namespaces
kubectl delete service my-service

// run backend services
kubectl create ns demo
kubectl -n demo run httpbin --image-pull-policy=IfNotPresent --image kennethreitz/httpbin --port 80
kubectl -n demo expose pod httpbin --port 80

// enter terminal
kubectl exec -it -n ingress-apisix apisix-7d6b8577b6-x2xrv -- /bin/bash
# apisix-7d6b8577b6-x2xrv can be get by command `kubectl get pods --all-namespaces`

// troubleshooting
kubectl describe ar -n {namespaces}
kubectl describe pods pod-XXX
kubectl logs pod-XXX
kubectl logs pod-XXX -c init-container-XXX

// configmap
kb get configmap apisix-configmap -o json -n ingress-apisix-1

// Get NodePort IP Address
kubectl get pod -o wide --selector app=frontend