Some useful Kubectl commands
1.)kubectl -f apply <file.yaml/folder_name> #Will deploy the YAML file(s) to the cluster.
2.)kubectl get all #Will list all the kubernetes objects in the cluster
3.)kubectl get pods/deployment/svc/rs #Will list the pods/deployment/service/replicasets on the cluster
4.)kubectl delete po — all #Will delete all the pods in the cluster
5.)kubectl delete <object><object_name> #Will delete the specific object from the cluster
6.)kubectl describe <object><object_name> #Will describe all the properties of the Kubernetes object in the cluster
7.)kubectl desccribe <object><object_name> -n <namespace> #Will describe the properties of the Kubernetes object in a given namespace. Note: when the namespace is default, it isn’t mentioned.
8.)kubectl rollout status <object><object_name> #Will describe the rollout status of the Kubernetes object.
9.)kubectl rollout history <object>/<object_name> #Will describe the rollout history of the Kubernetes object.
10.)kubectl exec -it <object_name> — /bin/sh #Get inside the shell of the Kuberenets object
11.)kubectl create secret docker-registry <name_of_secret_key> — docker-server=<utl of the private registry> — docker-username=<username>— docker-password=<password> — docker-email=<email_id> #Will create a secret key for the Kubernetes object which can then be used inside the YAML to pull the object from the private registry to the Kubernetes cluster.
12.)kubectl get ns #Will list the namespaces.
13.)kubectl get po -n-kube-system #Will list the pods in kube-system namespace
14.)kubectl get all -n-kube-system #Will list all the Kubernetes objects in the kube-system namespace
15.) ns lookup <service_name> #Will lookup for the service inside another pod from a different pod’s shell
16.) netstat -tunelp #Will list the ports inside the pod
17.) kubectl apply -f . #Will deploy all the files in the current context
18.) kubectl delete -f . #Will delete all the files in the current context
19.) kubectl logs <pod_name> #Will shiw the logs of the pods
20.)kubectl top pod #Will list the memory and CPU utilization of all the pods
21.)kubectl top nodes #Will list memory and CPU utilization of all the nodes
22.) kubectl get nodes — show-labels #Will show the labels of the nodes
23.) kubectl label nodes <node_name> <label_key:label_value> #Will add a label name(label_key:label_value) to the respective deployments. This is important if we have mentioned a nodeSelector property for our deployments which means that our deployment will run on only those node that has the same nodeSelector name(which a key-value pair).
