Kubernetes

kubectl

Commands	Descriptions
kubectl config get-contexts	List all the contextsin your kubeconfig file.
kubectl config current-context	Display current context.
kubectl config use-context <context name>	Sets the current-context to the specified context.
kubectl apply -f <config file/directory>	This will apply configuration to a resource. This will create the resource if the resource does not exist yet.
kubectl apply -f <config file/directory>	This will delete resources created by the yaml file.
kubectl rollout status deployment <name>	Watches the rollout status of a deployment. Eg., kubectl rollout status deployment my-app-depl
kubectl rollout restart deployment <name>	Restarts a resource. This will also pull the latest container images. Eg., kubectl rollout restart deployment my-app-depl
kubectl get all	List all resources
kubectl get <resources>	List a specific resource. Eg., kubectl get pods
kubectl get pods --watch	Watches pod status updates.
kubectl explain <resource>	List the fields of a resource. Eg., kubectl explain deployment
kubectl describe <resource>	Prints a detailed description of the selected resource. Eg., kubectl describe deployment kubectl describe pods -l name=myLabel
kubectl api-resources	Show supported API resources (kinds).
kubectl api-versions	Show supported API versions.
kubectl exec -it <pod name> -- <command>	Access the pod container. Eg., kubectl exec -it my-app-depl-65c67ff97c-jtxhs -- bash

Imperative commands

Declarative approach is recommended, but there are some exemptions, such as when you're creating secrets.

Commands	Descriptions
kubectl create secret generic <secret_name> --from-literal <KEY>=<VALUE>	Create a secret based on specified literal value.
kubectl create deployment <name> --image <image>	Create a deployment. Eg., kubectl create deployment my-nginx --image nginx
kubectl create deployment <name> --image <image> --dry-run -o yaml	Print out the object ina yaml format. This will not actually send the object. Eg., kubectl create deployment my-nginx --image nginx --dry-run -o yaml
kubectl expose deployment <name> --port <port>	Creates a ClusterIP service for a deployment. Eg., kubectl expose deployment my-nginx --port 8080
kubectl expose deployment <name> --port <port> --type NodePort	Creates a NodePort service for a deployment. Eg., kubectl expose deployment my-nginx --port 8888 --type NodePort
kubectl expose deployment <name> --port <port> --type LoadBalancer	Creates a LoadBalancer service for a deployment. Eg., kubectl expose deployment my-nginx --port 8080 --type LoadBalancer

ingress-nginx	Ingress controller for Kubernetes using NGINX as a reverse proxy and load balancer.
cert-manager	Kubernetes add-on to automate the management and issuance of TLS certificates from various issuing sources.