There are multiple resources for the Kubernetes kubectl command line reference. It is very good practice to learn the usage of all those commands. But, here I would like to share the most day to day commands that we use on the terminal to take care of our daily development and debugging activities with respect to Kubernetes.

# To get the current context
$ kubectl config current-context

# To Display list of contexts
$ kubectl config get-contexts

# Now, create the namespace in the cluster
$ kubectl create namespace <your namespace name>

# Use the namespace for the subsequent kubectl operations
$ kubectl config set-context --namespace=<your namespace name> --current

Namespace Commands

# Describe the namespace
$ kubectl describe namespace <your namespace name>

# Get the namespace details either in yaml or json
$ kubectl get namespace blog-ns -o json
$ kubectl get namespace blog-ns -o yaml

# To list all the resources under a namespace
$ kubectl get all -n <your namespace name>

ConfigMap and Secretes Commands

# Create a config map
$ kubectl create configmap <name of the config map> --from-literal=username=user --from-literal=hostname=host

# Create a secret
# Remember Secretes are namespace specific, they can not be accessed across the namespaces
$ kubectl create secret generic <secret name> --from-literal=<key>=<value>

# Whenever you store a secret, you should store them in a base64 format
$ echo -n <your password> | base64

# To decode the value
$ echo -n 'base 64 value' | base64 -decode

Deployment and Pod Commands

# List all the pods in all namespaces
$ kubectl get pods --all-namespaces 

# Create a POD quickly
$ kubectl run <pod name> --image=busybox --restart=Never -n <your namespace>

# In some cases, you just need the pod yaml
$ kubectl run <pod name> --image=nginx --dry-run=client --restart=Never -n <your namespace> -o yaml

# Rolling Update of the deployment image
$ kubectl set image deployment/<deployment name> <containername>=<new image name>

# Restart the deployment
$ kubectl rollout restart deployment/<deployment name>

# To undo the rollout
$ kubectl rollout undo deployment/<deployment name>

# To know the rollout history of a deployment
$ kubectl rollout history deployment <deployment name>

# To view the logs
$ kubectl logs <podname> --namespace=<namespace name>

# To open the interactive shell to the pod
$ kubectl exec -it <pod name> --namespace=<namespace name> -- /bin/sh

# To check the evens on the pod
$ kubectl describe pod <pod name> | grep -C 10 Events:

# Extract a pod definition yaml file to local file
$ kubectl get pod <podname> -o yaml > <local pod filename>.yaml

Searching or Listing Commands

# List the resources in a sorted order by any of the metadata
$ kubectl get services --sort-by=.metadata.name

# Get the particular fields displayed from the resources
# If it is a list then, use names[*].abc
$ kkubectl get services -A -o custom-columns='NAME:metadata.name'

# List the resources with specific label
$ kubectl get pod -l <label name>=<label value>
$ kubectl get pods --selector <label name>=<label value>

# To list all of the resources matching with the label
$ kubectl get all --selector <lable name>=<label value>

All the above command reference is the typical actions we do as a Cloud Developer/Engineer in our day to day activities. But for more references the ocean like documentation available at here