Kubernetes Cheatsheet

Kubernetes is a portable, extensible, open-source platform for managing containerized workloads and services, that facilitates both declarative configuration and automation. It has a large, rapidly growing ecosystem. Kubernetes services, support, and tools are widely available. Kubernetes provides you with a framework to run distributed systems resiliently. It takes care of scaling and failover for your application, provides deployment patterns, canary deployments, and more. In this blog post, I will mention Kubernetes commands which we need for most of the use-cases.

I will list down kubectl commands in the sections below as a quick reference to work with Kubernetes.

List Resources

Create Resources

Update Resources

Display the State of Resources

Delete Resources

Execute Command

Print Container Logs

Modify Kubeconfig Files

List Resources

Get list of all namespaces

kubectl get namespaces

Get list of all pods

kubectl get pods

Get list of all pods with detailed information like IP, Node Name etc...

kubectl get pods -o wide

Get list of all pods running on a particular node server

kubectl get pods --field-selector=spec.nodeName=[server-name]

Get list of all replication controllers and services

kubectl get replicationcontroller,services

Get list of daemonsets

kubectl get daemonset

Create Resources

Create a new namespace

kubectl create namespace [namespace-name]

Create a new namespace from JSON or YAML file.

kubectl create –f [filename]

Update Resources

To apply or update a resource use the kubectl apply command.

Create a new service with the definition contained in [service-config].yaml

kubectl apply -f [service-config].yaml

Create a new replication controller with the definition contained in [controller-config].yaml

kubectl apply -f [controller-config].yaml

Create the objects defined in any .yaml, .yml, or .json file in a directory

kubectl apply -f [yaml-file/directory-name]

Edit a service config

kubectl edit svc/[service-name]

Above command opens the file in your default editor. To choose another editor, specify it in front of the command:

KUBE_EDITOR=”[editor-name]” kubectl edit svc/[service-name]

Display the State of Resources

Get Details about Particular Node

kubectl describe nodes [node-name]

Get Details about a Particular pod

kubectl describe pods [pod-name]

Get Details about a Particular pod whose name and type are listed in pod.json

kubectl describe –f pod.json

Get Details about a Particular pod managed by a specific replication controller

kubectl describe pods [replication-controller-name]

Get Details about all pods

kubectl describe pods

Delete Resources

Delete a pod using the name and type mentioned in pod.yaml

kubectl delete -f pod.yaml

Delete all pods and services with a specific label

kubectl delete pods,services -l [label-key]=[label-value]

Delete all pods

kubectl delete pods --all

Execute Command

Get output from a command run on the first container in a pod

kubectl exec [pod-name] -- [command]

Get output from a command run on a specific container in a pod

kubectl exec [pod-name] -c [container-name] -- [command]

Run /bin/bash from a specific pod. The received output comes from the first container

kubectl exec -ti [pod-name] -- /bin/bash

Print Container Logs

Print Logs from Pod

kubectl logs [pod-name]

Stream Logs from Pod

kubectl logs -f [pod-name]

Tail Logs from Pod (Print last 200 logs from pod)

kubectl logs --tail=200 [pod-name]

Modify Kubeconfig Files

kubectl config command lets you view and modify kubeconfig files.

Get Current Context

kubectl config current-context

Set cluster entry in kubeconfig

kubectl config set-cluster [cluster-name] --server=[server-name]

Unset an entry in kubeconfig

kubectl config unset [property-name]

Thank you for reading

Hope you find these resources useful. If you like what you read and want to see more about system design, microservices, and other technology-related stuff... You can follow me on

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