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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    Kubernetes Cheatsheet