Kubernetes cheat sheet
Listing the below commands which will be useful for administering the kubernetes environment.
Version:
# Get kubernetes version: The Server Version line indicates the version of Kubernetes that is running on the Kubernetes cluster.
kubectl version
Pods:
# Get the details of all pods in one namespace
kubectl get pods -n <namespace>
# Get the details of all pods in all namespaces
kubectl get pods --all-namespaces
# Get the details of all pods in the current namespace, with more details
kubectl get pods -o wide
Deployments:
# Get all the deployments
kubectl get deployments
# Check the history of deployments including the revision
Kubectl rollout history deployment <deployment name>
# Rolling restart of the deployment
Kubectl rollout restart deployment <deployment name>
Interacting with pods:
# Login to pod
Kubectl exec -it <podname> -- bash
#Run the commands in the pod
Kubectl exec <podname> -- ls /
configmap :
# Get all configmap in current namespace
Kubectl get cm
# Edit configmap
Kubectl edit cm <configmap name>
Secrets:
# Display all the secrets
Kubectl get secrets
# Display all the secrets
Kubectl get secrets --all-namespaces
Services:
# Display all the services
Kubectl get svc
# List Services Sorted by Name
kubectl get services --sort-by=.metadata.name
Logs:
# Check the logs of the pod
kubectl logs <podname>
# Tail the logs of the pod
kubectl logs -f <podname>
Copy :
# copy the data from local directory to the pod
kubectl cp $HOME/data <pod>:/opt/app/data
Storage:
# List all PersistentVolumes
kubectl get pv
# List all PersistentVolumes sorted by capacity
kubectl get pv --sort-by=.spec.capacity.storage
# Describe specific persistent volume
kubectl describe pv <pv_name>
# List all persistent volumes claims
kubectl get pvc
# Describe specific persistent volume claim
kubectl describe pvc <pvc_name>
Create/Delete resources:
# Create specific resource
kubectl apply -f <deployment>.yaml
# Create specific resource using URL
kubectl apply -f https://gcs.io/pod
# Describe specific persistent volume claim
kubectl delete -f <deployment>.yaml
Formatting output:
# Append the following to command to get output in json format
-o json
# Append the following to command to get output in yaml format
-o yaml
# Append the following to command to get output in plain text format with additional information for pods.
-o wide
# Print a table using a comma separated list of custom columns
-o=custom-columns=<spec>
Cluster details:
# Display the cluster details
kubectl cluster-info
Below bash alias are more useful:
alias k="kubectl"
alias allpods="kubectl get pods --all-namespaces"
alias kc="kubectl create -f"
alias kg="kubectl get"
alias pods="kubectl get pods"
alias ktop="kubectl top nodes"
alias rcs="kubectl get rc"
alias sv="kubectl get services"
alias dep="kubectl get deployment"
alias kd="kubectl describe"
alias kdp="kubectl describe pod "
alias kds="kubectl describe service "
alias nodes="kubectl get nodes"
alias klogs="kubectl logs"
alias ns="kubectl get ns"
alias deploys="kubectl get deployment"
alias events="kubectl get events"
alias kexec="kubectl exec -it "
alias sec="kubectl get secrets"