kubectl commands Flashcards
Show Merged kubeconfig settings
kubectl config view
Use multiple kubeconfig files at the same time
KUBECONFIG=~/.kube/config:~/.kube/kubconfig2
Get the password for the e2e user
kubectl config view -o jsonpath=’{.users[?(@.name == “e2e”)].user.password}’
Display list of contexts
kubectl config get-contexts
Display the current-context
kubectl config current-context
Set the default context to my-cluster-name
kubectl config use-context my-cluster-name
Add a new user to your kubeconf that supports basic auth
kubectl config set-credentials kubeuser/foo.kubernetes.com –username=kubeuser –password=kubepassword
Permanently save the namespace for all subsequent kubectl commands in that context
kubectl config set-context –current –namespace=ggckad-s2
Set a context utilizing a specific username and namespace
kubectl config set-context gce –user=cluster-admin –namespace=foo && kubectl config use-context gce
Delete user foo
kubectl config unset users.foo
Create resource(s)
kubectl apply -f ./my-manifest.yaml
Create from multiple files
kubectl apply -f ./my1.yaml -f ./my2.yaml
Create resource(s) in all manifest files in dir
kubectl apply -f ./dir
Create resource(s) from url
kubectl apply -f https://git.io/vPieo
Start a single instance of nginx
kubectl create deployment nginx –image=nginx
Get the documentation for pod manifests
kubectl explain pods
List all services in the namespace
kubectl get services
List all pods in all namespaces
kubectl get pods –all-namespaces
List all pods in the current namespace, with more details
kubectl get pods -o wide
List a particular deployment
kubectl get deployment my-dep
List all pods in the namespace
kubectl get pods
Get a pod’s YAML
kubectl get pod my-pod -o yaml
Get nodes detail with verbose output
kubectl describe nodes my-node
Get a pod’s YAML
kubectl get pod my-pod -o yaml
Get nodes detail with verbose output
kubectl describe nodes my-node
Get pods detail with verbose output
kubectl describe pods my-pod
List Services Sorted by Name
kubectl get services –sort-by=.metadata.name
List pods Sorted by Restart Count
kubectl get pods –sort-by=’.status.containerStatuses[0].restartCount’
List PersistentVolumes sorted by capacity
kubectl get pv –sort-by=.spec.capacity.storage
Get the version label of all pods with label app=cassandra
kubectl get pods –selector=app=cassandra -o jsonpath=’{.items[*].metadata.labels.version}’
Retrieve the value of a key with dots, e.g. ‘ca.crt’
kubectl get configmap myconfig -o jsonpath=’{.data.ca.crt}’
Get all worker nodes (use a selector to exclude results that have a label named ‘node-role.kubernetes.io/master’)
kubectl get node –selector=’!node-role.kubernetes.io/master’
Get all running pods in the namespace
kubectl get pods –field-selector=status.phase=Running
Get ExternalIPs of all nodes
kubectl get nodes -o jsonpath=’{.items[*].status.addresses[?(@.type==”ExternalIP”)].address}’
List Events sorted by timestamp
kubectl get events –sort-by=.metadata.creationTimestamp
Show labels for all pods (or any other Kubernetes object that supports labelling)
kubectl get pods –show-labels
List all Secrets currently in use by a pod
kubectl get pods -o json | jq ‘.items[].spec.containers[].env[]?.valueFrom.secretKeyRef.name’ | grep -v null | sort | uniq
Compares the current state of the cluster against the state that the cluster would be in if the manifest was applied.
kubectl diff -f ./my-manifest.yaml
