CKA - Kubectl Command List

Related Notes

• CKA Index
• CKA - Application Lifecycle Management
• CKA - Metrics Logging
• CKA - Kubectl Exam 20 Commands
• CKA - Personal Notes

Fast Habits

• alias k=kubectl
• export do="--dry-run=client -o yaml"
• export now="--force --grace-period 0"

Context and Namespace

• k config get-contexts
• k config use-context <context-name>
• k config set-context --current --namespace=<ns>
• k get ns

Cluster and Node Checks

• k cluster-info
• k get nodes -o wide
• k describe node <node-name>
• k top nodes

Pod Operations

• k get pods -A -o wide
• k describe pod <pod> -n <ns>
• k logs <pod> -n <ns>
• k logs <pod> -c <container> -n <ns>
• k logs -f <pod> -n <ns>
• k exec -it <pod> -n <ns> -- sh
• k delete pod <pod> -n <ns> $now
• kubectl get pods --show-labels
• kubectl get pods -l <key>=<value>

Create Resources Imperatively

• k create deployment <name> --image=<image>
• k create deployment <name> --image=<image> --replicas=3
• k run <name> --image=<image> --restart=Never
• k run <name> --image=<image> --restart=Never $do > pod.yaml
• k create service clusterip <svc> --tcp=80:8080
• k create service nodeport <svc> --tcp=80:8080 --node-port=30080
• k expose deployment <dep> --port=80 --target-port=8080 --type=ClusterIP

YAML and Apply Flow

• k create deployment <name> --image=<image> $do > dep.yaml
• k apply -f <file>.yaml
• k apply -f <dir>/
• k replace -f <file>.yaml
• k diff -f <file>.yaml
• k edit <resource> <name>

Rollouts and Scaling

• k get deploy
• k scale deployment <dep> --replicas=5
• k rollout status deployment/<dep>
• k rollout history deployment/<dep>
• k rollout undo deployment/<dep>
• k set image deployment/<dep> <container>=<image>:<tag>

Labels, Selectors, Annotations

• k label pod <pod> env=prod --overwrite
• k get pods -l env=prod
• k annotate pod <pod> owner=cka --overwrite
• k get pods --show-labels

ConfigMaps and Secrets

• k create configmap <name> --from-literal=key=value
• k create configmap <name> --from-file=<file>
• k create secret generic <name> --from-literal=password=abc123
• k create secret generic <name> --from-file=<file>
• k get secret <name> -o yaml

Scheduling and Placement

• k taint nodes <node> key=value:NoSchedule
• k taint nodes <node> key=value:NoSchedule-
• k label nodes <node> disktype=ssd
• k cordon <node>
• k drain <node> --ignore-daemonsets --delete-emptydir-data
• k uncordon <node>

Services and Networking

• k get svc -A
• k get svc <svc> -o yaml
• k describe svc <svc> -n <ns>
• k get endpoints -n <ns>
• k run tmp --rm -it --image=busybox:1.35 -- sh
• k run curl --rm -it --image=curlimages/curl -- sh

Storage

• k get pv
• k get pvc -A
• k describe pvc <pvc> -n <ns>
• k get sc

Troubleshooting

• k get events -A --sort-by=.lastTimestamp
• k describe <resource> <name> -n <ns>
• k auth can-i create pods --as system:serviceaccount:<ns>:<sa> -n <ns>
• k api-resources
• k api-versions
• k explain pod.spec.containers --recursive | less

JSONPath and Custom Output

• k get pods -A -o custom-columns=NS:.metadata.namespace,NAME:.metadata.name,NODE:.spec.nodeName
• k get nodes -o jsonpath='{.items[*].metadata.name}'
• k get pod <pod> -o jsonpath='{.status.podIP}'

Exam Speed Snippets

• k get po -A
• k get deploy,svc -A
• k -n <ns> get po
• k -n <ns> describe po <pod>
• k -n <ns> logs <pod>
• k -n <ns> edit deploy <dep>

Quick Reminder

• Prefer describe + events first when debugging.
• Use --dry-run=client -o yaml to generate manifests quickly.
• Confirm namespace/context before every task.