Pod (Kubernetes)

Kubernetes Pods are the smallest deployable units that allows to deploy one or multiple containers as a single atomic unit. Pods are defined using YAML files and applied with kubectl apply command.

Pod related commands

• kubectl apply
• kubectl create -f mypod.yml
• Get a list of pods:

kubectl get pods

• kubectl get pod MY_POD_NAME
• kubectl delete pod MY_POD_NAME
• kubectl top pod PODNAME
• Get more information about a pod:

kubectl describe pod MY_POD_NAME

• List all container by pod:

kubectl get pods -o jsonpath='{range .items[*]}{"pod: "}{.metadata.name}{"\n"}{range .spec.containers[*]}{"\tname: "}{.name}{"\n\timage: "}{.image}{"\n"}{end}'

See also ReplicaSet concept.

Activities

1. CKA v1.23-CKA v1.28: Understand connectivity between Pods
2. CKA v1.15: Create and configure a basic Pod: kubectl apply
3. Create a pod network: kubeadm init --pod-network-cidr=10.244.0.0/16
4. Mark a pod as critical: https://kubernetes.io/docs/tasks/administer-cluster/guaranteed-scheduling-critical-addon-pods/#marking-pod-as-critical

Related terms

• kind: Pod
• podman pod stats
• kubernetes.io/pod/volume/utilization
• List containers on a POD
• readinessProbe, livenessProbe
• kubectl exec --stdin --tty
• Kubernetes Container Lifecycle Events
• Kubernetes pod affinity and anti affinity‎‎
• Kubernetes, env:
• Pod Security: Kyverno
• SecurityContext
• Error creating: pods
• PodReadyToStartContainers

See also

• Pods: kubectl apply, kubectl [ pod get | top | delete | describe pods ], InitContainers, PodInitializing, CrashLoopBackOff, ImagePullPolicy:, NodeAffinity, NodeSelector, Terminated
• CKA: v1.28: API, Namespace, Pods, secrets, Services, deployments, nodes, Volumes, Ingress, CKS

https://kubernetes.io/docs/concepts/workloads/pods/pod/

https://en.wikipedia.org/wiki/Kubernetes#Pods

https://kubernetes.io/docs/concepts/workloads/controllers/replicaset/