Kubenete study notes (POD)

Kubenete study notes (POD)

Pod Definition:

Create pod by definition: kubectl create -f [filename]Display pod definition: kubectl get po [pod name] -o yaml/jsonGetting log: kubectl logs [pod name] -c [container name]

Port forwarding: kubectl port-forward [pod name] [localport]:[pod port]Delete pod:kubectl delete po [pod name]kubectl delete po -l [label name=value]kubectl delete ns deletes all pods in a namespace kubectl delete po --all -n [namespace]

Spec/containers/image specify container image to use in pod Spec/containers/port is just for information:

Labels: App: which specifies which app, component, or microservice the pod belongs to. Rel: which shows whether the application running in the pod is a stable, beta, or a canary release.Attach label: kubectl label po [pod name] [label name=value] --overwritekubectl label node [node name] [label name=value] --overwrite Label selector: kubectl get po -l [label selector]Use label selector to schedule pod so that it satisfy different hardware requirementsSchedule pod to a set of nodes: Use nodeSelector in pod definition: Spec/nodeSelector/ Schedule pod to specific node: Set nodeSelector to kubernetes.io/hostname=xxx

Annotation: Used to introduce new features in kubenete

Namespace:Resource names only need to be unique within a namespace. Two different namespaces can contain resources of the same name. Can be used to implement multi-tenancyNamespace can be used to limit resource usage and access rightNode is not tied to namespace. kubectl create -f [yaml file name] namespace [xxx] to create pod that ties to a specific namespace

Pod failure can be recovered by kubelet while node failure needs to be recovered by replicationController

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