pod-resources2.yaml in Operations Module appears to be invalid.

[amollenkopf]

Upon applying pod-resources2.yaml experiencing a 'pod is invalid' error:

cory6458:~/environment/aws-workshop-for-kubernetes/01-path-basics/103-kubernetes-concepts/templates (master) $ kubectl delete -f pod-resources1.yaml
pod "wildfly-pod" deleted
cory6458:~/environment/aws-workshop-for-kubernetes/01-path-basics/103-kubernetes-concepts/templates (master) $ kubectl apply -f pod-resources2.yaml
The Pod "wildfly-pod" is invalid: spec: Forbidden: pod updates may not change fields other than `spec.containers[*].image`, `spec.initContainers[*].image`, `spec.activeDeadlineSeconds` or `spec.tolerations` (only additions to existing tolerations)
{"Volumes":[{"Name":"default-token-f4znl","HostPath":null,"EmptyDir":null,"GCEPersistentDisk":null,"AWSElasticBlockStore":null,"GitRepo":null,"Secret":{"SecretName":"default-token-f4znl","Items":null,"DefaultMode":420,"Optional":null},"NFS":null,"ISCSI":null,"Glusterfs":null,"PersistentVolumeClaim":null,"RBD":null,"Quobyte":null,"FlexVolume":null,"Cinder":null,"CephFS":null,"Flocker":null,"DownwardAPI":null,"FC":null,"AzureFile":null,"ConfigMap":null,"VsphereVolume":null,"AzureDisk":null,"PhotonPersistentDisk":null,"Projected":null,"PortworxVolume":null,"ScaleIO":null,"StorageOS":null}],"InitContainers":null,"Containers":[{"Name":"wildfly","Image":"jboss/wildfly:11.0.0.Final","Command":null,"Args":null,"WorkingDir":"","Ports":[{"Name":"","HostPort":0,"ContainerPort":8080,"Protocol":"TCP","HostIP":""}],"EnvFrom":null,"Env":null,"Resources":{"Limits":{"cpu":"2","memory":"

A: 300Mi"},"Requests":{"cpu":"1","memory":"100Mi"}},"VolumeMounts":[{"Name":"default-token-f4znl","ReadOnly":true,"MountPath":"/var/run/secrets/kubernetes.io/serviceaccount","SubPath":"","MountPropagation":null}],"VolumeDevices":null,"LivenessProbe":null,"ReadinessProbe":null,"Lifecycle":null,"TerminationMessagePath":"/dev/termination-log","TerminationMessagePolicy":"File","ImagePullPolicy":"IfNotPresent","SecurityContext":null,"Stdin":false,"StdinOnce":false,"TTY":false}],"RestartPolicy":"Always","TerminationGracePeriodSeconds":30,"ActiveDeadlineSeconds":null,"DNSPolicy":"ClusterFirst","NodeSelector":null,"ServiceAccountName":"default","AutomountServiceAccountToken":null,"NodeName":"ip-172-20-43-105.us-east-2.compute.internal","SecurityContext":{"HostNetwork":false,"HostPID":false,"HostIPC":false,"SELinuxOptions":null,"RunAsUser":null,"RunAsNonRoot":null,"SupplementalGroups":null,"FSGroup":null},"ImagePullSecrets":null,"Hostname":"","Subdomain":"","Affinity":null,"SchedulerName":"default-scheduler","Tolerations":[{"Key":"node.kubernetes.io/not-ready","Operator":"Exists","Value":"","Effect":"NoExecute","TolerationSeconds":300},{"Key":"node.kubernetes.io/unreachable","Operator":"Exists","Value":"","Effect":"NoExecute","TolerationSeconds":300}],"HostAliases":null,"PriorityClassName":"","Priority":null,"DNSConfig":null}

B: 200Mi"},"Requests":{"cpu":"1","memory":"100Mi"}},"VolumeMounts":[{"Name":"default-token-f4znl","ReadOnly":true,"MountPath":"/var/run/secrets/kubernetes.io/serviceaccount","SubPath":"","MountPropagation":null}],"VolumeDevices":null,"LivenessProbe":null,"ReadinessProbe":null,"Lifecycle":null,"TerminationMessagePath":"/dev/termination-log","TerminationMessagePolicy":"File","ImagePullPolicy":"IfNotPresent","SecurityContext":null,"Stdin":false,"StdinOnce":false,"TTY":false}],"RestartPolicy":"Always","TerminationGracePeriodSeconds":30,"ActiveDeadlineSeconds":null,"DNSPolicy":"ClusterFirst","NodeSelector":null,"ServiceAccountName":"default","AutomountServiceAccountToken":null,"NodeName":"ip-172-20-43-105.us-east-2.compute.internal","SecurityContext":{"HostNetwork":false,"HostPID":false,"HostIPC":false,"SELinuxOptions":null,"RunAsUser":null,"RunAsNonRoot":null,"SupplementalGroups":null,"FSGroup":null},"ImagePullSecrets":null,"Hostname":"","Subdomain":"","Affinity":null,"SchedulerName":"default-scheduler","Tolerations":[{"Key":"node.kubernetes.io/not-ready","Operator":"Exists","Value":"","Effect":"NoExecute","TolerationSeconds":300},{"Key":"node.kubernetes.io/unreachable","Operator":"Exists","Value":"","Effect":"NoExecute","TolerationSeconds":300}],"HostAliases":null,"PriorityClassName":"","Priority":null,"DNSConfig":null}

[buzzsurfr]

This may be an eventual consistency issue. The pod in both pod-resources1.yaml and pod-resources2.yaml use the same name "wildfly-pod". The first wildfly-pod may have taken longer than anticipated to delete, causing the second wildfly-pod to instead try to update the first.

After running kubectl delete -f pod-resources1.yaml, you can ensure that the pod has been deleted with the following:

$ kubectl get pod/wildfly-pod
NAME          READY     STATUS        RESTARTS   AGE
wildfly-pod   1/1       Terminating   0          4m

In the above case, the pod is still terminating. Wait until the pod successfully terminates before running kubectl apply -f pod-resources2.yaml.