Admission

Aliens seeking to lawfully enter into the United States must establish their admissibility to the satisfaction of the CBP officer. This is done as part of the inspection process. The reasons that a traveler who is applying for admission into the United States could be inadmissible are found in INA 212(a).

Admission

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Separate applications are required for students seeking readmission to the university, for those looking to earn a second undergraduate degree (non-Nursing), and for those who wish to take classes as a non-degree seeking student.

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The admission controllers in Kubernetes 1.26 consist of thelist below, are compiled into thekube-apiserver binary, and may only be configured by the clusteradministrator. In that list, there are two special controllers:MutatingAdmissionWebhook and ValidatingAdmissionWebhook. These execute themutating and validating (respectively)admission control webhookswhich are configured in the API.

The admission control process proceeds in two phases. In the first phase,mutating admission controllers are run. In the second phase, validatingadmission controllers are run. Note again that some of the controllers areboth.

Finally, in addition to sometimes mutating the object in question, admissioncontrollers may sometimes have side effects, that is, mutate relatedresources as part of request processing. Incrementing quota usage is thecanonical example of why this is necessary. Any such side-effect needs acorresponding reclamation or reconciliation process, as a given admissioncontroller does not know for sure that a given request will pass all of theother admission controllers.

Several important features of Kubernetes require an admission controller to be enabled in orderto properly support the feature. As a result, a Kubernetes API server that is not properlyconfigured with the right set of admission controllers is an incomplete server and will notsupport all the features you expect.

The Kubernetes API server flag enable-admission-plugins takes a comma-delimited list of admission control plugins to invoke prior to modifying objects in the cluster.For example, the following command line enables the NamespaceLifecycle and the LimitRangeradmission control plugins:

This admission controller modifies every new Pod to force the image pull policy to Always. This is useful in amultitenant cluster so that users can be assured that their private images can only be used by thosewho have the credentials to pull them. Without this admission controller, once an image has been pulled to anode, any pod from any user can use it by knowing the image's name (assuming the Pod isscheduled onto the right node), without any authorization check against the image. When this admission controlleris enabled, images are always pulled prior to starting containers, which means valid credentials arerequired.

This admission controller observes requests to approve CertificateSigningRequest resources and performs additionalauthorization checks to ensure the approving user has permission to approve certificate requests with thespec.signerName requested on the CertificateSigningRequest resource.

This admission controller observes updates to the status.certificate field of CertificateSigningRequest resourcesand performs an additional authorization checks to ensure the signing user has permission to sign certificaterequests with the spec.signerName requested on the CertificateSigningRequest resource.

This admission controller observes creation of CertificateSigningRequest resources that have a spec.signerNameof kubernetes.io/kube-apiserver-client. It rejects any request that specifies a 'group' (or 'organization attribute')of system:masters.

This admission controller observes creation of Ingress objects that do not request any specificingress class and automatically adds a default ingress class to them. This way, users that do notrequest any special ingress class do not need to care about them at all and they will get thedefault one.

This admission controller does not do anything when no default ingress class is configured. When more than one ingressclass is marked as default, it rejects any creation of Ingress with an error and an administratormust revisit their IngressClass objects and mark only one as default (with the annotation"ingressclass.kubernetes.io/is-default-class"). This admission controller ignores any Ingressupdates; it acts only on creation.

This admission controller observes creation of PersistentVolumeClaim objects that do not request any specific storage classand automatically adds a default storage class to them.This way, users that do not request any special storage class do not need to care about them at all and theywill get the default one.

This admission controller does not do anything when no default storage class is configured. When more than one storageclass is marked as default, it rejects any creation of PersistentVolumeClaim with an error and an administratormust revisit their StorageClass objects and mark only one as default.This admission controller ignores any PersistentVolumeClaim updates; it acts only on creation.

This admission controller sets the default forgiveness toleration for pods to toleratethe taints notready:NoExecute and unreachable:NoExecute based on the k8s-apiserver input parametersdefault-not-ready-toleration-seconds and default-unreachable-toleration-seconds if the pods don't alreadyhave toleration for taints node.kubernetes.io/not-ready:NoExecute ornode.kubernetes.io/unreachable:NoExecute.The default value for default-not-ready-toleration-seconds and default-unreachable-toleration-seconds is 5 minutes.

This admission controller rejects all net-new usage of the Service field externalIPs. Thisfeature is very powerful (allows network traffic interception) and not wellcontrolled by policy. When enabled, users of the cluster may not create newServices which use externalIPs and may not add new values to externalIPs onexisting Service objects. Existing uses of externalIPs are not affected,and users may remove values from externalIPs on existing Service objects.

This plug-in facilitates creation of dedicated nodes with extended resources.If operators want to create dedicated nodes with extended resources (like GPUs, FPGAs etc.), they are expected totaint the node with the extended resourcename as the key. This admission controller, if enabled, automaticallyadds tolerations for such taints to pods requesting extended resources, so users don't have to manuallyadd these tolerations.

When faced with an admission decision, the API Server POSTs a JSON serializedimagepolicy.k8s.io/v1alpha1 ImageReview object describing the action.This object contains fields describing the containers being admitted, as well asany pod annotations that match *.image-policy.k8s.io/*.

This admission controller will observe the incoming request and ensure that it does not violateany of the constraints enumerated in the LimitRange object in a Namespace. If you are usingLimitRange objects in your Kubernetes deployment, you MUST use this admission controller toenforce those constraints. LimitRanger can also be used to apply default resource requests to Podsthat don't specify any; currently, the default LimitRanger applies a 0.1 CPU requirement to allPods in the default namespace.

If a webhook called by this has side effects (for example, decrementing quota) itmust have a reconciliation system, as it is not guaranteed that subsequentwebhooks or validating admission controllers will permit the request to finish.

If you disable the MutatingAdmissionWebhook, you must also disable theMutatingWebhookConfiguration object in the admissionregistration.k8s.io/v1group/version via the --runtime-config flag, both are on by default.

This admission controller examines all incoming requests on namespaced resources and checksif the referenced namespace does exist.It creates a namespace if it cannot be found.This admission controller is useful in deployments that do not want to restrict creation ofa namespace prior to its usage.

This admission controller enforces that a Namespace that is undergoing termination cannot havenew objects created in it, and ensures that requests in a non-existent Namespace are rejected.This admission controller also prevents deletion of three system reserved namespaces default,kube-system, kube-public.

A Namespace deletion kicks off a sequence of operations that remove all objects (pods, services,etc.) in that namespace. In order to enforce integrity of that process, we strongly recommendrunning this admission controller.

This admission controller limits the Node and Pod objects a kubelet can modify. In order to be limited by this admission controller,kubelets must use credentials in the system:nodes group, with a username in the form system:node:.Such kubelets will only be allowed to modify their own Node API object, and only modify Pod API objects that are bound to their node.kubelets are not allowed to update or remove taints from their Node API object.

This admission controller protects the access to the metadata.ownerReferences of an objectso that only users with delete permission to the object can change it.This admission controller also protects the access to metadata.ownerReferences[x].blockOwnerDeletionof an object, so that only users with update permission to the finalizerssubresource of the referenced owner can change it. 041b061a72