During kubeadm init, kubeadm uploads the ClusterConfiguration object to your cluster in a ConfigMap called kubeadm-config in the kube-system namespace. This configuration is then read during kubeadm join, kubeadm reset and kubeadm upgrade. You can use kubeadm config print to print the default static configuration that kubeadm uses for kubeadm init and kubeadm join. Note:The output of the command is meant to serve as an example. You must manually edit the output of this command to adapt to your setup.

Mechanisms for accessing metrics at node, volume, pod and container level, as seen by the kubelet.

FEATURE STATE: Kubernetes v1.26 [alpha] (enabled by default: false) This page shows how to migrate nodes to use event based updates for container status. The event-based implementation reduces node resource consumption by the kubelet, compared to the legacy approach that relies on polling. You may know this feature as evented Pod lifecycle event generator (PLEG). That's the name used internally within the Kubernetes project for a key implementation detail.

Role-based access control (RBAC) is a method of regulating access to computer or network resources based on the roles of individual users within your organization. RBAC authorization uses the rbac.authorization.k8s.io API group to drive authorization decisions, allowing you to dynamically configure policies through the Kubernetes API. To enable RBAC, start the API server with the --authorization-config flag set to a file that includes the RBAC authorizer; for example: apiVersion: apiserver.

The Kubernetes model for connecting containers Now that you have a continuously running, replicated application you can expose it on a network. Kubernetes assumes that pods can communicate with other pods, regardless of which host they land on. Kubernetes gives every pod its own cluster-private IP address, so you do not need to explicitly create links between pods or map container ports to host ports. This means that containers within a Pod can all reach each other's ports on localhost, and all pods in a cluster can see each other without NAT.

Production-Grade Container Orchestration

Synopsis Create a cluster role. kubectl create clusterrole NAME --verb=verb --resource=resource.group [--resource-name=resourcename] [--dry-run=server|client|none] Examples # Create a cluster role named "pod-reader" that allows user to perform "get", "watch" and "list" on pods kubectl create clusterrole pod-reader --verb=get,list,watch --resource=pods # Create a cluster role named "pod-reader" with ResourceName specified kubectl create clusterrole pod-reader --verb=get --resource=pods --resource-name=readablepod --resource-name=anotherpod # Create a cluster role named "foo" with API Group specified kubectl create clusterrole foo --verb=get,list,watch --resource=rs.

Resource Types DefaultPreemptionArgs InterPodAffinityArgs KubeSchedulerConfiguration NodeAffinityArgs NodeResourcesBalancedAllocationArgs NodeResourcesFitArgs PodTopologySpreadArgs VolumeBindingArgs ClientConnectionConfiguration Appears in: KubeSchedulerConfiguration ClientConnectionConfiguration contains details for constructing a client. FieldDescription kubeconfig [Required] string kubeconfig is the path to a KubeConfig file. acceptContentTypes [Required] string acceptContentTypes defines the Accept header sent by clients when connecting to a server, overriding the default value of 'application/json'. This field will control all connections to the server used by a particular client. contentType [Required] string contentType is the content type used when sending data to the server from this client.

Resource Types Configuration Configuration Configuration provides configuration for the EventRateLimit admission controller. FieldDescription apiVersionstringeventratelimit.admission.k8s.io/v1alpha1 kindstringConfiguration limits [Required] []Limit limits are the limits to place on event queries received. Limits can be placed on events received server-wide, per namespace, per user, and per source+object. At least one limit is required. Limit Appears in: Configuration Limit is the configuration for a particular limit type FieldDescription type [Required] LimitType type is the type of limit to which this configuration applies

Production-Grade Container Orchestration