Synopsis The Kubernetes controller manager is a daemon that embeds the core control loops shipped with Kubernetes. In applications of robotics and automation, a control loop is a non-terminating loop that regulates the state of the system. In Kubernetes, a controller is a control loop that watches the shared state of the cluster through the apiserver and makes changes attempting to move the current state towards the desired state. Examples of controllers that ship with Kubernetes today are the replication controller, endpoints controller, namespace controller, and serviceaccounts controller.

Synopsis Set the selector on a resource. Note that the new selector will overwrite the old selector if the resource had one prior to the invocation of 'set selector'. A selector must begin with a letter or number, and may contain letters, numbers, hyphens, dots, and underscores, up to 63 characters. If --resource-version is specified, then updates will use this resource version, otherwise the existing resource-version will be used. Note: currently selectors can only be set on Service objects.

Production-Grade Container Orchestration

Resource Types Event EventList Policy PolicyList Event Appears in: EventList Event captures all the information that can be included in an API audit log. FieldDescription apiVersionstringaudit.k8s.io/v1 kindstringEvent level [Required] Level AuditLevel at which event was generated auditID [Required] k8s.io/apimachinery/pkg/types.UID Unique audit ID, generated for each request. stage [Required] Stage Stage of the request handling when this event instance was generated. requestURI [Required] string RequestURI is the request URI as sent by the client to a server.

Package v1 is the v1 version of the API. Resource Types WebhookAdmission WebhookAdmission WebhookAdmission provides configuration for the webhook admission controller. FieldDescription apiVersionstringapiserver.config.k8s.io/v1 kindstringWebhookAdmission kubeConfigFile [Required] string KubeConfigFile is the path to the kubeconfig file.

Production-Grade Container Orchestration

This guide is for application owners who want to build highly available applications, and thus need to understand what types of disruptions can happen to Pods. It is also for cluster administrators who want to perform automated cluster actions, like upgrading and autoscaling clusters. Voluntary and involuntary disruptions Pods do not disappear until someone (a person or a controller) destroys them, or there is an unavoidable hardware or system software error.

If two Pods in your cluster want to communicate, and both Pods are actually running on the same node, use _Service Internal Traffic Policy_ to keep network traffic within that node. Avoiding a round trip via the cluster network can help with reliability, performance (network latency and throughput), or cost.

FEATURE STATE: Kubernetes v1.28 [alpha] (enabled by default: false) Kubernetes 1.34 includes an alpha feature that lets an API Server proxy a resource requests to other peer API servers. This is useful when there are multiple API servers running different versions of Kubernetes in one cluster (for example, during a long-lived rollout to a new release of Kubernetes). This enables cluster administrators to configure highly available clusters that can be upgraded more safely, by directing resource requests (made during the upgrade) to the correct kube-apiserver.

Windows applications constitute a large portion of the services and applications that run in many organizations. Windows containers provide a way to encapsulate processes and package dependencies, making it easier to use DevOps practices and follow cloud native patterns for Windows applications. Organizations with investments in Windows-based applications and Linux-based applications don't have to look for separate orchestrators to manage their workloads, leading to increased operational efficiencies across their deployments, regardless of operating system.