In addition to compiled-in admission plugins, admission plugins can be developed as extensions and run as webhooks configured at runtime. This page describes how to build, configure, use, and monitor admission webhooks. What are admission webhooks? Admission webhooks are HTTP callbacks that receive admission requests and do something with them. You can define two types of admission webhooks, validating admission webhook and mutating admission webhook. Mutating admission webhooks are invoked first, and can modify objects sent to the API server to enforce custom defaults.

Kubernetes certificate and trust bundle APIs enable automation of X.509 credential provisioning by providing a programmatic interface for clients of the Kubernetes API to request and obtain X.509 certificates from a Certificate Authority (CA). There is also experimental (alpha) support for distributing trust bundles. Certificate signing requests FEATURE STATE: Kubernetes v1.19 [stable] A CertificateSigningRequest (CSR) resource is used to request that a certificate be signed by a denoted signer, after which the request may be approved or denied before finally being signed.

Services Connecting Applications with Services Using Source IP Explore Termination Behavior for Pods And Their Endpoi...

This tutorial shows you how to run Apache Cassandra on Kubernetes. Cassandra, a database, needs persistent storage to provide data durability (application state). In this example, a custom Cassandra seed provider lets the database discover new Cassandra instances as they join the Cassandra cluster. StatefulSets make it easier to deploy stateful applications into your Kubernetes cluster. For more information on the features used in this tutorial, see StatefulSet. Note: Cassandra and Kubernetes both use the term node to mean a member of a cluster.

This section provides reference information for the Kubernetes API. The REST API is the fundamental fabric of Kubernetes. All operations and communications between components, and external user commands are REST API calls that the API Server handles. Consequently, everything in the Kubernetes platform is treated as an API object and has a corresponding entry in the API. The Kubernetes API reference lists the API for Kubernetes version v1.30. For general background information, read The Kubernetes API.

This tutorial shows you how to deploy a WordPress site and a MySQL database using Minikube. Both applications use PersistentVolumes and PersistentVolumeClaims to store data. A PersistentVolume (PV) is a piece of storage in the cluster that has been manually provisioned by an administrator, or dynamically provisioned by Kubernetes using a StorageClass. A PersistentVolumeClaim (PVC) is a request for storage by a user that can be fulfilled by a PV.

Synopsis Execute a command in a container. kubectl exec (POD | TYPE/NAME) [-c CONTAINER] [flags] -- COMMAND [args...] Examples # Get output from running the 'date' command from pod mypod, using the first container by default kubectl exec mypod -- date # Get output from running the 'date' command in ruby-container from pod mypod kubectl exec mypod -c ruby-container -- date # Switch to raw terminal mode; sends stdin to 'bash' in ruby-container from pod mypod # and sends stdout/stderr from 'bash' back to the client kubectl exec mypod -c ruby-container -i -t -- bash -il # List contents of /usr from the first container of pod mypod and sort by modification time # If the command you want to execute in the pod has any flags in common (e.

Synopsis Creates a proxy server or application-level gateway between localhost and the Kubernetes API server. It also allows serving static content over specified HTTP path. All incoming data enters through one port and gets forwarded to the remote Kubernetes API server port, except for the path matching the static content path. kubectl proxy [--port=PORT] [--www=static-dir] [--www-prefix=prefix] [--api-prefix=prefix] Examples # To proxy all of the Kubernetes API and nothing else kubectl proxy --api-prefix=/ # To proxy only part of the Kubernetes API and also some static files # You can get pods info with 'curl localhost:8001/api/v1/pods' kubectl proxy --www=/my/files --www-prefix=/static/ --api-prefix=/api/ # To proxy the entire Kubernetes API at a different root # You can get pods info with 'curl localhost:8001/custom/api/v1/pods' kubectl proxy --api-prefix=/custom/ # Run a proxy to the Kubernetes API server on port 8011, serving static content from .

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

Synopsis Display events. Prints a table of the most important information about events. You can request events for a namespace, for all namespace, or filtered to only those pertaining to a specified resource. kubectl events [(-o|--output=)json|yaml|name|go-template|go-template-file|template|templatefile|jsonpath|jsonpath-as-json|jsonpath-file] [--for TYPE/NAME] [--watch] [--types=Normal,Warning] Examples # List recent events in the default namespace kubectl events # List recent events in all namespaces kubectl events --all-namespaces # List recent events for the specified pod, then wait for more events and list them as they arrive kubectl events --for pod/web-pod-13je7 --watch # List recent events in YAML format kubectl events -oyaml # List recent only events of type 'Warning' or 'Normal' kubectl events --types=Warning,Normal Options -A, --all-namespaces If present, list the requested object(s) across all namespaces.