This page provides a step-by-step example of updating configuration within a Pod via a ConfigMap and builds upon the Configure a Pod to Use a ConfigMap task. At the end of this tutorial, you will understand how to change the configuration for a running application. This tutorial uses the alpine and nginx images as examples. Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster.

This page provides an example of how to provision and configure swap memory on a Kubernetes node using kubeadm. Objectives Provision swap memory on a Kubernetes node using kubeadm. Learn to configure both encrypted and unencrypted swap. Learn to enable swap on boot. Before you begin You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. It is recommended to run this tutorial on a cluster with at least two nodes that are not acting as control plane hosts.

Production-Grade Container Orchestration

Synopsis Reconciles rules for RBAC role, role binding, cluster role, and cluster role binding objects. Missing objects are created, and the containing namespace is created for namespaced objects, if required. Existing roles are updated to include the permissions in the input objects, and remove extra permissions if --remove-extra-permissions is specified. Existing bindings are updated to include the subjects in the input objects, and remove extra subjects if --remove-extra-subjects is specified.

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.

Performs a best effort revert of changes made by kubeadm init or kubeadm join. Synopsis Performs a best effort revert of changes made to this host by 'kubeadm init' or 'kubeadm join' The "reset" command executes the following phases: preflight Run reset pre-flight checks remove-etcd-member Remove a local etcd member. cleanup-node Run cleanup node. kubeadm reset [flags] Options --cert-dir string     Default: "/etc/kubernetes/pki" The path to the directory where the certificates are stored.

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.

Synopsis Create an ExternalName service with the specified name. ExternalName service references to an external DNS address instead of only pods, which will allow application authors to reference services that exist off platform, on other clusters, or locally. kubectl create service externalname NAME --external-name external.name [--dry-run=server|client|none] Examples # Create a new ExternalName service named my-ns kubectl create service externalname my-ns --external-name bar.com Options --allow-missing-template-keys     Default: true If true, ignore any errors in templates when a field or map key is missing in the template.

Synopsis Create a cron job with the specified name. kubectl create cronjob NAME --image=image --schedule='0/5 * * * ?' -- [COMMAND] [args...] [flags] Examples # Create a cron job kubectl create cronjob my-job --image=busybox --schedule="*/1 * * * *" # Create a cron job with a command kubectl create cronjob my-job --image=busybox --schedule="*/1 * * * *" -- date Options --allow-missing-template-keys     Default: true If true, ignore any errors in templates when a field or map key is missing in the template.

Synopsis Unset an individual value in a kubeconfig file. PROPERTY_NAME is a dot delimited name where each token represents either an attribute name or a map key. Map keys may not contain dots. kubectl config unset PROPERTY_NAME Examples # Unset the current-context kubectl config unset current-context # Unset namespace in foo context kubectl config unset contexts.foo.namespace Options -h, --help help for unset Parent Options Inherited --as string Username to impersonate for the operation.