/*
Copyright 2021 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

// +k8s:defaulter-gen=TypeMeta
// +groupName=kubeadm.k8s.io
// +k8s:deepcopy-gen=package
// +k8s:conversion-gen=k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm

// Package v1beta3 defines the v1beta3 version of the kubeadm configuration file format.
// This version improves on the v1beta2 format by fixing some minor issues and adding a few new fields.
//
// A list of changes since v1beta2:
//	- The deprecated "ClusterConfiguration.useHyperKubeImage" field has been removed.
//	Kubeadm no longer supports the hyperkube image.
//	- The "ClusterConfiguration.DNS.Type" field has been removed since CoreDNS is the only supported
//	DNS server type by kubeadm.
//	- Include "datapolicy" tags on the fields that hold secrets.
//	This would result in the field values to be omitted when API structures are printed with klog.
//	- Add "InitConfiguration.SkipPhases", "JoinConfiguration.SkipPhases" to allow skipping
//	a list of phases during kubeadm init/join command execution.
//	- Add "InitConfiguration.NodeRegistration.ImagePullPolicy" and "JoinConfiguration.NodeRegistration.ImagePullPolicy"
//	to allow specifying the images pull policy during kubeadm "init" and "join". The value must be one of "Always", "Never" or
//	"IfNotPresent". "IfNotPresent" is the default, which has been the existing behavior prior to this addition.
//	- Add "InitConfiguration.Patches.Directory", "JoinConfiguration.Patches.Directory" to allow
//	the user to configure a directory from which to take patches for components deployed by kubeadm.
//	- Move the BootstrapToken* API and related utilities out of the "kubeadm" API group to a new group
//	"bootstraptoken". The kubeadm API version v1beta3 no longer contains the BootstrapToken* structures.
//
// Migration from old kubeadm config versions
//
//	- kubeadm v1.15.x and newer can be used to migrate from v1beta1 to v1beta2.
//	- kubeadm v1.22.x and newer no longer support v1beta1 and older APIs, but can be used to migrate v1beta2 to v1beta3.
//
// Basics
//
// The preferred way to configure kubeadm is to pass an YAML configuration file with the --config option. Some of the
// configuration options defined in the kubeadm config file are also available as command line flags, but only
// the most common/simple use case are supported with this approach.
//
// A kubeadm config file could contain multiple configuration types separated using three dashes (“---”).
//
// kubeadm supports the following configuration types:
//
//     apiVersion: kubeadm.k8s.io/v1beta3
//     kind: InitConfiguration
//
//     apiVersion: kubeadm.k8s.io/v1beta3
//     kind: ClusterConfiguration
//
//     apiVersion: kubelet.config.k8s.io/v1beta1
//     kind: KubeletConfiguration
//
//     apiVersion: kubeproxy.config.k8s.io/v1alpha1
//     kind: KubeProxyConfiguration
//
//     apiVersion: kubeadm.k8s.io/v1beta3
//     kind: JoinConfiguration
//
// To print the defaults for "init" and "join" actions use the following commands:
//  kubeadm config print init-defaults
//  kubeadm config print join-defaults
//
// The list of configuration types that must be included in a configuration file depends by the action you are
// performing (init or join) and by the configuration options you are going to use (defaults or advanced customization).
//
// If some configuration types are not provided, or provided only partially, kubeadm will use default values; defaults
// provided by kubeadm includes also enforcing consistency of values across components when required (e.g.
// cluster-cidr flag on controller manager and clusterCIDR on kube-proxy).
//
// Users are always allowed to override default values, with the only exception of a small subset of setting with
// relevance for security (e.g. enforce authorization-mode Node and RBAC on api server)
//
// If the user provides a configuration types that is not expected for the action you are performing, kubeadm will
// ignore those types and print a warning.
//
// Kubeadm init configuration types
//
// When executing kubeadm init with the --config option, the following configuration types could be used:
// InitConfiguration, ClusterConfiguration, KubeProxyConfiguration, KubeletConfiguration, but only one
// between InitConfiguration and ClusterConfiguration is mandatory.
//
//     apiVersion: kubeadm.k8s.io/v1beta3
//     kind: InitConfiguration
//     bootstrapTokens:
//         ...
//     nodeRegistration:
//         ...
//
// The InitConfiguration type should be used to configure runtime settings, that in case of kubeadm init
// are the configuration of the bootstrap token and all the setting which are specific to the node where kubeadm
// is executed, including:
//
// - NodeRegistration, that holds fields that relate to registering the new node to the cluster;
// use it to customize the node name, the CRI socket to use or any other settings that should apply to this
// node only (e.g. the node ip).
//
// - LocalAPIEndpoint, that represents the endpoint of the instance of the API server to be deployed on this node;
// use it e.g. to customize the API server advertise address.
//
//     apiVersion: kubeadm.k8s.io/v1beta3
//     kind: ClusterConfiguration
//     networking:
//         ...
//     etcd:
//         ...
//     apiServer:
//       extraArgs:
//         ...
//       extraVolumes:
//         ...
//     ...
//
// The ClusterConfiguration type should be used to configure cluster-wide settings,
// including settings for:
//
// - Networking, that holds configuration for the networking topology of the cluster; use it e.g. to customize
// pod subnet or services subnet.
//
// - Etcd configurations; use it e.g. to customize the local etcd or to configure the API server
// for using an external etcd cluster.
//
// - kube-apiserver, kube-scheduler, kube-controller-manager configurations; use it to customize control-plane
// components by adding customized setting or overriding kubeadm default settings.
//
//    apiVersion: kubeproxy.config.k8s.io/v1alpha1
//    kind: KubeProxyConfiguration
//       ...
//
// The KubeProxyConfiguration type should be used to change the configuration passed to kube-proxy instances deployed
// in the cluster. If this object is not provided or provided only partially, kubeadm applies defaults.
//
// See https://kubernetes.io/docs/reference/command-line-tools-reference/kube-proxy/ or https://godoc.org/k8s.io/kube-proxy/config/v1alpha1#KubeProxyConfiguration
// for kube proxy official documentation.
//
//    apiVersion: kubelet.config.k8s.io/v1beta1
//    kind: KubeletConfiguration
//       ...
//
// The KubeletConfiguration type should be used to change the configurations that will be passed to all kubelet instances
// deployed in the cluster. If this object is not provided or provided only partially, kubeadm applies defaults.
//
// See https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/ or https://godoc.org/k8s.io/kubelet/config/v1beta1#KubeletConfiguration
// for kubelet official documentation.
//
// Here is a fully populated example of a single YAML file containing multiple
// configuration types to be used during a `kubeadm init` run.
//
// 	apiVersion: kubeadm.k8s.io/v1beta3
// 	kind: InitConfiguration
// 	bootstrapTokens:
// 	- token: "9a08jv.c0izixklcxtmnze7"
// 	  description: "kubeadm bootstrap token"
// 	  ttl: "24h"
// 	- token: "783bde.3f89s0fje9f38fhf"
// 	  description: "another bootstrap token"
// 	  usages:
// 	  - authentication
// 	  - signing
// 	  groups:
// 	  - system:bootstrappers:kubeadm:default-node-token
// 	nodeRegistration:
// 	  name: "ec2-10-100-0-1"
// 	  criSocket: "/var/run/dockershim.sock"
// 	  taints:
// 	  - key: "kubeadmNode"
// 	    value: "master"
// 	    effect: "NoSchedule"
// 	  kubeletExtraArgs:
// 	    v: 4
//	  ignorePreflightErrors:
//	  - IsPrivilegedUser
//    imagePullPolicy: "IfNotPresent"
// 	localAPIEndpoint:
// 	  advertiseAddress: "10.100.0.1"
// 	  bindPort: 6443
//	certificateKey: "e6a2eb8581237ab72a4f494f30285ec12a9694d750b9785706a83bfcbbbd2204"
//  skipPhases:
//  - addon/kube-proxy
// 	---
// 	apiVersion: kubeadm.k8s.io/v1beta3
// 	kind: ClusterConfiguration
// 	etcd:
// 	  # one of local or external
// 	  local:
// 	    imageRepository: "k8s.gcr.io"
// 	    imageTag: "3.2.24"
// 	    dataDir: "/var/lib/etcd"
// 	    extraArgs:
// 	      listen-client-urls: "http://10.100.0.1:2379"
// 	    serverCertSANs:
// 	    -  "ec2-10-100-0-1.compute-1.amazonaws.com"
// 	    peerCertSANs:
// 	    - "10.100.0.1"
// 	  # external:
// 	    # endpoints:
// 	    # - "10.100.0.1:2379"
// 	    # - "10.100.0.2:2379"
// 	    # caFile: "/etcd/kubernetes/pki/etcd/etcd-ca.crt"
// 	    # certFile: "/etcd/kubernetes/pki/etcd/etcd.crt"
// 	    # keyFile: "/etcd/kubernetes/pki/etcd/etcd.key"
// 	networking:
// 	  serviceSubnet: "10.96.0.0/16"
// 	  podSubnet: "10.244.0.0/24"
// 	  dnsDomain: "cluster.local"
// 	kubernetesVersion: "v1.21.0"
// 	controlPlaneEndpoint: "10.100.0.1:6443"
// 	apiServer:
// 	  extraArgs:
// 	    authorization-mode: "Node,RBAC"
// 	  extraVolumes:
// 	  - name: "some-volume"
// 	    hostPath: "/etc/some-path"
// 	    mountPath: "/etc/some-pod-path"
// 	    readOnly: false
// 	    pathType: File
// 	  certSANs:
// 	  - "10.100.1.1"
// 	  - "ec2-10-100-0-1.compute-1.amazonaws.com"
// 	  timeoutForControlPlane: 4m0s
// 	controllerManager:
// 	  extraArgs:
// 	    "node-cidr-mask-size": "20"
// 	  extraVolumes:
// 	  - name: "some-volume"
// 	    hostPath: "/etc/some-path"
// 	    mountPath: "/etc/some-pod-path"
// 	    readOnly: false
// 	    pathType: File
// 	scheduler:
// 	  extraArgs:
// 	    address: "10.100.0.1"
// 	  extraVolumes:
// 	  - name: "some-volume"
// 	    hostPath: "/etc/some-path"
// 	    mountPath: "/etc/some-pod-path"
// 	    readOnly: false
// 	    pathType: File
// 	certificatesDir: "/etc/kubernetes/pki"
// 	imageRepository: "k8s.gcr.io"
// 	clusterName: "example-cluster"
// 	---
// 	apiVersion: kubelet.config.k8s.io/v1beta1
// 	kind: KubeletConfiguration
// 	# kubelet specific options here
// 	---
// 	apiVersion: kubeproxy.config.k8s.io/v1alpha1
// 	kind: KubeProxyConfiguration
// 	# kube-proxy specific options here
//
// Kubeadm join configuration types
//
// When executing kubeadm join with the --config option, the JoinConfiguration type should be provided.
//
//    apiVersion: kubeadm.k8s.io/v1beta3
//    kind: JoinConfiguration
//       ...
//
// The JoinConfiguration type should be used to configure runtime settings, that in case of kubeadm join
// are the discovery method used for accessing the cluster info and all the setting which are specific
// to the node where kubeadm is executed, including:
//
// - NodeRegistration, that holds fields that relate to registering the new node to the cluster;
// use it to customize the node name, the CRI socket to use or any other settings that should apply to this
// node only (e.g. the node ip).
//
// - APIEndpoint, that represents the endpoint of the instance of the API server to be eventually deployed on this node.
//
package v1beta3 // import "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta3"

//TODO: The BootstrapTokenString object should move out to either k8s.io/client-go or k8s.io/api in the future
//(probably as part of Bootstrap Tokens going GA). It should not be staged under the kubeadm API as it is now.
