1/* 2Copyright 2016 The Kubernetes Authors. 3 4Licensed under the Apache License, Version 2.0 (the "License"); 5you may not use this file except in compliance with the License. 6You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10Unless required by applicable law or agreed to in writing, software 11distributed under the License is distributed on an "AS IS" BASIS, 12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13See the License for the specific language governing permissions and 14limitations under the License. 15*/ 16 17package images 18 19import ( 20 "fmt" 21 22 kubeadmapi "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm" 23 kubeadmapiv1beta2 "k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2" 24 "k8s.io/kubernetes/cmd/kubeadm/app/constants" 25 kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util" 26 27 "k8s.io/klog/v2" 28) 29 30// GetGenericImage generates and returns a platform agnostic image (backed by manifest list) 31func GetGenericImage(prefix, image, tag string) string { 32 return fmt.Sprintf("%s/%s:%s", prefix, image, tag) 33} 34 35// GetKubernetesImage generates and returns the image for the components managed in the Kubernetes main repository, 36// including the control-plane components and kube-proxy. 37func GetKubernetesImage(image string, cfg *kubeadmapi.ClusterConfiguration) string { 38 repoPrefix := cfg.GetControlPlaneImageRepository() 39 kubernetesImageTag := kubeadmutil.KubernetesVersionToImageTag(cfg.KubernetesVersion) 40 return GetGenericImage(repoPrefix, image, kubernetesImageTag) 41} 42 43// GetDNSImage generates and returns the image for CoreDNS. 44func GetDNSImage(cfg *kubeadmapi.ClusterConfiguration) string { 45 // DNS uses default image repository by default 46 dnsImageRepository := cfg.ImageRepository 47 // unless an override is specified 48 if cfg.DNS.ImageRepository != "" { 49 dnsImageRepository = cfg.DNS.ImageRepository 50 } 51 // Handle the renaming of the official image from "k8s.gcr.io/coredns" to "k8s.gcr.io/coredns/coredns 52 if dnsImageRepository == kubeadmapiv1beta2.DefaultImageRepository { 53 dnsImageRepository = fmt.Sprintf("%s/coredns", dnsImageRepository) 54 } 55 // DNS uses an imageTag that corresponds to the DNS version matching the Kubernetes version 56 dnsImageTag := constants.CoreDNSVersion 57 58 // unless an override is specified 59 if cfg.DNS.ImageTag != "" { 60 dnsImageTag = cfg.DNS.ImageTag 61 } 62 return GetGenericImage(dnsImageRepository, constants.CoreDNSImageName, dnsImageTag) 63} 64 65// GetEtcdImage generates and returns the image for etcd 66func GetEtcdImage(cfg *kubeadmapi.ClusterConfiguration) string { 67 // Etcd uses default image repository by default 68 etcdImageRepository := cfg.ImageRepository 69 // unless an override is specified 70 if cfg.Etcd.Local != nil && cfg.Etcd.Local.ImageRepository != "" { 71 etcdImageRepository = cfg.Etcd.Local.ImageRepository 72 } 73 // Etcd uses an imageTag that corresponds to the etcd version matching the Kubernetes version 74 etcdImageTag := constants.DefaultEtcdVersion 75 etcdVersion, warning, err := constants.EtcdSupportedVersion(constants.SupportedEtcdVersion, cfg.KubernetesVersion) 76 if err == nil { 77 etcdImageTag = etcdVersion.String() 78 } 79 if warning != nil { 80 klog.Warningln(warning) 81 } 82 // unless an override is specified 83 if cfg.Etcd.Local != nil && cfg.Etcd.Local.ImageTag != "" { 84 etcdImageTag = cfg.Etcd.Local.ImageTag 85 } 86 return GetGenericImage(etcdImageRepository, constants.Etcd, etcdImageTag) 87} 88 89// GetControlPlaneImages returns a list of container images kubeadm expects to use on a control plane node 90func GetControlPlaneImages(cfg *kubeadmapi.ClusterConfiguration) []string { 91 imgs := []string{} 92 93 // start with core kubernetes images 94 imgs = append(imgs, GetKubernetesImage(constants.KubeAPIServer, cfg)) 95 imgs = append(imgs, GetKubernetesImage(constants.KubeControllerManager, cfg)) 96 imgs = append(imgs, GetKubernetesImage(constants.KubeScheduler, cfg)) 97 imgs = append(imgs, GetKubernetesImage(constants.KubeProxy, cfg)) 98 99 // pause is not available on the ci image repository so use the default image repository. 100 imgs = append(imgs, GetPauseImage(cfg)) 101 102 // if etcd is not external then add the image as it will be required 103 if cfg.Etcd.Local != nil { 104 imgs = append(imgs, GetEtcdImage(cfg)) 105 } 106 107 // Append the appropriate DNS images 108 imgs = append(imgs, GetDNSImage(cfg)) 109 110 return imgs 111} 112 113// GetPauseImage returns the image for the "pause" container 114func GetPauseImage(cfg *kubeadmapi.ClusterConfiguration) string { 115 return GetGenericImage(cfg.ImageRepository, "pause", constants.PauseVersion) 116} 117