package k8sapi import ( "context" "fmt" "io/fs" "github.com/icholy/replace" "golang.org/x/text/transform" ) const ( cniPluginsDir = "/opt/cni/bin" binDir = "/run/state/bin" kubeadmPath = "/run/state/bin/kubeadm" kubeletPath = "/run/state/bin/kubelet" kubectlPath = "/run/state/bin/kubectl" kubeletServiceEtcPath = "/etc/systemd/system/kubelet.service" kubeletServiceStatePath = "/run/state/systemd/system/kubelet.service" kubeadmConfEtcPath = "/etc/systemd/system/kubelet.service.d/10-kubeadm.conf" kubeadmConfStatePath = "/run/state/systemd/system/kubelet.service.d/10-kubeadm.conf" executablePerm = 0o544 systemdUnitPerm = 0o644 ) // versionConfigs holds download URLs for all required kubernetes components for every supported version. var versionConfigs map[string]kubernetesVersion = map[string]kubernetesVersion{ "1.23.6": { CNIPluginsURL: "https://github.com/containernetworking/plugins/releases/download/v1.1.1/cni-plugins-linux-amd64-v1.1.1.tgz", CrictlURL: "https://github.com/kubernetes-sigs/cri-tools/releases/download/v1.24.1/crictl-v1.24.1-linux-amd64.tar.gz", KubeletServiceURL: "https://raw.githubusercontent.com/kubernetes/release/v0.13.0/cmd/kubepkg/templates/latest/deb/kubelet/lib/systemd/system/kubelet.service", KubeadmConfURL: "https://raw.githubusercontent.com/kubernetes/release/v0.13.0/cmd/kubepkg/templates/latest/deb/kubeadm/10-kubeadm.conf", KubeletURL: "https://storage.googleapis.com/kubernetes-release/release/v1.23.6/bin/linux/amd64/kubelet", KubeadmURL: "https://storage.googleapis.com/kubernetes-release/release/v1.23.6/bin/linux/amd64/kubeadm", KubectlURL: "https://storage.googleapis.com/kubernetes-release/release/v1.23.6/bin/linux/amd64/kubectl", }, } type kubernetesVersion struct { CNIPluginsURL string CrictlURL string KubeletServiceURL string KubeadmConfURL string KubeletURL string KubeadmURL string KubectlURL string } // installK8sComponents installs kubernetes components for this version. // reference: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/#installing-kubeadm-kubelet-and-kubectl . func (k *kubernetesVersion) installK8sComponents(ctx context.Context, inst installer) error { if err := inst.Install( ctx, k.CNIPluginsURL, []string{cniPluginsDir}, executablePerm, true, ); err != nil { return fmt.Errorf("failed to install cni plugins: %w", err) } if err := inst.Install( ctx, k.CrictlURL, []string{binDir}, executablePerm, true, ); err != nil { return fmt.Errorf("failed to install crictl: %w", err) } if err := inst.Install( ctx, k.KubeletServiceURL, []string{kubeletServiceEtcPath, kubeletServiceStatePath}, systemdUnitPerm, false, replace.String("/usr/bin", binDir), ); err != nil { return fmt.Errorf("failed to install kubelet service: %w", err) } if err := inst.Install( ctx, k.KubeadmConfURL, []string{kubeadmConfEtcPath, kubeadmConfStatePath}, systemdUnitPerm, false, replace.String("/usr/bin", binDir), ); err != nil { return fmt.Errorf("failed to install kubeadm conf: %w", err) } if err := inst.Install( ctx, k.KubeletURL, []string{kubeletPath}, executablePerm, false, ); err != nil { return fmt.Errorf("failed to install kubelet: %w", err) } if err := inst.Install( ctx, k.KubeadmURL, []string{kubeadmPath}, executablePerm, false, ); err != nil { return fmt.Errorf("failed to install kubeadm: %w", err) } if err := inst.Install( ctx, k.KubectlURL, []string{kubectlPath}, executablePerm, false, ); err != nil { return fmt.Errorf("failed to install kubectl: %w", err) } return nil } type installer interface { Install( ctx context.Context, sourceURL string, destinations []string, perm fs.FileMode, extract bool, transforms ...transform.Transformer, ) error }