func setInitDynamicDefaults(cfg *kubeadmapi.MasterConfiguration) error {
// Auto-detect the IP
if len(cfg.API.AdvertiseAddresses) == 0 {
ip, err := netutil.ChooseHostInterface()
if err != nil {
return err
}
cfg.API.AdvertiseAddresses = []string{ip.String()}
}
// Validate version argument
ver, err := kubeadmutil.KubernetesReleaseVersion(cfg.KubernetesVersion)
if err != nil {
if cfg.KubernetesVersion != kubeadmapiext.DefaultKubernetesVersion {
return err
} else {
ver = kubeadmapiext.DefaultKubernetesFallbackVersion
}
}
cfg.KubernetesVersion = ver
fmt.Println("[init] Using Kubernetes version:", ver)
// Omit the "v" in the beginning, otherwise semver will fail
// If the version is newer than the specified version, RBAC v1beta1 support is enabled in the apiserver so we can default to RBAC
k8sVersion, err := semver.Parse(cfg.KubernetesVersion[1:])
if k8sVersion.GT(allowAllMaxVersion) {
cfg.AuthorizationMode = "RBAC"
}
fmt.Println("[init] Using Authorization mode:", cfg.AuthorizationMode)
// Warn about the limitations with the current cloudprovider solution.
if cfg.CloudProvider != "" {
fmt.Println("[init] WARNING: For cloudprovider integrations to work --cloud-provider must be set for all kubelets in the cluster.")
fmt.Println("\t(/etc/systemd/system/kubelet.service.d/10-kubeadm.conf should be edited for this purpose)")
}
// Validate token if any, otherwise generate
if cfg.Discovery.Token != nil {
if cfg.Discovery.Token.ID != "" && cfg.Discovery.Token.Secret != "" {
fmt.Printf("[init] A token has been provided, validating [%s]\n", kubeadmutil.BearerToken(cfg.Discovery.Token))
if valid, err := kubeadmutil.ValidateToken(cfg.Discovery.Token); valid == false {
return err
}
} else {
fmt.Println("[init] A token has not been provided, generating one")
if err := kubeadmutil.GenerateToken(cfg.Discovery.Token); err != nil {
return err
}
}
// If there aren't any addresses specified, default to the first advertised address which can be user-provided or the default network interface's IP address
if len(cfg.Discovery.Token.Addresses) == 0 {
cfg.Discovery.Token.Addresses = []string{cfg.API.AdvertiseAddresses[0] + ":" + strconv.Itoa(kubeadmapiext.DefaultDiscoveryBindPort)}
}
}
return nil
}
// runTokenDiscovery executes token-based discovery.
func runTokenDiscovery(td *kubeadmapi.TokenDiscovery) (*clientcmdapi.Config, error) {
if valid, err := kubeadmutil.ValidateToken(td); valid == false {
return nil, err
}
clusterInfo, err := kubenode.RetrieveTrustedClusterInfo(td)
if err != nil {
return nil, err
}
cfg, err := kubenode.EstablishMasterConnection(td, clusterInfo)
if err != nil {
return nil, err
}
return cfg, nil
}
