Esempio n. 1
0
// PerformTLSBootstrap creates a RESTful client in order to execute certificate signing request.
func PerformTLSBootstrap(s *kubeadmapi.KubeadmConfig, apiEndpoint string, caCert []byte) (*clientcmdapi.Config, error) {
	// TODO(phase1+) try all the api servers until we find one that works
	bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", apiEndpoint, caCert)

	hostName, err := os.Hostname()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to get node hostname [%v]", err)
	}

	// TODO: hostname == nodename doesn't hold on all clouds (AWS).
	// But we don't have a cloudprovider, so we're stuck.
	glog.Errorf("assuming that hostname is the same as NodeName")
	nodeName := types.NodeName(hostName)

	bootstrapClientConfig, err := clientcmd.NewDefaultClientConfig(
		*kubeadmutil.MakeClientConfigWithToken(
			bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName), s.Secrets.BearerToken,
		),
		&clientcmd.ConfigOverrides{},
	).ClientConfig()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to create API client configuration [%v]", err)
	}

	client, err := unversionedcertificates.NewForConfig(bootstrapClientConfig)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to create API client [%v]", err)
	}
	csrClient := client.CertificateSigningRequests()

	// TODO(phase1+) checkCertsAPI() has a side-effect of making first attempt of communicating with the API,
	// we should _make it more explicit_ and have a user-settable _retry timeout_ to account for potential connectivity issues
	// (for example user may be bringing up machines in parallel and for some reasons master is slow to boot)

	if err := checkCertsAPI(bootstrapClientConfig); err != nil {
		return nil, fmt.Errorf("<node/csr> failed to proceed due to API compatibility issue - %v", err)
	}

	fmt.Println("<node/csr> created API client to obtain unique certificate for this node, generating keys and certificate signing request")

	key, err := certutil.MakeEllipticPrivateKeyPEM()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to generating private key [%v]", err)
	}

	cert, err := csr.RequestNodeCertificate(csrClient, key, nodeName)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to request signed certificate from the API server [%v]", err)
	}

	// TODO(phase1+) print some basic info about the cert
	fmt.Println("<node/csr> received signed certificate from the API server, generating kubelet configuration")

	finalConfig := kubeadmutil.MakeClientConfigWithCerts(
		bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName),
		key, cert,
	)

	return finalConfig, nil
}
Esempio n. 2
0
// PerformTLSBootstrap creates a RESTful client in order to execute certificate signing request.
func PerformTLSBootstrap(s *kubeadmapi.NodeConfiguration, apiEndpoint string, caCert []byte) (*clientcmdapi.Config, error) {
	// TODO(phase1+) try all the api servers until we find one that works
	bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", apiEndpoint, caCert)

	hostName, err := os.Hostname()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to get node hostname [%v]", err)
	}

	// TODO(phase1+) https://github.com/kubernetes/kubernetes/issues/33641
	nodeName := types.NodeName(hostName)

	bootstrapClientConfig, err := clientcmd.NewDefaultClientConfig(
		*kubeadmutil.MakeClientConfigWithToken(
			bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName), s.Secrets.BearerToken,
		),
		&clientcmd.ConfigOverrides{},
	).ClientConfig()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to create API client configuration [%v]", err)
	}

	client, err := unversionedcertificates.NewForConfig(bootstrapClientConfig)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to create API client [%v]", err)
	}
	csrClient := client.CertificateSigningRequests()

	// TODO(phase1+) https://github.com/kubernetes/kubernetes/issues/33643

	if err := checkCertsAPI(bootstrapClientConfig); err != nil {
		return nil, fmt.Errorf("<node/csr> failed to proceed due to API compatibility issue - %v", err)
	}

	fmt.Println("<node/csr> created API client to obtain unique certificate for this node, generating keys and certificate signing request")

	key, err := certutil.MakeEllipticPrivateKeyPEM()
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to generating private key [%v]", err)
	}
	cert, err := csr.RequestNodeCertificate(csrClient, key, nodeName)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to request signed certificate from the API server [%v]", err)
	}
	fmtCert, err := certutil.FormatBytesCert(cert)
	if err != nil {
		return nil, fmt.Errorf("<node/csr> failed to format certificate [%v]", err)
	}
	fmt.Printf("<node/csr> received signed certificate from the API server:\n%s\n", fmtCert)
	fmt.Println("<node/csr> generating kubelet configuration")
	finalConfig := kubeadmutil.MakeClientConfigWithCerts(
		bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName),
		key, cert,
	)

	return finalConfig, nil
}
// creates a set of clients for this endpoint
func createClients(caCert []byte, endpoint, token string, nodeName types.NodeName) (*clientset.Clientset, error) {
	bareClientConfig := kubeadmutil.CreateBasicClientConfig("kubernetes", endpoint, caCert)
	bootstrapClientConfig, err := clientcmd.NewDefaultClientConfig(
		*kubeadmutil.MakeClientConfigWithToken(
			bareClientConfig, "kubernetes", fmt.Sprintf("kubelet-%s", nodeName), token,
		),
		&clientcmd.ConfigOverrides{},
	).ClientConfig()
	if err != nil {
		return nil, fmt.Errorf("failed to create API client configuration [%v]", err)
	}
	clientSet, err := clientset.NewForConfig(bootstrapClientConfig)
	if err != nil {
		return nil, fmt.Errorf("failed to create clients for the API endpoint %s [%v]", endpoint, err)
	}
	return clientSet, nil
}