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apiserver.go
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apiserver.go
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package recovery
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"regexp"
"text/template"
"time"
"github.com/ghodss/yaml"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apiserver/pkg/authentication/user"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
clientcmdapiv1 "k8s.io/client-go/tools/clientcmd/api/v1"
"k8s.io/klog"
"github.com/openshift/library-go/pkg/crypto"
"github.com/openshift/cluster-kube-apiserver-operator/pkg/operator/v410_00_assets"
)
const (
KubeApiserverStaticPodFileName = "kube-apiserver-pod.yaml"
RecoveryPodFileName = "recovery-kube-apiserver-pod.yaml"
RecoveryCofigFileName = "config.yaml"
RecoveryEncryptionCofigFileName = "encryption-config"
AdminKubeconfigFileName = "admin.kubeconfig"
RecoveryPodAsset = "v4.1.0/kube-apiserver/recovery-pod.yaml"
RecoveryConfigAsset = "v4.1.0/kube-apiserver/recovery-config.yaml"
RecoveryEncryptionConfigAsset = "v4.1.0/kube-apiserver/recovery-encryption-config.yaml"
)
type Apiserver struct {
PodManifestDir string
ResourceDirPath string
StaticPodResourcesDir string
recoveryResourcesDir string
kubeApiserverStaticPod *corev1.Pod
restConfig *rest.Config
kubeClientSet *kubernetes.Clientset
}
func (s *Apiserver) GetRecoveryResourcesDir() string {
return s.recoveryResourcesDir
}
func (s *Apiserver) GetKubeApiserverStaticPod() *corev1.Pod {
return s.kubeApiserverStaticPod
}
func (s *Apiserver) KubeApiserverManifestPath() string {
return filepath.Join(s.PodManifestDir, KubeApiserverStaticPodFileName)
}
func (s *Apiserver) RestConfig() (*rest.Config, error) {
if s.restConfig == nil {
return nil, errors.New("no rest config is set yet")
}
return s.restConfig, nil
}
func (s *Apiserver) KubeConfig() (*clientcmdapiv1.Config, error) {
restConfig, err := s.RestConfig()
if err != nil {
return nil, err
}
return &clientcmdapiv1.Config{
APIVersion: "v1",
Clusters: []clientcmdapiv1.NamedCluster{
{
Name: "recovery",
Cluster: clientcmdapiv1.Cluster{
CertificateAuthority: restConfig.CAFile,
Server: restConfig.Host,
},
},
},
Contexts: []clientcmdapiv1.NamedContext{
{
Name: "admin",
Context: clientcmdapiv1.Context{
Cluster: "recovery",
AuthInfo: "admin",
},
},
},
CurrentContext: "admin",
AuthInfos: []clientcmdapiv1.NamedAuthInfo{
{
Name: "admin",
AuthInfo: clientcmdapiv1.AuthInfo{
ClientCertificateData: restConfig.CertData,
ClientKeyData: restConfig.KeyData,
},
},
},
}, nil
}
func (s *Apiserver) GetKubeClientset() (*kubernetes.Clientset, error) {
if s.kubeClientSet != nil {
return s.kubeClientSet, nil
}
restConfig, err := s.RestConfig()
if err != nil {
return nil, err
}
kubeClientset, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return nil, fmt.Errorf("failed to build kubernetes clientset: %v", err)
}
s.kubeClientSet = kubeClientset
return s.kubeClientSet, nil
}
func (s *Apiserver) recoveryPod() (*corev1.Pod, error) {
// Create the manifest to run recovery apiserver
recoveryPodTemplateBytes, err := v410_00_assets.Asset(RecoveryPodAsset)
if err != nil {
return nil, fmt.Errorf("failed to find internal recovery pod asset %q: %v", RecoveryPodAsset, err)
}
// Process the template
t, err := template.New("recovery-pod-template").Parse(string(recoveryPodTemplateBytes))
if err != nil {
return nil, fmt.Errorf("fail to parse internal recovery pod template %q: %v", RecoveryPodAsset, err)
}
var kubeApiserverImage string
for _, container := range s.kubeApiserverStaticPod.Spec.Containers {
if regexp.MustCompile("^kube-apiserver-[a-zA-Z0-9]+$").MatchString(container.Name) || container.Name == "kube-apiserver" {
kubeApiserverImage = container.Image
}
}
if len(kubeApiserverImage) == 0 {
return nil, errors.New("failed to find kube-apiserver image")
}
recoveryPodBuffer := bytes.NewBuffer(nil)
err = t.Execute(recoveryPodBuffer, struct {
KubeApiserverImage string
ResourceDir string
}{
KubeApiserverImage: kubeApiserverImage,
ResourceDir: s.recoveryResourcesDir,
})
if err != nil {
return nil, fmt.Errorf("fail to execute internal recovery pod template %q: %v", RecoveryPodAsset, err)
}
recoveryPodObj, err := runtime.Decode(Codecs.UniversalDecoder(corev1.SchemeGroupVersion), recoveryPodBuffer.Bytes())
if err != nil {
return nil, fmt.Errorf("failed to decode internal recovery pod %q: %v", RecoveryPodAsset, err)
}
recoveryPod, ok := recoveryPodObj.(*corev1.Pod)
if !ok {
return nil, fmt.Errorf("unsupported type: internal recovery pod is not type *corev1.Pod but %T", recoveryPod)
}
return recoveryPod, nil
}
func (s *Apiserver) Create() error {
kubeApiserverManifestPath := s.KubeApiserverManifestPath()
var err error
s.kubeApiserverStaticPod, err = ReadManifestToV1Pod(kubeApiserverManifestPath)
if err != nil {
return fmt.Errorf("failed to read kube-apiserver pod manifest at %q: %v", kubeApiserverManifestPath, err)
}
s.ResourceDirPath, err = GetVolumeHostPathPath("resource-dir", s.kubeApiserverStaticPod.Spec.Volumes)
if err != nil {
return fmt.Errorf("failed to find resource-dir: %v", err)
}
s.recoveryResourcesDir = filepath.Join(s.StaticPodResourcesDir, "recovery-kube-apiserver-pod")
err = os.Mkdir(s.recoveryResourcesDir, 755)
if err != nil {
if os.IsExist(err) {
klog.Errorf("Recovery dir %q already exist. Please use `recovery-apiserver destroy` command or remove the dir manually.", s.recoveryResourcesDir)
}
return fmt.Errorf("failed to create recovery dir %q: %v", s.recoveryResourcesDir, err)
}
// Copy certs for accessing etcd
for src, dest := range map[string]string{
"secrets/etcd-client/tls.key": "etcd-client.key",
"secrets/etcd-client/tls.crt": "etcd-client.crt",
"configmaps/etcd-serving-ca/ca-bundle.crt": "etcd-serving-ca-bundle.crt",
} {
err = copyFile(filepath.Join(s.ResourceDirPath, src), filepath.Join(s.recoveryResourcesDir, dest))
if err != nil {
return err
}
}
// We are creating only temporary certificates to start the recovery apiserver.
// A week seem reasonably high for a debug session, while it is easy to create a new one.
certValidity := 7 * 24 * time.Hour
klog.Infof("Recovery apiserver certificates will be valid for %v", certValidity)
// Create root CA
rootCaConfig, err := crypto.MakeSelfSignedCAConfigForDuration("localhost", certValidity)
if err != nil {
return fmt.Errorf("failed to create root-signer CA: %v", err)
}
servingCaCertPath := filepath.Join(s.recoveryResourcesDir, "serving-ca.crt")
err = rootCaConfig.WriteCertConfigFile(servingCaCertPath, filepath.Join(s.recoveryResourcesDir, "serving-ca.key"))
if err != nil {
return fmt.Errorf("failed to write root-signer files: %v", err)
}
// Create config for recovery apiserver
recoveryConfigBytes, err := v410_00_assets.Asset(RecoveryConfigAsset)
if err != nil {
return fmt.Errorf("fail to find internal recovery config asset %q: %v", RecoveryConfigAsset, err)
}
recoveryConfigPath := filepath.Join(s.recoveryResourcesDir, RecoveryCofigFileName)
err = ioutil.WriteFile(recoveryConfigPath, recoveryConfigBytes, 644)
if err != nil {
return fmt.Errorf("failed to write recovery config %q: %v", recoveryConfigPath, err)
}
// always create a default (empty) encryption config to simplify the deployment
// only copy the real one if it exists
encryptionConfigExists, err := fileExists(filepath.Join(s.ResourceDirPath, "secrets/encryption-config/encryption-config"))
if err != nil {
return fmt.Errorf("failed to check if encryption config exists: %v", err)
}
if encryptionConfigExists {
err = copyFile(filepath.Join(s.ResourceDirPath, "secrets/encryption-config/encryption-config"), filepath.Join(s.recoveryResourcesDir, RecoveryEncryptionCofigFileName))
if err != nil {
return err
}
} else {
recoveryEncryptionConfigBytes, err := v410_00_assets.Asset(RecoveryEncryptionConfigAsset)
if err != nil {
return fmt.Errorf("fail to find recovery encryption config asset %q: %v", RecoveryEncryptionConfigAsset, err)
}
recoveryEncryptionConfigPath := filepath.Join(s.recoveryResourcesDir, RecoveryEncryptionCofigFileName)
err = ioutil.WriteFile(recoveryEncryptionConfigPath, recoveryEncryptionConfigBytes, 644)
if err != nil {
return fmt.Errorf("failed to write recovery encryption config %q: %v", recoveryEncryptionConfigPath, err)
}
}
recoveryPod, err := s.recoveryPod()
if err != nil {
return fmt.Errorf("failed to create recovery pod: %v", err)
}
recoveryPodBytes, err := yaml.Marshal(recoveryPod)
if err != nil {
return fmt.Errorf("failed to marshal recovery pod: %v", err)
}
recoveryPodManifestPath := filepath.Join(s.PodManifestDir, RecoveryPodFileName)
err = ioutil.WriteFile(recoveryPodManifestPath, recoveryPodBytes, 644)
if err != nil {
return fmt.Errorf("failed to write recovery pod manifest %q: %v", recoveryPodManifestPath, err)
}
// Create client cert
ca := crypto.CA{
Config: rootCaConfig,
SerialGenerator: &crypto.RandomSerialGenerator{},
}
// Create client certificates for system:admin
// (Reuse the serving CA as client CA, this is fine for shortlived localhost recovery apiserver.)
clientCert, err := ca.MakeClientCertificateForDuration(
&user.DefaultInfo{
Name: "system:admin",
Groups: []string{
"system:masters",
},
},
certValidity,
)
if err != nil {
return fmt.Errorf("failed to create client certificate: %v", err)
}
clientCertBytes, clientKeyBytes, err := clientCert.GetPEMBytes()
s.restConfig = &rest.Config{
Host: "https://localhost:7443",
TLSClientConfig: rest.TLSClientConfig{
CAFile: servingCaCertPath,
CertData: clientCertBytes,
KeyData: clientKeyBytes,
},
}
kubeconfig, err := s.KubeConfig()
if err != nil {
return fmt.Errorf("failed to create kubeconfig: %v", err)
}
kubeconfigBytes, err := yaml.Marshal(kubeconfig)
if err != nil {
return fmt.Errorf("failed to marshal kubeconfig: %v", err)
}
kubeconfigPath := filepath.Join(s.recoveryResourcesDir, AdminKubeconfigFileName)
err = ioutil.WriteFile(kubeconfigPath, kubeconfigBytes, 600)
if err != nil {
return fmt.Errorf("failed to write kubeconfig %q: %v", kubeconfigPath, err)
}
return nil
}
func (s *Apiserver) Destroy() error {
recoveryPodManifestPath := filepath.Join(s.PodManifestDir, RecoveryPodFileName)
recoveryPod, err := ReadManifestToV1Pod(recoveryPodManifestPath)
if err != nil {
return fmt.Errorf("failed to decode file %q: %v", recoveryPodManifestPath, err)
}
resourceDirPath, err := GetVolumeHostPathPath("resource-dir", recoveryPod.Spec.Volumes)
if err != nil {
return fmt.Errorf("failed to find resource-dir volume for pod manifest %q: %v", recoveryPodManifestPath, err)
}
klog.Infof("Deleting resource-dir %q", resourceDirPath)
err = os.RemoveAll(resourceDirPath)
if err != nil {
return fmt.Errorf("failed to remove recovery pod manifest %q: %v", recoveryPodManifestPath, err)
}
klog.Infof("Deleting recovery pod manifest %q", recoveryPodManifestPath)
err = os.Remove(recoveryPodManifestPath)
if err != nil {
return fmt.Errorf("failed to remove recovery pod manifest %q: %v", recoveryPodManifestPath, err)
}
return nil
}
func copyFile(src, dest string) error {
srcFile, err := os.Open(src)
if err != nil {
return fmt.Errorf("failed to open file %q: %v", src, err)
}
defer srcFile.Close()
srcFileInfo, err := srcFile.Stat()
if err != nil {
return fmt.Errorf("failed to stat file %q: %v", src, err)
}
if srcFileInfo.IsDir() {
return fmt.Errorf("can't copy file %q because it is a directory", src)
}
destFile, err := os.OpenFile(dest, os.O_WRONLY|os.O_CREATE|os.O_EXCL, srcFileInfo.Mode().Perm())
if err != nil {
return fmt.Errorf("failed to open file %q: %v", dest, err)
}
defer destFile.Close()
_, err = io.Copy(destFile, srcFile)
if err != nil {
return fmt.Errorf("failed to copy file %q into %q: %v", src, dest, err)
}
return nil
}
func fileExists(path string) (bool, error) {
info, err := os.Stat(path)
if err == nil {
return !info.IsDir(), nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}