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cluster.go
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cluster.go
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package cluster
import (
"context"
"fmt"
"net"
"path/filepath"
"strings"
"github.com/rancher/rke/authz"
"github.com/rancher/rke/hosts"
"github.com/rancher/rke/log"
"github.com/rancher/rke/pki"
"github.com/rancher/rke/services"
"github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/sirupsen/logrus"
"gopkg.in/yaml.v2"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/cert"
)
type Cluster struct {
v3.RancherKubernetesEngineConfig `yaml:",inline"`
ConfigPath string
LocalKubeConfigPath string
EtcdHosts []*hosts.Host
WorkerHosts []*hosts.Host
ControlPlaneHosts []*hosts.Host
KubeClient *kubernetes.Clientset
KubernetesServiceIP net.IP
Certificates map[string]pki.CertificatePKI
ClusterDomain string
ClusterCIDR string
ClusterDNSServer string
DockerDialerFactory hosts.DialerFactory
LocalConnDialerFactory hosts.DialerFactory
}
const (
X509AuthenticationProvider = "x509"
StateConfigMapName = "cluster-state"
UpdateStateTimeout = 30
GetStateTimeout = 30
KubernetesClientTimeOut = 30
AplineImage = "alpine"
NginxProxyImage = "nginx_proxy"
CertDownloaderImage = "cert_downloader"
KubeDNSImage = "kubedns_image"
DNSMasqImage = "dnsmasq_image"
KubeDNSSidecarImage = "kubedns_sidecar_image"
KubeDNSAutoScalerImage = "kubedns_autoscaler_image"
ServiceSidekickImage = "service_sidekick_image"
NoneAuthorizationMode = "none"
)
func (c *Cluster) DeployControlPlane(ctx context.Context) error {
// Deploy Etcd Plane
if err := services.RunEtcdPlane(ctx, c.EtcdHosts, c.Services.Etcd, c.LocalConnDialerFactory); err != nil {
return fmt.Errorf("[etcd] Failed to bring up Etcd Plane: %v", err)
}
// Deploy Control plane
if err := services.RunControlPlane(ctx, c.ControlPlaneHosts,
c.EtcdHosts,
c.Services,
c.SystemImages[ServiceSidekickImage],
c.Authorization.Mode,
c.LocalConnDialerFactory); err != nil {
return fmt.Errorf("[controlPlane] Failed to bring up Control Plane: %v", err)
}
// Apply Authz configuration after deploying controlplane
if err := c.ApplyAuthzResources(ctx); err != nil {
return fmt.Errorf("[auths] Failed to apply RBAC resources: %v", err)
}
return nil
}
func (c *Cluster) DeployWorkerPlane(ctx context.Context) error {
// Deploy Worker Plane
if err := services.RunWorkerPlane(ctx, c.ControlPlaneHosts,
c.WorkerHosts,
c.Services,
c.SystemImages[NginxProxyImage],
c.SystemImages[ServiceSidekickImage],
c.LocalConnDialerFactory); err != nil {
return fmt.Errorf("[workerPlane] Failed to bring up Worker Plane: %v", err)
}
return nil
}
func ParseConfig(clusterFile string) (*v3.RancherKubernetesEngineConfig, error) {
logrus.Debugf("Parsing cluster file [%v]", clusterFile)
var rkeConfig v3.RancherKubernetesEngineConfig
if err := yaml.Unmarshal([]byte(clusterFile), &rkeConfig); err != nil {
return nil, err
}
return &rkeConfig, nil
}
func ParseCluster(ctx context.Context, rkeConfig *v3.RancherKubernetesEngineConfig, clusterFilePath string, dockerDialerFactory, localConnDialerFactory hosts.DialerFactory) (*Cluster, error) {
var err error
c := &Cluster{
RancherKubernetesEngineConfig: *rkeConfig,
ConfigPath: clusterFilePath,
DockerDialerFactory: dockerDialerFactory,
LocalConnDialerFactory: localConnDialerFactory,
}
// Setting cluster Defaults
c.setClusterDefaults(ctx)
if err := c.InvertIndexHosts(); err != nil {
return nil, fmt.Errorf("Failed to classify hosts from config file: %v", err)
}
if err := c.ValidateCluster(); err != nil {
return nil, fmt.Errorf("Failed to validate cluster: %v", err)
}
c.KubernetesServiceIP, err = services.GetKubernetesServiceIP(c.Services.KubeAPI.ServiceClusterIPRange)
if err != nil {
return nil, fmt.Errorf("Failed to get Kubernetes Service IP: %v", err)
}
c.ClusterDomain = c.Services.Kubelet.ClusterDomain
c.ClusterCIDR = c.Services.KubeController.ClusterCIDR
c.ClusterDNSServer = c.Services.Kubelet.ClusterDNSServer
if len(c.ConfigPath) == 0 {
c.ConfigPath = DefaultClusterConfig
}
c.LocalKubeConfigPath = GetLocalKubeConfig(c.ConfigPath)
return c, nil
}
func (c *Cluster) setClusterDefaults(ctx context.Context) {
if len(c.SSHKeyPath) == 0 {
c.SSHKeyPath = DefaultClusterSSHKeyPath
}
for i, host := range c.Nodes {
if len(host.InternalAddress) == 0 {
c.Nodes[i].InternalAddress = c.Nodes[i].Address
}
if len(host.HostnameOverride) == 0 {
// This is a temporary modification
c.Nodes[i].HostnameOverride = c.Nodes[i].Address
}
if len(host.SSHKeyPath) == 0 {
c.Nodes[i].SSHKeyPath = c.SSHKeyPath
}
}
if len(c.Authorization.Mode) == 0 {
c.Authorization.Mode = DefaultAuthorizationMode
}
if c.Services.KubeAPI.PodSecurityPolicy && c.Authorization.Mode != services.RBACAuthorizationMode {
log.Warnf(ctx, "PodSecurityPolicy can't be enabled with RBAC support disabled")
c.Services.KubeAPI.PodSecurityPolicy = false
}
c.setClusterServicesDefaults()
c.setClusterNetworkDefaults()
c.setClusterImageDefaults()
}
func (c *Cluster) setClusterServicesDefaults() {
serviceConfigDefaultsMap := map[*string]string{
&c.Services.KubeAPI.ServiceClusterIPRange: DefaultServiceClusterIPRange,
&c.Services.KubeController.ServiceClusterIPRange: DefaultServiceClusterIPRange,
&c.Services.KubeController.ClusterCIDR: DefaultClusterCIDR,
&c.Services.Kubelet.ClusterDNSServer: DefaultClusterDNSService,
&c.Services.Kubelet.ClusterDomain: DefaultClusterDomain,
&c.Services.Kubelet.InfraContainerImage: DefaultInfraContainerImage,
&c.Authentication.Strategy: DefaultAuthStrategy,
&c.Services.KubeAPI.Image: DefaultK8sImage,
&c.Services.Scheduler.Image: DefaultK8sImage,
&c.Services.KubeController.Image: DefaultK8sImage,
&c.Services.Kubelet.Image: DefaultK8sImage,
&c.Services.Kubeproxy.Image: DefaultK8sImage,
&c.Services.Etcd.Image: DefaultEtcdImage,
}
for k, v := range serviceConfigDefaultsMap {
setDefaultIfEmpty(k, v)
}
}
func (c *Cluster) setClusterImageDefaults() {
if c.SystemImages == nil {
// don't break if the user didn't define rke_images
c.SystemImages = make(map[string]string)
}
systemImagesDefaultsMap := map[string]string{
AplineImage: DefaultAplineImage,
NginxProxyImage: DefaultNginxProxyImage,
CertDownloaderImage: DefaultCertDownloaderImage,
KubeDNSImage: DefaultKubeDNSImage,
DNSMasqImage: DefaultDNSMasqImage,
KubeDNSSidecarImage: DefaultKubeDNSSidecarImage,
KubeDNSAutoScalerImage: DefaultKubeDNSAutoScalerImage,
ServiceSidekickImage: DefaultServiceSidekickImage,
}
for k, v := range systemImagesDefaultsMap {
setDefaultIfEmptyMapValue(c.SystemImages, k, v)
}
}
func GetLocalKubeConfig(configPath string) string {
baseDir := filepath.Dir(configPath)
fileName := filepath.Base(configPath)
baseDir += "/"
return fmt.Sprintf("%s%s%s", baseDir, pki.KubeAdminConfigPrefix, fileName)
}
func rebuildLocalAdminConfig(ctx context.Context, kubeCluster *Cluster) error {
log.Infof(ctx, "[reconcile] Rebuilding and updating local kube config")
var workingConfig, newConfig string
currentKubeConfig := kubeCluster.Certificates[pki.KubeAdminCommonName]
caCrt := kubeCluster.Certificates[pki.CACertName].Certificate
for _, cpHost := range kubeCluster.ControlPlaneHosts {
if (currentKubeConfig == pki.CertificatePKI{}) {
kubeCluster.Certificates = make(map[string]pki.CertificatePKI)
newConfig = getLocalAdminConfigWithNewAddress(kubeCluster.LocalKubeConfigPath, cpHost.Address)
} else {
kubeURL := fmt.Sprintf("https://%s:6443", cpHost.Address)
caData := string(cert.EncodeCertPEM(caCrt))
crtData := string(cert.EncodeCertPEM(currentKubeConfig.Certificate))
keyData := string(cert.EncodePrivateKeyPEM(currentKubeConfig.Key))
newConfig = pki.GetKubeConfigX509WithData(kubeURL, pki.KubeAdminCommonName, caData, crtData, keyData)
}
if err := pki.DeployAdminConfig(ctx, newConfig, kubeCluster.LocalKubeConfigPath); err != nil {
return fmt.Errorf("Failed to redeploy local admin config with new host")
}
workingConfig = newConfig
if _, err := GetK8sVersion(kubeCluster.LocalKubeConfigPath); err == nil {
log.Infof(ctx, "[reconcile] host [%s] is active master on the cluster", cpHost.Address)
break
}
}
currentKubeConfig.Config = workingConfig
kubeCluster.Certificates[pki.KubeAdminCommonName] = currentKubeConfig
return nil
}
func isLocalConfigWorking(ctx context.Context, localKubeConfigPath string) bool {
if _, err := GetK8sVersion(localKubeConfigPath); err != nil {
log.Infof(ctx, "[reconcile] Local config is not vaild, rebuilding admin config")
return false
}
return true
}
func getLocalConfigAddress(localConfigPath string) (string, error) {
config, err := clientcmd.BuildConfigFromFlags("", localConfigPath)
if err != nil {
return "", err
}
splittedAdress := strings.Split(config.Host, ":")
address := splittedAdress[1]
return address[2:], nil
}
func getLocalAdminConfigWithNewAddress(localConfigPath, cpAddress string) string {
config, _ := clientcmd.BuildConfigFromFlags("", localConfigPath)
config.Host = fmt.Sprintf("https://%s:6443", cpAddress)
return pki.GetKubeConfigX509WithData(
"https://"+cpAddress+":6443",
pki.KubeAdminCommonName,
string(config.CAData),
string(config.CertData),
string(config.KeyData))
}
func (c *Cluster) ApplyAuthzResources(ctx context.Context) error {
if err := authz.ApplyJobDeployerServiceAccount(ctx, c.LocalKubeConfigPath); err != nil {
return fmt.Errorf("Failed to apply the ServiceAccount needed for job execution: %v", err)
}
if c.Authorization.Mode == NoneAuthorizationMode {
return nil
}
if c.Authorization.Mode == services.RBACAuthorizationMode {
if err := authz.ApplySystemNodeClusterRoleBinding(ctx, c.LocalKubeConfigPath); err != nil {
return fmt.Errorf("Failed to apply the ClusterRoleBinding needed for node authorization: %v", err)
}
}
if c.Authorization.Mode == services.RBACAuthorizationMode && c.Services.KubeAPI.PodSecurityPolicy {
if err := authz.ApplyDefaultPodSecurityPolicy(ctx, c.LocalKubeConfigPath); err != nil {
return fmt.Errorf("Failed to apply default PodSecurityPolicy: %v", err)
}
if err := authz.ApplyDefaultPodSecurityPolicyRole(ctx, c.LocalKubeConfigPath); err != nil {
return fmt.Errorf("Failed to apply default PodSecurityPolicy ClusterRole and ClusterRoleBinding: %v", err)
}
}
return nil
}