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provisioner.go
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provisioner.go
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package clusterprovisioner
import (
"fmt"
"reflect"
"sort"
"strings"
"time"
"github.com/mitchellh/mapstructure"
"github.com/rancher/kontainer-engine/drivers/rke"
"github.com/rancher/kontainer-engine/service"
"github.com/rancher/norman/controller"
"github.com/rancher/norman/event"
"github.com/rancher/norman/types/convert"
"github.com/rancher/norman/types/slice"
"github.com/rancher/rancher/pkg/configfield"
"github.com/rancher/rancher/pkg/ref"
"github.com/rancher/rancher/pkg/rkedialerfactory"
"github.com/rancher/rancher/pkg/settings"
"github.com/rancher/rke/services"
"github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/rancher/types/config"
"github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/util/flowcontrol"
)
const (
RKEDriverKey = "rancherKubernetesEngineConfig"
)
type Provisioner struct {
ClusterController v3.ClusterController
Clusters v3.ClusterInterface
NodeLister v3.NodeLister
Driver service.EngineService
EventLogger event.Logger
backoff *flowcontrol.Backoff
}
func Register(management *config.ManagementContext) {
p := &Provisioner{
Driver: service.NewEngineService(NewPersistentStore(management.Core.Namespaces(""), management.Core)),
Clusters: management.Management.Clusters(""),
ClusterController: management.Management.Clusters("").Controller(),
NodeLister: management.Management.Nodes("").Controller().Lister(),
EventLogger: management.EventLogger,
backoff: flowcontrol.NewBackOff(30*time.Second, 10*time.Minute),
}
// Add handlers
p.Clusters.AddLifecycle("cluster-provisioner-controller", p)
management.Management.Nodes("").AddHandler("cluster-provisioner-controller", p.machineChanged)
local := &rkedialerfactory.RKEDialerFactory{
Factory: management.Dialer,
}
docker := &rkedialerfactory.RKEDialerFactory{
Factory: management.Dialer,
Docker: true,
}
driver := service.Drivers["rke"]
rkeDriver := driver.(*rke.Driver)
rkeDriver.DockerDialer = docker.Build
rkeDriver.LocalDialer = local.Build
rkeDriver.WrapTransportFactory = docker.WrapTransport
}
func (p *Provisioner) Remove(cluster *v3.Cluster) (*v3.Cluster, error) {
logrus.Infof("Deleting cluster [%s]", cluster.Name)
if skipProvisioning(cluster) ||
cluster.Status.Driver == "" {
return nil, nil
}
for i := 0; i < 4; i++ {
err := p.driverRemove(cluster)
if err == nil {
break
}
if i == 3 {
return cluster, fmt.Errorf("failed to remove the cluster [%s]: %v", cluster.Name, err)
}
time.Sleep(1 * time.Second)
}
logrus.Infof("Deleted cluster [%s]", cluster.Name)
// cluster object will definitely have changed, reload
return p.Clusters.Get(cluster.Name, metav1.GetOptions{})
}
func (p *Provisioner) Updated(cluster *v3.Cluster) (*v3.Cluster, error) {
obj, err := v3.ClusterConditionUpdated.Do(cluster, func() (runtime.Object, error) {
setVersion(cluster)
return p.update(cluster, false)
})
return obj.(*v3.Cluster), err
}
func setVersion(cluster *v3.Cluster) {
if cluster.Spec.RancherKubernetesEngineConfig != nil {
if cluster.Spec.RancherKubernetesEngineConfig.Version == "" {
//set version from the applied spec
if cluster.Status.AppliedSpec.RancherKubernetesEngineConfig != nil {
if cluster.Status.AppliedSpec.RancherKubernetesEngineConfig.Version != "" {
cluster.Spec.RancherKubernetesEngineConfig.Version = cluster.Status.AppliedSpec.RancherKubernetesEngineConfig.Version
} else {
cluster.Spec.RancherKubernetesEngineConfig.Version = settings.KubernetesVersion.Get()
}
}
}
}
}
func (p *Provisioner) update(cluster *v3.Cluster, create bool) (*v3.Cluster, error) {
cluster, err := p.reconcileCluster(cluster, create)
if err != nil {
return cluster, err
}
v3.ClusterConditionProvisioned.True(cluster)
v3.ClusterConditionPending.True(cluster)
return cluster, nil
}
func (p *Provisioner) machineChanged(key string, machine *v3.Node) error {
parts := strings.SplitN(key, "/", 2)
p.ClusterController.Enqueue("", parts[0])
return nil
}
func (p *Provisioner) Create(cluster *v3.Cluster) (*v3.Cluster, error) {
var err error
// Initialize conditions, be careful to not continually update them
v3.ClusterConditionPending.CreateUnknownIfNotExists(cluster)
v3.ClusterConditionProvisioned.CreateUnknownIfNotExists(cluster)
if v3.ClusterConditionWaiting.GetStatus(cluster) == "" {
v3.ClusterConditionWaiting.Unknown(cluster)
}
if v3.ClusterConditionWaiting.GetMessage(cluster) == "" {
v3.ClusterConditionWaiting.Message(cluster, "Waiting for API to be available")
}
cluster, err = p.pending(cluster)
if err != nil {
return cluster, err
}
return p.provision(cluster)
}
func (p *Provisioner) provision(cluster *v3.Cluster) (*v3.Cluster, error) {
obj, err := v3.ClusterConditionProvisioned.Do(cluster, func() (runtime.Object, error) {
return p.update(cluster, true)
})
return obj.(*v3.Cluster), err
}
func (p *Provisioner) pending(cluster *v3.Cluster) (*v3.Cluster, error) {
obj, err := v3.ClusterConditionPending.DoUntilTrue(cluster, func() (runtime.Object, error) {
if skipProvisioning(cluster) {
return cluster, nil
}
driver, err := p.validateDriver(cluster)
if err != nil {
return cluster, err
}
if driver == "" {
return cluster, &controller.ForgetError{Err: fmt.Errorf("waiting for full cluster configuration")}
}
if driver != cluster.Status.Driver {
cluster.Status.Driver = driver
if driver == v3.ClusterDriverRKE && cluster.Spec.RancherKubernetesEngineConfig == nil {
cluster.Spec.RancherKubernetesEngineConfig = &v3.RancherKubernetesEngineConfig{}
}
return p.Clusters.Update(cluster)
}
return cluster, nil
})
return obj.(*v3.Cluster), err
}
func (p *Provisioner) backoffFailure(cluster *v3.Cluster, spec *v3.ClusterSpec) (bool, time.Duration) {
if cluster.Status.FailedSpec == nil {
return false, 0
}
if !reflect.DeepEqual(cluster.Status.FailedSpec, spec) {
return false, 0
}
if p.backoff.IsInBackOffSinceUpdate(cluster.Name, time.Now()) {
go func() {
time.Sleep(p.backoff.Get(cluster.Name))
p.ClusterController.Enqueue("", cluster.Name)
}()
return true, p.backoff.Get(cluster.Name)
}
return false, 0
}
// reconcileCluster returns true if waiting or false if ready to provision
func (p *Provisioner) reconcileCluster(cluster *v3.Cluster, create bool) (*v3.Cluster, error) {
if skipProvisioning(cluster) {
return cluster, nil
}
var (
apiEndpoint, serviceAccountToken, caCert string
err error
)
if cluster.Name != "local" && !v3.ClusterConditionServiceAccountMigrated.IsTrue(cluster) &&
v3.ClusterConditionProvisioned.IsTrue(cluster) {
driverName, err := p.validateDriver(cluster)
if err != nil {
return nil, err
}
spec, _, err := p.getConfig(true, cluster.Spec, driverName, cluster.Name)
if err != nil {
return nil, err
}
serviceAccountToken, err = p.generateServiceAccount(cluster, *spec)
if err != nil {
return nil, err
}
cluster.Status.ServiceAccountToken = serviceAccountToken
v3.ClusterConditionServiceAccountMigrated.True(cluster)
// Update the cluster in k8s
cluster, err = p.Clusters.Update(cluster)
if err != nil {
return nil, err
}
err = p.removeLegacyServiceAccount(cluster, *spec)
if err != nil {
return nil, err
}
}
spec, err := p.getSpec(cluster)
if err != nil || spec == nil {
return cluster, err
}
if ok, delay := p.backoffFailure(cluster, spec); ok {
return cluster, &controller.ForgetError{Err: fmt.Errorf("backing off failure, delay: %v", delay)}
}
logrus.Infof("Provisioning cluster [%s]", cluster.Name)
if create {
logrus.Infof("Creating cluster [%s]", cluster.Name)
apiEndpoint, serviceAccountToken, caCert, err = p.driverCreate(cluster, *spec)
if err != nil && err.Error() == "cluster already exists" {
logrus.Infof("Create done, Updating cluster [%s]", cluster.Name)
apiEndpoint, serviceAccountToken, caCert, err = p.driverUpdate(cluster, *spec)
}
} else if spec.RancherKubernetesEngineConfig != nil && spec.RancherKubernetesEngineConfig.RotateCertificates != nil {
logrus.Infof("Rotating certificates for cluster [%s]", cluster.Name)
apiEndpoint, serviceAccountToken, caCert, err = p.driverUpdate(cluster, *spec)
} else {
logrus.Infof("Updating cluster [%s]", cluster.Name)
apiEndpoint, serviceAccountToken, caCert, err = p.driverUpdate(cluster, *spec)
}
// at this point we know the cluster has been modified in driverCreate/Update so reload
if newCluster, reloadErr := p.Clusters.Get(cluster.Name, metav1.GetOptions{}); reloadErr == nil {
cluster = newCluster
}
cluster, recordErr := p.recordFailure(cluster, *spec, err)
if recordErr != nil {
return cluster, recordErr
}
// for here out we want to always return the cluster, not just nil, so that the error can be properly
// recorded if needs be
if err != nil {
return cluster, err
}
err = p.removeLegacyServiceAccount(cluster, *spec)
if err != nil {
return nil, err
}
v3.ClusterConditionServiceAccountMigrated.True(cluster)
saved := false
for i := 0; i < 20; i++ {
cluster, err = p.Clusters.Get(cluster.Name, metav1.GetOptions{})
if err != nil {
return cluster, err
}
cluster.Status.AppliedSpec = *spec
cluster.Status.APIEndpoint = apiEndpoint
cluster.Status.ServiceAccountToken = serviceAccountToken
cluster.Status.CACert = caCert
resetRkeConfigFlags(cluster)
if cluster, err = p.Clusters.Update(cluster); err == nil {
saved = true
break
} else {
logrus.Errorf("failed to update cluster [%s]: %v", cluster.Name, err)
time.Sleep(2)
}
}
if !saved {
return cluster, fmt.Errorf("failed to update cluster")
}
logrus.Infof("Provisioned cluster [%s]", cluster.Name)
return cluster, nil
}
func skipProvisioning(cluster *v3.Cluster) bool {
return cluster.Status.Driver == v3.ClusterDriverLocal || cluster.Status.Driver == v3.ClusterDriverImported
}
func (p *Provisioner) getConfig(reconcileRKE bool, spec v3.ClusterSpec, driverName, clusterName string) (*v3.ClusterSpec, interface{}, error) {
data, err := convert.EncodeToMap(spec)
if err != nil {
return nil, nil, err
}
v, ok := data[driverName+"Config"]
if !ok || v == nil {
v = map[string]interface{}{}
}
if driverName == v3.ClusterDriverRKE && reconcileRKE {
nodes, err := p.reconcileRKENodes(clusterName)
if err != nil {
return nil, nil, err
}
systemImages, err := getSystemImages(spec)
if err != nil {
return nil, nil, err
}
copy := *spec.RancherKubernetesEngineConfig
spec.RancherKubernetesEngineConfig = ©
spec.RancherKubernetesEngineConfig.Nodes = nodes
spec.RancherKubernetesEngineConfig.SystemImages = *systemImages
data, _ = convert.EncodeToMap(spec)
v = data[RKEDriverKey]
}
return &spec, v, nil
}
func (p *Provisioner) getDriver(cluster *v3.Cluster) string {
driver := configfield.GetDriver(&cluster.Spec)
if driver == "" {
nodes, err := p.reconcileRKENodes(cluster.Name)
if err == nil && len(nodes) > 0 {
return v3.ClusterDriverRKE
}
}
return driver
}
func (p *Provisioner) validateDriver(cluster *v3.Cluster) (string, error) {
oldDriver := cluster.Status.Driver
if oldDriver == v3.ClusterDriverImported {
return v3.ClusterDriverImported, nil
}
newDriver := p.getDriver(cluster)
if oldDriver == "" && newDriver == "" {
return newDriver, nil
}
if oldDriver == "" {
return newDriver, nil
}
if newDriver == "" {
return "", &controller.ForgetError{Err: fmt.Errorf("waiting for nodes")}
}
if oldDriver != newDriver {
return newDriver, fmt.Errorf("driver change from %s to %s not allowed", oldDriver, newDriver)
}
return newDriver, nil
}
func getSystemImages(spec v3.ClusterSpec) (*v3.RKESystemImages, error) {
// fetch system images from settings
version := spec.RancherKubernetesEngineConfig.Version
systemImages, ok := v3.AllK8sVersions[version]
if !ok {
return nil, fmt.Errorf("failed to find system images for version %v", version)
}
privateRegistry := getPrivateRepo(spec.RancherKubernetesEngineConfig)
if privateRegistry == "" {
return &systemImages, nil
}
// prepend private repo
imagesMap, err := convert.EncodeToMap(systemImages)
if err != nil {
return nil, err
}
updatedMap := make(map[string]interface{})
for key, value := range imagesMap {
newValue := fmt.Sprintf("%s/%s", privateRegistry, value)
updatedMap[key] = newValue
}
if err := mapstructure.Decode(updatedMap, &systemImages); err != nil {
return nil, err
}
return &systemImages, nil
}
func getPrivateRepo(config *v3.RancherKubernetesEngineConfig) string {
if len(config.PrivateRegistries) > 0 {
return config.PrivateRegistries[0].URL
}
return settings.SystemDefaultRegistry.Get()
}
func (p *Provisioner) getSpec(cluster *v3.Cluster) (*v3.ClusterSpec, error) {
driverName, err := p.validateDriver(cluster)
if err != nil {
return nil, err
}
_, oldConfig, err := p.getConfig(false, cluster.Status.AppliedSpec, driverName, cluster.Name)
if err != nil {
return nil, err
}
newSpec, newConfig, err := p.getConfig(true, cluster.Spec, driverName, cluster.Name)
if err != nil {
return nil, err
}
if reflect.DeepEqual(oldConfig, newConfig) {
newSpec = nil
}
return newSpec, nil
}
func (p *Provisioner) reconcileRKENodes(clusterName string) ([]v3.RKEConfigNode, error) {
machines, err := p.NodeLister.List(clusterName, labels.Everything())
if err != nil {
return nil, err
}
etcd := false
controlplane := false
var nodes []v3.RKEConfigNode
for _, machine := range machines {
if machine.DeletionTimestamp != nil {
continue
}
if v3.NodeConditionProvisioned.IsUnknown(machine) && (machine.Spec.Etcd || machine.Spec.ControlPlane) {
return nil, &controller.ForgetError{
Err: fmt.Errorf("waiting for %s to finish provisioning", machine.Spec.RequestedHostname),
}
}
if machine.Status.NodeConfig == nil {
continue
}
if len(machine.Status.NodeConfig.Role) == 0 {
continue
}
if !v3.NodeConditionProvisioned.IsTrue(machine) {
continue
}
if slice.ContainsString(machine.Status.NodeConfig.Role, services.ETCDRole) {
etcd = true
}
if slice.ContainsString(machine.Status.NodeConfig.Role, services.ControlRole) {
controlplane = true
}
node := *machine.Status.NodeConfig
if node.User == "" {
node.User = "root"
}
if node.Port == "" {
node.Port = "22"
}
if node.NodeName == "" {
node.NodeName = ref.FromStrings(machine.Namespace, machine.Name)
}
nodes = append(nodes, node)
}
if !etcd || !controlplane {
return nil, &controller.ForgetError{
Err: fmt.Errorf("waiting for etcd and controlplane nodes to be registered"),
}
}
sort.Slice(nodes, func(i, j int) bool {
return nodes[i].NodeName < nodes[j].NodeName
})
return nodes, nil
}
func (p *Provisioner) recordFailure(cluster *v3.Cluster, spec v3.ClusterSpec, err error) (*v3.Cluster, error) {
if err == nil {
p.backoff.DeleteEntry(cluster.Name)
if cluster.Status.FailedSpec == nil {
return cluster, nil
}
cluster.Status.FailedSpec = nil
return p.Clusters.Update(cluster)
}
p.backoff.Next(cluster.Name, time.Now())
cluster.Status.FailedSpec = &spec
newCluster, _ := p.Clusters.Update(cluster)
// mask the error
return newCluster, nil
}
func resetRkeConfigFlags(cluster *v3.Cluster) {
if cluster.Spec.RancherKubernetesEngineConfig != nil {
cluster.Spec.RancherKubernetesEngineConfig.RotateCertificates = nil
if cluster.Status.AppliedSpec.RancherKubernetesEngineConfig != nil {
cluster.Status.AppliedSpec.RancherKubernetesEngineConfig.RotateCertificates = nil
}
}
}