/
root.go
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/
root.go
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// Copyright © 2017 The virtual-kubelet authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package root
import (
"context"
"crypto/tls"
"net/http"
"os"
"runtime"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"github.com/virtual-kubelet/virtual-kubelet/cmd/virtual-kubelet/internal/provider"
"github.com/virtual-kubelet/virtual-kubelet/errdefs"
"github.com/virtual-kubelet/virtual-kubelet/internal/manager"
"github.com/virtual-kubelet/virtual-kubelet/log"
"github.com/virtual-kubelet/virtual-kubelet/node"
"github.com/virtual-kubelet/virtual-kubelet/node/api"
"github.com/virtual-kubelet/virtual-kubelet/node/nodeutil"
corev1 "k8s.io/api/core/v1"
"k8s.io/apiserver/pkg/server/dynamiccertificates"
)
// NewCommand creates a new top-level command.
// This command is used to start the virtual-kubelet daemon
func NewCommand(ctx context.Context, name string, s *provider.Store, c Opts) *cobra.Command {
cmd := &cobra.Command{
Use: name,
Short: name + " provides a virtual kubelet interface for your kubernetes cluster.",
Long: name + ` implements the Kubelet interface with a pluggable
backend implementation allowing users to create kubernetes nodes without running the kubelet.
This allows users to schedule kubernetes workloads on nodes that aren't running Kubernetes.`,
RunE: func(cmd *cobra.Command, args []string) error {
return runRootCommand(ctx, s, c)
},
}
installFlags(cmd.Flags(), &c)
return cmd
}
func runRootCommand(ctx context.Context, s *provider.Store, c Opts) error {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
if ok := provider.ValidOperatingSystems[c.OperatingSystem]; !ok {
return errdefs.InvalidInputf("operating system %q is not supported", c.OperatingSystem)
}
if c.PodSyncWorkers == 0 {
return errdefs.InvalidInput("pod sync workers must be greater than 0")
}
var taint *corev1.Taint
if !c.DisableTaint {
var err error
taint, err = getTaint(c)
if err != nil {
return err
}
}
mux := http.NewServeMux()
newProvider := func(cfg nodeutil.ProviderConfig) (nodeutil.Provider, node.NodeProvider, error) {
rm, err := manager.NewResourceManager(cfg.Pods, cfg.Secrets, cfg.ConfigMaps, cfg.Services)
if err != nil {
return nil, nil, errors.Wrap(err, "could not create resource manager")
}
initConfig := provider.InitConfig{
ConfigPath: c.ProviderConfigPath,
NodeName: c.NodeName,
OperatingSystem: c.OperatingSystem,
ResourceManager: rm,
DaemonPort: c.ListenPort,
InternalIP: os.Getenv("VKUBELET_POD_IP"),
KubeClusterDomain: c.KubeClusterDomain,
}
pInit := s.Get(c.Provider)
if pInit == nil {
return nil, nil, errors.Errorf("provider %q not found", c.Provider)
}
p, err := pInit(initConfig)
if err != nil {
return nil, nil, errors.Wrapf(err, "error initializing provider %s", c.Provider)
}
p.ConfigureNode(ctx, cfg.Node)
cfg.Node.Status.NodeInfo.KubeletVersion = c.Version
return p, nil, nil
}
apiConfig, err := getAPIConfig(c)
if err != nil {
return err
}
cm, err := nodeutil.NewNode(c.NodeName, newProvider, func(cfg *nodeutil.NodeConfig) error {
cfg.KubeconfigPath = c.KubeConfigPath
cfg.Handler = mux
cfg.InformerResyncPeriod = c.InformerResyncPeriod
if taint != nil {
cfg.NodeSpec.Spec.Taints = append(cfg.NodeSpec.Spec.Taints, *taint)
}
cfg.NodeSpec.Status.NodeInfo.Architecture = runtime.GOARCH
cfg.NodeSpec.Status.NodeInfo.OperatingSystem = c.OperatingSystem
cfg.HTTPListenAddr = apiConfig.Addr
cfg.StreamCreationTimeout = apiConfig.StreamCreationTimeout
cfg.StreamIdleTimeout = apiConfig.StreamIdleTimeout
cfg.DebugHTTP = true
cfg.NumWorkers = c.PodSyncWorkers
return nil
},
setAuth(c.NodeName, apiConfig),
nodeutil.WithTLSConfig(
nodeutil.WithKeyPairFromPath(apiConfig.CertPath, apiConfig.KeyPath),
maybeCA(apiConfig.CACertPath),
),
nodeutil.AttachProviderRoutes(mux),
)
if err != nil {
return err
}
if err := setupTracing(ctx, c); err != nil {
return err
}
ctx = log.WithLogger(ctx, log.G(ctx).WithFields(log.Fields{
"provider": c.Provider,
"operatingSystem": c.OperatingSystem,
"node": c.NodeName,
"watchedNamespace": c.KubeNamespace,
}))
go cm.Run(ctx) //nolint:errcheck
defer func() {
log.G(ctx).Debug("Waiting for controllers to be done")
cancel()
<-cm.Done()
}()
log.G(ctx).Info("Waiting for controller to be ready")
if err := cm.WaitReady(ctx, c.StartupTimeout); err != nil {
return err
}
log.G(ctx).Info("Ready")
select {
case <-ctx.Done():
case <-cm.Done():
return cm.Err()
}
return nil
}
func setAuth(node string, apiCfg *apiServerConfig) nodeutil.NodeOpt {
if apiCfg.CACertPath == "" {
return func(cfg *nodeutil.NodeConfig) error {
cfg.Handler = api.InstrumentHandler(nodeutil.WithAuth(nodeutil.NoAuth(), cfg.Handler))
return nil
}
}
return func(cfg *nodeutil.NodeConfig) error {
auth, err := nodeutil.WebhookAuth(cfg.Client, node, func(cfg *nodeutil.WebhookAuthConfig) error {
var err error
cfg.AuthnConfig.ClientCertificateCAContentProvider, err = dynamiccertificates.NewDynamicCAContentFromFile("ca-cert-bundle", apiCfg.CACertPath)
return err
})
if err != nil {
return err
}
cfg.Handler = api.InstrumentHandler(nodeutil.WithAuth(auth, cfg.Handler))
return nil
}
}
func maybeCA(p string) func(*tls.Config) error {
if p == "" {
return func(*tls.Config) error { return nil }
}
return nodeutil.WithCAFromPath(p)
}