forked from kubernetes/minikube
/
kubeadm.go
377 lines (324 loc) · 11.1 KB
/
kubeadm.go
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/*
Copyright 2016 The Kubernetes Authors All rights reserved.
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 kubeadm
import (
"bytes"
"crypto"
"fmt"
"os"
"path"
"strings"
"time"
"github.com/docker/machine/libmachine"
"github.com/docker/machine/libmachine/state"
"github.com/golang/glog"
download "github.com/jimmidyson/go-download"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
"k8s.io/minikube/pkg/minikube/assets"
"k8s.io/minikube/pkg/minikube/bootstrapper"
"k8s.io/minikube/pkg/minikube/config"
"k8s.io/minikube/pkg/minikube/constants"
"k8s.io/minikube/pkg/minikube/machine"
"k8s.io/minikube/pkg/minikube/sshutil"
"k8s.io/minikube/pkg/util"
)
type KubeadmBootstrapper struct {
c bootstrapper.CommandRunner
}
func NewKubeadmBootstrapper(api libmachine.API) (*KubeadmBootstrapper, error) {
h, err := api.Load(config.GetMachineName())
if err != nil {
return nil, errors.Wrap(err, "getting api client")
}
var cmd bootstrapper.CommandRunner
// The none driver executes commands directly on the host
if h.Driver.DriverName() == constants.DriverNone {
cmd = &bootstrapper.ExecRunner{}
} else {
client, err := sshutil.NewSSHClient(h.Driver)
if err != nil {
return nil, errors.Wrap(err, "getting ssh client")
}
cmd = bootstrapper.NewSSHRunner(client)
}
return &KubeadmBootstrapper{
c: cmd,
}, nil
}
//TODO(r2d4): This should most likely check the health of the apiserver
func (k *KubeadmBootstrapper) GetClusterStatus() (string, error) {
statusCmd := `sudo systemctl is-active kubelet &>/dev/null && echo "Running" || echo "Stopped"`
status, err := k.c.CombinedOutput(statusCmd)
if err != nil {
return "", errors.Wrap(err, "getting status")
}
status = strings.TrimSpace(status)
if status == state.Running.String() || status == state.Stopped.String() {
return status, nil
}
return "", fmt.Errorf("Error: Unrecognized output from ClusterStatus: %s", status)
}
// TODO(r2d4): Should this aggregate all the logs from the control plane?
// Maybe subcommands for each component? minikube logs apiserver?
func (k *KubeadmBootstrapper) GetClusterLogs(follow bool) (string, error) {
var flags []string
if follow {
flags = append(flags, "-f")
}
logsCommand := fmt.Sprintf("sudo journalctl %s -u kubelet", strings.Join(flags, " "))
if follow {
if err := k.c.Run(logsCommand); err != nil {
return "", errors.Wrap(err, "getting shell")
}
}
logs, err := k.c.CombinedOutput(logsCommand)
if err != nil {
return "", errors.Wrap(err, "getting cluster logs")
}
return logs, nil
}
func (k *KubeadmBootstrapper) StartCluster(k8s bootstrapper.KubernetesConfig) error {
// We use --skip-preflight-checks since we have our own custom addons
// that we also stick in /etc/kubernetes/manifests
b := bytes.Buffer{}
if err := kubeadmInitTemplate.Execute(&b, struct{ KubeadmConfigFile string }{constants.KubeadmConfigFile}); err != nil {
return err
}
err := k.c.Run(b.String())
if err != nil {
return errors.Wrapf(err, "kubeadm init error running command: %s", b.String())
}
//TODO(r2d4): get rid of global here
master = k8s.NodeName
if err := util.RetryAfter(100, unmarkMaster, time.Millisecond*500); err != nil {
return errors.Wrap(err, "timed out waiting to unmark master")
}
if err := util.RetryAfter(100, elevateKubeSystemPrivileges, time.Millisecond*500); err != nil {
return errors.Wrap(err, "timed out waiting to elevate kube-system RBAC privileges")
}
return nil
}
//TODO(r2d4): Split out into shared function between localkube and kubeadm
func addAddons(files *[]assets.CopyableFile) error {
// add addons to file list
// custom addons
assets.AddMinikubeDirToAssets("addons", constants.AddonsPath, files)
// bundled addons
for addonName, addonBundle := range assets.Addons {
// TODO(r2d4): Kubeadm ignores the kube-dns addon and uses its own.
// expose this in a better way
if addonName == "kube-dns" {
continue
}
if isEnabled, err := addonBundle.IsEnabled(); err == nil && isEnabled {
for _, addon := range addonBundle.Assets {
*files = append(*files, addon)
}
} else if err != nil {
return nil
}
}
return nil
}
func (k *KubeadmBootstrapper) RestartCluster(k8s bootstrapper.KubernetesConfig) error {
opts := struct {
KubeadmConfigFile string
}{
KubeadmConfigFile: constants.KubeadmConfigFile,
}
b := bytes.Buffer{}
if err := kubeadmRestoreTemplate.Execute(&b, opts); err != nil {
return err
}
if err := k.c.Run(b.String()); err != nil {
return errors.Wrapf(err, "running cmd: %s", b.String())
}
if err := restartKubeProxy(k8s); err != nil {
return errors.Wrap(err, "restarting kube-proxy")
}
return nil
}
func (k *KubeadmBootstrapper) SetupCerts(k8s bootstrapper.KubernetesConfig) error {
return bootstrapper.SetupCerts(k.c, k8s)
}
// SetContainerRuntime possibly sets the container runtime, if it hasn't already
// been specified by the extra-config option. It has a set of defaults known to
// work for a particular runtime.
func SetContainerRuntime(cfg map[string]string, runtime string) map[string]string {
if _, ok := cfg["container-runtime"]; ok {
glog.Infoln("Container runtime already set through extra options, ignoring --container-runtime flag.")
return cfg
}
if runtime == "" {
glog.Infoln("Container runtime flag provided with no value, using defaults.")
return cfg
}
switch runtime {
case "crio", "cri-o":
cfg["container-runtime"] = "remote"
cfg["container-runtime-endpoint"] = "/var/run/crio.sock"
cfg["image-service-endpoint"] = "/var/run/crio.sock"
cfg["runtime-request-timeout"] = "15m"
default:
cfg["container-runtime"] = runtime
}
return cfg
}
// NewKubeletConfig generates a new systemd unit containing a configured kubelet
// based on the options present in the KubernetesConfig.
func NewKubeletConfig(k8s bootstrapper.KubernetesConfig) (string, error) {
version, err := ParseKubernetesVersion(k8s.KubernetesVersion)
if err != nil {
return "", errors.Wrap(err, "parsing kubernetes version")
}
extraOpts, err := ExtraConfigForComponent(Kubelet, k8s.ExtraOptions, version)
if err != nil {
return "", errors.Wrap(err, "generating extra configuration for kubelet")
}
extraOpts = SetContainerRuntime(extraOpts, k8s.ContainerRuntime)
extraFlags := convertToFlags(extraOpts)
b := bytes.Buffer{}
opts := struct {
ExtraOptions string
FeatureGates string
ContainerRuntime string
}{
ExtraOptions: extraFlags,
FeatureGates: k8s.FeatureGates,
ContainerRuntime: k8s.ContainerRuntime,
}
if err := kubeletSystemdTemplate.Execute(&b, opts); err != nil {
return "", err
}
return b.String(), nil
}
func (k *KubeadmBootstrapper) UpdateCluster(cfg bootstrapper.KubernetesConfig) error {
if cfg.ShouldLoadCachedImages {
// Make best effort to load any cached images
go machine.LoadImages(k.c, constants.GetKubeadmCachedImages(cfg.KubernetesVersion), constants.ImageCacheDir)
}
kubeadmCfg, err := generateConfig(cfg)
if err != nil {
return errors.Wrap(err, "generating kubeadm cfg")
}
kubeletCfg, err := NewKubeletConfig(cfg)
if err != nil {
return errors.Wrap(err, "generating kubelet config")
}
files := []assets.CopyableFile{
assets.NewMemoryAssetTarget([]byte(kubeletService), constants.KubeletServiceFile, "0640"),
assets.NewMemoryAssetTarget([]byte(kubeletCfg), constants.KubeletSystemdConfFile, "0640"),
assets.NewMemoryAssetTarget([]byte(kubeadmCfg), constants.KubeadmConfigFile, "0640"),
}
if err := addAddons(&files); err != nil {
return errors.Wrap(err, "adding addons to copyable files")
}
for _, f := range files {
if err := k.c.Copy(f); err != nil {
return errors.Wrapf(err, "transferring kubeadm file: %+v", f)
}
}
var g errgroup.Group
for _, bin := range []string{"kubelet", "kubeadm"} {
bin := bin
g.Go(func() error {
path, err := maybeDownloadAndCache(bin, cfg.KubernetesVersion)
if err != nil {
return errors.Wrapf(err, "downloading %s", bin)
}
f, err := assets.NewFileAsset(path, "/usr/bin", bin, "0641")
if err != nil {
return errors.Wrap(err, "making new file asset")
}
if err := k.c.Copy(f); err != nil {
return errors.Wrapf(err, "transferring kubeadm file: %+v", f)
}
return nil
})
}
if err := g.Wait(); err != nil {
return errors.Wrap(err, "downloading binaries")
}
err = k.c.Run(`
sudo systemctl daemon-reload &&
sudo systemctl enable kubelet &&
sudo systemctl start kubelet
`)
if err != nil {
return errors.Wrap(err, "starting kubelet")
}
return nil
}
func generateConfig(k8s bootstrapper.KubernetesConfig) (string, error) {
version, err := ParseKubernetesVersion(k8s.KubernetesVersion)
if err != nil {
return "", errors.Wrap(err, "parsing kubernetes version")
}
// generates a map of component to extra args for apiserver, controller-manager, and scheduler
extraComponentConfig, err := NewComponentExtraArgs(k8s.ExtraOptions, version, k8s.FeatureGates)
if err != nil {
return "", errors.Wrap(err, "generating extra component config for kubeadm")
}
opts := struct {
CertDir string
ServiceCIDR string
AdvertiseAddress string
APIServerPort int
KubernetesVersion string
EtcdDataDir string
NodeName string
ExtraArgs []ComponentExtraArgs
}{
CertDir: util.DefaultCertPath,
ServiceCIDR: util.DefaultInsecureRegistry,
AdvertiseAddress: k8s.NodeIP,
APIServerPort: util.APIServerPort,
KubernetesVersion: k8s.KubernetesVersion,
EtcdDataDir: "/data", //TODO(r2d4): change to something else persisted
NodeName: k8s.NodeName,
ExtraArgs: extraComponentConfig,
}
b := bytes.Buffer{}
if err := kubeadmConfigTemplate.Execute(&b, opts); err != nil {
return "", err
}
return b.String(), nil
}
func maybeDownloadAndCache(binary, version string) (string, error) {
targetDir := constants.MakeMiniPath("cache", version)
targetFilepath := path.Join(targetDir, binary)
_, err := os.Stat(targetFilepath)
// If it exists, do no verification and continue
if err == nil {
return targetFilepath, nil
}
if !os.IsNotExist(err) {
return "", errors.Wrapf(err, "stat %s version %s at %s", binary, version, targetDir)
}
if err = os.MkdirAll(targetDir, 0777); err != nil {
return "", errors.Wrapf(err, "mkdir %s", targetDir)
}
url := constants.GetKubernetesReleaseURL(binary, version)
options := download.FileOptions{
Mkdirs: download.MkdirAll,
}
options.Checksum = constants.GetKubernetesReleaseURLSha1(binary, version)
options.ChecksumHash = crypto.SHA1
fmt.Printf("Downloading %s %s\n", binary, version)
if err := download.ToFile(url, targetFilepath, options); err != nil {
return "", errors.Wrapf(err, "Error downloading %s %s", binary, version)
}
fmt.Printf("Finished Downloading %s %s\n", binary, version)
return targetFilepath, nil
}