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kubeadm.go
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kubeadm.go
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package service
import (
"bytes"
"context"
"fmt"
"html/template"
"io/ioutil"
"log"
"os"
"path"
"strconv"
"strings"
"time"
"github.com/autonomy/dianemo/src/initramfs/cmd/init/pkg/constants"
"github.com/autonomy/dianemo/src/initramfs/cmd/init/pkg/service/conditions"
"github.com/autonomy/dianemo/src/initramfs/cmd/rotd/proto"
"github.com/autonomy/dianemo/src/initramfs/pkg/crypto/x509"
"github.com/autonomy/dianemo/src/initramfs/pkg/grpc/middleware/auth/basic"
"github.com/autonomy/dianemo/src/initramfs/pkg/net"
"github.com/autonomy/dianemo/src/initramfs/pkg/userdata"
"google.golang.org/grpc"
kubeadmconstants "k8s.io/kubernetes/cmd/kubeadm/app/constants"
)
const kubeadmSH = `#!/bin/bash
set -eou pipefail
cd /etc/kubernetes
{{- if .Init }}
{{- if eq .Init.Type "initial" }}
kubeadm init --config=kubeadm-config.yaml --ignore-preflight-errors=cri --skip-token-print
{{- else if eq .Init.Type "dependent" }}
export KUBECONFIG=/etc/kubernetes/admin.conf
kubeadm alpha phase certs all --config kubeadm-config.yaml
kubeadm alpha phase kubelet config write-to-disk --config kubeadm-config.yaml
kubeadm alpha phase kubelet write-env-file --config kubeadm-config.yaml
kubeadm alpha phase kubeconfig kubelet --config kubeadm-config.yaml
# Workaround for clusters running with the DenyEscalatingExec admission controller.
docker run \
--rm \
--net=host \
--volume /etc/kubernetes/pki/etcd:/etc/kubernetes/pki/etcd k8s.gcr.io/etcd:{{ .EtcdVersion }} \
etcdctl --ca-file /etc/kubernetes/pki/etcd/ca.crt --cert-file /etc/kubernetes/pki/etcd/peer.crt --key-file /etc/kubernetes/pki/etcd/peer.key --endpoints=https://{{ .Init.EtcdEndpoint }}:2379 member add {{ .Init.EtcdMemberName }} https://{{ .IP }}:2380
kubeadm alpha phase etcd local --config kubeadm-config.yaml
kubeadm alpha phase kubeconfig all --config kubeadm-config.yaml
{{- if not .Init.SelfHosted }}
kubeadm alpha phase controlplane all --config kubeadm-config.yaml
{{- end }}
kubeadm alpha phase mark-master --config kubeadm-config.yaml
echo "successfully joined master node {{ .Hostname }}"
{{- end }}
{{- else }}
kubeadm join --config=kubeadm-config.yaml --ignore-preflight-errors=cri
{{- end }}
`
// Kubeadm implements the Service interface. It serves as the concrete type with
// the required methods.
type Kubeadm struct{}
// Pre implements the Service interface.
func (p *Kubeadm) Pre(data userdata.UserData) (err error) {
if data.Services.Kubeadm.Init != nil {
if err = writeKubeadmPKIFiles(data.Security.Kubernetes.CA); err != nil {
return
}
}
if err = writeKubeadmConfig(data.Services.Kubeadm.Configuration); err != nil {
return
}
return nil
}
// Post implements the Service interface.
func (p *Kubeadm) Post(data userdata.UserData) (err error) {
if data.Services.Kubeadm.Init != nil && data.Services.Kubeadm.Init.TrustEndpoint == "" {
return nil
}
creds := basic.NewCredentials(
data.Security.OS.CA.Crt,
data.Services.ROTD.Username,
data.Services.ROTD.Password,
)
var conn *grpc.ClientConn
parts := strings.Split(data.Services.Kubeadm.Init.TrustEndpoint, ":")
if len(parts) != 2 {
return fmt.Errorf("trust endpoint is not valid")
}
i, err := strconv.Atoi(parts[1])
if err != nil {
return err
}
conn, err = basic.NewConnection(parts[0], i, creds)
if err != nil {
return
}
client := proto.NewROTDClient(conn)
files := []string{
"/etc/kubernetes/pki/ca.crt",
"/etc/kubernetes/pki/ca.key",
"/etc/kubernetes/pki/sa.key",
"/etc/kubernetes/pki/sa.pub",
"/etc/kubernetes/pki/front-proxy-ca.crt",
"/etc/kubernetes/pki/front-proxy-ca.key",
"/etc/kubernetes/pki/etcd/ca.crt",
"/etc/kubernetes/pki/etcd/ca.key",
"/etc/kubernetes/admin.conf",
}
if err = writeFiles(client, files); err != nil {
return
}
return nil
}
// Cmd implements the Service interface.
func (p *Kubeadm) Cmd(data userdata.UserData, cmdArgs *CmdArgs) error {
cmdArgs.Name = "kubeadm"
cmdArgs.Path = "/bin/docker"
cmdArgs.Args = []string{
"run",
"--rm",
"--net=host",
"--pid=host",
"--privileged",
"--volume=/sys:/sys:rw",
"--volume=/sys/fs/cgroup:/sys/fs/cgroup:rw",
"--volume=/var/run:/var/run:rw",
"--volume=/run:/run:rw",
"--volume=/var/lib/docker:/var/lib/docker:rw",
"--volume=/var/lib/kubelet:/var/lib/kubelet:slave",
"--volume=/var/log:/var/log",
"--volume=/etc/kubernetes:/etc/kubernetes:shared",
"--volume=/etc/os-release:/etc/os-release:ro",
"--volume=/lib/modules:/lib/modules:ro",
"--volume=/bin/docker:/bin/docker:ro",
"--volume=/bin/crictl:/bin/crictl:ro",
"--volume=/bin/kubeadm:/bin/kubeadm:ro",
"--volume=/run/kubeadm.sh:/bin/kubeadm.sh:ro",
"--name=kubeadm",
"gcr.io/google_containers/hyperkube:v1.11.2",
"/bin/kubeadm.sh",
}
contents, err := parse(data)
if err != nil {
return err
}
err = ioutil.WriteFile("/run/kubeadm.sh", contents, os.FileMode(0700))
return err
}
// Condition implements the Service interface.
func (p *Kubeadm) Condition(data userdata.UserData) func() (bool, error) {
switch data.Services.Kubeadm.ContainerRuntime {
case constants.ContainerRuntimeDocker:
if data.Services.Kubeadm.Init != nil && data.Services.Kubeadm.Init.Type == "dependent" {
return conditions.WaitForFilesToExist(constants.ContainerRuntimeDockerSocket, "/etc/kubernetes/admin.conf")
}
return conditions.WaitForFileExists(constants.ContainerRuntimeDockerSocket)
case constants.ContainerRuntimeCRIO:
if data.Services.Kubeadm.Init != nil && data.Services.Kubeadm.Init.Type == "dependent" {
return conditions.WaitForFilesToExist(constants.ContainerRuntimeCRIOSocket, "/etc/kubernetes/admin.conf")
}
return conditions.WaitForFileExists(constants.ContainerRuntimeCRIOSocket)
default:
return conditions.None()
}
}
// Env implements the Service interface.
func (p *Kubeadm) Env() []string { return []string{} }
// Type implements the Service interface.
func (p *Kubeadm) Type() Type { return Once }
func writeKubeadmConfig(data string) (err error) {
if err = ioutil.WriteFile(constants.KubeadmConfig, []byte(data), 0400); err != nil {
return fmt.Errorf("write %s: %s", constants.KubeadmConfig, err.Error())
}
return nil
}
func writeKubeadmPKIFiles(data *x509.PEMEncodedCertificateAndKey) (err error) {
if err = os.MkdirAll(path.Dir(constants.KubeadmCACert), 0600); err != nil {
return err
}
if err = ioutil.WriteFile(constants.KubeadmCACert, data.Crt, 0400); err != nil {
return fmt.Errorf("write %s: %s", constants.KubeadmCACert, err.Error())
}
if err = os.MkdirAll(path.Dir(constants.KubeadmCAKey), 0600); err != nil {
return err
}
if err = ioutil.WriteFile(constants.KubeadmCAKey, data.Key, 0400); err != nil {
return fmt.Errorf("write %s: %s", constants.KubeadmCAKey, err.Error())
}
return nil
}
func parse(data userdata.UserData) ([]byte, error) {
ip, err := net.IP()
if err != nil {
return nil, err
}
hostname, err := os.Hostname()
if err != nil {
return nil, err
}
aux := struct {
IP string
Hostname string
Init *userdata.InitConfiguration
EtcdVersion string
}{
Hostname: hostname,
IP: ip.String(),
Init: data.Services.Kubeadm.Init,
EtcdVersion: kubeadmconstants.DefaultEtcdVersion,
}
t, err := template.New("kubeadm").Parse(kubeadmSH)
if err != nil {
return nil, err
}
b := []byte{}
buf := bytes.NewBuffer(b)
err = t.Execute(buf, aux)
return buf.Bytes(), err
}
func writeFiles(client proto.ROTDClient, files []string) (err error) {
errChan := make(chan error)
doneChan := make(chan bool)
ctx, cancelFunc := context.WithTimeout(context.Background(), 5*time.Minute)
defer cancelFunc()
go func() {
<-ctx.Done()
errChan <- ctx.Err()
}()
go func() {
for _, f := range files {
L:
b, err := ioutil.ReadFile(f)
if err != nil {
log.Printf("failed to read file %s: %v", f, err)
time.Sleep(1 * time.Second)
goto L
}
req := &proto.WriteFileRequest{
Path: f,
Data: b,
}
_, err = client.WriteFile(context.Background(), req)
if err != nil {
log.Printf("failed to write file %s: %v", f, err)
time.Sleep(1 * time.Second)
goto L
}
}
doneChan <- true
}()
select {
case err := <-errChan:
return err
case <-doneChan:
return nil
}
}