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config.go
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config.go
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package config
import (
"bufio"
"context"
cryptorand "crypto/rand"
"crypto/tls"
"encoding/hex"
"encoding/pem"
"fmt"
"io/ioutil"
sysnet "net"
"net/http"
"net/url"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"time"
"github.com/pkg/errors"
"github.com/rancher/k3s/pkg/cli/cmds"
"github.com/rancher/k3s/pkg/daemons/config"
"github.com/rancher/norman/pkg/clientaccess"
"github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/util/json"
"k8s.io/apimachinery/pkg/util/net"
"k8s.io/client-go/util/cert"
"k8s.io/kubernetes/pkg/kubelet/apis/deviceplugin/v1beta1"
)
func Get(ctx context.Context, agent cmds.Agent) *config.Node {
for {
agentConfig, err := get(&agent)
if err != nil {
logrus.Error(err)
select {
case <-time.After(5 * time.Second):
continue
case <-ctx.Done():
logrus.Fatalf("Interrupted")
}
}
return agentConfig
}
}
type HTTPRequester func(u string, client *http.Client, username, password string) ([]byte, error)
func Request(path string, info *clientaccess.Info, requester HTTPRequester) ([]byte, error) {
u, err := url.Parse(info.URL)
if err != nil {
return nil, err
}
u.Path = path
username, password, _ := clientaccess.ParseUsernamePassword(info.Token)
return requester(u.String(), clientaccess.GetHTTPClient(info.CACerts), username, password)
}
func getNodeNamedCrt(nodeName, nodePasswordFile string) HTTPRequester {
return func(u string, client *http.Client, username, password string) ([]byte, error) {
req, err := http.NewRequest(http.MethodGet, u, nil)
if err != nil {
return nil, err
}
if username != "" {
req.SetBasicAuth(username, password)
}
req.Header.Set("K3s-Node-Name", nodeName)
nodePassword, err := ensureNodePassword(nodePasswordFile)
if err != nil {
return nil, err
}
req.Header.Set("K3s-Node-Password", nodePassword)
resp, err := client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("%s: %s", u, resp.Status)
}
return ioutil.ReadAll(resp.Body)
}
}
func ensureNodePassword(nodePasswordFile string) (string, error) {
if _, err := os.Stat(nodePasswordFile); err == nil {
password, err := ioutil.ReadFile(nodePasswordFile)
return strings.TrimSpace(string(password)), err
}
password := make([]byte, 16, 16)
_, err := cryptorand.Read(password)
if err != nil {
return "", err
}
nodePassword := hex.EncodeToString(password)
return nodePassword, ioutil.WriteFile(nodePasswordFile, []byte(nodePassword), 0600)
}
func getNodeCert(nodeName, nodeCertFile, nodeKeyFile, nodePasswordFile string, info *clientaccess.Info) (*tls.Certificate, error) {
nodeCert, err := Request("/v1-k3s/node.crt", info, getNodeNamedCrt(nodeName, nodePasswordFile))
if err != nil {
return nil, err
}
if err := ioutil.WriteFile(nodeCertFile, nodeCert, 0600); err != nil {
return nil, errors.Wrapf(err, "failed to write node cert")
}
nodeKey, err := clientaccess.Get("/v1-k3s/node.key", info)
if err != nil {
return nil, err
}
if err := ioutil.WriteFile(nodeKeyFile, nodeKey, 0600); err != nil {
return nil, errors.Wrapf(err, "failed to write node key")
}
cert, err := tls.X509KeyPair(nodeCert, nodeKey)
if err != nil {
return nil, err
}
return &cert, nil
}
func writeNodeCA(dataDir string, nodeCert *tls.Certificate) (string, error) {
clientCABytes := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: nodeCert.Certificate[1],
})
clientCA := filepath.Join(dataDir, "client-ca.pem")
if err := ioutil.WriteFile(clientCA, clientCABytes, 0600); err != nil {
return "", errors.Wrapf(err, "failed to write client CA")
}
return clientCA, nil
}
func getHostnameAndIP(info cmds.Agent) (string, string, error) {
ip := info.NodeIP
if ip == "" {
hostIP, err := net.ChooseHostInterface()
if err != nil {
return "", "", err
}
ip = hostIP.String()
}
name := info.NodeName
if name == "" {
hostname, err := os.Hostname()
if err != nil {
return "", "", err
}
name = hostname
}
// Use lower case hostname to comply with kubernetes constraint:
// https://github.com/kubernetes/kubernetes/issues/71140
name = strings.ToLower(name)
return name, ip, nil
}
func localAddress(controlConfig *config.Control) string {
return fmt.Sprintf("127.0.0.1:%d", controlConfig.AdvertisePort)
}
func writeKubeConfig(envInfo *cmds.Agent, info clientaccess.Info, controlConfig *config.Control, nodeCert *tls.Certificate) (string, error) {
os.MkdirAll(envInfo.DataDir, 0700)
kubeConfigPath := filepath.Join(envInfo.DataDir, "kubeconfig.yaml")
info.URL = "https://" + localAddress(controlConfig)
info.CACerts = pem.EncodeToMemory(&pem.Block{
Type: cert.CertificateBlockType,
Bytes: nodeCert.Certificate[1],
})
return kubeConfigPath, info.WriteKubeConfig(kubeConfigPath)
}
func isValidResolvConf(resolvConfFile string) bool {
file, err := os.Open(resolvConfFile)
if err != nil {
return false
}
defer file.Close()
nameserver := regexp.MustCompile(`^nameserver\s+([^\s]*)`)
scanner := bufio.NewScanner(file)
for scanner.Scan() {
ipMatch := nameserver.FindStringSubmatch(scanner.Text())
if len(ipMatch) == 2 {
ip := sysnet.ParseIP(ipMatch[1])
if ip == nil || !ip.IsGlobalUnicast() {
return false
}
}
}
if err := scanner.Err(); err != nil {
return false
}
return true
}
func locateOrGenerateResolvConf(envInfo *cmds.Agent) string {
if envInfo.ResolvConf != "" {
return envInfo.ResolvConf
}
resolvConfs := []string{"/etc/resolv.conf", "/run/systemd/resolve/resolv.conf"}
for _, conf := range resolvConfs {
if isValidResolvConf(conf) {
return conf
}
}
tmpConf := filepath.Join(os.TempDir(), "k3s-resolv.conf")
if err := ioutil.WriteFile(tmpConf, []byte("nameserver 8.8.8.8\n"), 0444); err != nil {
logrus.Error(err)
return ""
}
return tmpConf
}
func get(envInfo *cmds.Agent) (*config.Node, error) {
if envInfo.Debug {
logrus.SetLevel(logrus.DebugLevel)
}
serverURLParsed, err := url.Parse(envInfo.ServerURL)
if err != nil {
return nil, err
}
info, err := clientaccess.ParseAndValidateToken(envInfo.ServerURL, envInfo.Token)
if err != nil {
return nil, err
}
controlConfig, err := getConfig(info)
if err != nil {
return nil, err
}
nodeName, nodeIP, err := getHostnameAndIP(*envInfo)
if err != nil {
return nil, err
}
hostnameCheck(nodeName)
nodeCertFile := filepath.Join(envInfo.DataDir, "token-node.crt")
nodeKeyFile := filepath.Join(envInfo.DataDir, "token-node.key")
nodePasswordFile := filepath.Join(envInfo.DataDir, "node-password.txt")
nodeCert, err := getNodeCert(nodeName, nodeCertFile, nodeKeyFile, nodePasswordFile, info)
if err != nil {
return nil, err
}
clientCA, err := writeNodeCA(envInfo.DataDir, nodeCert)
if err != nil {
return nil, err
}
kubeConfig, err := writeKubeConfig(envInfo, *info, controlConfig, nodeCert)
if err != nil {
return nil, err
}
hostLocal, err := exec.LookPath("host-local")
if err != nil {
return nil, errors.Wrapf(err, "failed to find host-local")
}
var flannelIface *sysnet.Interface
if !envInfo.NoFlannel && len(envInfo.FlannelIface) > 0 {
flannelIface, err = sysnet.InterfaceByName(envInfo.FlannelIface)
if err != nil {
return nil, errors.Wrapf(err, "unable to find interface")
}
}
nodeConfig := &config.Node{
Docker: envInfo.Docker,
NoFlannel: envInfo.NoFlannel,
ContainerRuntimeEndpoint: envInfo.ContainerRuntimeEndpoint,
}
nodeConfig.FlannelIface = flannelIface
nodeConfig.LocalAddress = localAddress(controlConfig)
nodeConfig.Images = filepath.Join(envInfo.DataDir, "images")
nodeConfig.AgentConfig.NodeIP = nodeIP
nodeConfig.AgentConfig.NodeName = nodeName
nodeConfig.AgentConfig.NodeCertFile = nodeCertFile
nodeConfig.AgentConfig.NodeKeyFile = nodeKeyFile
nodeConfig.AgentConfig.ClusterDNS = controlConfig.ClusterDNS
nodeConfig.AgentConfig.ClusterDomain = controlConfig.ClusterDomain
nodeConfig.AgentConfig.ResolvConf = locateOrGenerateResolvConf(envInfo)
nodeConfig.AgentConfig.CACertPath = clientCA
nodeConfig.AgentConfig.ListenAddress = "0.0.0.0"
nodeConfig.AgentConfig.KubeConfig = kubeConfig
nodeConfig.AgentConfig.RootDir = filepath.Join(envInfo.DataDir, "kubelet")
nodeConfig.CACerts = info.CACerts
nodeConfig.Containerd.Config = filepath.Join(envInfo.DataDir, "etc/containerd/config.toml")
nodeConfig.Containerd.Root = filepath.Join(envInfo.DataDir, "containerd")
nodeConfig.Containerd.Opt = filepath.Join(envInfo.DataDir, "containerd")
if !envInfo.Debug {
nodeConfig.Containerd.Log = filepath.Join(envInfo.DataDir, "containerd/containerd.log")
}
nodeConfig.Containerd.State = "/run/k3s/containerd"
nodeConfig.Containerd.Address = filepath.Join(nodeConfig.Containerd.State, "containerd.sock")
nodeConfig.Containerd.Template = filepath.Join(envInfo.DataDir, "etc/containerd/config.toml.tmpl")
nodeConfig.ServerAddress = serverURLParsed.Host
nodeConfig.Certificate = nodeCert
if !nodeConfig.NoFlannel {
nodeConfig.FlannelConf = filepath.Join(envInfo.DataDir, "etc/flannel/net-conf.json")
nodeConfig.AgentConfig.CNIBinDir = filepath.Dir(hostLocal)
nodeConfig.AgentConfig.CNIConfDir = filepath.Join(envInfo.DataDir, "etc/cni/net.d")
}
if !nodeConfig.Docker && nodeConfig.ContainerRuntimeEndpoint == "" {
nodeConfig.AgentConfig.RuntimeSocket = "unix://" + nodeConfig.Containerd.Address
} else {
nodeConfig.AgentConfig.RuntimeSocket = "unix://" + nodeConfig.ContainerRuntimeEndpoint
}
if controlConfig.ClusterIPRange != nil {
nodeConfig.AgentConfig.ClusterCIDR = *controlConfig.ClusterIPRange
}
os.Setenv("NODE_NAME", nodeConfig.AgentConfig.NodeName)
v1beta1.KubeletSocket = filepath.Join(envInfo.DataDir, "kubelet/device-plugins/kubelet.sock")
nodeConfig.AgentConfig.ExtraKubeletArgs = envInfo.ExtraKubeletArgs
nodeConfig.AgentConfig.ExtraKubeProxyArgs = envInfo.ExtraKubeProxyArgs
return nodeConfig, nil
}
func getConfig(info *clientaccess.Info) (*config.Control, error) {
data, err := clientaccess.Get("/v1-k3s/config", info)
if err != nil {
return nil, err
}
controlControl := &config.Control{}
return controlControl, json.Unmarshal(data, controlControl)
}
func hostnameCheck(hostname string) {
for {
_, err := sysnet.LookupHost(hostname)
if err == nil {
break
}
logrus.Infof("Waiting for hostname %s to be resolvable: %v", hostname, err)
time.Sleep(2 * time.Second)
}
}