mirror of https://github.com/k3s-io/k3s
526 lines
17 KiB
Go
526 lines
17 KiB
Go
package config
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import (
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"bufio"
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"context"
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cryptorand "crypto/rand"
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"crypto/tls"
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"encoding/hex"
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"encoding/pem"
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"fmt"
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"io/ioutil"
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sysnet "net"
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"net/http"
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"net/url"
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"os"
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"os/exec"
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"path/filepath"
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"regexp"
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"strings"
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"time"
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fuseoverlayfs "github.com/AkihiroSuda/containerd-fuse-overlayfs"
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"github.com/containerd/containerd/snapshots/overlay"
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"github.com/pkg/errors"
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"github.com/rancher/k3s/pkg/agent/proxy"
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"github.com/rancher/k3s/pkg/cli/cmds"
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"github.com/rancher/k3s/pkg/clientaccess"
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"github.com/rancher/k3s/pkg/daemons/config"
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"github.com/rancher/k3s/pkg/daemons/control"
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"github.com/rancher/k3s/pkg/version"
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"github.com/sirupsen/logrus"
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"k8s.io/apimachinery/pkg/util/json"
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"k8s.io/apimachinery/pkg/util/net"
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)
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const (
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DefaultPodManifestPath = "pod-manifests"
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)
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func Get(ctx context.Context, agent cmds.Agent, proxy proxy.Proxy) *config.Node {
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for {
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agentConfig, err := get(&agent, proxy)
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if err != nil {
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logrus.Errorf("Failed to retrieve agent config: %v", err)
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select {
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case <-time.After(5 * time.Second):
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continue
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case <-ctx.Done():
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logrus.Fatalf("Interrupted")
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}
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}
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return agentConfig
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}
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}
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type HTTPRequester func(u string, client *http.Client, username, password string) ([]byte, error)
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func Request(path string, info *clientaccess.Info, requester HTTPRequester) ([]byte, error) {
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u, err := url.Parse(info.BaseURL)
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if err != nil {
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return nil, err
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}
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u.Path = path
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return requester(u.String(), clientaccess.GetHTTPClient(info.CACerts), info.Username, info.Password)
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}
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func getNodeNamedCrt(nodeName, nodeIP, nodePasswordFile string) HTTPRequester {
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return func(u string, client *http.Client, username, password string) ([]byte, error) {
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req, err := http.NewRequest(http.MethodGet, u, nil)
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if err != nil {
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return nil, err
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}
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if username != "" {
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req.SetBasicAuth(username, password)
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}
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req.Header.Set(version.Program+"-Node-Name", nodeName)
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nodePassword, err := ensureNodePassword(nodePasswordFile)
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if err != nil {
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return nil, err
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}
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req.Header.Set(version.Program+"-Node-Password", nodePassword)
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req.Header.Set(version.Program+"-Node-IP", nodeIP)
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resp, err := client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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if resp.StatusCode == http.StatusForbidden {
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return nil, fmt.Errorf("Node password rejected, duplicate hostname or contents of '%s' may not match server node-passwd entry, try enabling a unique node name with the --with-node-id flag", nodePasswordFile)
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}
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if resp.StatusCode != http.StatusOK {
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return nil, fmt.Errorf("%s: %s", u, resp.Status)
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}
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return ioutil.ReadAll(resp.Body)
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}
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}
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func ensureNodeID(nodeIDFile string) (string, error) {
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if _, err := os.Stat(nodeIDFile); err == nil {
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id, err := ioutil.ReadFile(nodeIDFile)
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return strings.TrimSpace(string(id)), err
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}
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id := make([]byte, 4, 4)
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_, err := cryptorand.Read(id)
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if err != nil {
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return "", err
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}
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nodeID := hex.EncodeToString(id)
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return nodeID, ioutil.WriteFile(nodeIDFile, []byte(nodeID+"\n"), 0644)
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}
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func ensureNodePassword(nodePasswordFile string) (string, error) {
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if _, err := os.Stat(nodePasswordFile); err == nil {
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password, err := ioutil.ReadFile(nodePasswordFile)
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return strings.TrimSpace(string(password)), err
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}
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password := make([]byte, 16, 16)
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_, err := cryptorand.Read(password)
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if err != nil {
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return "", err
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}
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nodePassword := hex.EncodeToString(password)
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return nodePassword, ioutil.WriteFile(nodePasswordFile, []byte(nodePassword+"\n"), 0600)
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}
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func upgradeOldNodePasswordPath(oldNodePasswordFile, newNodePasswordFile string) {
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password, err := ioutil.ReadFile(oldNodePasswordFile)
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if err != nil {
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return
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}
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if err := ioutil.WriteFile(newNodePasswordFile, password, 0600); err != nil {
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logrus.Warnf("Unable to write password file: %v", err)
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return
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}
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if err := os.Remove(oldNodePasswordFile); err != nil {
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logrus.Warnf("Unable to remove old password file: %v", err)
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return
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}
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}
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func getServingCert(nodeName, nodeIP, servingCertFile, servingKeyFile, nodePasswordFile string, info *clientaccess.Info) (*tls.Certificate, error) {
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servingCert, err := Request("/v1-"+version.Program+"/serving-kubelet.crt", info, getNodeNamedCrt(nodeName, nodeIP, nodePasswordFile))
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if err != nil {
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return nil, err
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}
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servingCert, servingKey := splitCertKeyPEM(servingCert)
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if err := ioutil.WriteFile(servingCertFile, servingCert, 0600); err != nil {
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return nil, errors.Wrapf(err, "failed to write node cert")
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}
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if err := ioutil.WriteFile(servingKeyFile, servingKey, 0600); err != nil {
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return nil, errors.Wrapf(err, "failed to write node key")
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}
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cert, err := tls.X509KeyPair(servingCert, servingKey)
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if err != nil {
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return nil, err
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}
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return &cert, nil
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}
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func getHostFile(filename, keyFile string, info *clientaccess.Info) error {
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basename := filepath.Base(filename)
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fileBytes, err := clientaccess.Get("/v1-"+version.Program+"/"+basename, info)
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if err != nil {
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return err
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}
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if keyFile == "" {
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if err := ioutil.WriteFile(filename, fileBytes, 0600); err != nil {
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return errors.Wrapf(err, "failed to write cert %s", filename)
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}
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} else {
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fileBytes, keyBytes := splitCertKeyPEM(fileBytes)
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if err := ioutil.WriteFile(filename, fileBytes, 0600); err != nil {
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return errors.Wrapf(err, "failed to write cert %s", filename)
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}
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if err := ioutil.WriteFile(keyFile, keyBytes, 0600); err != nil {
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return errors.Wrapf(err, "failed to write key %s", filename)
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}
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}
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return nil
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}
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func splitCertKeyPEM(bytes []byte) (certPem []byte, keyPem []byte) {
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for {
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b, rest := pem.Decode(bytes)
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if b == nil {
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break
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}
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bytes = rest
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if strings.Contains(b.Type, "PRIVATE KEY") {
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keyPem = append(keyPem, pem.EncodeToMemory(b)...)
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} else {
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certPem = append(certPem, pem.EncodeToMemory(b)...)
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}
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}
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return
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}
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func getNodeNamedHostFile(filename, keyFile, nodeName, nodeIP, nodePasswordFile string, info *clientaccess.Info) error {
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basename := filepath.Base(filename)
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fileBytes, err := Request("/v1-"+version.Program+"/"+basename, info, getNodeNamedCrt(nodeName, nodeIP, nodePasswordFile))
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if err != nil {
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return err
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}
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fileBytes, keyBytes := splitCertKeyPEM(fileBytes)
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if err := ioutil.WriteFile(filename, fileBytes, 0600); err != nil {
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return errors.Wrapf(err, "failed to write cert %s", filename)
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}
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if err := ioutil.WriteFile(keyFile, keyBytes, 0600); err != nil {
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return errors.Wrapf(err, "failed to write key %s", filename)
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}
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return nil
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}
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func getHostnameAndIP(info cmds.Agent) (string, string, error) {
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ip := info.NodeIP
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if ip == "" {
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hostIP, err := net.ChooseHostInterface()
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if err != nil {
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return "", "", err
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}
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ip = hostIP.String()
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}
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name := info.NodeName
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if name == "" {
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hostname, err := os.Hostname()
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if err != nil {
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return "", "", err
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}
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name = hostname
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}
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// Use lower case hostname to comply with kubernetes constraint:
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// https://github.com/kubernetes/kubernetes/issues/71140
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name = strings.ToLower(name)
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return name, ip, nil
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}
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func isValidResolvConf(resolvConfFile string) bool {
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file, err := os.Open(resolvConfFile)
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if err != nil {
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return false
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}
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defer file.Close()
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nameserver := regexp.MustCompile(`^nameserver\s+([^\s]*)`)
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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ipMatch := nameserver.FindStringSubmatch(scanner.Text())
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if len(ipMatch) == 2 {
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ip := sysnet.ParseIP(ipMatch[1])
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if ip == nil || !ip.IsGlobalUnicast() {
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return false
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}
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}
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}
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if err := scanner.Err(); err != nil {
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return false
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}
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return true
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}
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func locateOrGenerateResolvConf(envInfo *cmds.Agent) string {
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if envInfo.ResolvConf != "" {
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return envInfo.ResolvConf
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}
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resolvConfs := []string{"/etc/resolv.conf", "/run/systemd/resolve/resolv.conf"}
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for _, conf := range resolvConfs {
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if isValidResolvConf(conf) {
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return conf
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}
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}
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tmpConf := filepath.Join(os.TempDir(), version.Program+"-resolv.conf")
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if err := ioutil.WriteFile(tmpConf, []byte("nameserver 8.8.8.8\n"), 0444); err != nil {
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logrus.Errorf("Failed to write %s: %v", tmpConf, err)
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return ""
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}
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return tmpConf
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}
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func get(envInfo *cmds.Agent, proxy proxy.Proxy) (*config.Node, error) {
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if envInfo.Debug {
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logrus.SetLevel(logrus.DebugLevel)
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}
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info, err := clientaccess.ParseAndValidateToken(proxy.SupervisorURL(), envInfo.Token)
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if err != nil {
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return nil, err
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}
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controlConfig, err := getConfig(info)
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if err != nil {
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return nil, err
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}
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if controlConfig.SupervisorPort != controlConfig.HTTPSPort {
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if err := proxy.StartAPIServerProxy(controlConfig.HTTPSPort); err != nil {
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return nil, errors.Wrapf(err, "failed to setup access to API Server port %d on at %s", controlConfig.HTTPSPort, proxy.SupervisorURL())
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}
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}
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var flannelIface *sysnet.Interface
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if !envInfo.NoFlannel && len(envInfo.FlannelIface) > 0 {
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flannelIface, err = sysnet.InterfaceByName(envInfo.FlannelIface)
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if err != nil {
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return nil, errors.Wrapf(err, "unable to find interface")
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}
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}
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clientCAFile := filepath.Join(envInfo.DataDir, "agent", "client-ca.crt")
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if err := getHostFile(clientCAFile, "", info); err != nil {
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return nil, err
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}
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serverCAFile := filepath.Join(envInfo.DataDir, "agent", "server-ca.crt")
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if err := getHostFile(serverCAFile, "", info); err != nil {
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return nil, err
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}
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servingKubeletCert := filepath.Join(envInfo.DataDir, "agent", "serving-kubelet.crt")
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servingKubeletKey := filepath.Join(envInfo.DataDir, "agent", "serving-kubelet.key")
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nodePasswordRoot := "/"
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if envInfo.Rootless {
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nodePasswordRoot = filepath.Join(envInfo.DataDir, "agent")
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}
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nodeConfigPath := filepath.Join(nodePasswordRoot, "etc", "rancher", "node")
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if err := os.MkdirAll(nodeConfigPath, 0755); err != nil {
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return nil, err
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}
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oldNodePasswordFile := filepath.Join(envInfo.DataDir, "agent", "node-password.txt")
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newNodePasswordFile := filepath.Join(nodeConfigPath, "password")
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upgradeOldNodePasswordPath(oldNodePasswordFile, newNodePasswordFile)
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nodeName, nodeIP, err := getHostnameAndIP(*envInfo)
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if err != nil {
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return nil, err
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}
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if envInfo.WithNodeID {
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nodeID, err := ensureNodeID(filepath.Join(nodeConfigPath, "id"))
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if err != nil {
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return nil, err
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}
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nodeName += "-" + nodeID
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}
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os.Setenv("NODE_NAME", nodeName)
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servingCert, err := getServingCert(nodeName, nodeIP, servingKubeletCert, servingKubeletKey, newNodePasswordFile, info)
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if err != nil {
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return nil, err
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}
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clientKubeletCert := filepath.Join(envInfo.DataDir, "agent", "client-kubelet.crt")
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clientKubeletKey := filepath.Join(envInfo.DataDir, "agent", "client-kubelet.key")
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if err := getNodeNamedHostFile(clientKubeletCert, clientKubeletKey, nodeName, nodeIP, newNodePasswordFile, info); err != nil {
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return nil, err
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}
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kubeconfigKubelet := filepath.Join(envInfo.DataDir, "agent", "kubelet.kubeconfig")
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if err := control.KubeConfig(kubeconfigKubelet, proxy.APIServerURL(), serverCAFile, clientKubeletCert, clientKubeletKey); err != nil {
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return nil, err
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}
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clientKubeProxyCert := filepath.Join(envInfo.DataDir, "agent", "client-kube-proxy.crt")
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clientKubeProxyKey := filepath.Join(envInfo.DataDir, "agent", "client-kube-proxy.key")
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if err := getHostFile(clientKubeProxyCert, clientKubeProxyKey, info); err != nil {
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return nil, err
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}
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kubeconfigKubeproxy := filepath.Join(envInfo.DataDir, "agent", "kubeproxy.kubeconfig")
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if err := control.KubeConfig(kubeconfigKubeproxy, proxy.APIServerURL(), serverCAFile, clientKubeProxyCert, clientKubeProxyKey); err != nil {
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return nil, err
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}
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clientK3sControllerCert := filepath.Join(envInfo.DataDir, "agent", "client-"+version.Program+"-controller.crt")
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clientK3sControllerKey := filepath.Join(envInfo.DataDir, "agent", "client-"+version.Program+"-controller.key")
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if err := getHostFile(clientK3sControllerCert, clientK3sControllerKey, info); err != nil {
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return nil, err
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}
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kubeconfigK3sController := filepath.Join(envInfo.DataDir, "agent", version.Program+"controller.kubeconfig")
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if err := control.KubeConfig(kubeconfigK3sController, proxy.APIServerURL(), serverCAFile, clientK3sControllerCert, clientK3sControllerKey); err != nil {
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return nil, err
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}
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nodeConfig := &config.Node{
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Docker: envInfo.Docker,
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SELinux: envInfo.EnableSELinux,
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ContainerRuntimeEndpoint: envInfo.ContainerRuntimeEndpoint,
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FlannelBackend: controlConfig.FlannelBackend,
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ServerHTTPSPort: controlConfig.HTTPSPort,
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}
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nodeConfig.FlannelIface = flannelIface
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nodeConfig.Images = filepath.Join(envInfo.DataDir, "agent", "images")
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nodeConfig.AgentConfig.NodeIP = nodeIP
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nodeConfig.AgentConfig.NodeName = nodeName
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nodeConfig.AgentConfig.NodeConfigPath = nodeConfigPath
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nodeConfig.AgentConfig.NodeExternalIP = envInfo.NodeExternalIP
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nodeConfig.AgentConfig.ServingKubeletCert = servingKubeletCert
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nodeConfig.AgentConfig.ServingKubeletKey = servingKubeletKey
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nodeConfig.AgentConfig.ClusterDNS = controlConfig.ClusterDNS
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nodeConfig.AgentConfig.ClusterDomain = controlConfig.ClusterDomain
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nodeConfig.AgentConfig.ResolvConf = locateOrGenerateResolvConf(envInfo)
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nodeConfig.AgentConfig.ClientCA = clientCAFile
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nodeConfig.AgentConfig.ListenAddress = "0.0.0.0"
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nodeConfig.AgentConfig.KubeConfigKubelet = kubeconfigKubelet
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nodeConfig.AgentConfig.KubeConfigKubeProxy = kubeconfigKubeproxy
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nodeConfig.AgentConfig.KubeConfigK3sController = kubeconfigK3sController
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if envInfo.Rootless {
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nodeConfig.AgentConfig.RootDir = filepath.Join(envInfo.DataDir, "agent", "kubelet")
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}
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nodeConfig.AgentConfig.PauseImage = envInfo.PauseImage
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nodeConfig.AgentConfig.Snapshotter = envInfo.Snapshotter
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nodeConfig.AgentConfig.IPSECPSK = controlConfig.IPSECPSK
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nodeConfig.AgentConfig.StrongSwanDir = filepath.Join(envInfo.DataDir, "agent", "strongswan")
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nodeConfig.CACerts = info.CACerts
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nodeConfig.Containerd.Config = filepath.Join(envInfo.DataDir, "agent", "etc", "containerd", "config.toml")
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nodeConfig.Containerd.Root = filepath.Join(envInfo.DataDir, "agent", "containerd")
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if !nodeConfig.Docker && nodeConfig.ContainerRuntimeEndpoint == "" {
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switch nodeConfig.AgentConfig.Snapshotter {
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case "overlayfs":
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if err := overlay.Supported(nodeConfig.Containerd.Root); err != nil {
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return nil, errors.Wrapf(err, "\"overlayfs\" snapshotter cannot be enabled for %q, try using \"fuse-overlayfs\" or \"native\"",
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nodeConfig.Containerd.Root)
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}
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case "fuse-overlayfs":
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if err := fuseoverlayfs.Supported(nodeConfig.Containerd.Root); err != nil {
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return nil, errors.Wrapf(err, "\"fuse-overlayfs\" snapshotter cannot be enabled for %q, try using \"native\"",
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nodeConfig.Containerd.Root)
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}
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}
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}
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nodeConfig.Containerd.Opt = filepath.Join(envInfo.DataDir, "agent", "containerd")
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if !envInfo.Debug {
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nodeConfig.Containerd.Log = filepath.Join(envInfo.DataDir, "agent", "containerd", "containerd.log")
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}
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nodeConfig.Containerd.State = "/run/k3s/containerd"
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nodeConfig.Containerd.Address = filepath.Join(nodeConfig.Containerd.State, "containerd.sock")
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nodeConfig.Containerd.Template = filepath.Join(envInfo.DataDir, "agent", "etc", "containerd", "config.toml.tmpl")
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nodeConfig.Certificate = servingCert
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if nodeConfig.FlannelBackend == config.FlannelBackendNone {
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nodeConfig.NoFlannel = true
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} else {
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nodeConfig.NoFlannel = envInfo.NoFlannel
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}
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|
if !nodeConfig.NoFlannel {
|
|
hostLocal, err := exec.LookPath("host-local")
|
|
if err != nil {
|
|
return nil, errors.Wrapf(err, "failed to find host-local")
|
|
}
|
|
|
|
if envInfo.FlannelConf == "" {
|
|
nodeConfig.FlannelConf = filepath.Join(envInfo.DataDir, "agent", "etc", "flannel", "net-conf.json")
|
|
} else {
|
|
nodeConfig.FlannelConf = envInfo.FlannelConf
|
|
nodeConfig.FlannelConfOverride = true
|
|
}
|
|
nodeConfig.AgentConfig.CNIBinDir = filepath.Dir(hostLocal)
|
|
nodeConfig.AgentConfig.CNIConfDir = filepath.Join(envInfo.DataDir, "agent", "etc", "cni", "net.d")
|
|
}
|
|
|
|
if !nodeConfig.Docker && nodeConfig.ContainerRuntimeEndpoint == "" {
|
|
nodeConfig.AgentConfig.RuntimeSocket = nodeConfig.Containerd.Address
|
|
} else {
|
|
nodeConfig.AgentConfig.RuntimeSocket = nodeConfig.ContainerRuntimeEndpoint
|
|
nodeConfig.AgentConfig.CNIPlugin = true
|
|
}
|
|
|
|
if controlConfig.ClusterIPRange != nil {
|
|
nodeConfig.AgentConfig.ClusterCIDR = *controlConfig.ClusterIPRange
|
|
}
|
|
|
|
if controlConfig.ServiceIPRange != nil {
|
|
nodeConfig.AgentConfig.ServiceCIDR = *controlConfig.ServiceIPRange
|
|
}
|
|
|
|
if controlConfig.ServiceNodePortRange != nil {
|
|
nodeConfig.AgentConfig.ServiceNodePortRange = *controlConfig.ServiceNodePortRange
|
|
}
|
|
|
|
nodeConfig.AgentConfig.ExtraKubeletArgs = envInfo.ExtraKubeletArgs
|
|
nodeConfig.AgentConfig.ExtraKubeProxyArgs = envInfo.ExtraKubeProxyArgs
|
|
|
|
nodeConfig.AgentConfig.NodeTaints = envInfo.Taints
|
|
nodeConfig.AgentConfig.NodeLabels = envInfo.Labels
|
|
nodeConfig.AgentConfig.PrivateRegistry = envInfo.PrivateRegistry
|
|
nodeConfig.AgentConfig.DisableCCM = controlConfig.DisableCCM
|
|
nodeConfig.AgentConfig.DisableNPC = controlConfig.DisableNPC
|
|
nodeConfig.AgentConfig.DisableKubeProxy = controlConfig.DisableKubeProxy
|
|
nodeConfig.AgentConfig.Rootless = envInfo.Rootless
|
|
nodeConfig.AgentConfig.PodManifests = filepath.Join(envInfo.DataDir, "agent", DefaultPodManifestPath)
|
|
nodeConfig.AgentConfig.ProtectKernelDefaults = envInfo.ProtectKernelDefaults
|
|
|
|
return nodeConfig, nil
|
|
}
|
|
|
|
func getConfig(info *clientaccess.Info) (*config.Control, error) {
|
|
data, err := clientaccess.Get("/v1-"+version.Program+"/config", info)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
controlControl := &config.Control{}
|
|
return controlControl, json.Unmarshal(data, controlControl)
|
|
}
|