kubeadm源码分析
说句实在话，kubeadm的代码写的真心一般，质量不是很高。
几个关键点来先说一下kubeadm干的几个核心的事：
- kubeadm 生成证书在/etc/kubernetes/pki目录下
- kubeadm 生成static pod yaml配置，全部在/etc/kubernetes/manifasts下
- kubeadm 生成kubelet配置，kubectl配置等 在/etc/kubernetes下
- kubeadm 通过client go去启动dns
kubeadm init
代码入口 cmd/kubeadm/app/cmd/init.go 建议大家去 看看cobra
找到Run函数来分析下主要流程：
如果证书不存在，就创建证书，所以如果我们有自己的证书可以把它放在/etc/kubernetes/pki下即可, 下文细看如果生成证书
if res, _ := certsphase.UsingExternalCA(i.cfg); !res {
if err := certsphase.CreatePKIAssets(i.cfg); err != nil {
return err
}
创建kubeconfig文件
if err := kubeconfigphase.CreateInitKubeConfigFiles(kubeConfigDir, i.cfg); err != nil {
return err
}
创建manifest文件，etcd apiserver manager scheduler都在这里创建, 可以看到如果你的配置文件里已经写了etcd的地址了，就不创建了，这我们就可以自己装etcd集群，而不用默认单点的etcd，很有用
controlplanephase.CreateInitStaticPodManifestFiles(manifestDir, i.cfg);
if len(i.cfg.Etcd.Endpoints) == 0 {
if err := etcdphase.CreateLocalEtcdStaticPodManifestFile(manifestDir, i.cfg); err != nil {
return fmt.Errorf("error creating local etcd static pod manifest file: %v", err)
}
}
等待APIserver和kubelet启动成功，这里就会遇到我们经常遇到的镜像拉不下来的错误，其实有时kubelet因为别的原因也会报这个错，让人误以为是镜像弄不下来
if err := waitForAPIAndKubelet(waiter); err != nil {
ctx := map[string]string{
"Error": fmt.Sprintf("%v", err),
"APIServerImage": images.GetCoreImage(kubeadmconstants.KubeAPIServer, i.cfg.GetControlPlaneImageRepository(), i.cfg.KubernetesVersion, i.cfg.UnifiedControlPlaneImage),
"ControllerManagerImage": images.GetCoreImage(kubeadmconstants.KubeControllerManager, i.cfg.GetControlPlaneImageRepository(), i.cfg.KubernetesVersion, i.cfg.UnifiedControlPlaneImage),
"SchedulerImage": images.GetCoreImage(kubeadmconstants.KubeScheduler, i.cfg.GetControlPlaneImageRepository(), i.cfg.KubernetesVersion, i.cfg.UnifiedControlPlaneImage),
}
kubeletFailTempl.Execute(out, ctx)
return fmt.Errorf("couldn't initialize a Kubernetes cluster")
}
给master加标签，加污点, 所以想要pod调度到master上可以把污点清除了
if err := markmasterphase.MarkMaster(client, i.cfg.NodeName); err != nil {
return fmt.Errorf("error marking master: %v", err)
}
生成tocken
if err := nodebootstraptokenphase.UpdateOrCreateToken(client, i.cfg.Token, false, i.cfg.TokenTTL.Duration, kubeadmconstants.DefaultTokenUsages, []string{kubeadmconstants.NodeBootstrapTokenAuthGroup}, tokenDescription); err != nil {
return fmt.Errorf("error updating or creating token: %v", err)
}
调用clientgo创建dns和kube-proxy
if err := dnsaddonphase.EnsureDNSAddon(i.cfg, client); err != nil {
return fmt.Errorf("error ensuring dns addon: %v", err)
}
if err := proxyaddonphase.EnsureProxyAddon(i.cfg, client); err != nil {
return fmt.Errorf("error ensuring proxy addon: %v", err)
}
笔者批判代码无脑式的一个流程到底，要是笔者操刀定抽象成接口 RenderConf Save Run Clean等，DNS kube-porxy以及其它组件去实现，然后问题就是没把dns和kubeproxy的配置渲染出来，可能是它们不是static pod的原因, 然后就是join时的bug下文提到
证书生成
循环的调用了这一坨函数，我们只需要看其中一两个即可，其它的都差不多
certActions := []func(cfg *kubeadmapi.MasterConfiguration) error{
CreateCACertAndKeyfiles,
CreateAPIServerCertAndKeyFiles,
CreateAPIServerKubeletClientCertAndKeyFiles,
CreateServiceAccountKeyAndPublicKeyFiles,
CreateFrontProxyCACertAndKeyFiles,
CreateFrontProxyClientCertAndKeyFiles,
}
根证书生成：
//返回了根证书的公钥和私钥 func NewCACertAndKey() (*x509.Certificate, *rsa.PrivateKey, error) {
caCert, caKey, err := pkiutil.NewCertificateAuthority()
if err != nil {
return nil, nil, fmt.Errorf("failure while generating CA certificate and key: %v", err)
}
return caCert, caKey, nil
}
k8s.io/client-go/util/cert 这个库里面有两个函数，一个生成key的一个生成cert的：
key, err := certutil.NewPrivateKey()
config := certutil.Config{
CommonName: "kubernetes",
}
cert, err := certutil.NewSelfSignedCACert(config, key)
config里面我们也可以填充一些别的证书信息：
type Config struct {
CommonName string Organization []string AltNames AltNames Usages []x509.ExtKeyUsage
}
私钥就是封装了rsa库里面的函数：
"crypto/rsa" "crypto/x509" func NewPrivateKey() (*rsa.PrivateKey, error) {
return rsa.GenerateKey(cryptorand.Reader, rsaKeySize)
}
自签证书,所以根证书里只有CommonName信息，Organization相当于没设置：
func NewSelfSignedCACert(cfg Config, key *rsa.PrivateKey) (*x509.Certificate, error) {
now := time.Now()
tmpl := x509.Certificate{
SerialNumber: new(big.Int).SetInt64(0),
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: cfg.Organization,
},
NotBefore: now.UTC(),
NotAfter: now.Add(duration365d * 10).UTC(),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
BasicConstraintsValid: true,
IsCA: true,
}
certDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &tmpl, &tmpl, key.Public(), key)
if err != nil {
return nil, err
}
return x509.ParseCertificate(certDERBytes)
}
生成好之后把之写入文件：
pkiutil.WriteCertAndKey(pkiDir, baseName, cert, key);
certutil.WriteCert(certificatePath, certutil.EncodeCertPEM(cert))
这里调用了pem库进行了编码
encoding/pem
func EncodeCertPEM(cert *x509.Certificate) []byte {
block := pem.Block{
Type: CertificateBlockType,
Bytes: cert.Raw,
}
return pem.EncodeToMemory(&block)
}
然后我们看apiserver的证书生成：
caCert, caKey, err := loadCertificateAuthorithy(cfg.CertificatesDir, kubeadmconstants.CACertAndKeyBaseName)
//从根证书生成apiserver证书
apiCert, apiKey, err := NewAPIServerCertAndKey(cfg, caCert, caKey)
这时需要关注AltNames了比较重要，所有需要访问master的地址域名都得加进去，对应配置文件中apiServerCertSANs字段,其它东西与根证书无差别
config := certutil.Config{ CommonName: kubeadmconstants.APIServerCertCommonName, AltNames: *altNames, Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, }
创建k8s配置文件
可以看到创建了这些文件
return createKubeConfigFiles(
outDir,
cfg,
kubeadmconstants.AdminKubeConfigFileName,
kubeadmconstants.KubeletKubeConfigFileName,
kubeadmconstants.ControllerManagerKubeConfigFileName,
kubeadmconstants.SchedulerKubeConfigFileName,
)
k8s封装了两个渲染配置的函数：
区别是你的kubeconfig文件里会不会产生token，比如你进入dashboard需要一个token，或者你调用api需要一个token那么请生成带token的配置
生成的conf文件基本一直只是比如ClientName这些东西不同，所以加密后的证书也不同，ClientName会被加密到证书里，然后k8s取出来当用户使用
所以重点来了，我们做多租户时也要这样去生成。然后给该租户绑定角色。
return kubeconfigutil.CreateWithToken(
spec.APIServer,
"kubernetes",
spec.ClientName,
certutil.EncodeCertPEM(spec.CACert),
spec.TokenAuth.Token,
), nil return kubeconfigutil.CreateWithCerts(
spec.APIServer,
"kubernetes",
spec.ClientName,
certutil.EncodeCertPEM(spec.CACert),
certutil.EncodePrivateKeyPEM(clientKey),
certutil.EncodeCertPEM(clientCert),
), nil
然后就是填充Config结构体喽, 最后写到文件里，略
"k8s.io/client-go/tools/clientcmd/api return &clientcmdapi.Config{ Clusters: map[string]*clientcmdapi.Cluster{ clusterName: { Server: serverURL, CertificateAuthorityData: caCert, }, }, Contexts: map[string]*clientcmdapi.Context{ contextName: { Cluster: clusterName, AuthInfo: userName, }, }, AuthInfos: map[string]*clientcmdapi.AuthInfo{}, CurrentContext: contextName, }
创建static pod yaml文件
这里返回了apiserver manager scheduler的pod结构体,
specs := GetStaticPodSpecs(cfg, k8sVersion)
staticPodSpecs := map[string]v1.Pod{
kubeadmconstants.KubeAPIServer: staticpodutil.ComponentPod(v1.Container{
Name: kubeadmconstants.KubeAPIServer,
Image: images.GetCoreImage(kubeadmconstants.KubeAPIServer, cfg.GetControlPlaneImageRepository(), cfg.KubernetesVersion, cfg.UnifiedControlPlaneImage),
Command: getAPIServerCommand(cfg, k8sVersion),
VolumeMounts: staticpodutil.VolumeMountMapToSlice(mounts.GetVolumeMounts(kubeadmconstants.KubeAPIServer)),
LivenessProbe: staticpodutil.ComponentProbe(cfg, kubeadmconstants.KubeAPIServer, int(cfg.API.BindPort), "/healthz", v1.URISchemeHTTPS),
Resources: staticpodutil.ComponentResources("250m"),
Env: getProxyEnvVars(),
}, mounts.GetVolumes(kubeadmconstants.KubeAPIServer)),
kubeadmconstants.KubeControllerManager: staticpodutil.ComponentPod(v1.Container{
Name: kubeadmconstants.KubeControllerManager,
Image: images.GetCoreImage(kubeadmconstants.KubeControllerManager, cfg.GetControlPlaneImageRepository(), cfg.KubernetesVersion, cfg.UnifiedControlPlaneImage),
Command: getControllerManagerCommand(cfg, k8sVersion),
VolumeMounts: staticpodutil.VolumeMountMapToSlice(mounts.GetVolumeMounts(kubeadmconstants.KubeControllerManager)),
LivenessProbe: staticpodutil.ComponentProbe(cfg, kubeadmconstants.KubeControllerManager, 10252, "/healthz", v1.URISchemeHTTP),
Resources: staticpodutil.ComponentResources("200m"),
Env: getProxyEnvVars(),
}, mounts.GetVolumes(kubeadmconstants.KubeControllerManager)),
kubeadmconstants.KubeScheduler: staticpodutil.ComponentPod(v1.Container{
Name: kubeadmconstants.KubeScheduler,
Image: images.GetCoreImage(kubeadmconstants.KubeScheduler, cfg.GetControlPlaneImageRepository(), cfg.KubernetesVersion, cfg.UnifiedControlPlaneImage),
Command: getSchedulerCommand(cfg),
VolumeMounts: staticpodutil.VolumeMountMapToSlice(mounts.GetVolumeMounts(kubeadmconstants.KubeScheduler)),
LivenessProbe: staticpodutil.ComponentProbe(cfg, kubeadmconstants.KubeScheduler, 10251, "/healthz", v1.URISchemeHTTP),
Resources: staticpodutil.ComponentResources("100m"),
Env: getProxyEnvVars(),
}, mounts.GetVolumes(kubeadmconstants.KubeScheduler)),
}
//获取特定版本的镜像
func GetCoreImage(image, repoPrefix, k8sVersion, overrideImage string) string {
if overrideImage != "" {
return overrideImage
}
kubernetesImageTag := kubeadmutil.KubernetesVersionToImageTag(k8sVersion)
etcdImageTag := constants.DefaultEtcdVersion
etcdImageVersion, err := constants.EtcdSupportedVersion(k8sVersion)
if err == nil {
etcdImageTag = etcdImageVersion.String()
}
return map[string]string{
constants.Etcd: fmt.Sprintf("%s/%s-%s:%s", repoPrefix, "etcd", runtime.GOARCH, etcdImageTag),
constants.KubeAPIServer: fmt.Sprintf("%s/%s-%s:%s", repoPrefix, "kube-apiserver", runtime.GOARCH, kubernetesImageTag),
constants.KubeControllerManager: fmt.Sprintf("%s/%s-%s:%s", repoPrefix, "kube-controller-manager", runtime.GOARCH, kubernetesImageTag),
constants.KubeScheduler: fmt.Sprintf("%s/%s-%s:%s", repoPrefix, "kube-scheduler", runtime.GOARCH, kubernetesImageTag),
}[image]
}
//然后就把这个pod写到文件里了，比较简单
staticpodutil.WriteStaticPodToDisk(componentName, manifestDir, spec);
创建etcd的一样，不多废话
等待kubelet启动成功
这个错误非常容易遇到，看到这个基本就是kubelet没起来，我们需要检查：selinux swap 和Cgroup driver是不是一致
setenforce 0 && swapoff -a && systemctl restart kubelet如果不行请保证 kubelet的Cgroup driver与docker一致，docker info|grep Cg
go func(errC chan error, waiter apiclient.Waiter) {
// This goroutine can only make kubeadm init fail. If this check succeeds, it won't do anything special if err := waiter.WaitForHealthyKubelet(40*time.Second, "http://localhost:10255/healthz"); err != nil {
errC <- err
}
}(errorChan, waiter)
go func(errC chan error, waiter apiclient.Waiter) {
// This goroutine can only make kubeadm init fail. If this check succeeds, it won't do anything special if err := waiter.WaitForHealthyKubelet(60*time.Second, "http://localhost:10255/healthz/syncloop"); err != nil {
errC <- err
}
}(errorChan, waiter)
创建DNS和kubeproxy
我就是在此发现coreDNS的
if features.Enabled(cfg.FeatureGates, features.CoreDNS) {
return coreDNSAddon(cfg, client, k8sVersion)
}
return kubeDNSAddon(cfg, client, k8sVersion)
然后coreDNS的yaml配置模板直接是写在代码里的：
/app/phases/addons/dns/manifests.go
CoreDNSDeployment = ` apiVersion: apps/v1beta2 kind: Deployment metadata: name: coredns namespace: kube-system labels: k8s-app: kube-dns spec: replicas: 1 selector: matchLabels: k8s-app: kube-dns template: metadata: labels: k8s-app: kube-dns spec: serviceAccountName: coredns tolerations: - key: CriticalAddonsOnly operator: Exists - key: {{ .MasterTaintKey }} ...
然后渲染模板，最后调用k8sapi创建,这种创建方式可以学习一下，虽然有点拙劣，这地方写的远不如kubectl好
coreDNSConfigMap := &v1.ConfigMap{}
if err := kuberuntime.DecodeInto(legacyscheme.Codecs.UniversalDecoder(), configBytes, coreDNSConfigMap); err != nil {
return fmt.Errorf("unable to decode CoreDNS configmap %v", err)
}
// Create the ConfigMap for CoreDNS or update it in case it already exists if err := apiclient.CreateOrUpdateConfigMap(client, coreDNSConfigMap); err != nil {
return err
}
coreDNSClusterRoles := &rbac.ClusterRole{}
if err := kuberuntime.DecodeInto(legacyscheme.Codecs.UniversalDecoder(), []byte(CoreDNSClusterRole), coreDNSClusterRoles); err != nil {
return fmt.Errorf("unable to decode CoreDNS clusterroles %v", err)
}
...
这里值得一提的是kubeproxy的configmap真应该把apiserver地址传入进来，允许自定义，因为做高可用时需要指定虚拟ip，得修改，很麻烦
kubeproxy大差不差，不说了,想改的话改： app/phases/addons/proxy/manifests.go
kubeadm join
kubeadm join比较简单，一句话就可以说清楚，获取cluster info, 创建kubeconfig，怎么创建的kubeinit里面已经说了。带上token让kubeadm有权限
可以拉取
return https.RetrieveValidatedClusterInfo(cfg.DiscoveryFile)
cluster info内容
type Cluster struct {
// LocationOfOrigin indicates where this object came from. It is used for round tripping config post-merge, but never serialized.
LocationOfOrigin string // Server is the address of the kubernetes cluster (https://hostname:port).
Server string `json:"server"` // InsecureSkipTLSVerify skips the validity check for the server's certificate. This will make your HTTPS connections insecure. // +optional
InsecureSkipTLSVerify bool `json:"insecure-skip-tls-verify,omitempty"` // CertificateAuthority is the path to a cert file for the certificate authority. // +optional
CertificateAuthority string `json:"certificate-authority,omitempty"` // CertificateAuthorityData contains PEM-encoded certificate authority certificates. Overrides CertificateAuthority // +optional
CertificateAuthorityData []byte `json:"certificate-authority-data,omitempty"` // Extensions holds additional information. This is useful for extenders so that reads and writes don't clobber unknown fields // +optional
Extensions map[string]runtime.Object `json:"extensions,omitempty"`
}
return kubeconfigutil.CreateWithToken(
clusterinfo.Server,
"kubernetes",
TokenUser,
clusterinfo.CertificateAuthorityData,
cfg.TLSBootstrapToken,
), nil
CreateWithToken上文提到了不再赘述，这样就能去生成kubelet配置文件了，然后把kubelet启动起来即可
kubeadm join的问题就是渲染配置时没有使用命令行传入的apiserver地址，而用clusterinfo里的地址，这不利于我们做高可用，可能我们传入一个虚拟ip，但是配置里还是apiser的地址
本文转自SegmentFault-kubeadm源码分析（kubernetes离线安装包，三步安装）
