github下载源码:https://github.com/kubernetes/kubernetes
到release下载想到的版本源码,这里我下载v1.16.3
备注:一定要下载tar.gz版本
解压并修改源代码
tar -xzvf v1.16.2.tar.gz
修改根目录下 cert.go文件
vim ./staging/src/k8s.io/client-go/util/cert/cert.go
# 这个方法里面NotAfter: now.Add(duration365d * 10).UTC()
# 默认有效期就是10年,改成100年
func NewSelfSignedCACert(cfg Config, key crypto.Signer) (*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(),
NotAfter: now.Add(duration365d * 100).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)
vim cmd/kubeadm/app/util/pkiutil/pki_helpers.go
# 这个方法里面看到NotAfter: time.Now().Add(kubeadmconstants.CertificateValidity).UTC()
# 参数里面是一个常量kubeadmconstants.CertificateValidity
# 所以这里可以不修改,我去看看源码能不能找到这个常量的赋值位置
func NewSignedCert(cfg *certutil.Config, key crypto.Signer, caCert *x509.Certificate, caKey crypto.Signer) (*x509.Certificate, error) { serial, err := cryptorand.Int(cryptorand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
return nil, err
}
if len(cfg.CommonName) == 0 {
return nil, errors.New("must specify a CommonName")
}
if len(cfg.Usages) == 0 {
return nil, errors.New("must specify at least one ExtKeyUsage")
}
certTmpl := x509.Certificate{
Subject: pkix.Name{
CommonName: cfg.CommonName,
Organization: cfg.Organization,
},
DNSNames: cfg.AltNames.DNSNames,
IPAddresses: cfg.AltNames.IPs,
SerialNumber: serial,
NotBefore: caCert.NotBefore,
NotAfter: time.Now().Add(kubeadmconstants.CertificateValidity).UTC(),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: cfg.Usages,
}
certDERBytes, err := x509.CreateCertificate(cryptorand.Reader, &certTmpl, caCert, key.Public(), caKey)
if err != nil {
return nil, err
}
return x509.ParseCertificate(certDERBytes)
}
结果在这里找到kubeadmconstants.CertificateValidity的定义
vim ./cmd/kubeadm/app/constants/constants.go // 就是这个常量定义CertificateValidity,我改成*100年 const ( // KubernetesDir is the directory Kubernetes owns for storing various configuration files KubernetesDir = "/etc/kubernetes" // ManifestsSubDirName defines directory name to store manifests ManifestsSubDirName = "manifests" // TempDirForKubeadm defines temporary directory for kubeadm // should be joined with KubernetesDir. TempDirForKubeadm = "tmp" // CertificateValidity defines the validity for all the signed certificates generated by kubeadm // CertificateValidity = time.Hour * 24 * 365 CertificateValidity = time.Hour * 24 * 365 * 100 // CACertAndKeyBaseName defines certificate authority base name CACertAndKeyBaseName = "ca" // CACertName defines certificate name CACertName = "ca.crt" // CAKeyName defines certificate name CAKeyName = "ca.key"
源代码改好了,接下来就是编译kubeadm了
二、编译kubeadm
刚开始尝试服务器安装go环境,执行make方法编译,结果各种报错。只能尝试下载容器,在容器里面编译,通过网上找资料,发现官网原来有提供一个k8s.gcr.io/kube-cross的容器用于对代码做编译。
由于我不能翻墙,如果不能翻墙的用户,到https://hub.docker.com搜索 kube-cross关键字,我找了一个版本比较新的mirrorgooglecontainers/kube-cross:v1.12.10-1镜像,v1.12.10-1应该就是镜像里面go环境的版本。
注:在使用mirrorgooglecontainers/kube-cross:v1.12.10-1编译之前,我试过下载一个go版本是v.1.11.x的镜像,编译会报错,大概意思是我下载的kubernetes源码必须用v1.12.x才能编译。
拉取镜像
docker pull mirrorgooglecontainers/kube-cross:v1.12.10-1
# 运行容器,并进入到容器内部 docker run --rm -it -v 你修改源码后的kubernetes根目录:/go/src/k8s.io/kubernetes \ mirrorgooglecontainers/kube-cross:v1.12.10-1 bash # cd到容器内部的挂载路径,可以ls -al查看一下里面的文件是不是主机挂载目录的源码文件 cd /go/src/k8s.io/kubernetes # 编译kubeadm, 这里主要编译kubeadm 即可 make all WHAT=cmd/kubeadm GOFLAGS=-v # 编译kubelet # make all WHAT=cmd/kubelet GOFLAGS=-v # 编译kubectl # make all WHAT=cmd/kubectl GOFLAGS=-v #编译完产物在 _output/bin/kubeadm 目录下, #其中bin是使用了软连接
编译成功后,可以退出容器,能看到挂载路径中已经有编译好的kubeadm
路径./_output/local/bin/linux/amd64/kubeadm
三、替换掉正在使用的kubeadm
# 将kubeadm 文件拷贝替换系统中原有kubeadm cp /usr/bin/kubeadm /usr/bin/kubeadm.bak cp _output/local/bin/linux/amd64/kubeadm /usr/bin/kubeadm
四、执行命令更新证书
可以先备份证书,证书在/etc/kubernetes/pki,我这里就不备份了
1、检查证书到期时间
kubeadm alpha certs check-expiration
2、续订证书,查看可以使用的参数
kubeadm alpha certs renew all
kubeadm alpha certs check-expiration
原文:https://blog.csdn.net/fuck487/article/details/102759523