kubeadm-certs

kubeadm-certs 只将 kubeadm 的证书有效期设置为10年，未对源码做任何其他修改。编译脚本见 .build.yml , CI 见

go 版本

编译最低版本源文件

v1.15.12 go1.12.1
v1.16.15 go1.13.4
v1.17.12 go1.13.4
v1.18.9  go1.13.4
v1.19.3  go1.15.0
v1.20.0  go1.15.0
v1.21.0  go1.16.0
v1.22.0  go1.16.0
v1.23.0  go1.17.0
v1.24.0  go1.18.1
v1.25.0  go1.19
v1.26.0  go1.19
v1.27.0  go1.20
v1.28.0  go1.20
v1.29.0  go1.21
v1.30.0  go1.22

证书有效期文件

CA 证书

• https://github.com/kubernetes/kubernetes/blob/v1.30.0/staging/src/k8s.io/client-go/util/cert/cert.go#L79-L80

签发证书

• https://github.com/kubernetes/kubernetes/blob/v1.30.0/cmd/kubeadm/app/constants/constants.go#L48
• https://github.com/kubernetes/kubernetes/blob/v1.30.0/cmd/kubeadm/app/util/pkiutil/pki_helpers.go#L658

使用

项目release版本与kubernetes发布版本一致，可以在 releases 页面直接查看

[ -f /usr/bin/kubeadm ] && mv /usr/bin/kubeadm{,_src}
wget https://github.com/lework/kubeadm-certs/releases/download/v1.21.0/kubeadm-linux-amd64 -O /usr/bin/kubeadm
chmod +x /usr/bin/kubeadm

版本信息差异

# 文件大小差异
$ls -al /usr/bin/kubeadm*
-rwxr-xr-x 1 root root 44613632 4月  12 17:30 /usr/bin/kubeadm
-rwxr-xr-x 1 root root 44625920 4月   9 01:54 /usr/bin/kubeadm_src

# sha256sum
$ sha256sum /usr/bin/kubeadm* 
3994974fdf4ab235d15151dee18caf9224e910d83dcc4606263c5129d89ea9bd  /usr/bin/kubeadm
7bdaf0d58f0d286538376bc40b50d7e3ab60a3fe7a0709194f53f1605129550f  /usr/bin/kubeadm_src

# 官方发布的版本
$ kubeadm_src version
kubeadm version: &version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.0", GitCommit:"cb303e613a121a29364f75cc67d3d580833a7479", GitTreeState:"clean", BuildDate:"2021-04-08T16:30:03Z", GoVersion:"go1.16.1", Compiler:"gc", Platform:"linux/amd64"}

# 修改后的版本
$ kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"21+", GitVersion:"v1.21.0-dirty", GitCommit:"cb303e613a121a29364f75cc67d3d580833a7479", GitTreeState:"dirty", BuildDate:"2021-04-12T09:23:51Z", GoVersion:"go1.16.1", Compiler:"gc", Platform:"linux/amd64"}

dirty 标记代表 GitCommit 版本后有修改源代码。

生成证书

kubeadm init phase certs all
kubeadm init phase kubeconfig all

检查证书过期时间

$ kubeadm certs check-expiration
[check-expiration] Reading configuration from the cluster...
[check-expiration] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -o yaml'
[check-expiration] Error reading configuration from the Cluster. Falling back to default configuration

CERTIFICATE                EXPIRES                  RESIDUAL TIME   CERTIFICATE AUTHORITY   EXTERNALLY MANAGED
admin.conf                 Apr 10, 2031 10:02 UTC   9y                                      no      
apiserver                  Apr 10, 2031 10:02 UTC   9y              ca                      no      
apiserver-etcd-client      Apr 10, 2031 10:02 UTC   9y              etcd-ca                 no      
apiserver-kubelet-client   Apr 10, 2031 10:02 UTC   9y              ca                      no      
controller-manager.conf    Apr 10, 2031 10:02 UTC   9y                                      no      
etcd-healthcheck-client    Apr 10, 2031 10:02 UTC   9y              etcd-ca                 no      
etcd-peer                  Apr 10, 2031 10:02 UTC   9y              etcd-ca                 no      
etcd-server                Apr 10, 2031 10:02 UTC   9y              etcd-ca                 no      
front-proxy-client         Apr 10, 2031 10:02 UTC   9y              front-proxy-ca          no      
scheduler.conf             Apr 10, 2031 10:02 UTC   9y                                      no      

CERTIFICATE AUTHORITY   EXPIRES                  RESIDUAL TIME   EXTERNALLY MANAGED
ca                      Apr 10, 2031 10:02 UTC   9y              no      
etcd-ca                 Apr 10, 2031 10:02 UTC   9y              no      
front-proxy-ca          Apr 10, 2031 10:02 UTC   9y              no      

LICENSE

MIT