kubernetes学习总结-13证书的可用年限修改

对于kubernetes,颁发的证书的有效期一般是只有一年,目的是为了跟上K8s的更新步伐,但是对于一些企业,尤其是在一线业务居多的,更新不方便,并且对于一些网络隔离的项目,更新会造成很大的困扰。可以通过下载kubeadm源码,进行证书颁发的时间年限的修改。(源码是go语言编写)

  • 1、go 环境部署
wget https://dl.google.com/go/go1.12.7.linux-amd64.tar.gz
tar -zxvf go1.12.1.linux-amd64.tar.gz -C /usr/local
vi /etc/profile
export PATH=$PATH:/usr/local/go/bin
source /etc/profile
  • 2、下载源码
cd /data && git clone https://github.com/kubernetes/kubernetes.git
git checkout -b remotes/origin/release-1.15.1 v1.15.1
  • 3、修改 Kubeadm 源码包更新证书策略
vim staging/src/k8s.io/client-go/util/cert/cert.go  # kubeadm 1.14 版本之前
vim cmd/kubeadm/app/util/pkiutil/pki_helpers.go # kubeadm 1.14 至今
const duration365d = time.Hour * 24 * 365 #增加一个变量
NotAfter:     time.Now().Add(duration365d).UTC(), #替换Add中的内容
make WHAT=cmd/kubeadm GOFLAGS=-v #编译
cp _output/bin/kubeadm /root/kubeadm-new

  • 4、更新 kubeadm
# 将 kubeadm 进行替换
cp /usr/bin/kubeadm /usr/bin/kubeadm.old
cp /root/kubeadm-new /usr/bin/kubeadm
chmod a+x /usr/bin/kubeadm
  • 5、更新各节点证书至 Master 节点
cp -r /etc/kubernetes/pki /etc/kubernetes/pki.old
cd /etc/kubernetes/pki
kubeadm alpha certs renew all --config=/root/kubeadm-config.yaml
openssl x509 -in apiserver.crt -text -noout | grep Not
  • 6、HA集群其余 mater 节点证书更新
#!/bin/bash

masterNode="192.168.66.20 192.168.66.21"
#for host in ${masterNode}; do
#     scp /etc/kubernetes/pki/{ca.crt,ca.key,sa.key,sa.pub,front-proxy-ca.crt,front-proxy-ca.key} 
"${USER}"@$host:/etc/kubernetes/pki/
#     scp /etc/kubernetes/pki/etcd/{ca.crt,ca.key} "root"@$host:/etc/kubernetes/pki/etcd
#     scp /etc/kubernetes/admin.conf "root"@$host:/etc/kubernetes/
#done
for host in ${CONTROL_PLANE_IPS}; do
scp /etc/kubernetes/pki/{ca.crt,ca.key,sa.key,sa.pub,front-proxy-ca.crt,front-proxy-ca.key} 
"${USER}"@$host:/root/pki/
scp /etc/kubernetes/pki/etcd/{ca.crt,ca.key} "root"@$host:/root/etcd
scp /etc/kubernetes/admin.conf "root"@$host:/root/kubernetes/
done

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