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kubernetes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 源码包中申明的证书过期时间

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 #这里的有效期为10年，可修改为任意时间期限
    NotAfter:     time.Now().Add(duration365d).UTC(),
make WHAT=cmd/kubeadm GOFLAGS=-v
cp _output/bin/kubeadm /root/kubeadm-new

4、更新 kubeadm（更新前先把老的备份，方案出错回滚）

# 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、高可用集群其余 mater 节点证书更新

 #!/bin/bash
masterNode="192.168.11.1 192.168.11.2" #改成自己对应的集群IP
#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