Kubernetes证书有效期

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

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

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
	NotAfter: time.Now().Add(duration365d).UTC(),

make WHAT=cmd/kubeadm GOFLAGS=-v
cp _output/bin/kubeadm /root/kubeadm-new

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

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

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