k8s集群升级

以升级k8s集群v1.13.3到v1.14.0为例

升级次序：先升级master，后升级node
升级之前的准备：确保已经备份了etcd数据库与master节点的状态

升级master

安装kubernetes的yum源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
 
name=Kubernetes repo
 
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
 
gpgcheck=0
 
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
 
enabled=1

EOF

yum makecache

安装v1.14.0的kubeadm安装包

yum install -y kubeadm-1.14.0-0 --disableexcludes=kubernetes

卸载作为依赖安装的kubelet1.18.3

rpm -e kubelet-1.18.3-0.x86_64 --nodeps

验证下载的包是否为期望的版本

sudo kubeadm version

期望输出
kubeadm version: &version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.0", GitCommit:"641856db18352033a0d96dbc99153fa3b27298e5", GitTreeState:"clean", BuildDate:"2019-03-25T15:51:21Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}

验证集群是否可升级

sudo kubeadm upgrade plan

期望输出
[preflight] Running pre-flight checks.
[upgrade] Making sure the cluster is healthy:
[upgrade/config] Making sure the configuration is correct:
[upgrade/config] Reading configuration from the cluster...
[upgrade/config] FYI: You can look at this config file with ‘kubectl -n kube-system get cm kubeadm-config -oyaml‘
[upgrade] Fetching available versions to upgrade to
[upgrade/versions] Cluster version: v1.13.3
[upgrade/versions] kubeadm version: v1.14.0

Awesome, you‘re up-to-date! Enjoy!

执行升级

sudo kubeadm upgrade apply v1.14.0
交互界面输入y，确认升级
期望输出
[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.14.0". Enjoy!

升级kubelet与kubectl

yum install -y kubelet-1.14.0-0 kubectl-1.14.0-0 --disableexcludes=kubernetes

重启kubelet

sudo systemctl daemon-reload && systemctl restart kubelet

查看升级结果

NAME        STATUS   ROLES    AGE   VERSION
k8s-agent   Ready    <none>   66m   v1.13.3
k8s-cp      Ready    master   69m   v1.14.0

升级node

安装kubernetes的yum源

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
 
name=Kubernetes repo
 
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
 
gpgcheck=0
 
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
 
enabled=1

EOF

yum makecache

安装v1.14.0的kubeadm安装包

yum install -y kubeadm-1.14.0-0 --disableexcludes=kubernetes

卸载作为依赖安装的kubelet1.18.3

rpm -e kubelet-1.18.3-0.x86_64 --nodeps

修改kubelet配置

sudo kubeadm upgrade node config --kubelet-version v1.14.0

升级kubelet与kubectl

yum install -y kubelet-1.14.0-0 kubectl-1.14.0-0 --disableexcludes=kubernetes

重启kubelet

sudo systemctl daemon-reload && systemctl restart kubelet

查看升级结果

NAME        STATUS   ROLES    AGE   VERSION
k8s-agent   Ready    <none>   70m   v1.14.0
k8s-cp      Ready    master   73m   v1.14.0

k8s集群升级

原文：https://www.cnblogs.com/xiaoyuxixi/p/13152298.html