1 检查版本号
升级版本最好不超过2个版本，本例子版本原来是1.18.2
[root@k8s-master01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready master 339d v1.18.2
k8s-worker01 Ready <none> 338d v1.18.2
k8s-worker02 Ready <none> 338d v1.18.2
查看最新版本号
yum list --showduplicates kubeadm
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.ustc.edu.cn
* extras: mirrors.ustc.edu.cn
* updates: mirrors.cn99.com
已安装的软件包
kubeadm.x86_64 1.18.2-0 @kubernetes
可安装的软件包
kubeadm.x86_64 1.6.0-0 kubernetes
kubeadm.x86_64 1.6.1-0 kubernetes
kubeadm.x86_64 1.6.2-0 kubernetes
kubeadm.x86_64 1.6.3-0 kubernetes
kubeadm.x86_64 1.6.4-0 kubernetes
kubeadm.x86_64 1.6.5-0 kubernetes
kubeadm.x86_64 1.6.6-0 kubernetes
kubeadm.x86_64 1.6.7-0 kubernetes
kubeadm.x86_64 1.6.8-0 kubernetes
kubeadm.x86_64 1.6.9-0 kubernetes
kubeadm.x86_64 1.6.10-0 kubernetes
kubeadm.x86_64 1.6.11-0 kubernetes
kubeadm.x86_64 1.6.12-0 kubernetes
kubeadm.x86_64 1.6.13-0 kubernetes
kubeadm.x86_64 1.7.0-0 kubernetes
kubeadm.x86_64 1.7.1-0 kubernetes
kubeadm.x86_64 1.7.2-0 kubernetes
kubeadm.x86_64 1.7.3-1 kubernetes
kubeadm.x86_64 1.7.4-0 kubernetes
kubeadm.x86_64 1.7.5-0 kubernetes
kubeadm.x86_64 1.7.6-1 kubernetes
kubeadm.x86_64 1.7.7-1 kubernetes
kubeadm.x86_64 1.7.8-1 kubernetes
kubeadm.x86_64 1.7.9-0 kubernetes
kubeadm.x86_64 1.7.10-0 kubernetes
kubeadm.x86_64 1.7.11-0 kubernetes
kubeadm.x86_64 1.7.14-0 kubernetes
kubeadm.x86_64 1.7.15-0 kubernetes
kubeadm.x86_64 1.7.16-0 kubernetes
kubeadm.x86_64 1.8.0-0 kubernetes
kubeadm.x86_64 1.8.0-1 kubernetes
kubeadm.x86_64 1.8.1-0 kubernetes
kubeadm.x86_64 1.8.2-0 kubernetes
kubeadm.x86_64 1.8.3-0 kubernetes
kubeadm.x86_64 1.8.4-0 kubernetes
kubeadm.x86_64 1.8.5-0 kubernetes
kubeadm.x86_64 1.8.6-0 kubernetes
kubeadm.x86_64 1.8.7-0 kubernetes
kubeadm.x86_64 1.8.8-0 kubernetes
kubeadm.x86_64 1.8.9-0 kubernetes
kubeadm.x86_64 1.8.10-0 kubernetes
kubeadm.x86_64 1.8.11-0 kubernetes
kubeadm.x86_64 1.8.12-0 kubernetes
kubeadm.x86_64 1.8.13-0 kubernetes
kubeadm.x86_64 1.8.14-0 kubernetes
kubeadm.x86_64 1.8.15-0 kubernetes
kubeadm.x86_64 1.9.0-0 kubernetes
kubeadm.x86_64 1.9.1-0 kubernetes
kubeadm.x86_64 1.9.2-0 kubernetes
kubeadm.x86_64 1.9.3-0 kubernetes
kubeadm.x86_64 1.9.4-0 kubernetes
kubeadm.x86_64 1.9.5-0 kubernetes
kubeadm.x86_64 1.9.6-0 kubernetes
kubeadm.x86_64 1.9.7-0 kubernetes
kubeadm.x86_64 1.9.8-0 kubernetes
kubeadm.x86_64 1.9.9-0 kubernetes
kubeadm.x86_64 1.9.10-0 kubernetes
kubeadm.x86_64 1.9.11-0 kubernetes
kubeadm.x86_64 1.10.0-0 kubernetes
kubeadm.x86_64 1.10.1-0 kubernetes
kubeadm.x86_64 1.10.2-0 kubernetes
kubeadm.x86_64 1.10.3-0 kubernetes
kubeadm.x86_64 1.10.4-0 kubernetes
kubeadm.x86_64 1.10.5-0 kubernetes
kubeadm.x86_64 1.10.6-0 kubernetes
kubeadm.x86_64 1.10.7-0 kubernetes
kubeadm.x86_64 1.10.8-0 kubernetes
kubeadm.x86_64 1.10.9-0 kubernetes
kubeadm.x86_64 1.10.10-0 kubernetes
kubeadm.x86_64 1.10.11-0 kubernetes
kubeadm.x86_64 1.10.12-0 kubernetes
kubeadm.x86_64 1.10.13-0 kubernetes
kubeadm.x86_64 1.11.0-0 kubernetes
kubeadm.x86_64 1.11.1-0 kubernetes
kubeadm.x86_64 1.11.2-0 kubernetes
kubeadm.x86_64 1.11.3-0 kubernetes
kubeadm.x86_64 1.11.4-0 kubernetes
kubeadm.x86_64 1.11.5-0 kubernetes
kubeadm.x86_64 1.11.6-0 kubernetes
kubeadm.x86_64 1.11.7-0 kubernetes
kubeadm.x86_64 1.11.8-0 kubernetes
kubeadm.x86_64 1.11.9-0 kubernetes
kubeadm.x86_64 1.11.10-0 kubernetes
kubeadm.x86_64 1.12.0-0 kubernetes
kubeadm.x86_64 1.12.1-0 kubernetes
kubeadm.x86_64 1.12.2-0 kubernetes
kubeadm.x86_64 1.12.3-0 kubernetes
kubeadm.x86_64 1.12.4-0 kubernetes
kubeadm.x86_64 1.12.5-0 kubernetes
kubeadm.x86_64 1.12.6-0 kubernetes
kubeadm.x86_64 1.12.7-0 kubernetes
kubeadm.x86_64 1.12.8-0 kubernetes
kubeadm.x86_64 1.12.9-0 kubernetes
kubeadm.x86_64 1.12.10-0 kubernetes
kubeadm.x86_64 1.13.0-0 kubernetes
kubeadm.x86_64 1.13.1-0 kubernetes
kubeadm.x86_64 1.13.2-0 kubernetes
kubeadm.x86_64 1.13.3-0 kubernetes
kubeadm.x86_64 1.13.4-0 kubernetes
kubeadm.x86_64 1.13.5-0 kubernetes
kubeadm.x86_64 1.13.6-0 kubernetes
kubeadm.x86_64 1.13.7-0 kubernetes
kubeadm.x86_64 1.13.8-0 kubernetes
kubeadm.x86_64 1.13.9-0 kubernetes
kubeadm.x86_64 1.13.10-0 kubernetes
kubeadm.x86_64 1.13.11-0 kubernetes
kubeadm.x86_64 1.13.12-0 kubernetes
kubeadm.x86_64 1.14.0-0 kubernetes
kubeadm.x86_64 1.14.1-0 kubernetes
kubeadm.x86_64 1.14.2-0 kubernetes
kubeadm.x86_64 1.14.3-0 kubernetes
kubeadm.x86_64 1.14.4-0 kubernetes
kubeadm.x86_64 1.14.5-0 kubernetes
kubeadm.x86_64 1.14.6-0 kubernetes
kubeadm.x86_64 1.14.7-0 kubernetes
kubeadm.x86_64 1.14.8-0 kubernetes
kubeadm.x86_64 1.14.9-0 kubernetes
kubeadm.x86_64 1.14.10-0 kubernetes
kubeadm.x86_64 1.15.0-0 kubernetes
kubeadm.x86_64 1.15.1-0 kubernetes
kubeadm.x86_64 1.15.2-0 kubernetes
kubeadm.x86_64 1.15.3-0 kubernetes
kubeadm.x86_64 1.15.4-0 kubernetes
kubeadm.x86_64 1.15.5-0 kubernetes
kubeadm.x86_64 1.15.6-0 kubernetes
kubeadm.x86_64 1.15.7-0 kubernetes
kubeadm.x86_64 1.15.8-0 kubernetes
kubeadm.x86_64 1.15.9-0 kubernetes
kubeadm.x86_64 1.15.10-0 kubernetes
kubeadm.x86_64 1.15.11-0 kubernetes
kubeadm.x86_64 1.15.12-0 kubernetes
kubeadm.x86_64 1.16.0-0 kubernetes
kubeadm.x86_64 1.16.1-0 kubernetes
kubeadm.x86_64 1.16.2-0 kubernetes
kubeadm.x86_64 1.16.3-0 kubernetes
kubeadm.x86_64 1.16.4-0 kubernetes
kubeadm.x86_64 1.16.5-0 kubernetes
kubeadm.x86_64 1.16.6-0 kubernetes
kubeadm.x86_64 1.16.7-0 kubernetes
kubeadm.x86_64 1.16.8-0 kubernetes
kubeadm.x86_64 1.16.9-0 kubernetes
kubeadm.x86_64 1.16.10-0 kubernetes
kubeadm.x86_64 1.16.11-0 kubernetes
kubeadm.x86_64 1.16.11-1 kubernetes
kubeadm.x86_64 1.16.12-0 kubernetes
kubeadm.x86_64 1.16.13-0 kubernetes
kubeadm.x86_64 1.16.14-0 kubernetes
kubeadm.x86_64 1.16.15-0 kubernetes
kubeadm.x86_64 1.17.0-0 kubernetes
kubeadm.x86_64 1.17.1-0 kubernetes
kubeadm.x86_64 1.17.2-0 kubernetes
kubeadm.x86_64 1.17.3-0 kubernetes
kubeadm.x86_64 1.17.4-0 kubernetes
kubeadm.x86_64 1.17.5-0 kubernetes
kubeadm.x86_64 1.17.6-0 kubernetes
kubeadm.x86_64 1.17.7-0 kubernetes
kubeadm.x86_64 1.17.7-1 kubernetes
kubeadm.x86_64 1.17.8-0 kubernetes
kubeadm.x86_64 1.17.9-0 kubernetes
kubeadm.x86_64 1.17.11-0 kubernetes
kubeadm.x86_64 1.17.12-0 kubernetes
kubeadm.x86_64 1.17.13-0 kubernetes
kubeadm.x86_64 1.17.14-0 kubernetes
kubeadm.x86_64 1.17.15-0 kubernetes
kubeadm.x86_64 1.17.16-0 kubernetes
kubeadm.x86_64 1.17.17-0 kubernetes
kubeadm.x86_64 1.18.0-0 kubernetes
kubeadm.x86_64 1.18.1-0 kubernetes
kubeadm.x86_64 1.18.2-0 kubernetes
kubeadm.x86_64 1.18.3-0 kubernetes
kubeadm.x86_64 1.18.4-0 kubernetes
kubeadm.x86_64 1.18.4-1 kubernetes
kubeadm.x86_64 1.18.5-0 kubernetes
kubeadm.x86_64 1.18.6-0 kubernetes
kubeadm.x86_64 1.18.8-0 kubernetes
kubeadm.x86_64 1.18.9-0 kubernetes
kubeadm.x86_64 1.18.10-0 kubernetes
kubeadm.x86_64 1.18.12-0 kubernetes
kubeadm.x86_64 1.18.13-0 kubernetes
kubeadm.x86_64 1.18.14-0 kubernetes
kubeadm.x86_64 1.18.15-0 kubernetes
kubeadm.x86_64 1.18.16-0 kubernetes
kubeadm.x86_64 1.18.17-0 kubernetes
kubeadm.x86_64 1.18.18-0 kubernetes
kubeadm.x86_64 1.18.19-0 kubernetes
kubeadm.x86_64 1.18.20-0 kubernetes
kubeadm.x86_64 1.19.0-0 kubernetes
kubeadm.x86_64 1.19.1-0 kubernetes
kubeadm.x86_64 1.19.2-0 kubernetes
kubeadm.x86_64 1.19.3-0 kubernetes
kubeadm.x86_64 1.19.4-0 kubernetes
kubeadm.x86_64 1.19.5-0 kubernetes
kubeadm.x86_64 1.19.6-0 kubernetes
kubeadm.x86_64 1.19.7-0 kubernetes
kubeadm.x86_64 1.19.8-0 kubernetes
kubeadm.x86_64 1.19.9-0 kubernetes
kubeadm.x86_64 1.19.10-0 kubernetes
kubeadm.x86_64 1.19.11-0 kubernetes
kubeadm.x86_64 1.19.12-0 kubernetes
kubeadm.x86_64 1.19.13-0 kubernetes
kubeadm.x86_64 1.19.14-0 kubernetes
kubeadm.x86_64 1.19.15-0 kubernetes
kubeadm.x86_64 1.19.16-0 kubernetes
kubeadm.x86_64 1.20.0-0 kubernetes
kubeadm.x86_64 1.20.1-0 kubernetes
kubeadm.x86_64 1.20.2-0 kubernetes
kubeadm.x86_64 1.20.4-0 kubernetes
kubeadm.x86_64 1.20.5-0 kubernetes
kubeadm.x86_64 1.20.6-0 kubernetes
kubeadm.x86_64 1.20.7-0 kubernetes
kubeadm.x86_64 1.20.8-0 kubernetes
kubeadm.x86_64 1.20.9-0 kubernetes
kubeadm.x86_64 1.20.10-0 kubernetes
kubeadm.x86_64 1.20.11-0 kubernetes
kubeadm.x86_64 1.20.12-0 kubernetes
kubeadm.x86_64 1.20.13-0 kubernetes
kubeadm.x86_64 1.20.14-0 kubernetes
kubeadm.x86_64 1.21.0-0 kubernetes
kubeadm.x86_64 1.21.1-0 kubernetes
kubeadm.x86_64 1.21.2-0 kubernetes
kubeadm.x86_64 1.21.3-0 kubernetes
kubeadm.x86_64 1.21.4-0 kubernetes
kubeadm.x86_64 1.21.5-0 kubernetes
kubeadm.x86_64 1.21.6-0 kubernetes
kubeadm.x86_64 1.21.7-0 kubernetes
kubeadm.x86_64 1.21.8-0 kubernetes
kubeadm.x86_64 1.22.0-0 kubernetes
kubeadm.x86_64 1.22.1-0 kubernetes
kubeadm.x86_64 1.22.2-0 kubernetes
kubeadm.x86_64 1.22.3-0 kubernetes
kubeadm.x86_64 1.22.4-0 kubernetes
kubeadm.x86_64 1.22.5-0 kubernetes
kubeadm.x86_64 1.23.0-0 kubernetes
kubeadm.x86_64 1.23.1-0 kubernetes
2 升级
查看kubeadm版本号
# # kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:54:15Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
驱除节点
kubectl drain k8s-master01 --ignore-daemonsets
查看可以升级的版本：
# kubeadm upgrade plan
[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'
[preflight] Running pre-flight checks.
[upgrade] Running cluster health checks
[upgrade] Fetching available versions to upgrade to
[upgrade/versions] Cluster version: v1.18.2
[upgrade/versions] kubeadm version: v1.18.2
I0123 21:49:10.342197 17942 version.go:252] remote version is much newer: v1.23.2; falling back to: stable-1.18
[upgrade/versions] Latest stable version: v1.18.20
[upgrade/versions] Latest stable version: v1.18.20
[upgrade/versions] Latest version in the v1.18 series: v1.18.20
[upgrade/versions] Latest version in the v1.18 series: v1.18.20
Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT CURRENT AVAILABLE
Kubelet 3 x v1.18.2 v1.18.20
Upgrade to the latest version in the v1.18 series:
COMPONENT CURRENT AVAILABLE
API Server v1.18.2 v1.18.20
Controller Manager v1.18.2 v1.18.20
Scheduler v1.18.2 v1.18.20
Kube Proxy v1.18.2 v1.18.20
CoreDNS 1.6.7 1.6.7
Etcd 3.4.3 3.4.3-0
You can now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.18.20
Note: Before you can perform this upgrade, you have to update kubeadm to v1.18.20.
_____________________________________________________________________
先升级kubeadm到v1.18.20
yum install -y kubeadm-1.18.20-0
以上可见只能升级到v1.18.20，不升级etcd，不加–etcd-upgrade=false就默认升级etcd
kubeadm upgrade apply v1.18.20 --etcd-upgrade=false
提示内容：
kubeadm upgrade apply v1.18.20 --etcd-upgrade=false
[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'
[preflight] Running pre-flight checks.
[upgrade] Running cluster health checks
[upgrade/version] You have chosen to change the cluster version to "v1.18.20"
[upgrade/versions] Cluster version: v1.18.2
[upgrade/versions] kubeadm version: v1.18.20
[upgrade/confirm] Are you sure you want to proceed with the upgrade? [y/N]: y
[upgrade/prepull] Will prepull images for components [kube-apiserver kube-controller-manager kube-scheduler]
[upgrade/prepull] Prepulling image for component kube-scheduler.
[upgrade/prepull] Prepulling image for component kube-apiserver.
[upgrade/prepull] Prepulling image for component kube-controller-manager.
[apiclient] Found 1 Pods for label selector k8s-app=upgrade-prepull-kube-apiserver
[apiclient] Found 0 Pods for label selector k8s-app=upgrade-prepull-kube-controller-manager
[apiclient] Found 0 Pods for label selector k8s-app=upgrade-prepull-kube-scheduler
[apiclient] Found 1 Pods for label selector k8s-app=upgrade-prepull-kube-controller-manager
[apiclient] Found 1 Pods for label selector k8s-app=upgrade-prepull-kube-scheduler
[upgrade/prepull] Prepulled image for component kube-apiserver.
[upgrade/prepull] Prepulled image for component kube-controller-manager.
[upgrade/prepull] Prepulled image for component kube-scheduler.
[upgrade/prepull] Successfully prepulled the images for all the control plane components
[upgrade/apply] Upgrading your Static Pod-hosted control plane to version "v1.18.20"...
Static pod: kube-apiserver-k8s-master01 hash: 8a726ebb37b068e754a16cf668a7a35e
Static pod: kube-controller-manager-k8s-master01 hash: 767925630d81048a06b8538a677d7868
Static pod: kube-scheduler-k8s-master01 hash: ee9a7919683b33fc13e88e8d931591da
[upgrade/staticpods] Writing new Static Pod manifests to "/etc/kubernetes/tmp/kubeadm-upgraded-manifests946840149"
W0123 21:57:06.189240 21942 manifests.go:225] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
[upgrade/staticpods] Preparing for "kube-apiserver" upgrade
[upgrade/staticpods] Renewing apiserver certificate
[upgrade/staticpods] Renewing apiserver-kubelet-client certificate
[upgrade/staticpods] Renewing front-proxy-client certificate
[upgrade/staticpods] Renewing apiserver-etcd-client certificate
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-apiserver.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2022-01-23-21-57-06/kube-apiserver.yaml"
[upgrade/staticpods] Waiting for the kubelet to restart the component
[upgrade/staticpods] This might take a minute or longer depending on the component/version gap (timeout 5m0s)
Static pod: kube-apiserver-k8s-master01 hash: 8a726ebb37b068e754a16cf668a7a35e
Static pod: kube-apiserver-k8s-master01 hash: 729750d538579e893ffe4e6935653781
[apiclient] Found 1 Pods for label selector component=kube-apiserver
[upgrade/staticpods] Component "kube-apiserver" upgraded successfully!
[upgrade/staticpods] Preparing for "kube-controller-manager" upgrade
[upgrade/staticpods] Renewing controller-manager.conf certificate
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-controller-manager.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2022-01-23-21-57-06/kube-controller-manager.yaml"
[upgrade/staticpods] Waiting for the kubelet to restart the component
[upgrade/staticpods] This might take a minute or longer depending on the component/version gap (timeout 5m0s)
Static pod: kube-controller-manager-k8s-master01 hash: 767925630d81048a06b8538a677d7868
Static pod: kube-controller-manager-k8s-master01 hash: a7d614b669c8901536196c540f84103d
[apiclient] Found 1 Pods for label selector component=kube-controller-manager
[upgrade/staticpods] Component "kube-controller-manager" upgraded successfully!
[upgrade/staticpods] Preparing for "kube-scheduler" upgrade
[upgrade/staticpods] Renewing scheduler.conf certificate
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-scheduler.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2022-01-23-21-57-06/kube-scheduler.yaml"
[upgrade/staticpods] Waiting for the kubelet to restart the component
[upgrade/staticpods] This might take a minute or longer depending on the component/version gap (timeout 5m0s)
Static pod: kube-scheduler-k8s-master01 hash: ee9a7919683b33fc13e88e8d931591da
Static pod: kube-scheduler-k8s-master01 hash: c871ae39a802385d75a9bc63229003c0
[apiclient] Found 1 Pods for label selector component=kube-scheduler
[upgrade/staticpods] Component "kube-scheduler" upgraded successfully!
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.18" in namespace kube-system with the configuration for the kubelets in the cluster
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy
[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.18.20". Enjoy!
[upgrade/kubelet] Now that your control plane is upgraded, please proceed with upgrading your kubelets if you haven't already done so.
提示还没有升级成功，其实没有升级kubelet及kubectl。
# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready,SchedulingDisabled master 339d v1.18.2
k8s-worker01 Ready <none> 338d v1.18.2
k8s-worker02 Ready <none> 338d v1.18.2
升级kubelet及kubectl
yum install -y kubelet-1.18.20-0 kubectl-1.18.20-0
重启kubelet
# systemctl daemon-reload
# systemctl restart kubelet
取消不可调度：
kubectl uncordon k8s-master01
查看，发现版本已经更新：
# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready master 339d v1.18.20
k8s-worker01 Ready <none> 338d v1.18.2
k8s-worker02 Ready <none> 338d v1.18.2
2 升级worker节点
worker节点安装：
yum install -y kubeadm-1.18.20-0
master节点驱除：
kubectl drain k8s-worker01 --delete-local-data --ignore-daemonsets
worker节点升级：
kubeadm upgrade node
worker节点安装kubelet及kubectl:
yum install -y kubelet-1.18.20-0 kubectl-1.18.20-0
worker节点重启kubelet：
# systemctl daemon-reload
# systemctl restart kubelet
master节点取消不可调度：
kubectl uncordon k8s-worker01
master节点查看：
# kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master01 Ready master 339d v1.18.20
k8s-worker01 Ready <none> 338d v1.18.20
k8s-worker02 Ready <none> 338d v1.18.2
kubectl drain node02 --delete-local-data --ignore-daemonsets --force
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