升级kubeadm部署的k8s集群
作者：互联网
升级kubeadm部署的k8s集群
K爷 DevOps视角
升级k8s集群
使用kubeadm部署kubernetes集群介绍了使用kubeadm快速部署k8s集群，这篇文章将升级k8s集群。
此升级方法仅适用于使用kubeadm部署的k8s集群。
升级kubeadm
升级k8s集群必须先升级kubeadm版本到要升级的版本。即要升级kubeadm部署的k8s级群，必须先升级kubeadm版本。
# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.2", GitCommit:"59603c6e503c87169aea6106f57b9f242f64df89", GitTreeState:"clean", BuildDate:"2020-01-18T23:27:49Z", GoVersion:"go1.13.5", Compiler:"gc", Platform:"linux/amd64"}各master升级到目的版本kubeadm
- 升级kubeadm
# apt-cache madison kubeadm
# apt-get install kubeadm=1.17.4-00
# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.4", GitCommit:"8d8aa39598534325ad77120c120a22b3a990b5ea", GitTreeState:"clean", BuildDate:"2020-03-12T21:01:11Z", GoVersion:"go1.13.8", Compiler:"gc", Platform:"linux/amd64"}- 查看升级计划
# 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] Making sure the cluster is healthy:
[upgrade] Fetching available versions to upgrade to
[upgrade/versions] Cluster version: v1.17.2
[upgrade/versions] kubeadm version: v1.17.4
I0723 15:10:34.814329 40861 version.go:251] remote version is much newer: v1.18.6; falling back to: stable-1.17
[upgrade/versions] Latest stable version: v1.17.9
[upgrade/versions] Latest version in the v1.17 series: v1.17.9
Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT CURRENT AVAILABLE
Kubelet 6 x v1.17.2 v1.17.9
Upgrade to the latest version in the v1.17 series:
COMPONENT CURRENT AVAILABLE
API Server v1.17.2 v1.17.9
Controller Manager v1.17.2 v1.17.9
Scheduler v1.17.2 v1.17.9
Kube Proxy v1.17.2 v1.17.9
CoreDNS 1.6.5 1.6.5
Etcd 3.4.3 3.4.3-0
You can now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.17.9
Note: Before you can perform this upgrade, you have to update kubeadm to v1.17.9.升级master
在各个master节点进行升级
master节点要一个一个升级，不要一起同时升级
# kubeadm upgrade apply v1.17.4
......
[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.17.4". Enjoy!
[upgrade/kubelet] Now that your control plane is upgraded, please proceed with upgrading your kubelets if you haven't already done so.
# docker images|grep v1.17.4
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy v1.17.4 6dec7cfde1e5 4 months ago 116MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver v1.17.4 2e1ba57fe95a 4 months ago 171MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-controller-manager v1.17.4 7f997fcf3e94 4 months ago 161MB
registry.cn-hangzhou.aliyuncs.com/google_containers/kube-scheduler v1.17.4升级kubelet和kubectl
# apt install kubelet=1.17.4-00 kubectl=1.17.4-00升级node节点
查看当前node 版本
# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master1 Ready master 25h v1.17.4
k8s-master2 Ready master 24h v1.17.4
k8s-master3 Ready master 24h v1.17.4
k8s-node1 Ready <none> 23h v1.17.2
k8s-node2 Ready <none> 23h v1.17.2
k8s-node3 Ready <none> 23h v1.17.2升级node节点配置文件
# kubeadm upgrade node --kubelet-version 1.17.4
[upgrade] Reading configuration from the cluster...
[upgrade] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[upgrade] Skipping phase. Not a control plane node.
[upgrade] Using kubelet config version 1.17.4, while kubernetes-version is v1.17.4
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.17" ConfigMap in the kube-system namespace
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[upgrade] The configuration for this node was successfully updated!
[upgrade] Now you should go ahead and upgrade the kubelet package using your package manager.升级node节点的kubelet、kubeadm
# apt install kubelet=1.17.4-00 kubeadm=1.17.4-00查看node
# kubectl get node
NAME STATUS ROLES AGE VERSION
k8s-master1 Ready master 25h v1.17.4
k8s-master2 Ready master 24h v1.17.4
k8s-master3 Ready master 24h v1.17.4
k8s-node1 Ready <none> 24h v1.17.4
k8s-node2 Ready <none> 24h v1.17.4
k8s-node3 Ready <none> 24h v1.17.4标签：upgrade,v1.17,kubelet,version,集群,kubeadm,k8s 来源： https://blog.51cto.com/15127511/2657644