升級kubernetes到指定版本實戰
1、在master節點上查看此時的kubernetes的版本
因為是yum安裝的kubernetes，需要查看此時的版本，然后再去官網查看1.14.1的最新版本是多少
[root@master ~]# rpm -qi kubeadm Name : kubeadm Version : 1.14.1 Release : 0 Architecture: x86_64 Install Date: Mon 13 Jan 2020 02:41:35 PM CST Group : Unspecified Size : 39588940 License : ASL 2.0 Signature : RSA/SHA512, Tue 09 Apr 2019 05:09:51 AM CST, Key ID f09c394c3e1ba8d5 Source RPM : kubelet-1.14.1-0.src.rpm Build Date : Tue 09 Apr 2019 05:02:41 AM CST Build Host : bf8516edf970 Relocations : (not relocatable) URL : https://kubernetes.io Summary : Command-line utility for administering a Kubernetes cluster. Description : Command-line utility for administering a Kubernetes cluster.
github官方網站：https://github.com/kubernetes/kubernetes/tags
2、在master上升級kubeadm到指定版本
1、在官網上查看此時1.14的最新版本是1.14.10版本，因此直接在master安裝1.14.3版本的kubeadm
[root@master ~]# yum -y install kubeadm-1.14.3
2、在master查看kubeadm幫助
[root@master ~]# kubeadm upgrade --help
Upgrade your cluster smoothly to a newer version with this command.
Usage:
kubeadm upgrade [flags]
kubeadm upgrade [command]
Available Commands:
apply Upgrade your Kubernetes cluster to the specified version.
diff Show what differences would be applied to existing static pod manifests. See also: kubeadm upgrade apply --dry-run
node Upgrade commands for a node in the cluster. Currently only supports upgrading the configuration, not the kubelet itself.
plan Check which versions are available to upgrade to and validate whether your current cluster is upgradeable. To skip the internet check, pass in the optional [version] parameter.
Flags:
-h, --help help for upgrade
Global Flags:
--log-file string If non-empty, use this log file
--rootfs string [EXPERIMENTAL] The path to the 'real' host root filesystem.
--skip-headers If true, avoid header prefixes in the log messages
-v, --v Level number for the log level verbosity
Use "kubeadm upgrade [command] --help" for more information about a command.
[root@master ~]#
3、在master節點查看升級計划，驗證是否可以升級到此版本
[root@master ~]# kubeadm upgrade plan [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: v1.14.1 [upgrade/versions] kubeadm version: v1.14.10 I0118 12:04:06.330170 5191 version.go:96] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable.txt": Get https://dl.k8s.io/release/stable.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) I0118 12:04:06.330206 5191 version.go:97] falling back to the local client version: v1.14.10 [upgrade/versions] Latest stable version: v1.14.10 I0118 12:04:16.392134 5191 version.go:96] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.14.txt": Get https://dl.k8s.io/release/stable-1.14.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers) I0118 12:04:16.392166 5191 version.go:97] falling back to the local client version: v1.14.10 [upgrade/versions] Latest version in the v1.14 series: v1.14.10 Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply': COMPONENT CURRENT AVAILABLE Kubelet 3 x v1.14.1 v1.14.3 Upgrade to the latest version in the v1.14 series: COMPONENT CURRENT AVAILABLE API Server v1.14.1 v1.14.3 #可以看到此時要升級的版本 Controller Manager v1.14.1 v1.14.3 Scheduler v1.14.1 v1.14.3 Kube Proxy v1.14.1 v1.14.3 CoreDNS 1.3.1 1.3.1 Etcd 3.3.10 3.3.3 You can now apply the upgrade by executing the following command: kubeadm upgrade apply v1.14.3
4、在master節點開始升級到指定的版本
[root@master ~]# kubeadm upgrade apply v1.14.3
顯示以下框的內容就說明已經升級成功！！！
5、在master節點上升級各node節點配置文件
[root@master ~]# kubeadm upgrade node config --kubelet-version 1.14.3 [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.14" 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.
3、在各個node節點上安裝最新版本的kubeadm、kubelet、kubectl包
[root@node1 ~]# yum -y install kubelet-1.14.3 kubeadm-1.14.3 kubectl-1.14.3 [root@node2 ~]# yum -y install kubelet-1.14.3 kubeadm-1.14.3 kubectl-1.14.3
4、驗證最后K8S升級后的版本
[root@master network-scripts]# kubectl get node NAME STATUS ROLES AGE VERSION master Ready master 21m v1.14.3 node1 Ready <none> 20m v1.14.3 node2 Ready <none> 20m v1.14.3