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本文以kubernetes文件為例，為大家分析kubernetes進行離線升級和在線升級的方法步驟。閱讀完整文相信大家對kubernetes升級更新有了一定的認識。
kubernetes版本升級迭代非?？欤咳齻€月更新一個版本,很多新的功能在新版本中快速迭代，為了與社區(qū)版本功能保持一致，升級kubernetes集群，社區(qū)已通過kubeadm工具統(tǒng)一升級集群，升級步驟簡單易行。首先來看下升級kubernetes集群需要升級那些組件：
worker工作節(jié)點，升級工作節(jié)點上的Container Runtime如docker，kubelet和kube-proxy。
版本升級通常分為兩類：小版本升級和跨版本升級，小版本升級如1.14.1升級只1.14.2，小版本之間可以跨版本升級如1.14.1直接升級至1.14.3；跨版本升級指大版本升級，如1.14.x升級至1.15.x。本文以離線的方式將1.14.1升級至1.1.5.1版本，升級前需要滿足條件如下：
1、查看當前版本,系統(tǒng)上部署的版本是1.1.4.1
[root@node-1 ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.1", GitCommit:"b7394102d6ef778017f2ca4046abbaa23b88c290", GitTreeState:"clean", BuildDate:"2019-04-08T17:11:31Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.1", GitCommit:"b7394102d6ef778017f2ca4046abbaa23b88c290", GitTreeState:"clean", BuildDate:"2019-04-08T17:02:58Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}
[root@node-1 ~]# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"14", GitVersion:"v1.14.1", GitCommit:"b7394102d6ef778017f2ca4046abbaa23b88c290", GitTreeState:"clean", BuildDate:"2019-04-08T17:08:49Z", GoVersion:"go1.12.1", Compiler:"gc", Platform:"linux/amd64"}2、查看node節(jié)點的版本,node上的kubelet和kube-proxy使用1.1.4.1版本
[root@node-1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-1 Ready master 25h v1.14.1
node-2 Ready <none> 25h v1.14.1
node-3 Ready <none> 25h v1.14.13、其他組件狀態(tài)，確保當前組件，應用狀態(tài)正常
[root@node-1 ~]# kubectl get componentstatuses
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
[root@node-1 ~]#
[root@node-1 ~]# kubectl get deployments --all-namespaces
NAMESPACE NAME READY UP-TO-DATE AVAILABLE AGE
default demo 3/3 3 3 37m
kube-system coredns 2/2 2 2 25h4、查看kubernetes最新版本（配置kubernetes的yum源，需要合理上網(wǎng)才可以訪問），使用yum list --showduplicates kubeadm --disableexcludes=kubernetes查看當前能升級版本，綠色為當前版本，藍色為可以升級的版本，如下圖：
1、倒入安裝鏡像，先從https://pan.baidu.com/s/1hw8Q0Vf3xvhKoEiVtMi6SA網(wǎng)盤中下載kubernetes安裝鏡像并上傳到集群中，解壓并進入到v1.15.1目錄下，將鏡像倒入到三個節(jié)點中,以node-2為例倒入鏡像：
倒入鏡像：
[root@node-2 v1.15.1]# docker image load -i kube-apiserver\:v1.15.1.tar
[root@node-2 v1.15.1]# docker image load -i kube-scheduler\:v1.15.1.tar
[root@node-2 v1.15.1]# docker image load -i kube-controller-manager\:v1.15.1.tar
[root@node-2 v1.15.1]# docker image load -i kube-proxy\:v1.15.1.tar
查看當前系統(tǒng)導入鏡像列表：
[root@node-1 ~]# docker image list
REPOSITORY TAG IMAGE ID CREATED SIZE
k8s.gcr.io/kube-proxy v1.15.1 89a062da739d 8 weeks ago 82.4MB
k8s.gcr.io/kube-controller-manager v1.15.1 d75082f1d121 8 weeks ago 159MB
k8s.gcr.io/kube-scheduler v1.15.1 b0b3c4c404da 8 weeks ago 81.1MB
k8s.gcr.io/kube-apiserver v1.15.1 68c3eb07bfc3 8 weeks ago 207MB
k8s.gcr.io/kube-proxy v1.14.1 20a2d7035165 5 months ago 82.1MB
k8s.gcr.io/kube-apiserver v1.14.1 cfaa4ad74c37 5 months ago 210MB
k8s.gcr.io/kube-scheduler v1.14.1 8931473d5bdb 5 months ago 81.6MB
k8s.gcr.io/kube-controller-manager v1.14.1 efb3887b411d 5 months ago 158MB
quay.io/coreos/flannel v0.11.0-amd64 ff281650a721 7 months ago 52.6MB
k8s.gcr.io/coredns 1.3.1 eb516548c180 8 months ago 40.3MB
k8s.gcr.io/etcd 3.3.10 2c4adeb21b4f 9 months ago 258MB
k8s.gcr.io/pause 3.1 da86e6ba6ca1 21 months ago 742kB2、更新kubeadm版本至1.15.1，國內(nèi)可以參考https://blog.51cto.com/2157217/1983992設置kubernetes源
3、校驗kubeadm版本,已升級至1.1.5.1版本
[root@node-1 ~]# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"15", GitVersion:"v1.15.1", GitCommit:"4485c6f18cee9a5d3c3b4e523bd27972b1b53892", GitTreeState:"clean", BuildDate:"2019-07-18T09:15:32Z", GoVersion:"go1.12.5", Compiler:"gc", Platform:"linux/amd64"}4、查看升級計劃，通過kubeadm可以查看當前集群的升級計劃，會顯示當前小版本最新的版本以及社區(qū)最新的版本
[root@node-1 ~]# 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: v1.14.1 #當前集群版本
[upgrade/versions] kubeadm version: v1.15.1 #當前kubeadm版本
[upgrade/versions] Latest stable version: v1.15.3 #社區(qū)最新版本
[upgrade/versions] Latest version in the v1.14 series: v1.14.6 #1.14.x中最新的版本
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 v1.14.6
Upgrade to the latest version in the v1.14 series:
COMPONENT CURRENT AVAILABLE #可升級的版本信息，當前可從1.14.1升級至1.14.6版本
API Server v1.14.1 v1.14.6
Controller Manager v1.14.1 v1.14.6
Scheduler v1.14.1 v1.14.6
Kube Proxy v1.14.1 v1.14.6
CoreDNS 1.3.1 1.3.1
Etcd 3.3.10 3.3.10
You can now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.14.6 #升級至1.14.6執(zhí)行的操作命令
_____________________________________________________________________
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 v1.15.3
Upgrade to the latest stable version:
COMPONENT CURRENT AVAILABLE #跨版本升級的版本，當前最新的版本是1.15.3
API Server v1.14.1 v1.15.3
Controller Manager v1.14.1 v1.15.3
Scheduler v1.14.1 v1.15.3
Kube Proxy v1.14.1 v1.15.3
CoreDNS 1.3.1 1.3.1
Etcd 3.3.10 3.3.10
You can now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.15.3 #升級至社區(qū)最新的版本執(zhí)行的操作
Note: Before you can perform this upgrade, you have to update kubeadm to v1.15.3.
_____________________________________________________________________5、當前鏡像沒有下載最新鏡像，本文以升級1.1.5.1版本為例，升級其他版本相類似，需要確保當前集群已獲取到相關(guān)鏡像，升級過程中也會更新證書，可通過--certificate-renewal=false關(guān)閉證書升級，升級至1.15.1版本操作如下：
[root@node-1 ~]# kubeadm upgrade apply v1.15.1
[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/version] You have chosen to change the cluster version to "v1.15.1"
[upgrade/versions] Cluster version: v1.14.1
[upgrade/versions] kubeadm version: v1.15.1
[upgrade/confirm] Are you sure you want to proceed with the upgrade? [y/N]: y 版本升級信息，確認操作
[upgrade/prepull] Will prepull images for components [kube-apiserver kube-controller-manager kube-scheduler etcd]
[upgrade/prepull] Prepulling image for component etcd.
[upgrade/prepull] Prepulling image for component kube-apiserver.
[upgrade/prepull] Prepulling image for component kube-controller-manager.
[upgrade/prepull] Prepulling image for component kube-scheduler.
[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-apiserver
[apiclient] Found 0 Pods for label selector k8s-app=upgrade-prepull-etcd
[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
[apiclient] Found 1 Pods for label selector k8s-app=upgrade-prepull-etcd
[apiclient] Found 1 Pods for label selector k8s-app=upgrade-prepull-kube-apiserver
[upgrade/prepull] Prepulled image for component kube-controller-manager.
[upgrade/prepull] Prepulled image for component kube-scheduler.
[upgrade/prepull] Prepulled image for component etcd.
[upgrade/prepull] Prepulled image for component kube-apiserver. #拉取鏡像的步驟
[upgrade/prepull] Successfully prepulled the images for all the control plane components
[upgrade/apply] Upgrading your Static Pod-hosted control plane to version "v1.15.1"...
Static pod: kube-apiserver-node-1 hash: bdf7ffba48feb2fc4c7676e7525066fd
Static pod: kube-controller-manager-node-1 hash: ecf9c37413eace225bc60becabeddb3b
Static pod: kube-scheduler-node-1 hash: f44110a0ca540009109bfc32a7eb0baa
[upgrade/etcd] Upgrading to TLS for etcd #開始更新靜態(tài)pod，及master上的每個節(jié)點
[upgrade/staticpods] Writing new Static Pod manifests to "/etc/kubernetes/tmp/kubeadm-upgraded-manifests122291749"
[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 #更新證書
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-apiserver.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2019-09-15-12-41-40/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-node-1 hash: bdf7ffba48feb2fc4c7676e7525066fd
Static pod: kube-apiserver-node-1 hash: bdf7ffba48feb2fc4c7676e7525066fd
Static pod: kube-apiserver-node-1 hash: bdf7ffba48feb2fc4c7676e7525066fd
Static pod: kube-apiserver-node-1 hash: 4cd1e2acc44e2d908fd2c7b307bfce59
[apiclient] Found 1 Pods for label selector component=kube-apiserver
[upgrade/staticpods] Component "kube-apiserver" upgraded successfully! #更新成功
[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-2019-09-15-12-41-40/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-node-1 hash: ecf9c37413eace225bc60becabeddb3b
Static pod: kube-controller-manager-node-1 hash: 17b23c8c6fcf9b9f8a3061b3a2fbf633
[apiclient] Found 1 Pods for label selector component=kube-controller-manager
[upgrade/staticpods] Component "kube-controller-manager" upgraded successfully!#更新成功
[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-2019-09-15-12-41-40/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-node-1 hash: f44110a0ca540009109bfc32a7eb0baa
Static pod: kube-scheduler-node-1 hash: 18859150495c74ad1b9f283da804a3db
[apiclient] Found 1 Pods for label selector component=kube-scheduler
[upgrade/staticpods] Component "kube-scheduler" upgraded successfully! #更新成功
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.15" in namespace kube-system with the configuration for the kubelets in the cluster
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" 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 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 "v1.15.1". Enjoy! #更新成功提示
[upgrade/kubelet] Now that your control plane is upgraded, please proceed with upgrading your kubelets if you haven't already done so.6、上述可看到master升級成功的信息，升級指特定版本只需要在apply的后面指定具體的版本即可，升級完完master后可以升級各個組件的plugin，詳情參考不同網(wǎng)絡的升級步驟，如flannel，calico等，升級過程升級對應的DaemonSets即可。
7、升級kubelet版本并重啟kubelet服務，至此，master節(jié)點版本升級完畢。
[root@node-1 ~]# yum install -y kubelet-1.15.1-0 kubectl-1.15.1-0 --disableexcludes=kubernetes
[root@node-1 ~]# systemctl daemon-reload
[root@node-1 ~]# systemctl restart kubelet1、升級kubeadm和kubelet軟件包
[root@node-2 ~]# yum install -y kubelet-1.15.1-0 --disableexcludes=kubernetes
[root@node-2 ~]# yum install -y kubeadm-1.15.1-0 --disableexcludes=kubernetes
[root@node-2 ~]# yum install -y kubectl-1.15.1-0 --disableexcludes=kubernetes2、設置節(jié)點進入維護模式并驅(qū)逐worker節(jié)點上的應用，會將出了DaemonSets之外的其他應用遷移到其他節(jié)點上
設置維護和驅(qū)逐：
[root@node-1 ~]# kubectl drain node-2 --ignore-daemonsets
node/node-2 cordoned
WARNING: ignoring DaemonSet-managed Pods: kube-system/kube-flannel-ds-amd64-tm6wj, kube-system/kube-proxy-2wqhj
evicting pod "coredns-5c98db65d4-86gg7"
evicting pod "demo-7b86696648-djvgb"
pod/demo-7b86696648-djvgb evicted
pod/coredns-5c98db65d4-86gg7 evicted
node/node-2 evicted
查看node的情況，此時node-2多了SchedulingDisabled標識位，即新的node都不會調(diào)度到該節(jié)點上
[root@node-1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-1 Ready master 26h v1.15.1
node-2 Ready,SchedulingDisabled <none> 26h v1.14.1
node-3 Ready <none> 26h v1.14.1
查看node-2上的pods，pod都已經(jīng)遷移到其他node節(jié)點上
[root@node-1 ~]# kubectl get pods --all-namespaces -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default demo-7b86696648-6f22r 1/1 Running 0 30s 10.244.2.5 node-3 <none> <none>
default demo-7b86696648-fjmxn 1/1 Running 0 116m 10.244.2.2 node-3 <none> <none>
default demo-7b86696648-nwwxf 1/1 Running 0 116m 10.244.2.3 node-3 <none> <none>
kube-system coredns-5c98db65d4-cqbbl 1/1 Running 0 30s 10.244.0.6 node-1 <none> <none>
kube-system coredns-5c98db65d4-g59qt 1/1 Running 2 28m 10.244.2.4 node-3 <none> <none>
kube-system etcd-node-1 1/1 Running 0 13m 10.254.100.101 node-1 <none> <none>
kube-system kube-apiserver-node-1 1/1 Running 0 13m 10.254.100.101 node-1 <none> <none>
kube-system kube-controller-manager-node-1 1/1 Running 0 13m 10.254.100.101 node-1 <none> <none>
kube-system kube-flannel-ds-amd64-99tjl 1/1 Running 1 26h 10.254.100.101 node-1 <none> <none>
kube-system kube-flannel-ds-amd64-jp594 1/1 Running 0 26h 10.254.100.103 node-3 <none> <none>
kube-system kube-flannel-ds-amd64-tm6wj 1/1 Running 0 26h 10.254.100.102 node-2 <none> <none>
kube-system kube-proxy-2wqhj 1/1 Running 0 28m 10.254.100.102 node-2 <none> <none>
kube-system kube-proxy-k7c4f 1/1 Running 1 27m 10.254.100.101 node-1 <none> <none>
kube-system kube-proxy-zffgq 1/1 Running 0 28m 10.254.100.103 node-3 <none> <none>
kube-system kube-scheduler-node-1 1/1 Running 0 13m 10.254.100.101 node-1 <none> <none>3、升級worker節(jié)點
[root@node-2 ~]# kubeadm upgrade node
[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[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" 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.4、重啟kubelet服務
[root@node-2 ~]# systemctl daemon-reload
[root@node-2 ~]# systemctl restart kubelet5、取消節(jié)點調(diào)度標志，確保worker節(jié)點可正常調(diào)度
[root@node-1 ~]# kubectl uncordon node-2
node/node-2 uncordoned
[root@node-1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-1 Ready master 27h v1.15.1
node-2 Ready <none> 27h v1.15.1 #已升級成功
node-3 Ready <none> 27h v1.14.1按照上述步驟升級node-3節(jié)點，如下是升級完成后所有節(jié)點版本狀態(tài)：
[root@node-1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-1 Ready master 27h v1.15.1
node-2 Ready <none> 27h v1.15.1
node-3 Ready <none> 27h v1.15.11、kubeadm upgrade apply執(zhí)行動作
2、kubeadm upgrade node執(zhí)行動作
截止至2019.9.15，當前kubernetes社區(qū)最新版本是1.15.3，本文演示以在線的方式升級kubernetes集群至1.15.3版本，步驟和前文操作類似。
1、安裝最新軟件包，kubeadm，kubelet，kubectl,三個節(jié)點均需要安裝
[root@node-1 ~]# yum install kubeadm kubectl kubelet
已加載插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
正在解決依賴關(guān)系
--> 正在檢查事務
---> 軟件包 kubeadm.x86_64.0.1.15.1-0 將被 升級
---> 軟件包 kubeadm.x86_64.0.1.15.3-0 將被 更新
---> 軟件包 kubectl.x86_64.0.1.15.1-0 將被 升級
---> 軟件包 kubectl.x86_64.0.1.15.3-0 將被 更新
---> 軟件包 kubelet.x86_64.0.1.15.1-0 將被 升級
---> 軟件包 kubelet.x86_64.0.1.15.3-0 將被 更新
--> 解決依賴關(guān)系完成
依賴關(guān)系解決
========================================================================================================================================================================
Package 架構(gòu) 版本 源 大小
========================================================================================================================================================================
正在更新:
kubeadm x86_64 1.15.3-0 kubernetes 8.9 M
kubectl x86_64 1.15.3-0 kubernetes 9.5 M
kubelet x86_64 1.15.3-0 kubernetes 22 M
事務概要
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升級 3 軟件包2、升級master節(jié)點
查看升級計劃
[root@node-1 ~]# 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: v1.15.1
[upgrade/versions] kubeadm version: v1.15.3
[upgrade/versions] Latest stable version: v1.15.3
[upgrade/versions] Latest version in the v1.15 series: v1.15.3
Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT CURRENT AVAILABLE
Kubelet 3 x v1.15.1 v1.15.3
Upgrade to the latest version in the v1.15 series:
COMPONENT CURRENT AVAILABLE
API Server v1.15.1 v1.15.3
Controller Manager v1.15.1 v1.15.3
Scheduler v1.15.1 v1.15.3
Kube Proxy v1.15.1 v1.15.3
CoreDNS 1.3.1 1.3.1
Etcd 3.3.10 3.3.10
You can now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.15.3
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升級master節(jié)點
[root@node-1 ~]# kubeadm upgrade apply v1.15.33、升級worker節(jié)點,以此升級node-2和node-3節(jié)點
設置五污點去驅(qū)逐
[root@node-1 ~]# kubectl drain node-2 --ignore-daemonsets
執(zhí)行升級操作
[root@node-2 ~]# kubeadm upgrade node
[root@node-2 ~]# systemctl daemon-reload
[root@node-2 ~]# systemctl restart kubelet
取消調(diào)度標志位
[root@node-1 ~]# kubectl uncordon node-2
node/node-2 uncordoned
確認版本升級
[root@node-1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-1 Ready master 27h v1.15.3
node-2 Ready <none> 27h v1.15.3
node-3 Ready <none> 27h v1.15.14、所有節(jié)點升級后的狀態(tài)
所有node狀態(tài)
[root@node-1 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-1 Ready master 27h v1.15.3
node-2 Ready <none> 27h v1.15.3
node-3 Ready <none> 27h v1.15.3
查看組件狀態(tài)
[root@node-1 ~]# kubectl get componentstatuses
NAME STATUS MESSAGE ERROR
scheduler Healthy ok
controller-manager Healthy ok
etcd-0 Healthy {"health":"true"}
查看應用狀態(tài)
[root@node-1 ~]# kubectl get deployments --all-namespaces
NAMESPACE NAME READY UP-TO-DATE AVAILABLE AGE
default demo 3/3 3 3 160m
kube-system coredns 2/2 2 2 27h
查看DaemonSets狀態(tài)
[root@node-1 ~]# kubectl get daemonsets --all-namespaces
NAMESPACE NAME DESIRED CURRENT READY UP-TO-DATE AVAILABLE NODE SELECTOR AGE
kube-system kube-flannel-ds-amd64 3 3 3 3 3 beta.kubernetes.io/arch=amd64 27h
kube-system kube-proxy 3 3 3 3 3 beta.kubernetes.io/os=linux 27h看完上述內(nèi)容，你們對kubernetes的 升級更新有進一步的了解嗎？如果還想學到更多技能或想了解更多相關(guān)內(nèi)容，歡迎關(guān)注億速云行業(yè)資訊頻道，感謝各位的閱讀。
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