本文的kubernetes环境:https://blog.51cto.com/billy98/2350660
本文章介绍如何将使用kubeadm创建的Kubernetes集群从版本1.13.x升级到版本1.14.x。
只能从一个MINOR版本升级到下一个MINOR版本,或者在同一个MINOR的PATCH版本之间升级。也就是说,升级时不能跳过MINOR版本。例如,可以从1.y升级到1.y + 1,但不能从1.y升级到1.y + 2。
升级工作流程如下:
当前kubernetes版本信息:
[root@node-01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-01 Ready master 99d v1.13.3
node-02 Ready master 99d v1.13.3
node-03 Ready master 99d v1.13.3
node-04 Ready <none> 99d v1.13.3
node-05 Ready <none> 99d v1.13.3
node-06 Ready <none> 99d v1.13.3
yum install kubeadm-1.14.1 -y
kubeadm version
此命令检查您的群集是否可以升级,并获取可以升级到的版本
,您应该看到与此类似的输出:
[root@node-01 ~]# 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: v1.13.3
[upgrade/versions] kubeadm version: v1.14.1
I0505 13:55:58.449783 12871 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)
I0505 13:55:58.449867 12871 version.go:97] falling back to the local client version: v1.14.1
[upgrade/versions] Latest stable version: v1.14.1
I0505 13:56:08.645796 12871 version.go:96] could not fetch a Kubernetes version from the internet: unable to get URL "https://dl.k8s.io/release/stable-1.13.txt": Get https://dl.k8s.io/release/stable-1.13.txt: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
I0505 13:56:08.645861 12871 version.go:97] falling back to the local client version: v1.14.1
[upgrade/versions] Latest version in the v1.13 series: v1.14.1
Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT CURRENT AVAILABLE
Kubelet 6 x v1.13.3 v1.14.1
Upgrade to the latest version in the v1.13 series:
COMPONENT CURRENT AVAILABLE
API Server v1.13.3 v1.14.1
Controller Manager v1.13.3 v1.14.1
Scheduler v1.13.3 v1.14.1
Kube Proxy v1.13.3 v1.14.1
CoreDNS 1.2.6 1.3.1
Etcd 3.2.24 3.3.10
You can now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.14.1
_____________________________________________________________________
kubeadm upgrade apply v1.14.1
你应该看到与此类似的输出
[root@node-01 ~]# kubeadm upgrade apply v1.14.1
[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/version] You have chosen to change the cluster version to "v1.14.1"
[upgrade/versions] Cluster version: v1.13.3
[upgrade/versions] kubeadm version: v1.14.1
[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 etcd]
[upgrade/prepull] Prepulling image for component etcd.
[upgrade/prepull] Prepulling image for component kube-apiserver.
[upgrade/prepull] Prepulling image for component kube-scheduler.
[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-scheduler
[apiclient] Found 0 Pods for label selector k8s-app=upgrade-prepull-etcd
[apiclient] Found 1 Pods for label selector k8s-app=upgrade-prepull-kube-controller-manager
[apiclient] Found 3 Pods for label selector k8s-app=upgrade-prepull-kube-apiserver
[apiclient] Found 3 Pods for label selector k8s-app=upgrade-prepull-kube-scheduler
[apiclient] Found 3 Pods for label selector k8s-app=upgrade-prepull-etcd
[apiclient] Found 3 Pods for label selector k8s-app=upgrade-prepull-kube-controller-manager
[upgrade/prepull] Prepulled image for component kube-scheduler.
[upgrade/prepull] Prepulled image for component kube-apiserver.
[upgrade/prepull] Prepulled image for component etcd.
[upgrade/prepull] Prepulled image for component kube-controller-manager.
[upgrade/prepull] Successfully prepulled the images for all the control plane components
[upgrade/apply] Upgrading your Static Pod-hosted control plane to version "v1.14.1"...
Static pod: kube-apiserver-node-01 hash: 26d86add2bfd0fd6825f5507fff1fb5e
Static pod: kube-controller-manager-node-01 hash: 21ea3d3ccb8d8dc00056209ca3da698b
Static pod: kube-scheduler-node-01 hash: a8d928943d47ec793a700ef95c4b6b4a
[upgrade/etcd] Upgrading to TLS for etcd
Static pod: etcd-node-01 hash: 35015766b0b1714f398bed77aae5be95
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/etcd.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2019-05-05-14-00-02/etcd.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: etcd-node-01 hash: 35015766b0b1714f398bed77aae5be95
Static pod: etcd-node-01 hash: 35015766b0b1714f398bed77aae5be95
Static pod: etcd-node-01 hash: 17ddbcfb2ddf1d447ceec2b52c9faa96
[apiclient] Found 3 Pods for label selector component=etcd
[upgrade/staticpods] Component "etcd" upgraded successfully!
[upgrade/etcd] Waiting for etcd to become available
[upgrade/staticpods] Writing new Static Pod manifests to "/etc/kubernetes/tmp/kubeadm-upgraded-manifests940835611"
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-apiserver.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2019-05-05-14-00-02/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-01 hash: 26d86add2bfd0fd6825f5507fff1fb5e
Static pod: kube-apiserver-node-01 hash: ff2267bcddb83b815efb49ff766ad897
[apiclient] Found 3 Pods for label selector component=kube-apiserver
[upgrade/staticpods] Component "kube-apiserver" upgraded successfully!
[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-2019-05-05-14-00-02/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-01 hash: 21ea3d3ccb8d8dc00056209ca3da698b
Static pod: kube-controller-manager-node-01 hash: ff8be061048a4660a1fbbf72db229d0d
[apiclient] Found 3 Pods for label selector component=kube-controller-manager
[upgrade/staticpods] Component "kube-controller-manager" upgraded successfully!
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-scheduler.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2019-05-05-14-00-02/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-01 hash: a8d928943d47ec793a700ef95c4b6b4a
Static pod: kube-scheduler-node-01 hash: 959a5cdf1468825401daa8d35329351e
[apiclient] Found 3 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-1.14" in namespace kube-system with the configuration for the kubelets in the cluster
[kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.14" 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
[endpoint] WARNING: port specified in controlPlaneEndpoint overrides bindPort in the controlplane address
[addons] Applied essential addon: kube-proxy
[upgrade/successful] SUCCESS! Your cluster was upgraded to "v1.14.1". Enjoy!
[upgrade/kubelet] Now that your control plane is upgraded, please proceed with upgrading your kubelets if you haven't already done so.
你的容器网络接口(CNI)提供商可能有自己的升级说明。检查插件页面以查找你的CNI提供商,并查看是否需要其他升级步骤。
yum install kubectl-1.14.1 kebulet-1.14.1 -y
重启kubelet
systemctl daemon-reload
systemctl restart kubelet
yum install kubeadm-1.14.1 -y
kubeadm upgrade node experimental-control-plane
你可以看到类似信息:
[root@node-02 ~]# kubeadm upgrade node experimental-control-plane
[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] Upgrading your Static Pod-hosted control plane instance to version "v1.14.1"...
Static pod: kube-apiserver-node-02 hash: 26d86add2bfd0fd6825f5507fff1fb5e
Static pod: kube-controller-manager-node-02 hash: 21ea3d3ccb8d8dc00056209ca3da698b
Static pod: kube-scheduler-node-02 hash: a8d928943d47ec793a700ef95c4b6b4a
[upgrade/etcd] Upgrading to TLS for etcd
Static pod: etcd-node-02 hash: 1aa55e50528bd0621c5734515b3265fd
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/etcd.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2019-05-05-14-10-46/etcd.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: etcd-node-02 hash: 1aa55e50528bd0621c5734515b3265fd
Static pod: etcd-node-02 hash: 1aa55e50528bd0621c5734515b3265fd
Static pod: etcd-node-02 hash: 4710a34897e7838519a1bf8fe4dccf07
[apiclient] Found 3 Pods for label selector component=etcd
[upgrade/staticpods] Component "etcd" upgraded successfully!
[upgrade/etcd] Waiting for etcd to become available
[upgrade/staticpods] Writing new Static Pod manifests to "/etc/kubernetes/tmp/kubeadm-upgraded-manifests483113569"
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-apiserver.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2019-05-05-14-10-46/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-02 hash: 26d86add2bfd0fd6825f5507fff1fb5e
Static pod: kube-apiserver-node-02 hash: fe1005f40c3f390280358921c3073223
[apiclient] Found 3 Pods for label selector component=kube-apiserver
[upgrade/staticpods] Component "kube-apiserver" upgraded successfully!
[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-2019-05-05-14-10-46/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-02 hash: 21ea3d3ccb8d8dc00056209ca3da698b
Static pod: kube-controller-manager-node-02 hash: ff8be061048a4660a1fbbf72db229d0d
[apiclient] Found 3 Pods for label selector component=kube-controller-manager
[upgrade/staticpods] Component "kube-controller-manager" upgraded successfully!
[upgrade/staticpods] Moved new manifest to "/etc/kubernetes/manifests/kube-scheduler.yaml" and backed up old manifest to "/etc/kubernetes/tmp/kubeadm-backup-manifests-2019-05-05-14-10-46/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-02 hash: a8d928943d47ec793a700ef95c4b6b4a
Static pod: kube-scheduler-node-02 hash: 959a5cdf1468825401daa8d35329351e
[apiclient] Found 3 Pods for label selector component=kube-scheduler
[upgrade/staticpods] Component "kube-scheduler" upgraded successfully!
[upgrade] The control plane instance for this node was successfully updated!
yum install kubectl-1.14.1 kebulet-1.14.1 -y
systemctl daemon-reload
systemctl restart kubelet
yum install -y kubeadm-1.14.1
通过将节点标记为不可调度并逐出pod来准备节点以进行维护(此步骤在master上执行)。
kubectl drain $NODE --ignore-daemonsets
[root@node-01 ~]# kubectl drain node-04 --ignore-daemonsets
node/node-04 already cordoned
WARNING: ignoring DaemonSet-managed Pods: cattle-system/cattle-node-agent-h655m, default/glusterfs-vhdqv, kube-system/canal-mbwvf, kube-system/kube-flannel-ds-amd64-zdfn8, kube-system/kube-proxy-5d64l
evicting pod "coredns-55696d4b79-kfcrh"
evicting pod "cattle-cluster-agent-66bd75c65f-k7p6n"
pod/cattle-cluster-agent-66bd75c65f-k7p6n evicted
pod/coredns-55696d4b79-kfcrh evicted
node/node-04 evicted
[root@node-04 ~]# kubeadm upgrade node config --kubelet-version v1.14.1
[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.
yum install kubectl-1.14.1 kebulet-1.14.1 -y
systemctl daemon-reload
systemctl restart kubelet
kubectl uncordon $NODE
其他work节点升级根据以上的步骤执行一遍即可。
在所有节点上升级kubelet之后,通过从kubectl可以访问群集的任何位置运行以下命令来验证所有节点是否可用:
[root@node-01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
node-01 Ready master 99d v1.14.1
node-02 Ready master 99d v1.14.1
node-03 Ready master 99d v1.14.1
node-04 Ready <none> 99d v1.14.1
node-05 Ready <none> 99d v1.14.1
node-06 Ready <none> 99d v1.14.1
该STATUS列所有节点应显示Ready,并且应更新版本号。
kubeadm upgrade apply 执行以下操作:
kubeadm upgrade node experimental-control-plane在其他控制平面节点上执行以下操作:
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