文章目錄

• • 1. 介紹
  • 2. Practice - Create outdated cluster
  • 3. Upgrade master node
  • 4. Upgrade worker node

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1. 介紹

2. Practice - Create outdated cluster

參考鏈接：
https://github.com/killer-sh/cks-course-environment/tree/master/cluster-setup/previous

# master bash <(curl -s https://raw.githubusercontent.com/killer-sh/cks-course-environment/master/cluster-setup/previous/install_master.sh)# worker bash <(curl -s https://raw.githubusercontent.com/killer-sh/cks-course-environment/master/cluster-setup/previous/install_worker.sh)

3. Upgrade master node

root@master:~/cks/create_cluster# k drain master --ignore-daemonsets node/master cordoned WARNING: ignoring DaemonSet-managed Pods: kube-system/calico-node-ngbm8, kube-system/kube-proxy-lfkn9 node/master drained root@master:~/cks/create_cluster# k get node NAME STATUS ROLES AGE VERSION master Ready,SchedulingDisabled control-plane,master 42h v1.20.1 node1 Ready <none> 42h v1.20.1 node2 Ready <none> 42h v1.20.1root@master:~/cks/create_cluster# apt-cache show kubeadm |grep -e '1.20' Version: 1.20.2-00 Filename: pool/kubeadm_1.20.2-00_amd64_38fa4593055ef1161d4cb322437eedda95186fb850819421b8cf75f3a943dc51.deb Version: 1.20.1-00 Filename: pool/kubeadm_1.20.1-00_amd64_7cd8d4021bb251862b755ed9c240091a532b89e6c796d58c3fdea7c9a72b878f.deb Version: 1.20.0-00 Filename: pool/kubeadm_1.20.0-00_amd64_18afc5e3855cf5aaef0dbdfd1b3304f9e8e571b3c4e43b5dc97c439d62a3321a.debroot@master:~/cks/create_cluster# apt-get install kubeadm=1.20.2-00 kubectl=1.20.2-00 kubelet=1.20.2-00 Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required:rename Use 'sudo apt autoremove' to remove it. The following packages will be upgraded:kubeadm kubectl kubelet 3 upgraded, 0 newly installed, 0 to remove and 146 not upgraded. Need to get 34.5 MB of archives. After this operation, 32.8 kB of additional disk space will be used. Get:1 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubelet amd64 1.20.2-00 [18.9 MB] Get:2 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubectl amd64 1.20.2-00 [7,940 kB] Get:3 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubeadm amd64 1.20.2-00 [7,706 kB] Fetched 34.5 MB in 7s (4,914 kB/s) (Reading database ... 110090 files and directories currently installed.) Preparing to unpack .../kubelet_1.20.2-00_amd64.deb ... Unpacking kubelet (1.20.2-00) over (1.20.1-00) ... Preparing to unpack .../kubectl_1.20.2-00_amd64.deb ... Unpacking kubectl (1.20.2-00) over (1.20.0-00) ... Preparing to unpack .../kubeadm_1.20.2-00_amd64.deb ... Unpacking kubeadm (1.20.2-00) over (1.20.0-00) ... Setting up kubelet (1.20.2-00) ... Setting up kubectl (1.20.2-00) ... Setting up kubeadm (1.20.2-00) ...root@master:~/cks/create_cluster# 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 -o yaml' [preflight] Running pre-flight checks. [upgrade] Running cluster health checks [upgrade] Fetching available versions to upgrade to [upgrade/versions] Cluster version: v1.20.0 [upgrade/versions] kubeadm version: v1.20.2 I0426 23:07:55.970280 68360 version.go:251] remote version is much newer: v1.21.0; falling back to: stable-1.20 [upgrade/versions] Latest stable version: v1.20.6 [upgrade/versions] Latest stable version: v1.20.6 [upgrade/versions] Latest version in the v1.20 series: v1.20.6 [upgrade/versions] Latest version in the v1.20 series: v1.20.6Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply': COMPONENT CURRENT AVAILABLE kubelet 2 x v1.20.1 v1.20.61 x v1.20.2 v1.20.6Upgrade to the latest version in the v1.20 series:COMPONENT CURRENT AVAILABLE kube-apiserver v1.20.0 v1.20.6 kube-controller-manager v1.20.0 v1.20.6 kube-scheduler v1.20.0 v1.20.6 kube-proxy v1.20.0 v1.20.6 CoreDNS 1.7.0 1.7.0 etcd 3.4.13-0 3.4.13-0You can now apply the upgrade by executing the following command:kubeadm upgrade apply v1.20.6Note: Before you can perform this upgrade, you have to update kubeadm to v1.20.6._____________________________________________________________________The table below shows the current state of component configs as understood by this version of kubeadm. Configs that have a "yes" mark in the "MANUAL UPGRADE REQUIRED" column require manual config upgrade or resetting to kubeadm defaults before a successful upgrade can be performed. The version to manually upgrade to is denoted in the "PREFERRED VERSION" column.API GROUP CURRENT VERSION PREFERRED VERSION MANUAL UPGRADE REQUIRED kubeproxy.config.k8s.io v1alpha1 v1alpha1 no kubelet.config.k8s.io v1beta1 v1beta1 no _____________________________________________________________________root@master:~/cks/create_cluster# kubeadm upgrade apply v1.20.6 root@master:~/cks/create_cluster# k get nodes NAME STATUS ROLES AGE VERSION master Ready,SchedulingDisabled control-plane,master 42h v1.20.2 node1 Ready <none> 42h v1.20.1 node2 Ready <none> 42h v1.20.1root@master:~/cks/create_cluster# k uncordon master node/master uncordoned root@master:~/cks/create_cluster# k get node NAME STATUS ROLES AGE VERSION master Ready control-plane,master 42h v1.20.2 node1 Ready <none> 42h v1.20.1 node2 Ready <none> 42h v1.20.1

4. Upgrade worker node

root@master:~/cks/create_cluster# k get node NAME STATUS ROLES AGE VERSION master Ready control-plane,master 42h v1.20.2 node1 Ready <none> 42h v1.20.1 node2 Ready <none> 42h v1.20.1root@master:~/cks/create_cluster# k drain node1 --ignore-daemonsets node/node1 already cordonedroot@master:~/cks/create_cluster# k uncordon node1 node/node1 uncordonedroot@node1:~# kubeadm version kubeadm version: &version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.0", GitCommit:"af46c47ce925f4c4ad5cc8d1fca46c7b77d13b38", GitTreeState:"clean", BuildDate:"2020-12-08T17:57:36Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}root@master:~/cks/create_cluster# apt-cache show kubeadm |grep -e '1.20' Version: 1.20.2-00 Filename: pool/kubeadm_1.20.2-00_amd64_38fa4593055ef1161d4cb322437eedda95186fb850819421b8cf75f3a943dc51.deb Version: 1.20.1-00 Filename: pool/kubeadm_1.20.1-00_amd64_7cd8d4021bb251862b755ed9c240091a532b89e6c796d58c3fdea7c9a72b878f.deb Version: 1.20.0-00 Filename: pool/kubeadm_1.20.0-00_amd64_18afc5e3855cf5aaef0dbdfd1b3304f9e8e571b3c4e43b5dc97c439d62a3321a.debroot@master:~/cks/create_cluster# apt-get install kubeadm=1.20.2-00 kubectl=1.20.2-00 kubelet=1.20.2-00 Reading package lists... Done Building dependency tree Reading state information... Done The following package was automatically installed and is no longer required:rename Use 'sudo apt autoremove' to remove it. The following packages will be upgraded:kubeadm kubectl kubelet 3 upgraded, 0 newly installed, 0 to remove and 146 not upgraded. Need to get 34.5 MB of archives. After this operation, 32.8 kB of additional disk space will be used. Get:1 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubelet amd64 1.20.2-00 [18.9 MB] Get:2 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubectl amd64 1.20.2-00 [7,940 kB] Get:3 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial/main amd64 kubeadm amd64 1.20.2-00 [7,706 kB] Fetched 34.5 MB in 7s (4,914 kB/s) (Reading database ... 110090 files and directories currently installed.) Preparing to unpack .../kubelet_1.20.2-00_amd64.deb ... Unpacking kubelet (1.20.2-00) over (1.20.1-00) ... Preparing to unpack .../kubectl_1.20.2-00_amd64.deb ... Unpacking kubectl (1.20.2-00) over (1.20.0-00) ... Preparing to unpack .../kubeadm_1.20.2-00_amd64.deb ... Unpacking kubeadm (1.20.2-00) over (1.20.0-00) ... Setting up kubelet (1.20.2-00) ... Setting up kubectl (1.20.2-00) ... Setting up kubeadm (1.20.2-00) ...root@node1:~# kubeadm version root@node1:~# kubectl version root@node1:~# kubelet version root@master:~/cks/create_cluster# k get node NAME STATUS ROLES AGE VERSION master Ready control-plane,master 42h v1.20.2 node1 Ready <none> 42h v1.20.2 node2 Ready <none> 42h v1.20.1 root@master:~/cks/create_cluster# k uncordon node1 node/node1 uncordoned

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