CKS 2021更新第11期：强化你的Kubernetes集群——轻松进行升级指南
最编程
2024-02-22 22:46:42
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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 v1.20.1
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.deb
root@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: v1.20.6
Components 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 v1.20.6
1 x v1.20.2 v1.20.6
Upgrade 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 3.4.13-0
You can now apply the upgrade by executing the following command:
kubeadm upgrade apply v1.20.6
Note: Before you can perform this upgrade, you have to update kubeadm to v1.20.6.
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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 v1.20.1
root@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