Upgrade Kubernetes Version with Kubeadm

  • Начинаем в маcтер ноды
  • Узнаем таргет версию на гитхабе и обновляем kubeadm на controlnode
 apt-mark unhold kubeadm && \
 apt-get update && apt-get install -y kubeadm=1.26.1-00 && \
 apt-mark hold kubeadm

Получаем сводную информацию до какой версии сможем обновиться. 

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: v1.25.0
[upgrade/versions] kubeadm version: v1.26.1
[upgrade/versions] Target version: v1.26.1
[upgrade/versions] Latest version in the v1.25 series: v1.25.6

W0120 20:38:43.075526   21295 configset.go:177] error unmarshaling configuration schema.GroupVersionKind{Group:"kubeproxy.config.k8s.io", Version:"v1alpha1", Kind:"KubeProxyConfiguration"}: strict decoding error: unknown field "udpIdleTimeout"
Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT   CURRENT       TARGET
kubelet     2 x v1.25.0   v1.25.6

Upgrade to the latest version in the v1.25 series:

COMPONENT                 CURRENT   TARGET
kube-apiserver            v1.25.0   v1.25.6
kube-controller-manager   v1.25.0   v1.25.6
kube-scheduler            v1.25.0   v1.25.6
kube-proxy                v1.25.0   v1.25.6
CoreDNS                   v1.9.3    v1.9.3
etcd                      3.5.4-0   3.5.6-0

You can now apply the upgrade by executing the following command:

        kubeadm upgrade apply v1.25.6

_____________________________________________________________________

Components that must be upgraded manually after you have upgraded the control plane with 'kubeadm upgrade apply':
COMPONENT   CURRENT       TARGET
kubelet     2 x v1.25.0   v1.26.1

Upgrade to the latest stable version:

COMPONENT                 CURRENT   TARGET
kube-apiserver            v1.25.0   v1.26.1
kube-controller-manager   v1.25.0   v1.26.1
kube-scheduler            v1.25.0   v1.26.1
kube-proxy                v1.25.0   v1.26.1
CoreDNS                   v1.9.3    v1.9.3
etcd                      3.5.4-0   3.5.6-0

You can now apply the upgrade by executing the following command:

        kubeadm upgrade apply v1.26.1

_____________________________________________________________________


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
_____________________________________________________________________

Драйним ноду(Заставляем все приложения перейти на другую ноду)(этого делать не нужно если там не было приложений)

k drain controlplane --ignore-daemonsets

Запускаем обновление кластера

sudo kubeadm upgrade apply v1.26.x

Далее обновляем kublet and kubectl and restart

apt-mark unhold kubelet kubectl && \
apt-get update && apt-get install -y kubelet=1.26.х-00 kubectl=1.26.х-00 && \
apt-mark hold kubelet kubectl
sudo systemctl daemon-reload
sudo systemctl restart kubelet

Разкордование нашу мастер ноду (этого делать не нужно если там не было приложений)

k uncordon controlplane

Обновляем ноду

 apt-mark unhold kubelet kubectl && \
apt-get update && apt-get install -y kubelet=1.26.0-00 kubectl=1.26.0-00 && \
apt-mark hold kubelet kubectl
sudo systemctl daemon-reload
sudo systemctl restart kubelet
k uncordon node01
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