docker-images/_sys/README.md

Upgrade:

export KV=1.26.0-00;
apt-mark unhold kubeadm=$KV kubectl=$KV kubelet=$KV;
apt install -y kubeadm=$KV;

kubeadm upgrade node #Other pines in the wood

#pine01
kubeadm upgrade plan --ignore-preflight-errors=CoreDNSUnsupportedPlugins;
kubeadm config images pull;
kubeadm upgrade apply ${KV/\-*/} --ignore-preflight-errors=CoreDNSUnsupportedPlugins --certificate-renewal=false; #sometimes true

apt install kubectl=$KV kubelet=$KV;
systemctl daemon-reload && systemctl restart kubelet;
apt-mark hold kubeadm=$KV kubectl=$KV kubelet=$KV;
echo 'You can now uncordon, der Geraet'; 

Infos:

$ kubectl -n kube-system get cm kubeadm-config -o yaml
apiVersion: v1
data:
  ClusterConfiguration: |
    apiServer:
      extraArgs:
        authorization-mode: Node,RBAC
      timeoutForControlPlane: 4m0s
    apiVersion: kubeadm.k8s.io/v1beta3
    certificatesDir: /etc/kubernetes/pki
    clusterName: kubernetes
    controllerManager: {}
    dns: {}
    etcd:
      local:
        dataDir: /var/lib/etcd
    imageRepository: registry.k8s.io
    kind: ClusterConfiguration
    kubernetesVersion: v1.23.15
    networking:
      dnsDomain: cluster.local
      podSubnet: 172.23.0.0/16
      serviceSubnet: 10.96.0.0/12
    scheduler: {}
  ClusterStatus: |
    apiEndpoints:
      pine01:
        advertiseAddress: 172.16.23.21
        bindPort: 6443
    apiVersion: kubeadm.k8s.io/v1beta2
    kind: ClusterStatus
kind: ConfigMap
metadata:
  creationTimestamp: "2021-01-20T14:55:12Z"
  managedFields:
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:data:
        .: {}
        f:ClusterConfiguration: {}
        f:ClusterStatus: {}
    manager: kubeadm
    operation: Update
    time: "2021-01-20T14:55:12Z"
  name: kubeadm-config
  namespace: kube-system
  resourceVersion: "441685033"
  uid: c70fefd3-02c3-44c8-a37d-7b17ec445455

Descheduler (reschedule pods)

https://github.com/kubernetes-sigs/descheduler

kubectl apply -n kube-system -f https://raw.githubusercontent.com/kubernetes-sigs/descheduler/master/kubernetes/base/rbac.yaml

kubectl apply -n kube-system -f https://raw.githubusercontent.com/kubernetes-sigs/descheduler/master/kubernetes/base/configmap.yaml

kubectl apply -n kube-system -f https://raw.githubusercontent.com/kubernetes-sigs/descheduler/master/kubernetes/job/job.yaml