Notes

##ETCD BACKUP

#Find directory of etcd daemon
sudo grep data-dir /etc/kubernetes/manifests/etcd.yaml
ex. - --data-dir=/var/lib/etcd

kubectl -n kube-system exec -it etcd-k8scp -- sh \   #Same as before-c "ETCDCTL_API=3 \    #Version to useETCDCTL_CACERT=/etc/kubernetes/pki/etcd/ca.crt \    #Pass the certificate authorityETCDCTL_CERT=/etc/kubernetes/pki/etcd/server.crt \    #Pass the peer cert and keyETCDCTL_KEY=/etc/kubernetes/pki/etcd/server.key \etcdctl endpoint health"     #The command to test the endpoint


#Upgrade cluster
install kubeadm=1.22.1-00
k drain master-node --ignore-daemonsets
sudo kubeadm upgrade plan
sudo kubeadm upgrade apply v1.22.1
k get node
apt-mark unhold kubelet kubectl
install kubelet=1.22.1-00 kubectl=1.22.1-00
apt-mark hold kubelet kubectl
systemctl daemon-reload
systemctl restart kubelet
k get node
k uncordon k8sscp
k get node


#On additional nodes i.e. worker
apt-mark unhold kubeadm
apt-get update apt get install -y kubeadm=1.22.1-00
sudo apt-mark hold kubeadm
k drain worker --ignore-daemonsets
sudo kubeadm upgrade node
sudo apt-mark unhold kubelet kubeadm
sudo apt-get install -y kubelet=1.22.1-00 kubectl=1.22.1-00
sudo apt-mark hold kubelet kubectl
sudo systemctl daemon-reload
sudo systemctl restart kubelet
k get node
k uncordon worker
k get nodes

#change namespace
kubectl config set-context ($kubectl config current-context) --namespace=default