I have six desktop machines in my network and I want to build two Kubernetes clusters. Each machine has Ubuntu 16.04 LTS installed. Initially, all the machines were part of a single cluster. However, I removed three of the machines to setup another cluster, and executed the following command on each of these machine:
RESET COMMAND:
sudo kubeadm reset -f &&
sudo systemctl stop kubelet &&
sudo systemctl stop docker &&
sudo rm -rf /var/lib/cni/ &&
sudo rm -rf /var/lib/kubelet/* &&
sudo rm -rf /etc/cni/ &&
sudo ifconfig cni0 down &&
sudo ifconfig flannel.1 down &&
sudo ifconfig docker0 down &&
sudo ip link delete cni0 &&
sudo ip link delete flannel.1
After this I rebooted each machine, and proceeded with the setup of a new cluster, by setting up the master node:
INSTALL COMMAND:
sudo kubeadm init phase certs all &&
sudo kubeadm init phase kubeconfig all &&
sudo kubeadm init phase control-plane all --pod-network-cidr 10.244.0.0/16 &&
sudo sed -i 's/initialDelaySeconds: [0-9][0-9]/initialDelaySeconds: 240/g' /etc/kubernetes/manifests/kube-apiserver.yaml &&
sudo sed -i 's/failureThreshold: [0-9]/failureThreshold: 18/g' /etc/kubernetes/manifests/kube-apiserver.yaml &&
sudo sed -i 's/timeoutSeconds: [0-9][0-9]/timeoutSeconds: 20/g' /etc/kubernetes/manifests/kube-apiserver.yaml &&
sudo kubeadm init \
--v=1 \
--skip-phases=certs,kubeconfig,control-plane \
--ignore-preflight-errors=all \
--pod-network-cidr 10.244.0.0/16
After this I also installed flannel. After the master was successfully installed, I proceeded with the kubeadm join to add the other two machines. After these machines were added, I installed the NGINX-Ingress on the master node.
Now, I wanted to reset the cluster and to re-do this setup again. I reset each machine using the RESET COMMAND and proceeded with the INSTALL command on the master node. However, after I ran the INSTALL command and ran kubectl get pods --all-namespaces I can still see the pods from the previous installation:
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-fb8b8dccf-h5hhk 0/1 ContainerCreating 1 20h
kube-system coredns-fb8b8dccf-jblmv 0/1 ContainerCreating 1 20h
kube-system etcd-ubuntu6 1/1 Running 0 19h
kube-system kube-apiserver-ubuntu6 1/1 Running 0 76m
kube-system kube-controller-manager-ubuntu6 0/1 CrashLoopBackOff 7 75m
kube-system kube-flannel-ds-amd64-4pqq6 1/1 Running 0 20h
kube-system kube-flannel-ds-amd64-dvfmp 0/1 CrashLoopBackOff 7 20h
kube-system kube-flannel-ds-amd64-dz9st 1/1 Terminating 0 20h
kube-system kube-proxy-9vfjx 1/1 Running 0 20h
kube-system kube-proxy-q5c86 1/1 Running 0 20h
kube-system kube-proxy-zlw4v 1/1 Running 0 20h
kube-system kube-scheduler-ubuntu6 1/1 Running 0 76m
nginx-ingress nginx-ingress-6957586bf6-fg2tt 0/1 Terminating 22 19h
Why am I seeing the pods from the previous installation?
