Deleting a Kubernetes Cluster

To delete you Kubernetes cluster, just click on the Delete Cluster menu option. The cluster will then shut down and all the cluster components will be removed. For Nirmata managed Host Groups, the cloud instances will automatically be deleted for you. For Direct Connect Host Groups, you can manually delete your VMs once the cluster is deleted.

Note: It is not recommended to reuse the VMs/Hosts to deploy another cluster to avoid any installation related to settings that remain on the VMs (e.g. data, NAT rules, etc.). You should shut down the VMs and deploy new VMs for your cluster.

To manually cleanup your hosts/VMs, run these commands on each host :

# Stop and remove any running containers
sudo docker stop $(sudo docker ps | grep “flannel” | gawk '{print $1}')
sudo docker stop $(sudo docker ps | grep "nirmata" | gawk '{print $1}')

sudo docker stop $(sudo docker ps | grep "kube" | gawk '{print $1}')
sudo docker rm  $(sudo docker ps -a | grep "Exit" |gawk '{print $1}')

# Remove any cni plugins
sudo rm -rf /etc/cni/*
sudo rm -rf /opt/cni/*

# Clear IP Tables
sudo iptables --flush
sudo iptables -tnat --flush

# Restart Docker
sudo systemctl stop docker
sudo systemctl start docker
sudo docker ps

# Deletes the CNI interface
sudo ifconfig cni0 down
sudo brctl delbr cni0
sudo ifconfig flannel.1 down
sudo ifconfig flannel.4096 down
sudo ifconfig kube-bridge down
sudo ip link delete cni0
sudo ip link delete flannel.1
sudo ip link delete flannel.4096
sudo ip link delete kube-bridge

# Remove cluster database
sudo rm -rf /data