How to completely uninstall kubernetes

Question

I installed kubernetes cluster using kubeadm following this guide. After some period of time, I decided to reinstall K8s but run into troubles with removing all related files and not finding any docs on official site how to remove cluster installed via kubeadm. Did somebody meet the same problems and know the proper way of removing all files and dependencies? Thank you in advance.

For more information, I removed kubeadm, kubectl and kubelet using apt-get purge/remove but when I started installing the cluster again I got next errors:

[preflight] Some fatal errors occurred:
    Port 6443 is in use
    Port 10251 is in use
    Port 10252 is in use
    /etc/kubernetes/manifests is not empty
    /var/lib/kubelet is not empty
    Port 2379 is in use
    /var/lib/etcd is not empty

Answer 1

use kubeadm reset command. this will un-configure the kubernetes cluster.

Answer 2

In my "Ubuntu 16.04", I use next steps to completely remove and clean Kubernetes (installed with "apt-get"):

kubeadm reset
sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube*   
sudo apt-get autoremove  
sudo rm -rf ~/.kube

And restart the computer.

Answer 3

kubeadm reset 
/*On Debian base Operating systems you can use the following command.*/
# on debian base 
sudo apt-get purge kubeadm kubectl kubelet kubernetes-cni kube* 


/*On CentOs distribution systems you can use the following command.*/
#on centos base
sudo yum remove kubeadm kubectl kubelet kubernetes-cni kube*


# on debian base
sudo apt-get autoremove

#on centos base
sudo yum autoremove

/For all/
sudo rm -rf ~/.kube

Answer 4

If you are clearing the cluster so that you can start again, then, in addition to what @rib47 said, I also do the following to ensure my systems are in a state ready for kubeadm init again:

kubeadm reset -f
rm -rf /etc/cni /etc/kubernetes /var/lib/dockershim /var/lib/etcd /var/lib/kubelet /var/run/kubernetes ~/.kube/*
iptables -F && iptables -X
iptables -t nat -F && iptables -t nat -X
iptables -t raw -F && iptables -t raw -X
iptables -t mangle -F && iptables -t mangle -X
systemctl restart docker

You then need to re-install docker.io, kubeadm, kubectl, and kubelet to make sure they are at the latest versions for your distribution before you re-initialize the cluster.

EDIT: Discovered that calico adds firewall rules to the raw table so that needs clearing out as well.

Answer 5

The guide you linked now has a Tear Down section:

Talking to the master with the appropriate credentials, run:

kubectl drain <node name> --delete-local-data --force --ignore-daemonsets
kubectl delete node <node name>

Then, on the node being removed, reset all kubeadm installed state:

kubeadm reset

Answer 6

I use the following scripts to completely uninstall an existing Kubernetes cluster and its running docker containers

sudo kubeadm reset

sudo apt purge kubectl kubeadm kubelet kubernetes-cni -y
sudo apt autoremove
sudo rm -fr /etc/kubernetes/; sudo rm -fr ~/.kube/; sudo rm -fr /var/lib/etcd; sudo rm -rf /var/lib/cni/

sudo systemctl daemon-reload

sudo iptables -F && sudo iptables -t nat -F && sudo iptables -t mangle -F && sudo iptables -X

# remove all running docker containers
docker rm -f `docker ps -a | grep "k8s_" | awk '{print $1}'`