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

User · Answer

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.

User · Answer

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

User · Answer

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

User · Answer

The guide you linked now has a Tear Down section   Talking to the master with the appropriate credentials  run   kubectl drain  lt node name gt  --delete-local-data --force --ignore-daemonsets kubectl delete node  lt node name gt    Then  on the node being removed  reset all kubeadm installed state   kubeadm reset

User · Answer

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

[kubernetes] How to completely uninstall kubernetes

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