How to completely uninstall kubernetes & install kubeadm, kubelet, kubectl

ubuntu 16.04 환경

kubernetes를 완전히 지우기

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

 

kubeadm, kubelet, kubectl 설치하기

# Disable Swap
sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
sudo swapoff -a

# Letting iptables see bridged traffic
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system

# Disable firewalld
sudo systemctl stop firewalld
sudo systemctl disable firewalld


# Installing kubeadm, kubelet and kubectl
sudo apt update
sudo apt -y install curl apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list

sudo apt update
sudo apt -y install vim git curl wget kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl

kubectl version --client && kubeadm version

 

Master Cluster 환경 구축

swapoff -a
kubeadm init --pod-network-cidr=10.244.0.0/16 --ignore-preflight-errors=NumCPU --v=4

mkdir -p $HOME/.kube
cp /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config

sysctl net.bridge.bridge-nf-call-iptables=1
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml