Install cluster from the scratch

# Add rpm package
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF

# Set SELinux in permissive mode (effectively disabling it)
setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

# Install kubeadm
sudo yum install -y kubelet kubeadm kubectl
sudo systemctl enable --now kubelet

# Make sure that bridge-nf-call-iptables is 1
sysctl net.bridge.bridge-nf-call-iptables # must be 1 (to fix it, run: sysctl net.bridge.bridge-nf-call-iptables=1)

# Create cluster
sudo kubeadm init --pod-network-cidr=192.168.0.0/16

# In logs, remember the command for adding new nodes
kubeadm join 10.68.108.57:6443 --token r5cw8c.spqdyu7myyjslr2i \
    --discovery-token-ca-cert-hash sha256:dfa1bb016c435d3cc777fa3bf909a70b27ff1e1c1f1cb45b65ac7835dc4ebcf9

# Copy admin config to ~.kube directory
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

# Add network plugin
# Calico:
kubectl apply -f https://docs.projectcalico.org/v3.11/manifests/calico.yaml
# or Weave:
kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

# Allow master node to host developer pods
kubectl taint nodes --all node-role.kubernetes.io/master-

# Allow k8s to pull images from a private repository
kubectl create secret docker-registry myregistrykey --docker-server=https://index.docker.io/v1/ --docker-username=mitrakov --docker-password=12345

# Check it
kubectl get pods --all-namespaces