#!/bin/bash
# Script to properly join node3 to existing K3s etcd cluster
# Run this script ON node3

set -e

echo "=== Adding node3 to existing K3s etcd cluster ==="

# Step 1: Stop K3s and clean up
echo "Stopping K3s and cleaning up..."
sudo systemctl stop k3s || true
sudo systemctl stop k3s-agent || true

# Remove server data to prevent conflicts
echo "Cleaning up previous server data..."
sudo rm -rf /var/lib/rancher/k3s/server

# Step 2: Get the token from an existing server
echo ""
echo "You need to get the cluster token from node1 or node2."
echo "On node1 or node2, run:"
echo "  sudo cat /var/lib/rancher/k3s/server/token"
echo ""
read -p "Enter the K3s cluster token: " K3S_TOKEN

# Step 3: Create proper K3s configuration for joining existing cluster
echo "Creating K3s configuration..."
sudo mkdir -p /etc/rancher/k3s

# Important: We need to specify this is joining an existing cluster
cat << EOF | sudo tee /etc/rancher/k3s/config.yaml
# Join existing cluster - do not initialize new one
server: "https://10.0.101.21:6443"
token: "${K3S_TOKEN}"

# Additional configuration
tls-san:
  - "10.0.101.23"
  - "node3"
  
node-ip: "10.0.101.23"
EOF

# Step 4: Uninstall K3s agent if it exists
if [ -f /usr/local/bin/k3s-agent-uninstall.sh ]; then
    echo "Uninstalling K3s agent..."
    sudo /usr/local/bin/k3s-agent-uninstall.sh
fi

# Step 5: Install K3s as server joining the existing cluster
echo "Installing K3s as server (joining existing cluster)..."
curl -sfL https://get.k3s.io | sh -s - server \
    --server https://10.0.101.21:6443 \
    --token "${K3S_TOKEN}"

# Step 6: Wait for services to start
echo "Waiting for K3s to start..."
sleep 20

# Step 7: Check status
echo "Checking K3s status..."
sudo systemctl status k3s --no-pager || true
sudo journalctl -u k3s -n 50 --no-pager

echo ""
echo "=== Setup complete ==="
echo "If you see errors about etcd already being initialized, that's expected."
echo "Check from your local machine with:"
echo "  kubectl get nodes"
echo ""
echo "The node should now show roles: control-plane,etcd,master"
echo ""
echo "To check etcd cluster members from node1:"
echo "  sudo k3s etcdctl member list"