#!/bin/bash
set -e

# Download Node Exporter
DOWNLOAD_URL="http://s3.cloudyun.top/relayx/node_exporter-1.10.2.linux-amd64.tar.gz"
echo "Downloading Node Exporter..."
wget "$DOWNLOAD_URL" -O /tmp/node_exporter.tar.gz

# Extract
echo "Extracting Node Exporter..."
tar -zxvf /tmp/node_exporter.tar.gz -C /tmp

# Copy to /node_exporter
echo "Copying Node Exporter to /node_exporter..."
sudo cp -r /tmp/node_exporter-1.10.2.linux-amd64 /node_exporter

# Create systemd service file
SERVICE_FILE="/etc/systemd/system/node_exporter.service"

echo "Creating systemd service file..."
sudo tee "$SERVICE_FILE" > /dev/null <<EOF
[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=root
ExecStart=/node_exporter/node_exporter --web.listen-address=":9100"
Restart=always

[Install]
WantedBy=multi-user.target
EOF

# Reload systemd, enable and start service
echo "Enabling and starting node_exporter service..."
sudo systemctl daemon-reload
sudo systemctl enable --now node_exporter.service

echo "Node Exporter installation completed, listening on port 9100"