Automated shell script to install and configure Prometheus Node Exporter as a systemd service on Linux.

install_node_exporter.sh

#!/bin/bash

# Exit immediately if a command exits with a non-zero status
set -e

# 1. Define Version (Use argument if provided, otherwise default to 1.8.2)
DEFAULT_VERSION="1.10.2"
VERSION="${1:-$DEFAULT_VERSION}"

echo "------------------------------------------------"
echo "Starting Node Exporter Installation..."
echo "Target Version: v$VERSION"
echo "------------------------------------------------"

# 2. Create the Node Exporter user (Security)
# Check if user already exists to avoid errors
if id "node_exporter" &>/dev/null; then
    echo "User 'node_exporter' already exists. Skipping creation..."
else
    sudo useradd --no-create-home --shell /bin/false node_exporter
    echo "User 'node_exporter' created."
fi

# 3. Download and Extract
echo "Downloading node_exporter-$VERSION.linux-amd64.tar.gz..."
wget -q --show-progress https://github.com/prometheus/node_exporter/releases/download/v$VERSION/node_exporter-$VERSION.linux-amd64.tar.gz
tar xf node_exporter-$VERSION.linux-amd64.tar.gz

# 4. Move Binary and Set Permissions
echo "Installing binary to /usr/local/bin/..."
sudo cp node_exporter-$VERSION.linux-amd64/node_exporter /usr/local/bin/
sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter

# 5. Clean up downloaded files
rm -rf node_exporter-$VERSION.linux-amd64.tar.gz node_exporter-$VERSION.linux-amd64
echo "Cleaned up temporary files."

# 6. Create Systemd Service File
echo "Creating systemd service file..."
sudo bash -c 'cat <<EOF > /etc/systemd/system/node_exporter.service
[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

[Service]
User=node_exporter
Group=node_exporter
Type=simple
ExecStart=/usr/local/bin/node_exporter

[Install]
WantedBy=multi-user.target
EOF'

# 7. Start and Enable the Service
echo "Reloading daemon and starting service..."
sudo systemctl daemon-reload
sudo systemctl start node_exporter
sudo systemctl enable node_exporter

# 8. Check Status
echo "------------------------------------------------"
echo "Installation Complete (v$VERSION). Service Status:"
sudo systemctl status node_exporter --no-pager

Node Exporter Installer Script

A Bash script to automatically download, install, and configure Prometheus Node Exporter as a systemd service on Linux.

Features:

• Version Control: Installs v1.10.2 by default, or any specific version you provide.
• Security: Creates a dedicated node_exporter user with no shell access.
• Cleanup: Automatically removes tarballs and extracted folders after installation.
• Systemd Integration: Creates, enables, and starts the service automatically.

---

Usage

Method 1: One-Line Installation (via curl)

You can run the script directly from the raw Gist URL without saving the file.

Option A: Install Default Version (v1.10.2)

# Replace <GIST_RAW_URL> with your actual raw gist link
curl -sL <GIST_RAW_URL> | bash

Option B: Install Specific Version (e.g., v1.7.0)
Pass the version number as an argument using bash -s.

curl -sL <GIST_RAW_URL> | bash -s 1.7.0

---

Method 2: Manual Installation

1. Download the script:

   wget <GIST_RAW_URL> -O install_node_exporter.sh

2. Make it executable:

   chmod +x install_node_exporter.sh

3. Run the script:

   # Run with default version
   ./install_node_exporter.sh
   
   # OR run with a specific version
   ./install_node_exporter.sh 1.6.1

---

Verification

After installation, verify that Node Exporter is running and exposing metrics:

1. Check Service Status:

   systemctl status node_exporter

2. Check Metrics Endpoint:

   curl localhost:9100/metrics