install-node-exporter.sh

install-node-exporter.sh

#!/bin/bash

set -e

NODE_EXPORTER_VERSION="1.8.0"
NODE_EXPORTER_USER="node_exporter"
NODE_EXPORTER_DIR="/opt/node_exporter"
TARBALL="node_exporter-${NODE_EXPORTER_VERSION}.linux-amd64.tar.gz"
URL="https://github.com/prometheus/node_exporter/releases/download/v${NODE_EXPORTER_VERSION}/${TARBALL}"

echo "Downloading node_exporter ${NODE_EXPORTER_VERSION}..."
curl -L -O "$URL"

echo "Extracting tarball..."
tar -xzf "$TARBALL"

echo "Moving binary to /usr/local/bin..."
sudo cp "node_exporter-${NODE_EXPORTER_VERSION}.linux-amd64/node_exporter" /usr/local/bin/
sudo chown root:root /usr/local/bin/node_exporter

echo "Creating node_exporter user if it doesn't exist..."
sudo useradd --no-create-home --shell /usr/sbin/nologin "$NODE_EXPORTER_USER" || true

echo "Creating systemd service..."
cat <<EOF | sudo tee /etc/systemd/system/node_exporter.service > /dev/null
[Unit]
Description=Node Exporter
Wants=network-online.target
After=network-online.target

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

[Install]
WantedBy=default.target
EOF

echo "Setting permissions..."
sudo mkdir -p "$NODE_EXPORTER_DIR"
sudo chown "$NODE_EXPORTER_USER":"$NODE_EXPORTER_USER" "$NODE_EXPORTER_DIR"

echo "Reloading systemd and starting node_exporter..."
sudo systemctl daemon-reexec
sudo systemctl daemon-reload
sudo systemctl enable --now node_exporter

echo "Installation complete. node_exporter should now be running on port 9100."