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zailbreck/node_exporter_install.sh

Created June 3, 2025 03:31
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  1. zailbreck created this gist Jun 3, 2025.
    86 changes: 86 additions & 0 deletions node_exporter_install.sh
    View file
    Original file line number Diff line number Diff line change
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    #!/usr/bin/env bash

    # Exit if not run as root
    if [ "$EUID" -ne 0 ]; then
    echo "Please run as root (use sudo)."
    exit 1
    fi

    # Variables
    DOWNLOAD_URL="https://github.com/prometheus/node_exporter/releases/download/v1.9.1/node_exporter-1.9.1.linux-amd64.tar.gz"
    TAR_FILE="node_exporter-1.9.1.linux-amd64.tar.gz"
    EXTRACTED_DIR="node_exporter-1.9.1.linux-amd64"

    # Download file
    echo "Downloading Node Exporter..."
    curl -L -o "$TAR_FILE" "$DOWNLOAD_URL"
    if [ $? -ne 0 ]; then
    echo "Download failed. Exiting."
    exit 1
    fi

    # Remove old user and group if exists
    if id "node_exporter" &>/dev/null; then
    echo "User node_exporter exists, deleting..."
    userdel node_exporter
    fi
    groupadd -f node_exporter
    useradd -g node_exporter --no-create-home --shell /bin/false node_exporter

    # Create required directories
    mkdir -p /etc/node_exporter
    chown node_exporter:node_exporter /etc/node_exporter

    # Extract package
    tar -xzf "$TAR_FILE"
    if [ $? -ne 0 ]; then
    echo "Extraction failed. Exiting."
    exit 1
    fi

    # Install binary
    cp "$EXTRACTED_DIR/node_exporter" /usr/bin/
    chown node_exporter:node_exporter /usr/bin/node_exporter

    # Cleanup downloaded files and extracted folder
    echo "Cleaning up temporary files..."
    rm -f "$TAR_FILE"
    rm -rf "$EXTRACTED_DIR"

    # Create systemd service
    cat <<EOF > /etc/systemd/system/node_exporter.service
    [Unit]
    Description=Node Exporter
    Documentation=https://prometheus.io/docs/guides/node-exporter/
    Wants=network-online.target
    After=network-online.target
    [Service]
    User=node_exporter
    Group=node_exporter
    Type=simple
    Restart=on-failure
    ExecStart=/usr/bin/node_exporter --web.listen-address=:9100
    [Install]
    WantedBy=multi-user.target
    EOF

    # Reload systemd, enable and start service
    systemctl daemon-reload
    systemctl enable node_exporter
    systemctl start node_exporter

    # Verify service by checking HTTP status code
    echo "Verifying Node Exporter..."
    sleep 2
    STATUS_CODE=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:9100/metrics)

    if [ "$STATUS_CODE" -eq 200 ]; then
    echo "Node Exporter is running and reachable."
    else
    echo "Node Exporter verification failed. HTTP status code: $STATUS_CODE"
    exit 1
    fi

    echo "Installation completed successfully."