From a99c7acc39c4988436a1835d51e0c904125038a4 Mon Sep 17 00:00:00 2001
From: vijay <vijayjamesmani@gmail.com>
Date: Mon, 5 May 2025 02:17:46 +0000
Subject: [PATCH] Add install_node_exporter.sh

---
 install_node_exporter.sh | 133 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 install_node_exporter.sh

diff --git a/install_node_exporter.sh b/install_node_exporter.sh
new file mode 100644
index 0000000..86a15d6
--- /dev/null
+++ b/install_node_exporter.sh
@@ -0,0 +1,133 @@
+#!/bin/bash
+
+# Function to install node_exporter
+install_node_exporter() {
+    # Create a user for node_exporter
+    sudo useradd -rs /bin/false node_exporter
+    echo "User 'node_exporter' created."
+
+    # Create a directory for node_exporter
+    sudo mkdir -p /opt/node_exporter
+    echo "Directory '/opt/node_exporter' created."
+
+    # Move the downloaded binary to the appropriate directory
+    EXTRACTED_DIR="node_exporter-${LATEST_VERSION#v}.linux-amd64"
+    if [ -f "${EXTRACTED_DIR}/node_exporter" ]; then
+        sudo mv "${EXTRACTED_DIR}/node_exporter" /usr/local/bin/
+        echo "Node Exporter binary moved to /usr/local/bin."
+    else
+        echo "Node Exporter binary not found in the extracted directory."
+        exit 1
+    fi
+
+    # Set ownership and permissions
+    sudo chown node_exporter:node_exporter /usr/local/bin/node_exporter
+    echo "Ownership set for /usr/local/bin/node_exporter."
+
+    sudo chmod 755 /usr/local/bin/node_exporter
+    echo "Permissions set for /usr/local/bin/node_exporter."
+
+    # Create a systemd service file
+    cat <<EOF | sudo tee /etc/systemd/system/node_exporter.service
+[Unit]
+Description=Node Exporter
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=node_exporter
+ExecStart=/usr/local/bin/node_exporter
+Restart=on-failure
+
+[Install]
+WantedBy=default.target
+EOF
+    echo "Systemd service file created at /etc/systemd/system/node_exporter.service."
+
+    # Reload systemd to recognize the new service
+    sudo systemctl daemon-reload
+    echo "Systemd daemon reloaded."
+
+    # Start and enable the node_exporter service
+    sudo systemctl start node_exporter
+    if [ $? -eq 0 ]; then
+        echo "Node Exporter service started."
+    else
+        echo "Failed to start Node Exporter service."
+        exit 1
+    fi
+
+    sudo systemctl enable node_exporter
+    echo "Node Exporter service enabled to start on boot."
+
+    echo "Node Exporter installed and running as a service."
+}
+
+# Function to check the status of node_exporter service
+check_service_status() {
+    if systemctl is-active --quiet node_exporter; then
+        echo "Node Exporter service is active and running."
+        return 0
+    else
+        echo "Node Exporter service is not running."
+        echo "You can check the logs with: sudo journalctl -u node_exporter.service"
+        return 1
+    fi
+}
+
+# Identify the Linux distribution
+if [ -f /etc/os-release ]; then
+    . /etc/os-release
+    OS=$ID
+else
+    echo "Unsupported OS"
+    exit 1
+fi
+
+# Download the latest version of node_exporter
+LATEST_VERSION=$(curl -s https://api.github.com/repos/prometheus/node_exporter/releases/latest | grep -oP '"tag_name": "\K(.*)(?=")')
+DOWNLOAD_URL="https://github.com/prometheus/node_exporter/releases/download/${LATEST_VERSION}/node_exporter-${LATEST_VERSION#v}.linux-amd64.tar.gz"
+
+# Download node_exporter
+echo "Downloading Node Exporter version ${LATEST_VERSION}..."
+curl -LO ${DOWNLOAD_URL}
+
+# Check if the download was successful
+if [ $? -ne 0 ]; then
+    echo "Error downloading Node Exporter. Please check the URL."
+    exit 1
+fi
+# Check if the downloaded file exists
+if [ ! -f "node_exporter-${LATEST_VERSION#v}.linux-amd64.tar.gz" ]; then
+    echo "Downloaded file does not exist."
+    exit 1
+fi
+
+# Extract node_exporter
+tar -xzf node_exporter-${LATEST_VERSION#v}.linux-amd64.tar.gz
+if [ $? -eq 0 ]; then
+    echo "Node Exporter extracted successfully."
+else
+    echo "Error extracting Node Exporter. Please check the downloaded file."
+    exit 1
+fi
+
+# Install node_exporter
+install_node_exporter
+
+# Check the status of the node_exporter service
+if check_service_status; then
+    # Prompt for cleanup if the service is running
+    read -p "Node Exporter is running successfully. Do you want to clean up the downloaded files? (y/n): " cleanup_choice
+if [[ "$cleanup_choice" == "y" || "$cleanup_choice" == "Y" ]]; then
+        rm -rf node_exporter-${LATEST_VERSION#v}.linux-amd64.tar.gz
+        rm -rf node_exporter-${LATEST_VERSION#v}.linux-amd64
+        echo "Cleaned up downloaded files."
+    else
+        echo "Downloaded files retained."
+    fi
+else
+    echo "Node Exporter service is not running. Please check the logs for more information."
+fi
+
+echo "Script execution completed."