Automated script to install Tenable Nessus on both Linux (Ubuntu, RHEL, CentOS) and Windows

Here’s an automated script to install Tenable Nessus on both Linux (Ubuntu, RHEL, CentOS) and Windows.

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🔹 Automated Installation Script for Linux

This script detects your OS and installs Nessus accordingly.

📌 Steps to Use

1. Copy & paste the script into a file (install_nessus.sh).
2. Give execute permission: chmod +x install_nessus.sh
3. Run the script: sudo ./install_nessus.sh

🚀 Linux Installation Script

#!/bin/bash

# Detect Linux Distribution
if [ -f /etc/os-release ]; then
    . /etc/os-release
    OS=$ID
else
    echo "Unsupported Linux distribution"
    exit 1
fi

# Set Nessus Download URL
NESSUS_VERSION="10.5.0"
if [[ "$OS" == "ubuntu" || "$OS" == "debian" ]]; then
    FILE="Nessus-${NESSUS_VERSION}-ubuntu_amd64.deb"
    URL="https://downloads.nessus.org/nessus/${NESSUS_VERSION}/${FILE}"
    INSTALL_CMD="dpkg -i $FILE"
elif [[ "$OS" == "rhel" || "$OS" == "centos" || "$OS" == "amzn" ]]; then
    FILE="Nessus-${NESSUS_VERSION}-es8.x86_64.rpm"
    URL="https://downloads.nessus.org/nessus/${NESSUS_VERSION}/${FILE}"
    INSTALL_CMD="rpm -ivh $FILE"
else
    echo "Unsupported OS: $OS"
    exit 1
fi

# Download Nessus
echo "Downloading Nessus..."
curl -O $URL

# Install Nessus
echo "Installing Nessus..."
sudo $INSTALL_CMD

# Start and Enable Nessus Service
echo "Starting Nessus Service..."
sudo systemctl start nessusd
sudo systemctl enable nessusd

# Show Service Status
sudo systemctl status nessusd --no-pager

# Show Access URL
IP=$(hostname -I | awk '{print $1}')
echo "Nessus is installed. Access it at: https://$IP:8834"

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🔹 Automated Installation for Windows

📌 Steps to Use

1. Copy & paste the following script into PowerShell.
2. Save it as install_nessus.ps1.
3. Open PowerShell as Administrator and run: Set-ExecutionPolicy Bypass -Scope Process -Force .\install_nessus.ps1

🚀 Windows PowerShell Installation Script

# Define Nessus Version
$nessusVersion = "10.5.0"
$downloadUrl = "https://downloads.nessus.org/nessus/$nessusVersion/Nessus-$nessusVersion-x64.msi"
$installerPath = "$env:TEMP\NessusInstaller.msi"

# Download Nessus
Write-Host "Downloading Nessus..."
Invoke-WebRequest -Uri $downloadUrl -OutFile $installerPath

# Install Nessus
Write-Host "Installing Nessus..."
Start-Process -FilePath "msiexec.exe" -ArgumentList "/i $installerPath /quiet /norestart" -Wait

# Start Nessus Service
Write-Host "Starting Nessus Service..."
Start-Service -Name "Tenable Nessus"

# Check if Nessus is Running
Write-Host "Checking Nessus Status..."
Get-Service -Name "Tenable Nessus"

# Show Access URL
$ip = (Get-NetIPAddress | Where-Object { $_.AddressFamily -eq "IPv4" -and $_.InterfaceAlias -notlike "*Loopback*" }).IPAddress
Write-Host "Nessus is installed. Access it at: https://$ip:8834"

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✅ Features of These Scripts

✔ Automatically detects OS (Linux version).
✔ Downloads the correct Nessus package based on OS.
✔ Starts & enables Nessus service after installation.
✔ Shows Nessus Web UI URL after installation.