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Unlimited Digital Development Environment for High Availability Clusters

flowchart TD
    subgraph "HA Cluster Setup (ha_cluster_setup.sh)"
        InstallTools["Install Critical HA Tools\n(corosync, pacemaker, pcs)"]
        InstallSupport["Install Supporting Tools\n(ufw, haproxy, fail2ban, nginx, apache2)"]
        StaticIP["Static IP Configuration\n(netplan guidance)"]
        SSLCert["SSL Certificate Setup\n(Self-signed for Nginx/Apache2)"]
        DefaultServices["Default Service Setup\n(Start & enable HAProxy, Fail2Ban, nginx, apache2)"]
        ServiceStatus["Service Status Check\n(Display status of critical services)"]
        ManualConfig["Manual Advanced Config\n(Corosync/PCS setup left for user)"]
    end

    InstallTools --> InstallSupport
    InstallSupport --> StaticIP
    StaticIP --> SSLCert
    SSLCert --> DefaultServices
    DefaultServices --> ServiceStatus
    ServiceStatus --> ManualConfig

    subgraph "Basic Security"
        UFW["UFW Firewall"]
        Haproxy["HAProxy\n(Load Balancer)"]
        Fail2ban["Fail2Ban\n(Intrusion Prevention)"]
        Haveged["Haveged\n(Randomness Generator)"]
    end

    DefaultServices --> UFW
    DefaultServices --> Haproxy
    DefaultServices --> Fail2ban
    DefaultServices --> Haveged

    subgraph "Web & SSH Setup"
        NginxSetup["Nginx Setup & Config Guide"]
        HTTPSSetup["Enable HTTPS\n(Self-signed Cert.)"]
        SSHConn["Establish SSH Connections"]
    end

    DefaultServices --> NginxSetup
    DefaultServices --> HTTPSSetup
    DefaultServices --> SSHConn

    ManualConfig -.-> |User customizes| InstallTools
    ManualConfig -.-> |User customizes| InstallSupport
    ManualConfig -.-> |User customizes| StaticIP
    ManualConfig -.-> |User customizes| SSLCert
    ManualConfig -.-> |User customizes| DefaultServices

    %% Legend
    classDef core fill:#f5f5dc,stroke:#333,stroke-width:2px;
    class InstallTools,InstallSupport,StaticIP,SSLCert,DefaultServices,ServiceStatus,ManualConfig core;
    classDef security fill:#e0f7fa,stroke:#333,stroke-width:2px;
    class UFW,Haproxy,Fail2ban,Haveged security;
    classDef webssh fill:#e6ee9c,stroke:#333,stroke-width:2px;
    class NginxSetup,HTTPSSetup,SSHConn webssh;

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High Availability Clusters

• HArmadillium
• HA Cluster Setup

The ha_cluster_setup.sh script is a beginner-friendly starting point for setting up a High Availability (HA) cluster. It simplifies and accelerates the installation process by automating the basic steps while skipping detailed configurations for advanced tools like corosync and pcs. This allows users to quickly install required components and focus on further customization later.

Key Features for Beginners:

1. Basic Installation:

   • Installs critical HA tools like corosync, pacemaker, pcs, and supporting tools such as ufw, haproxy, fail2ban, nginx, and apache2.
   • Automates dependency installation, reducing manual setup time.

2. Static IP Configuration:

   • Guides users through setting up a static IP with a generated netplan configuration.
   • Ensures the system is network-ready before starting advanced HA configurations.

3. SSL Certificate Setup:

   • Includes a simple method for generating self-signed SSL certificates for Nginx and Apache2.
   • Ensures HTTPS readiness without requiring external certificate management.

4. Default Service Setup:

   • Starts and enables basic services like HAProxy, Fail2Ban, nginx, and apache2 with minimal configurations.
   • Provides example configurations for Nginx and Apache2 to get services running quickly.

5. Service Status Check:

   • Displays the status of critical services at the end, helping users verify that the basic setup is complete.

Key Note:

• Corosync and PCS: While these tools are installed, no advanced cluster configuration is included. Users will need to configure corosync and pcs manually based on their specific HA cluster requirements.
• Purpose: The script is focused on speeding up the initial setup rather than providing a fully configured HA environment.

This script is an excellent tool for beginners who want to quickly set up the foundational components of an HA cluster and explore further configurations at their own pace.

Introduction-to-High-Availability

• Nginx Setup — Nginx Configuration Guide
• Enable HTTPS with Self-Signed Certificate
• Establish SSH Connections

Basic Security (If needed,use this: SELKS)

• UFW -- UFW Firewall setup
• Haproxy -- Haproxy github repository: -- Haproxy and Load Balancing Concepts
• Fail2ban -- Protect WebServer with Fail2ban
• Haveged (Haveged inspired algorithm has been included in the Linux kernel )

apt install ufw haproxy fail2ban
systemctl enable ufw haproxy fail2ban

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HappyCoding!