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HAProxy Enterprise Level Implementation - Coggle Diagram
HAProxy Enterprise Level Implementation
HAProxy Fundamentals
Introduction to HAProxy
What is HAProxy
High Availability Proxy
Open Source Load Balancer
Reverse Proxy
TCP Proxy
HTTP Proxy
HAProxy Architecture
Client
|
HAProxy Load Balancer
|
Backend Servers
Why Use HAProxy
High Availability
Load Distribution
Application Scalability
Fault Tolerance
Performance Optimization
Security Control
Common use cases
Load balancing – Spread requests across multiple backend servers.
High availability – Detect unhealthy servers and stop sending traffic to them.
SSL/TLS termination – Handle HTTPS encryption so backend servers don't have to.
Reverse proxy – Hide backend servers from the public internet.
Health checks – Continuously monitor backend server health.
Session persistence (sticky sessions) – Keep a user connected to the same backend server when needed.
Rate limiting and access control – Protect applications from abuse.
TCP and HTTP proxying – Works for web traffic and other protocols like databases or mail servers.
HAProxy Core Concepts
Frontend
Accept Client Connections
Bind IP Address and Port
SSL Termination
Request Processing
Backend
Application Servers
Server Pools
Health Checks
Load Balancing Algorithm
Server
Individual Backend Node
IP Address
Port
Weight
Health Status
ACL Access Control List
Traffic Matching Rules
URL Based Routing
Host Based Routing
Header Based Routing
HAProxy Enterprise Architecture
Enterprise Network Design
Internet Users
DNS
Domain Resolution
Firewall
Security Filtering
NAT
Port Forwarding
HAProxy Layer
Reverse Proxy
Load Balancer
SSL Offloading
Traffic Management
Application Layer
Web Servers
Apache
Nginx
Application Servers
Java
Node.js
Python
.NET
Database Layer
MySQL
PostgreSQL
Oracle
Three Tier Architecture
Presentation Layer
HAProxy
Application Layer
Application Servers
Data Layer
Database Servers
HAProxy Installation
Supported Platforms
Ubuntu Server
Debian
RHEL
CentOS Stream
Rocky Linux
AlmaLinux
Installation Methods
Package Installation
apt
yum
dnf
Source Compilation
Latest Version
Custom Features
Container Deployment
Docker
Kubernetes
Verify Installation
haproxy -v
systemctl status haproxy
HAProxy Configuration Management
Main Configuration File
/etc/haproxy/haproxy.cfg
Configuration Structure
Global Section
Process Settings
Logging
Security Parameters
Performance Tuning
Defaults Section
Timeout Settings
Logging Mode
Error Handling
Frontend Section
Client Traffic Handling
Binding Ports
SSL Configuration
Backend Section
Server Pool Definition
Load Balancing Method
Health Checks
Listen Section
Combined Frontend Backend
HAProxy Configuration Structure
Global Section
Purpose
Defines HAProxy-wide settings that affect the entire HAProxy process.
Controls process behavior, security, logging, performance, and system integration.
Process Settings
daemon
Runs HAProxy as a background service (daemon) instead of staying attached
to the terminal.
user
Defines the Linux user account under which HAProxy runs after startup.
Improves security by avoiding root execution.
group
Defines the Linux group used by the HAProxy process.
Controls file and resource permissions.
pidfile
Stores the process ID (PID) of the running HAProxy service.
Used for service management and monitoring.
nbthread
Defines the number of CPU threads HAProxy uses.
Improves performance on multi-core systems.
maxconn
Sets the maximum number of simultaneous client connections.
Prevents resource exhaustion.
Logging
log
Defines where HAProxy sends logs.
Usually sends logs to Linux rsyslog or a centralized logging server.
Syslog Integration
Sends HAProxy events to syslog services such as rsyslog or journald.
Access Logs
Records client requests, source IPs, URLs, response codes, and traffic details.
Error Logs
Records failures, connection problems, backend errors, and security events.
Security Parameters
chroot
Places HAProxy inside a restricted filesystem directory.
Limits damage if HAProxy is compromised.
user/group separation
Runs HAProxy with minimum required privileges.
Follows the principle of least privilege.
SSL Certificate Management
Defines locations of SSL certificates used for HTTPS termination.
Security Hardening
Includes disabling insecure protocols, limiting access,
and protecting administrative interfaces.
Performance Tuning
maxconn
Controls maximum concurrent connections HAProxy accepts.
nbthread
Enables parallel processing using multiple CPU cores.
tune.bufsize
Controls memory buffer size for HTTP requests and responses.
Compression
Reduces bandwidth usage by compressing HTTP responses.
Defaults Section
Purpose
Provides default settings inherited automatically by frontend,
backend, and listen sections.
Reduces configuration duplication.
Timeout Settings
timeout connect
Maximum time HAProxy waits to establish a connection
with a backend server.
timeout client
Maximum inactivity time allowed for client connections.
timeout server
Maximum inactivity time allowed for backend server responses.
timeout check
Time allowed for backend health-check responses.
Logging Mode
option httplog
Enables detailed HTTP request logging.
option tcplog
Enables TCP connection logging.
Error Handling
Error Pages
Defines custom pages displayed when HAProxy encounters errors.
Retries
Defines how many times HAProxy retries failed backend connections.
Redispatch
Sends requests to another server if the selected backend fails.
Frontend Section
Purpose
Defines how HAProxy receives traffic from clients.
It represents the client-facing side of HAProxy.
Client Traffic Handling
Client Connections
Accepts incoming HTTP or TCP requests from users.
ACL Rules
Defines traffic filtering rules based on IP, URL,
headers, cookies, or request methods.
Routing Rules
Decides which backend receives specific requests.
Binding Ports
bind *:80
Makes HAProxy listen for HTTP traffic on port 80.
bind *:443
Makes HAProxy listen for HTTPS encrypted traffic.
IP Binding
Allows HAProxy to listen on specific network interfaces.
SSL Configuration
SSL Termination
HAProxy decrypts HTTPS traffic before forwarding it internally.
Certificate
Defines SSL/TLS certificate files used for HTTPS.
TLS Security
Controls supported TLS versions and encryption settings.
Backend Section
Purpose
Defines the group of application servers that receive traffic
from HAProxy.
Server Pool Definition
server keyword
Defines individual backend servers.
Server IP Address
Specifies the IP address and port of application servers.
Weight
Assigns more or less traffic to specific servers.
Load Balancing Method
Round Robin
Sends requests sequentially to each server.
Least Connections
Sends new connections to the server with fewer active sessions.
Source Hash
Keeps the same client connected to the same server.
Weighted Balance
Distributes traffic according to server capacity.
Health Checks
check
Enables automatic monitoring of backend servers.
HTTP Health Check
Sends HTTP requests to verify application availability.
TCP Health Check
Checks if the TCP service port is reachable.
Server Status
Marks servers UP or DOWN based on health results.
Listen Section
Purpose
Combines frontend and backend functionality into one section.
Useful for simple services.
Combined Frontend Backend
Client Binding
Defines the port where HAProxy accepts connections.
Backend Servers
Defines destination servers receiving traffic.
Load Balancing
Defines traffic distribution method.
Health Monitoring
Checks availability of service endpoints.
Common Usage
Used for database proxies, statistics pages,
small applications, and TCP services.
HAProxy Load Balancing Algorithms
Round Robin
Equal Traffic Distribution
Least Connection
Send Traffic to Server With Fewest Connections
Source Hash
Client IP Based Persistence
URI Hash
URL Based Distribution
Random
Random Server Selection
Static Round Robin
Fixed Server Assignment
Backend Server Management
Server Configuration
Server Name
IP Address
Port
Weight
Backup Server
Maintenance Mode
Example Concepts
Application Server 1
Application Server 2
Application Server 3
Server States
UP
DOWN
MAINT
DRAIN
Health Check Implementation
Purpose
Detect Failed Servers
Automatic Traffic Removal
High Availability
Health Check Methods
TCP Check
Port Availability
HTTP Check
Application Response
Custom Health Check
URL Monitoring
API Monitoring
Advanced Checks
Expected HTTP Status
Response Content Validation
Agent Checks
SSL TLS Implementation
SSL Termination
Client HTTPS
HAProxy Decryption
Backend HTTP Traffic
SSL Passthrough
Client HTTPS
HAProxy Forward Encrypted Traffic
Backend HTTPS
Certificate Management
PEM Files
Private Key Protection
Certificate Renewal
TLS Security
TLS 1.2
TLS 1.3
Cipher Configuration
HSTS
Reverse Proxy Implementation
Traffic Flow
Client
HTTPS Request
HAProxy
Receive Request
Inspect Traffic
Apply Rules
Backend
Forward Request
Reverse Proxy Features
Header Manipulation
URL Routing
Host Routing
Security Filtering
Logging
Advanced Routing
Host Based Routing
example.com
api.example.com
Path Based Routing
/app
/api
/admin
Header Based Routing
User Agent
HTTP Headers
Cookie Based Routing
Session Persistence
Session Persistence
Why Persistence
Maintain User Sessions
Methods
Cookie Persistence
Source IP Persistence
URL Parameter Persistence
Enterprise Examples
Banking Applications
E-Commerce
ERP Systems
HAProxy Security Hardening
Operating System Security
Minimal Linux Installation
Patch Management
SELinux
Firewall Rules
HAProxy Security
Disable Weak TLS
Secure Statistics Page
Hide Server Information
Limit Administrative Access
Run With Non Root User
Protection Against Attacks
DDoS Protection
Connection Limits
Rate Limiting
Request Filtering
HAProxy Firewall Integration
Network Security Architecture
Internet
Firewall
HAProxy
Application Servers
Firewall Rules
Allow HTTP 80
Allow HTTPS 443
Restrict Management Access
Security Zones
DMZ Zone
Application Zone
Database Zone
HAProxy High Availability Cluster
Why HA Cluster
No Single Point Of Failure
Components
HAProxy Node 1
HAProxy Node 2
Virtual IP Address
Technologies
Keepalived
VRRP Protocol
Floating IP
Pacemaker
Corosync
HAProxy Monitoring
Statistics Dashboard
HAProxy Stats Page
Metrics
Connections
Requests
Response Time
Errors
Server Health
Monitoring Tools
Prometheus
Grafana
Zabbix
Nagios
Elastic Stack
Logging and SIEM Integration
HAProxy Logs
Access Logs
Error Logs
Security Events
Log Forwarding
Rsyslog
Filebeat
Logstash
SIEM Integration
ELK Stack
Splunk
QRadar
Sentinel
Security Detection
DDoS Detection
Failed Requests
Attack Patterns
Performance Optimization
System Tuning
CPU Optimization
Memory Optimization
Network Tuning
File Descriptor Limits
HAProxy Tuning
Max Connections
Connection Queues
Buffer Size
Timeout Optimization
Kernel Optimization
TCP Parameters
Network Buffers
Enterprise Deployment Scenarios
Web Applications
Apache Cluster
Nginx Cluster
Microservices
API Gateway
Service Routing
Cloud Environment
AWS
Azure
Google Cloud
Container Environment
Docker
Kubernetes
HAProxy Ingress Controller
HAProxy Troubleshooting
Common Issues
Configuration Errors
Backend Server Down
SSL Certificate Errors
Connection Timeout
High Latency
Troubleshooting Commands
systemctl status haproxy
journalctl -u haproxy
haproxy -c -f configuration_file
tcpdump
netstat
ss command
HAProxy Enterprise Operations
Change Management
Configuration Backup
Version Control
Testing Before Deployment
Documentation
Network Diagram
Traffic Flow
Server Inventory
Recovery Procedures
Disaster Recovery
Backup Configuration
Secondary HAProxy Node
Failover Testing
HAProxy Certification and Job Skills
Linux Administration
RHEL
Ubuntu
Networking
Firewall
Systemd
Networking Skills
TCP/IP
DNS
HTTP HTTPS
SSL TLS
Security Skills
OWASP Top 10
WAF Integration
Vulnerability Management
Cloud Skills
AWS Load Balancer Concepts
Kubernetes Networking
Monitoring Skills
ELK
Prometheus
Grafana
Enterprise HAProxy Lab Project
Lab Architecture
Client Machine
Firewall
HAProxy Server
Web Server 1
Web Server 2
Database Server
Implementation Tasks
Install HAProxy
Configure Reverse Proxy
Configure Load Balancing
Configure Health Checks
Configure SSL
Configure Keepalived
Integrate Monitoring
Send Logs To SIEM
Perform Security Testing
Security Testing
Nmap Testing
SSL Testing
Load Testing
Vulnerability Assessment
Log Analysis