What Is AlmaLinux

AlmaLinux is an open-source, community-driven, enterprise-grade Linux distribution designed for Red Hat Enterprise Linux (RHEL) users, providing a 1:1 binary-compatible alternative.

Project Origins

The AlmaLinux project was launched by CloudLinux in 2021 as a response to the change in direction of the CentOS project. When Red Hat announced that CentOS Linux 8 would reach end of support at the end of 2021 and that the focus would shift to CentOS Stream, AlmaLinux emerged to fill the gap.

Key Milestones

January 2021   CloudLinux announces the launch of the AlmaLinux project
March 2021     AlmaLinux 8.3, the first official release, is published
May 2021       The AlmaLinux OS Foundation is established
May 2022       AlmaLinux 9.0 is released
May 2025       AlmaLinux 10.0 "Purple Lion" is officially released (GA)
May 2026       AlmaLinux 10.2 and 9.8 are released (current latest stable versions)

Core Features

🔒 Enterprise-Grade Stability

• Long-term support: each major version provides a 10-year lifecycle
• Security updates: timely tracking of RHEL security patches
• Production-ready: rigorously tested, suitable for mission-critical environments

🆓 Completely Free

• No license fees: free to use forever
• No subscription restrictions: no registration or subscription required
• Business-friendly: supports deployment in commercial environments

🔄 RHEL Compatible

• Binary compatible: 1:1 compatibility with RHEL
• ABI/API stable: ensures seamless application migration
• Package management compatible: supports RPM and DNF package managers

🌐 Community Governance

• Independent foundation: managed by the AlmaLinux OS Foundation
• Transparent decisions: community participation in major decisions
• Diverse support: contributors and sponsors from around the world

Technical Architecture

System Components

Component	Description	Version
Kernel	Linux Kernel	5.14+
Init system	systemd	239+
Package manager	DNF/YUM	4.x
Container runtime	Podman	4.x
Security framework	SELinux	Mandatory access control

Supported Architectures

• x86_64: primary supported architecture
• aarch64: ARM64 architecture support
• ppc64le: Power PC 64-bit little-endian
• s390x: IBM Z series mainframes

Comparison with Other Distributions

AlmaLinux vs CentOS Stream

• Stability: AlmaLinux focuses more on stability, while CentOS Stream leans toward the cutting edge
• Release cadence: AlmaLinux follows RHEL, while CentOS Stream serves as the RHEL upstream
• Enterprise applications: AlmaLinux is better suited for production environments

AlmaLinux vs Rocky Linux

• Governance model: AlmaLinux is managed by a foundation, while Rocky Linux is community-managed
• Release cadence: both closely follow RHEL releases
• Technical differences: largely identical in terms of binary compatibility

AlmaLinux vs Ubuntu

• Release cycle: AlmaLinux offers 10-year LTS, Ubuntu offers 5-year LTS
• Package management: RPM vs DEB ecosystems
• Enterprise support: both have mature enterprise-grade support

Use Cases

🏢 Enterprise Servers

# Typical enterprise use cases
# Web server
sudo dnf install httpd mariadb-server php
sudo systemctl enable --now httpd mariadb

# Database server
sudo dnf install postgresql-server
sudo postgresql-setup --initdb
sudo systemctl enable --now postgresql

# Application server
sudo dnf install java-11-openjdk tomcat
sudo systemctl enable --now tomcat

☁️ Cloud Computing Environments

• Containerized deployment: native support for Docker and Podman
• Kubernetes: complete container orchestration support
• Cloud-native: compatible with mainstream cloud service providers

🔬 Development Environments

• Development toolchain: complete support for GCC, Python, and Node.js
• Version control: version control systems such as Git and SVN
• IDE support: VS Code, IntelliJ IDEA, and more

Community Ecosystem

Official Resources

• Official website: almalinux.org
• Documentation center: complete deployment and management documentation
• Forum support: an active user community

Chinese Community

• Localization support: Chinese documentation and tutorials
• Technical exchange: QQ groups and WeChat groups
• Mirror services: mirror sites such as Alibaba Cloud and Tsinghua University

Enterprise Support

• CloudLinux: the original sponsor, providing commercial support
• Other vendors: support from cloud providers such as IBM and Amazon

Security Features

Built-in Security

# SELinux security framework
sudo getenforce
sudo setsebool -P httpd_can_network_connect 1

# Firewall configuration
sudo firewall-cmd --permanent --add-service=http
sudo firewall-cmd --reload

# System hardening
sudo dnf install aide
sudo aide --init

Compliance Certifications

• Common Criteria: conforms to international security standards
• FIPS 140-2: Federal Information Processing Standards
• Domestic adaptation: supports domestic software and hardware ecosystems

Performance Optimization

System Tuning

# Kernel parameter tuning
echo 'vm.swappiness=10' >> /etc/sysctl.conf
echo 'net.core.rmem_max=16777216' >> /etc/sysctl.conf

# Service optimization
sudo systemctl disable bluetooth
sudo systemctl mask bluetooth

# Storage optimization
sudo fstrim -av

Monitoring Tools

• System monitoring: Cockpit web console
• Performance analysis: perf, top, htop
• Log analysis: journalctl, rsyslog

Getting Started

Quick Installation

1. Download the ISO image
2. Create a bootable drive
3. Boot the installer
4. Complete basic configuration

Configuration Recommendations

# Update the system
sudo dnf update -y

# Install basic tools
sudo dnf groupinstall "Development Tools"
sudo dnf install vim git wget curl

# Configure the timezone
sudo timedatectl set-timezone Asia/Shanghai

AlmaLinux provides enterprises and individual users with a stable, secure, and free RHEL-compatible alternative, making it an ideal choice for modern IT infrastructure.