RHEL and Ubuntu Server dominate enterprise Linux. RHEL leads in regulated industries. Ubuntu leads in cloud and AI/ML. Both are production-grade — the difference is ecosystem and support model.
Overview
| Aspect | RHEL 9 | Ubuntu 24.04 LTS |
|---|---|---|
| Vendor | Red Hat (IBM) | Canonical |
| Release cycle | Major every 3-4 years | LTS every 2 years |
| Support | 10 years + ELS | 12 years (ESM) |
| Package manager | dnf (RPM) | apt (DEB) |
| Init system | systemd | systemd |
| Default filesystem | XFS | ext4 |
| SELinux | Enforcing (default) | AppArmor (default) |
| Kernel | 5.14+ (stable, backported) | 6.8+ (newer) |
| Free tier | 16 systems (developer subscription) | Free (full) |
| Cost | $349-$1,299/yr per system | $0 (paid support: Ubuntu Pro) |
Package management
RHEL (dnf)
# Install
sudo dnf install nginx
# Search
dnf search postgresql
# Module streams (multiple versions)
sudo dnf module enable postgresql:16
sudo dnf install postgresql-server
# Security updates only
sudo dnf update --security
# Application streams
sudo dnf install @nodejs:20Ubuntu (apt)
# Install
sudo apt install nginx
# Search
apt search postgresql
# PPA for newer versions
sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt install python3.12
# Security updates only
sudo apt upgrade -o Dpkg::Options::="--force-confdef"
# Snap packages
sudo snap install node --channel=20/stable --classicRHEL’s module streams provide multiple software versions without third-party repos. Ubuntu relies on PPAs or Snaps for newer versions.
Security
| Feature | RHEL | Ubuntu |
|---|---|---|
| MAC | SELinux (enforcing) | AppArmor (enforcing) |
| FIPS 140-2/3 | Certified | Certified (Pro) |
| CIS Benchmarks | Available | Available |
| CVE response | Red Hat Security (fast) | Canonical Security (fast) |
| Live patching | kpatch (included) | Livepatch (Pro) |
| SCAP | OpenSCAP (built-in) | OpenSCAP (manual) |
| Container security | Podman (rootless, default) | Docker (default), Podman available |
SELinux vs AppArmor: SELinux is more granular but harder to manage. AppArmor is simpler but less comprehensive. For compliance-heavy environments (finance, government, healthcare), SELinux’s policy granularity is often required.
AI and ML workloads
| Feature | RHEL | Ubuntu |
|---|---|---|
| NVIDIA driver | Available (RPM Fusion / NVIDIA repo) | Available (apt, default repos) |
| CUDA | Supported | Supported (most tutorials target Ubuntu) |
| ROCm (AMD) | Supported | Primary target |
| RHEL AI | InstructLab + Granite (built-in) | N/A |
| ML frameworks | Container-based (Podman) | pip/conda (native) |
| Cloud ML images | Available (AWS, Azure, GCP) | Default on most cloud ML instances |
Ubuntu dominates AI/ML because NVIDIA and AMD target Ubuntu first. Most ML tutorials, Docker images, and cloud instances default to Ubuntu. RHEL AI offers a unique integrated path with InstructLab for enterprise model fine-tuning.
Cloud adoption
| Provider | RHEL | Ubuntu |
|---|---|---|
| AWS | RHEL AMI (paid) | Ubuntu AMI (free) |
| Azure | RHEL (paid, Red Hat partnership) | Ubuntu (free, Canonical partnership) |
| GCP | RHEL (paid) | Ubuntu (free) |
| Default choice | Second | First (most cloud tutorials) |
Decision guide
Choose RHEL when:
- Regulated industries (finance, government, healthcare) — FIPS, CIS, STIG compliance
- Red Hat ecosystem — Ansible AAP, Satellite, OpenShift
- SELinux is required by security policy
- Long-term stability with predictable kernel backports
- Enterprise support with guaranteed SLAs from Red Hat
Choose Ubuntu when:
- AI/ML workloads — best NVIDIA/AMD driver support, most ML frameworks target Ubuntu
- Cloud-native — default on most cloud providers, smaller image sizes
- Cost — free with optional Ubuntu Pro for enterprise features
- Developer familiarity — most tutorials and documentation target Ubuntu
- Newer kernel and packages — access to latest features sooner
