In 2026, Oracle Cloud Infrastructure (OCI) offers one of the most diverse selections of operating systems in the cloud market, ranging from automated "self-patching" Linux to the latest enterprise Windows editions.

Here are your primary OS options for your rented servers:

1. The Oracle "First-Class" Options

These OS images are maintained by Oracle and are highly optimized for OCI hardware (like the SmartNIC/Off-box virtualization).

• Oracle Linux (Versions 7, 8, 9, and 10): The native OS for OCI. It includes the Unbreakable Enterprise Kernel (UEK) for better performance and security. Premier Support is included for free with your OCI subscription.

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• Oracle Autonomous Linux: A "hands-off" version of Oracle Linux that automatically applies security patches and kernel updates without rebooting (Zero-Downtime Patching).

• Oracle Linux Cloud Developer: A pre-loaded image containing popular development tools (Java, Python, Node.js, Go, Terraform, OCI CLI) so you can start coding in seconds.

2. Microsoft Windows Server

Oracle is a primary partner for Microsoft workloads. You can launch Windows instances with licenses included or "Bring Your Own License" (BYOL).

• Available Versions: Windows Server 2016, 2019, 2022, and 2025.

• Editions: Generally available in Standard and Datacenter editions.

• Optimization: Includes the OCI specialized drivers (VirtIO) for maximum disk and network throughput.

3. Popular Open-Source & Enterprise Linux

If your team has a preferred distribution, OCI supports the major players natively:

• Ubuntu: Includes Ubuntu 20.04, 22.04, and 24.04 LTS. Oracle provides a "Minimal" version for those who want a tiny footprint.

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• Red Hat Enterprise Linux (RHEL): Fully supported through a strategic partnership. You can use RHEL 7, 8, 9, or 10 images with standard support.

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• CentOS Stream: While classic CentOS reached its end-of-life, OCI provides CentOS Stream 8 and 9.

• SUSE Linux Enterprise Server (SLES): Available for enterprise workloads requiring SUSE-specific support.

4. Community & Marketplace Options

Through the OCI Marketplace, you can find dozens of community-maintained or specialized images:

• AlmaLinux & Rocky Linux: The popular community-driven alternatives to CentOS.

• FreeBSD: Supported as a platform image for users who prefer the BSD ecosystem.

• Custom Images (Bring Your Own OS): If your OS isn't on the list, OCI allows you to upload your own VMDK or QCOW2 files. As long as it supports 64-bit x86 or ARM and has the necessary drivers, you can run it.

OS Availability by Architecture (2026)

A Note on Arm (Ampere A1)

If you are renting Oracle's Ampere A1 (Arm) shapes, ensure you select an image labeled "aarch64." Most Linux distributions (Oracle, Ubuntu, RHEL) have full Arm support on OCI, but Windows is currently restricted to x86 shapes.