Debian 11

Debian 11 LTS on Azure

A production-ready Debian 11 (“Bullseye”) LTS Linux image, built and hardened for the Azure Marketplace. Debian is the upstream that Ubuntu is built on — the same package format, the same systemd, the same long-term-support discipline — but maintained by an independent volunteer project with a multi-decade reputation for stability. This image gives you that base, pre-integrated with Azure and certified to Microsoft Marketplace standards.

Who this is for: Platform engineers, ISVs, and operators who run Debian on-prem and want one consistent OS across cloud and edge, or teams migrating from a Linux distribution that has reached end of life.

Target industries: Financial services, healthcare, government, ISVs hosting customer workloads, telecom, retail, and regulated environments that require reproducible, audited Linux base images.

Value proposition: Provisioning a secure Debian 11 host on Azure means installing the Azure Linux Agent, configuring Trusted Launch, applying current kernel CVEs, and validating against Microsoft Marketplace certification. This image does all of that for you:

• Monthly patch cadence — each version is rebuilt from upstream Debian security updates within days of release
• 33 documented hardening traps applied — every published version is gated through an automated trap-audit covering Trusted Launch, sysprep race conditions, Defender pre-installation, hardening-script residue, and 29 more
• Trusted Launch + Secure Boot enabled by default — Gen2 image with vTPM and signed-boot configured per Microsoft’s OEM requirements
• Azure Linux Agent pre-installed and pre-configured — walinuxagent.service is running; custom-script and run-command work on first boot
• Audit trail per release — build provenance and certification evidence retained for every published version

Named use cases: Web hosting (Apache, nginx, Caddy with PHP-FPM, Node.js, Python); containerized applications (Docker, Podman, Kubernetes-node with containerd); database servers (PostgreSQL, MariaDB, MongoDB, Redis); CI/CD runner host; dev and staging environments.

How this differs from rolling your own: The public Debian cloud image is fine for a single dev VM but lacks the Azure-specific hardening (immutable serial console disabled, root SSH disabled, audit logging configured) that production deployments need. Aligned with our Ubuntu 24.04 and SQL Server images for one operational playbook across the fleet.

Plans available:

• Debian 11 LTS — Gen2 — Trusted Launch-capable Gen2 VM image; free image (standard Azure compute and storage rates apply). Debian is free and open-source software.

Recommended deployment: Standard_D2as_v5 or larger for general-purpose workloads; Standard_E2as_v5 or larger for memory-heavy databases. Premium SSD or Premium SSD v2 for data disks. Front public web workloads with Azure Application Gateway with TLS termination. SSH key authentication required (password auth disabled).

Azure integration: Azure Linux Agent, Trusted Launch + Secure Boot, Azure Monitor Agent, Azure Backup, Azure Disk Encryption, Azure Defender for Servers, and Azure VM Run Command all attach via standard extensions with no compatibility shims.

Support: support@dcassociatesgroup.com · www.dcassociatesgroup.com/support — 24-hour initial response SLA.

Documentation: www.dcassociatesgroup.com/docs/debian-11-on-azure — deployment guide, hardening reference, monthly changelog.