Debian 12 Bookworm

Debian 12 “Bookworm” on Azure

A production-ready Debian 12 (“Bookworm”) Gen2 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 — maintained by an independent project with a multi-decade reputation for stability. This image gives you that stable 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, teams standardizing on the stable distribution Ubuntu derives from, and anyone migrating off a Linux distribution that has reached end of life.

Target industries & use cases: Financial services, healthcare, government, telecom, retail, and regulated environments that require reproducible, audited Linux base images. Common workloads: web hosting (Apache, nginx, Caddy with PHP-FPM, Node.js, Python), containerized applications (Docker, Podman, Kubernetes nodes with containerd), database servers (PostgreSQL, MariaDB, MongoDB, Redis), and CI/CD runner hosts.

Value proposition: Provisioning a secure Debian 12 host on Azure normally 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

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 (root SSH disabled, password auth disabled, audit logging configured, serial-console exposure closed) that production needs. This image is aligned with our Debian 11, Debian 13, and Ubuntu fleet images for one operational playbook across every host.

Recommended deployment: Standard_D2as_v5 or larger for general-purpose web and container 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. Debian is free and open-source software; standard Azure compute and storage rates apply.

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

Documentation: www.dcassociatesgroup.com/docs/debian-12-bookworm-on-azure — deployment guide, hardening reference, monthly changelog.