Alpine Linux Based DNSSEC Validating Recursive Unbound DNS Resolver Docker Image

Build status

This is a lightweight Alpine Linux based Docker image that runs Unbound, an open source high-performance DNS resolver developed by the nice people at NLnet Labs running as your own recursive DNS server in a secure single-layer distroless scratch image modeled by following the best practice principles.

While it leaves almost nothing to be desired, it is perfectly suited for professional and personal use alike.

Features

Feature	Supported
Unprivileged user	yes
Unprivileged port (privileged possible)	yes
Custom UID/GID environment variables	yes
CD built single-layer distroless scratch image running Alpine Linux	yes
Per hardware architecture optimized & CD built OpenSSL	yes
Libevent	yes
Recursive DNS as default	yes
DNSSEC	yes
DNSCrypt	yes
DNSTap	yes
DNS64	yes
DNS over HTTPS	yes
DNS over TLS	yes
Redis via UNIX Socket or network	yes
Optional privacy respecting & meaningful healthcheck	yes
Optional Unbound statistics for Grafana via Zabbix utilizing on-board means	yes
Python	no
EDNS Client Subnet	no

Getting started

Docker containers are most easily used with docker compose.

Important

We encourage you to read the Details page to learn how to get this up and running, some example Docker-Compose files can be found here.

If you prefer to use Podman and systemd to manage your containers, example Quadlets can be found here.

Available Docker Tags

You can pull the most recent image from Docker Hub using it's latest tag or by using the corresponding image version number:

docker pull madnuttah/unbound:latest or docker pull madnuttah/unbound:1.1.0-0

The image versioning scheme follows unbound - complemented by a dash and the desired image revision, for example 1.1.0-0.

There are canary builds of the image available. You can pull the image using it's canary tag:

docker pull madnuttah/unbound:canary

Note

Canary builds may contain bugs and are not recommended to be used in production environments. These builds are untested and also unsupported by us.

Changes

You can view the changes in the Releases section.

Feedback

We are here to help! Don't hesitate to contact us through a GitHub Issue if you have any questions, requests or problems with the image.

You can also reach us on Fosstodon:

Acknowledgements

• Alpine Linux
• Docker
• Unbound
• OpenSSL
• Redis
• Pi-hole
• Aqua Security
• The many Docker Images which got us inspired

Licenses

License

Unless otherwise specified, all code is released under the MIT license. See the LICENSE for details.

Licenses for other components

• Docker: Apache 2.0
• Unbound: BSD License
• OpenSSL: Apache-style license

Legal

Please note that this is a work of a private contributor and we're neither affiliated with NLnet Labs or Pi-hole nor is NLnet Labs or Pi-hole involved in the development of the image. The marks and properties 'Unbound' and 'Pi-hole' are properties of NLnet Labs and Pi-hole respectively. All rights in the source codes, including logos relating to said marks and properties belong to their respective owners.

Supporting our mission

In case you would like to donate money, please rather spend it on the upstream projects this image relies on.

If you like what we do and if you find this image protecting your privacy and giving back your DNS liberty useful - consider becoming a stargazer ⭐ on Docker Hub and GitHub. Thank you for your support! ❤️