unofficial unbound multiarch docker image

Unbound is a validating, recursive, and caching DNS resolver.

Usage

NLnet Labs documentation: https://unbound.docs.nlnetlabs.nl/en/latest/

# print general usage
docker run --rm klutchell/unbound:1.14.0 -h

# run a recursive dns server on host port 53
docker run --name unbound \
  -p 53:53/tcp \
  -p 53:53/udp \
  klutchell/unbound:1.14.0

# mount existing configuration from a host directory
docker run --name unbound \
  -p 53:53/tcp \
  -p 53:53/udp \
  -v unbound:/etc/unbound \
  klutchell/unbound:1.14.0

# add a regular healthcheck to test dns resolution
docker run --name unbound \
  -p 53:5053/tcp \
  -p 53:5053/udp \
  -v /path/to/config:/etc/unbound \
  --health-cmd "dig sigok.verteiltesysteme.net @127.0.0.1" \
  klutchell/unbound:1.14.0

The provided unbound.conf will provide recursive DNS with DNSSEC validation. However Unbound has many features available so I recommend getting familiar with the documentation and mounting your own config directory.

https://unbound.docs.nlnetlabs.nl/en/latest/manpages/unbound.conf.html

Examples

Use unbound as upstream DNS for Pi-Hole.

version: "2"

volumes:
  pihole:
  dnsmasq:

services:
  pihole:
    image: pihole/pihole
    cap_add:
      - NET_ADMIN
    volumes:
      - "pihole:/etc/pihole"
      - "dnsmasq:/etc/dnsmasq.d"
    dns:
      - "127.0.0.1"
      - "1.1.1.1"
    network_mode: host
    environment:
      - "DNS1=127.0.0.1#5053"
      - "DNS2=127.0.0.1#5053"
  unbound:
    image: klutchell/unbound:1.14.0
    ports:
      - "5053:53/tcp"
      - "5053:53/udp"

Build

# optionally update root hints before building
rm rootfs_overlay/etc/unbound/root.hints
wget https://www.internic.net/domain/named.root -O rootfs_overlay/etc/unbound/root.hints

# enable docker buildkit and experimental mode
export DOCKER_BUILDKIT=1
export DOCKER_CLI_EXPERIMENTAL=enabled

# build local image for native platform
docker build . --pull --tag klutchell/unbound --load

# cross-build for another platform
docker build . --pull --tag klutchell/unbound --load --platform linux/arm/v6

Test

# enable QEMU for arm emulation
docker run --rm --privileged multiarch/qemu-user-static:5.2.0-2 --reset -p yes

# run a detached unbound container
docker run --rm -d --name unbound klutchell/unbound:1.14.0

# run dig with dnssec to test an example NOERROR endpoint
docker exec unbound dig sigok.verteiltesysteme.net @127.0.0.1 +dnssec

# run dig with dnssec to test an example SERVFAIL endpoint
docker exec unbound dig sigfail.verteiltesysteme.net @127.0.0.1 +dnssec

# stop and remove the container
docker stop unbound

Contributing

Please open an issue or submit a pull request with any features, fixes, or changes.

https://github.com/klutchell/unbound-docker/issues

Acknowledgments

Original software is by NLnet Labs: https://unbound.net