Alpine-PDNSd

Container for Alpine Linux + Proxy DNS Daemon (caching recursive DNS Server)

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This image containerizes the PDNSd DNS server with persistent caching-to-disk and recursion/forwarding, mainly used to resolve domain names (both local devices and outsiders) and blocking ads inside the local network.

Based on Alpine Linux from my alpine-s6 image with the s6 init system overlayed in it.

The image is tagged respectively for the following architectures,

• armhf
• x86_64 (retagged as the latest )

armhf builds have embedded binfmt_misc support and contain the qemu-user-static binary that allows for running it also inside an x64 environment that has it.

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Get the Image

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Pull the image for your architecture it's already available from Docker Hub.

# make pull
docker pull woahbase/alpine-pdnsd:x86_64

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Run

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Before you run..

• Default configuration is at /etc/pdnsd.conf, the default is provided in root/defaults, put your custom config file at /data/pdnsd.conf at it will be copied over at start.

• Local names are served from /data/hosts/hosts.local, if not found, /etc/hosts is copied.

• A default blocklist from the following sources are provided as default at /etc/hosts.blocked. On start, this is copied over to /data/hosts/hosts.blocked, if not existing already. Replace this file to use your own blocking list. Current build combines the following lists ..

  • AdAway's Sources
  • Someonewhocares
  • StevenBlack's List
  • hpHosts

• To unblock a specific domain from the blocklist, put it inside /data/hosts/hosts.whitelisted ( Needs restart ). To manually unblock using sed..

sed -i \
  -e 's/\([ . ]\)rt.com/\1notrt.com/g' \
  /data/hosts/*

• On many systemd derivations e.g. ArchLinux, 53/udp may be already taken by systemd-resolved. In that case, it will need to be stopped first before dns server is started. Run,

sudo systemctl stop systed-resolved

If you want to run images for other architectures, you will need to have binfmt support configured for your machine. multiarch, has made it easy for us containing that into a docker container.

# make regbinfmt
docker run --rm --privileged multiarch/qemu-user-static:register --reset

Without the above, you can still run the image that is made for your architecture, e.g for an x86_64 machine..

Running make starts the service.

# make
docker run --rm -it \
  --name docker_pdnsd --hostname pdnsd \
  -e PGID=1000 -e PUID=1000 \
  -c 256 -m 400m -p 53:53/tcp -p 53:53/udp \
  -v data:/data \
  -v /etc/hosts:/etc/hosts:ro \
  -v /etc/localtime:/etc/localtime:ro \
  woahbase/alpine-pdnsd:x86_64

Stop the container with a timeout, (defaults to 2 seconds)

# make stop
docker stop -t 2 docker_pdnsd

Removes the container, (always better to stop it first and -f only when needed most)

# make rm
docker rm -f docker_pdnsd

Restart the container with

# make restart
docker restart docker_pdnsd

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Shell access

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Get a shell inside a already running container,

# make shell
docker exec -it docker_pdnsd /bin/bash

set user or login as root,

# make rshell
docker exec -u root -it docker_pdnsd /bin/bash

To check logs of a running container in real time

# make logs
docker logs -f docker_pdnsd

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Development

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If you have the repository access, you can clone and build the image yourself for your own system, and can push after.

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Setup

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Before you clone the repo, you must have Git, GNU make, and Docker setup on the machine.

git clone https://github.com/woahbase/alpine-pdnsd
cd alpine-pdnsd

You can always skip installing make but you will have to type the whole docker commands then instead of using the sweet make targets.

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Build

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You need to have binfmt_misc configured in your system to be able to build images for other architectures.

Otherwise to locally build the image for your system. [ARCH defaults to x86_64, need to be explicit when building for other architectures.]

# make ARCH=x86_64 build
# sets up binfmt if not x86_64
docker build --rm --compress --force-rm \
  --no-cache=true --pull \
  -f ./Dockerfile_x86_64 \
  --build-arg ARCH=x86_64 \
  --build-arg DOCKERSRC=alpine-s6 \
  --build-arg PGID=1000 \
  --build-arg PUID=1000 \
  --build-arg USERNAME=woahbase \
  -t woahbase/alpine-pdnsd:x86_64 \
  .

To check if its working..

# make ARCH=x86_64 test
docker run --rm -it \
  --name docker_pdnsd --hostname pdnsd \
  -e PGID=1000 -e PUID=1000 \
  --entrypoint pdnsd
  woahbase/alpine-pdnsd:x86_64 \
  '--version'

And finally, if you have push access,

# make ARCH=x86_64 push
docker push woahbase/alpine-pdnsd:x86_64

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Maintenance

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Sources at Github. Built at Travis-CI.org (armhf / x64 builds). Images at Docker hub. Metadata at Microbadger.

Maintained by WOAHBase.