Alpine-Syncthing

Container for Alpine Linux + Syncthing

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This image containerizes the statically built Syncthing daemon, used to setup a continuous decentralized file sync acrosss multiple devices.

Auto updated according to the Github stable releases.

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

The image is tagged respectively for the following architectures,

• armhf
• armv7l
• aarch64
• x86_64 (retagged as the latest )

non-x86_64 builds have embedded binfmt_misc support and contain the qemu-user-static binary that allows for running it also inside an x86_64 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-syncthing:x86_64

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Run

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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..

This image already has a user syncthing configured to drop privileges to the passed PUID/PGID which is ideal if its used to run in non-root mode. That way you only need to specify the values at runtime and pass the -u syncthing if need be. (run id in your terminal to see your own PUID/PGID values.)

Before you run..

• Config is loaded from /home/syncthing/config/config.xml, edit this file or mount your own. Can also be configured via the web GUI. Same goes for certificates.

• default data dir for syncthing is /home/syncthing/data.

• Does not create the default directory by default. Pass a falsy value to the env var STNODEFAULTFOLDER to disable it.

• Syncthing runs under the user syncthing.

Running make starts the service.

# make
docker run --rm -it \
  --name docker_syncthing --hostname syncthing \
  -e PGID=1000 -e PUID=1000 \
  -p 8384:8384 -p 22000:22000 -p 21027:21027/udp \
  -v /etc/hosts:/etc/hosts:ro \
  -v /etc/localtime:/etc/localtime:ro \
  -v data:/home/syncthing/data \
  -v config:/home/syncthing/config \
  woahbase/alpine-syncthing:x86_64

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

# make stop
docker stop -t 2 docker_syncthing

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

# make rm
docker rm -f docker_syncthing

Restart the container with

# make restart
docker restart docker_syncthing

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Shell access

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Get a shell inside a already running container,

# make debug
docker exec -it docker_syncthing /bin/bash

set user or login as root,

# make rdebug
docker exec -u root -it docker_syncthing /bin/bash

To check logs of a running container in real time

# make logs
docker logs -f docker_syncthing

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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-syncthing
cd alpine-syncthing

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 DOCKERSRC=woahbase/alpine-glibc:x86_64 \
  --build-arg PGID=1000 \
  --build-arg PUID=1000 \
  -t woahbase/alpine-syncthing:x86_64 \
  .

To check if its working..

# make ARCH=x86_64 test
docker run --rm -it \
  --name docker_syncthing --hostname syncthing \
  -e PGID=1000 -e PUID=1000 \
  woahbase/alpine-syncthing:x86_64 \
  sh -ec 'sleep 15; syncthing --version'

And finally, if you have push access,

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