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title
syncthing

linuxserver/syncthing

Syncthing replaces proprietary sync and cloud services with something open, trustworthy and decentralized. Your data is your data alone and you deserve to choose where it is stored, if it is shared with some third party and how it's transmitted over the Internet.

Supported Architectures

Our images support multiple architectures such as x86-64, arm64 and armhf. We utilise the docker manifest for multi-platform awareness. More information is available from docker here and our announcement here.

Simply pulling ghcr.io/linuxserver/syncthing should retrieve the correct image for your arch, but you can also pull specific arch images via tags.

The architectures supported by this image are:

Architecture	Tag
x86-64	amd64-latest
arm64	arm64v8-latest
armhf	arm32v7-latest

Application Setup

**Note: ** The Syncthing devs highly suggest setting a password for this container as it listens on 0.0.0.0. To do this go to Actions -> Settings -> set user/password for the webUI.

Usage

To help you get started creating a container from this image you can either use docker-compose or the docker cli.

docker-compose (recommended, click here for more info)

---
version: "2.1"
services:
  syncthing:
    image: ghcr.io/linuxserver/syncthing
    container_name: syncthing
    hostname: syncthing #optional
    environment:
      - PUID=1000
      - PGID=1000
      - TZ=Europe/London
    volumes:
      - /path/to/appdata/config:/config
      - /path/to/data1:/data1
      - /path/to/data2:/data2
    ports:
      - 8384:8384
      - 22000:22000/tcp
      - 22000:22000/udp
      - 21027:21027/udp
    restart: unless-stopped

docker cli (click here for more info)

docker run -d \
  --name=syncthing \
  --hostname=syncthing `#optional` \
  -e PUID=1000 \
  -e PGID=1000 \
  -e TZ=Europe/London \
  -p 8384:8384 \
  -p 22000:22000/tcp \
  -p 22000:22000/udp \
  -p 21027:21027/udp \
  -v /path/to/appdata/config:/config \
  -v /path/to/data1:/data1 \
  -v /path/to/data2:/data2 \
  --restart unless-stopped \
  ghcr.io/linuxserver/syncthing

Parameters

Docker images are configured using parameters passed at runtime (such as those above). These parameters are separated by a colon and indicate <external>:<internal> respectively. For example, -p 8080:80 would expose port 80 from inside the container to be accessible from the host's IP on port 8080 outside the container.

Ports (`-p`)

Parameter	Function
`8384`	Application WebUI
`22000/tcp`	Listening port (TCP)
`22000/udp`	Listening port (UDP)
`21027/udp`	Protocol discovery

Environment Variables (`-e`)

Env	Function
`PUID=1000`	for UserID - see below for explanation
`PGID=1000`	for GroupID - see below for explanation
`TZ=Europe/London`	Specify a timezone to use EG Europe/London.

Volume Mappings (`-v`)

Volume	Function
`/config`	Configuration files.
`/data1`	Data1
`/data2`	Data2

Miscellaneous Options

Parameter	Function
`--hostname=`	Optionally the hostname can be defined.

Environment variables from files (Docker secrets)

You can set any environment variable from a file by using a special prepend FILE__.

As an example:

-e FILE__PASSWORD=/run/secrets/mysecretpassword

Will set the environment variable PASSWORD based on the contents of the /run/secrets/mysecretpassword file.

Umask for running applications

For all of our images we provide the ability to override the default umask settings for services started within the containers using the optional -e UMASK=022 setting. Keep in mind umask is not chmod it subtracts from permissions based on it's value it does not add. Please read up here before asking for support.

User / Group Identifiers

When using volumes (-v flags), permissions issues can arise between the host OS and the container, we avoid this issue by allowing you to specify the user PUID and group PGID.

Ensure any volume directories on the host are owned by the same user you specify and any permissions issues will vanish like magic.

In this instance PUID=1000 and PGID=1000, to find yours use id user as below:

  $ id username
    uid=1000(dockeruser) gid=1000(dockergroup) groups=1000(dockergroup)

Docker Mods

We publish various Docker Mods to enable additional functionality within the containers. The list of Mods available for this image (if any) as well as universal mods that can be applied to any one of our images can be accessed via the dynamic badges above.

Support Info

Shell access whilst the container is running:
- docker exec -it syncthing /bin/bash
To monitor the logs of the container in realtime:
- docker logs -f syncthing
Container version number
- docker inspect -f '{{ index .Config.Labels "build_version" }}' syncthing
Image version number
- docker inspect -f '{{ index .Config.Labels "build_version" }}' ghcr.io/linuxserver/syncthing

Versions

12.05.21: - Remove sysctl parameter again
03.05.21: - Raise maximum UDP buffer size.
03.05.21: - Add port mapping for 22000/udp.
29.01.21: - Deprecate UMASK_SET in favor of UMASK in baseimage, see above for more information.
23.01.21: - Rebasing to alpine 3.13.
15.09.20: - Use go from alpine edge repo to compile. Remove duplicate UMASK env var. Add hostname setting.
01.06.20: - Rebasing to alpine 3.12.
19.12.19: - Rebasing to alpine 3.11.
28.06.19: - Rebasing to alpine 3.10.
23.03.19: - Switching to new Base images, shift to arm32v7 tag.
05.03.19: - Update Build process for v1.1.0 release.
22.02.19: - Rebasing to alpine 3.9.
16.01.19: - Add pipeline logic and multi arch.
30.07.18: - Rebase to alpine 3.8 and use buildstage.
13.12.17: - Rebase to alpine 3.7.
25.10.17: - Add env for manual setting of umask.
29.07.17: - Simplify build structure as symlinks failing on > 0.14.32
28.05.17: - Rebase to alpine 3.6.
08.02.17: - Rebase to alpine 3.5.
01.11.16: - Switch to compiling latest version from git source.
14.10.16: - Add version layer information.
30.09.16: - Fix umask.
09.09.16: - Add layer badges to README.
28.08.16: - Add badges to README.
11.08.16: - Rebase to alpine linux.
18.12.15: - Initial testing / release (IronicBadger)
24.09.15: - Inital dev complete (Lonix)

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