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https://github.com/syncthing/syncthing

Open Source Continuous File Synchronization
https://github.com/syncthing/syncthing

go p2p peer-to-peer synchronization

Last synced: 5 days ago
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Open Source Continuous File Synchronization

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README 

        
# Docker Container for Syncthing



Use the Dockerfile in this repo, or pull the `syncthing/syncthing` image

from Docker Hub.



Use the `/var/syncthing` volume to have the synchronized files available on the

host. You can add more folders and map them as you prefer.



Note that Syncthing runs as UID 1000 and GID 1000 by default. These may be

altered with the `PUID` and `PGID` environment variables. In addition

the name of the Syncthing instance can be optionally defined by using

`--hostname=syncthing` parameter.



To grant Syncthing additional capabilities without running as root, use the

`PCAP` environment variable with the same syntax as that for `setcap(8)`.

For example, `PCAP=cap_chown,cap_fowner+ep`.



To set a different umask value, use the `UMASK` environment variable. For

example `UMASK=002`.



## Example Usage



**Docker cli**

```

$ docker pull syncthing/syncthing

$ docker run -p 8384:8384 -p 22000:22000/tcp -p 22000:22000/udp -p 21027:21027/udp \

    -v /wherever/st-sync:/var/syncthing \

    --hostname=my-syncthing \

    syncthing/syncthing:latest

```



**Docker compose**

```yml

---

version: "3"

services:

  syncthing:

    image: syncthing/syncthing

    container_name: syncthing

    hostname: my-syncthing

    environment:

      - PUID=1000

      - PGID=1000

    volumes:

      - /wherever/st-sync:/var/syncthing

    ports:

      - 8384:8384 # Web UI

      - 22000:22000/tcp # TCP file transfers

      - 22000:22000/udp # QUIC file transfers

      - 21027:21027/udp # Receive local discovery broadcasts

    restart: unless-stopped

    healthcheck:

      test: curl -fkLsS -m 2 127.0.0.1:8384/rest/noauth/health | grep -o --color=never OK || exit 1

      interval: 1m

      timeout: 10s

      retries: 3

```



## Discovery



Note that Docker's default network mode prevents local IP addresses from

being discovered, as Syncthing is only able to see the internal IP of the

container on the `172.17.0.0/16` subnet. This will result in poor transfer rates

if local device addresses are not manually configured.



It is therefore advisable to use the [host network mode](https://docs.docker.com/network/host/) instead:



**Docker cli**

```

$ docker pull syncthing/syncthing

$ docker run --network=host \

    -v /wherever/st-sync:/var/syncthing \

    syncthing/syncthing:latest

```



**Docker compose**

```yml

---

version: "3"

services:

  syncthing:

    image: syncthing/syncthing

    container_name: syncthing

    hostname: my-syncthing

    environment:

      - PUID=1000

      - PGID=1000

    volumes:

      - /wherever/st-sync:/var/syncthing

    network_mode: host

    restart: unless-stopped

    healthcheck:

      test: curl -fkLsS -m 2 127.0.0.1:8384/rest/noauth/health | grep -o --color=never OK || exit 1

      interval: 1m

      timeout: 10s

      retries: 3

```



Be aware that syncthing alone is now in control of what interfaces and ports it

listens on. You can edit the syncthing configuration to change the defaults if

there are conflicts.



## GUI Security



By default Syncthing inside the Docker image listens on 0.0.0.0:8384 to

allow GUI connections via the Docker proxy. This is set by the

`STGUIADDRESS` environment variable in the Dockerfile, as it differs from

what Syncthing would otherwise use by default. This means you should set up

authentication in the GUI, like for any other externally reachable Syncthing

instance. If you do not require the GUI, or you use host networking, you can

unset the `STGUIADDRESS` variable to have Syncthing fall back to listening

on 127.0.0.1:



```

$ docker pull syncthing/syncthing

$ docker run -e STGUIADDRESS= \

    -v /wherever/st-sync:/var/syncthing \

    syncthing/syncthing:latest

```



With the environment variable unset Syncthing will follow what is set in the

configuration file / GUI settings dialog.