Since this guide, there is official docker image which might be much better starting point. This guide should be re-evaluated.
Updates are appreciated
Go to the DSM Package Center and install the Docker package. Run it.
Use the DSM Control Panel to create a new user called docker. Make a note of the user's UID:
$ id -u docker
1234
The rest of this page will assume a UID of 1234.
Create a new directory on your NAS (doesn't really matter where) and copy these two files there. You'll use them to create your image.
Dockerfile
FROM python:alpine
ARG DOCKER_UID
# Create a user to run the application
RUN adduser -D -u ${DOCKER_UID} flexget
WORKDIR /home/flexget
# Data and config volumes
VOLUME /home/flexget/.flexget
VOLUME /home/flexget/torrents
# Install build dependencies and FlexGet
RUN apk add --no-cache --virtual .build-deps gcc g++ musl-dev linux-headers && \
pip3 install -U pip && pip3 install flexget && \
apk del .build-deps gcc musl-dev
# Add start script
COPY start.sh /home/flexget/
RUN chmod +x ./start.sh
USER flexget
CMD ["./start.sh"]
start.sh
#!/bin/sh
if [ -f ~/.flexget/.config-lock ]; then
rm ~/.flexget/.config-lock
fi
flexget daemon start
Make a note of the current version of FlexGet on PyPI (we'll use this to label the image we create). At time of writing, this is 3.1.62.
Navigate into the directory containing the files above. To build your image, run the following command (don't forget to substitute in your docker user's UID):
docker build --build-arg DOCKER_UID=1234 -t flexget:3.1.62 .
Make sure that it worked by running docker images. You should see something like this:
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
flexget 3.1.62 ff4e5f3f1239 20 hours ago 160.4 MB
python alpine 2070486450e1 2 weeks ago 88.63 MB
FlexGet and Transmission make a great pair; FlexGet decides what .torrents to grab (say, from an RSS feed) and Transmission handles downloading the actual content. Docker makes it really easy to run Transmission as well.
As above, copy the file below into its own directory (not the one you used for FlexGet). Note, the download folder in the container starts with a capital D!
Dockerfile
FROM alpine
ARG DOCKER_UID
# Create a user to run the application
RUN adduser -D -u ${DOCKER_UID} transmission
WORKDIR /home/transmission
# Data and config volumes
VOLUME /home/transmission/.config
VOLUME /home/transmission/Downloads
VOLUME /home/transmission/incomplete
VOLUME /home/transmission/watch
# Install Transmission
RUN apk update && apk add --no-cache transmission-daemon
EXPOSE 9091
USER transmission
ENTRYPOINT ["transmission-daemon", "--foreground", "--log-info"]
Navigate into said directory and run this command to build an image:
docker build --build-arg DOCKER_UID=1234 -t transmission:2.94-r1 .
And again, check that it worked:
$ docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
transmission 2.94-r1 15577a02872f 20 hours ago 8.157 MB
flexget 3.1.62 ff4e5f3f1239 20 hours ago 160.4 MB
python 3.6-alpine 2070486450e1 2 weeks ago 88.63 MB
alpine latest 76da55c8019d 2 weeks ago 3.962 MB
The provided Dockerfiles use the VOLUME directive to create points at which we can mount the host's filesystem into that of our containers. This is very handy:
The docker run commands you need to launch each container are below. Note that once you've launched a container, docker stop and docker start are used to control its state.
Create the necessary directories on your NAS:
mkdir -p \
/volume1/docker/transmission/config \
/volume1/docker/transmission/incomplete \
/volume1/docker/transmission/watch
The docker run command below maps Transmission's config, incomplete, and watch directories into locations under /volume1/docker/transmission on the host. It also maps the downloads directory to a Shared Folder cat /volume1/Media/Downloads.
Note that you'll need to set the correct in-container locations for each of these directories in Transmission's settings.json file at /volume1/docker/transmission/config/transmission-daemon/settings.json. This file gets created automatically the first time the container starts, so you can just start it once to generate a default config.
Use this command to launch the container:
docker run -d \
--env "TZ=America/Los_Angeles" \
--name transmission \
--net host \
--publish 9091:9091 \
--restart always \
--volume /volume1/docker/transmission/config:/home/transmission/.config \
--volume /volume1/docker/transmission/incomplete:/home/transmission/incomplete \
--volume /volume1/docker/transmission/watch:/home/transmission/watch \
--volume /volume1/Media/Downloads:/home/transmission/Downloads \
transmission:latest
Stop it with docker stop transmission before editing the settings file.
Choose a password you'll use to access the Transmission web UI and then change the following settings:
{
"blocklist-enabled": true,
"blocklist-url": "http://john.bitsurge.net/public/biglist.p2p.gz",
"download-dir": "/home/transmission/Downloads",
"incomplete-dir": "/home/transmission/incomplete",
"incomplete-dir-enabled": true,
"rpc-authentication-required": true,
"rpc-bind-address": "0.0.0.0",
"rpc-enabled": true,
"rpc-password": "password",
"rpc-port": 9091,
"rpc-url": "/transmission/",
"rpc-username": "you",
"rpc-whitelist": "127.0.0.1",
"rpc-whitelist-enabled": false,
"start-added-torrents": true,
"trash-original-torrent-files": true,
"watch-dir": "/home/transmission/watch",
"watch-dir-enabled": true
}
Save your changes and start Transmission back up with docker start transmission.
The web UI will be available at http://your-nas-host:9091/transmission/web/ (don't omit the trailing slash).
Create the necessary directories:
mkdir -p /volume1/docker/flexget
Start FlexGet:
docker run -d \
--env "TZ=America/Los_Angeles" \
--name flexget \
--restart always \
--volume /volume1/docker/flexget:/home/flexget/.flexget \
--volume /volume1/docker/transmission/watch:/home/flexget/torrents \
flexget:3.1.62
With these volume settings, FlexGet will download .torrent files directly into Transmission's watch directory.
Your config file lives at /volume1/docker/flexget/config.yml. It's not necessary to stop/start the whole container when you make changes – instead, use the following command:
docker exec flexget flexget daemon reload-config
I hope this guide was helpful!