btafoya / docker-radicale

Docker image for Radicale calendar and contact server, +security +addons

Docker-Radicale

Enhanced Docker image for Radicale, the CalDAV/CardDAV server.

Features

• 🔐 Secured: run as a normal user, not root
• ✨ Enhanced: add Git for versioning, Bcrypt for authentication
• 🏗️ Multi-architecture: run on amd64, arm (RaspberryPI...) and others

Changelog

📃 See CHANGELOG.md

Version, Tags and Multi-architecture

Latest tag:

Starting from 2.1.11.3, this image has a manifest which allow you to just pull the image without supplying the architecture. The command docker pull tomsquest/docker-radicale should pull the correct image.

Else, the image is also tagged with this scheme:

Version number = Architecture + '.' + Radicale version + '.' + increment number

Example: those tags were created for Radicale 2.1.11:

• tomsquest/docker-radicale:386.2.1.11.0
• tomsquest/docker-radicale:amd64.2.1.11.0
• tomsquest/docker-radicale:arm.2.1.11.0
• tomsquest/docker-radicale:arm64.2.1.11.0

The last number is ours, incremented on changes. For example, 2.1.11.2 made the /config readonly (this is specific to this image).

Additionally, Docker Hub automatically build and publish this image as tomsquest/docker-radicale.

Running

Minimal instruction:

docker run -d --name radicale \
    -p 5232:5232 \
    tomsquest/docker-radicale

Production-grade instruction:

docker run -d --name radicale \
    -p 127.0.0.1:5232:5232 \
    --read-only \
    --init \    --security-opt="no-new-privileges:true" \
    --cap-drop ALL \
    --cap-add CHOWN \
    --cap-add SETUID \
    --cap-add SETGID \
    --cap-add KILL \
    --pids-limit 50 \
    --memory 256M \
    --health-cmd="curl --fail http://localhost:5232 || exit 1" \
    --health-interval=30s \
    --health-retries=3 \
    -v ~/radicale/data:/data \
    -v ~/radicale/config:/config:ro \
    tomsquest/docker-radicale

Note: On the Linux Kernel capabilities, CHOWN, SETUID and SETGID are for fixing the permission of the mounted volume. KILL is to allow Radicale to exit.

Running with Docker compose

A Docker compose file is included. It can be extended.

Extending the image

The image is extendable, as per Docker image architecture. You need to create your own Dockerfile.

For example, here is how to add radicale-imap (authenticate by email) and RadicaleInfCloud (an alternative UI) to the image.

First, create a Dockerfile.extended (pick the name you want) with this content:

FROM tomsquest/docker-radicale

RUN python3 -m pip install radicale-imap
RUN python3 -m pip install git+https://github.com/Unrud/RadicaleInfCloud

Then, build and run it:

docker build -t radicale-extended -f Dockerfile.extended .
docker run --name radicale-extended -p 5232:5232 radicale-extended

Custom User/Group ID for the data volume

You will certainly mount a volume to keep Radicale data between restart/upgrade of the container. But sharing files from the host and the container can be problematic. The reason is that radicale user in the container does not match the user running the container on the host.

To solve this, this image offers four options (see below for details):

• Option 0. Do nothing, permission will be fixed by the container itself
• Option 1. Create a user/group with id 2999 on the host
• Option 2. Specify a custom user/group id on docker run
• Option 3. Build the image with a custom user/group

Option 0. Do nothing, the container will fix the permission itself

When running the container with a /data volume (eg. -v /mydata/radicale:/data), the container entrypoint will automatically fix the permissions on /data.

This option is OK but not optimal:

• Ok for the container, as inside it the radicale user can read and write its data
• But on the host, the data directory will then be owned by the user/group 2999:2999

Option 1. User/Group 2999 on the host

The image creates a user and a group with Id 2999.
You can create an user/group on your host matching this Id.

Example:

sudo addgroup --gid 2999 radicale
sudo adduser --gid 2999 --uid 2999 --shell /bin/false --disabled-password --no-create-home radicale

Option 2. Custom User/Group at run time

The user and group Ids used in the image can be overridden when the container is run.
This is done with the UID and GID env variables, eg. docker run -e UID=123 -e GID=456 ....

⚠️ The --read-only run flag cannot be used in this case. Using custom UID/GID tries to modify the filesystem at runtime but this is made impossible by the --read-only flag.

Option 3. Custom User/Group at build time

You can build the image with custom user and group Ids and still use the --read-only flag.
But, you will have to clone this repo, do a local build and keep up with changes of this image.

Usage: docker build --build-arg=BUILD_UID=5000 --build-arg=BUILD_GID=5001 ....

BUILD_UID and BUILD_GID are also supported as environment variables to work around a problem on some Synology NAS. See this PR#68.

Custom configuration

To customize Radicale configuration, either:

• Recommended: use this repository preconfigured config file,
• Use the original config file and:
  1. set hosts = 0.0.0.0:5232
  2. set filesystem_folder = /data/collections

Then mount your custom config volume when running the container: -v /my_custom_config_directory:/config.

Contributing

To run the tests (your user will need to be a member of the docker group)

1. pip install pipenv
2. pipenv install -d
3. pytest -v

Releasing

1. Create a Git tag, eg. 2.1.11.0, push it and Travis will build the images and publish them on Docker hub
2. Update the latest tag

Example instructions :

# Next release
git tag 2.1.11.6
git push origin 2.1.11.6

# latest tag
git push --delete origin latest
git tag -d latest
git tag latest
git push origin latest

Contributors

• adzero: override build args with environment variables
• Robert Beal: fixed/configurable userId, versioning...
• Loader23: config volume idea
• Waja: less layers is more, InfCloud integration (UI for Radicale)
• Christian Burmeister: add tzdata to be able to specify timezone
• Thomas Queste: initial image