Radicale

Radicale is a server designed to support the CalDav and CardDav protocols. It operates either as a standalone package using its own internal http server or can be integrated with an existing webserver.

Installation

Warning: For existing installations - Radicale has had two major release changes. You need to export old version 1.x calendars before you install version 2.x. Please read. And for upgrades to version 3.x please also read

Install the radicale package.

Configuration

The easiest thing is to follow the instructions at the Radicale website.

The main configuration file is located at /etc/radicale/config.

Many of the configuration options can be changed on the command-line:

$ radicale --help

If you run a mail server the radicale-imap-git^AUR or radicale-dovecot-auth^AUR IMAP authentication plugins may be useful. If you use radicale-dovecot-auth with UNIX sockets, create a radicale.service drop-in file with the following contents:

[Service]
RestrictAddressFamilies=
RestrictAddressFamilies=~AF_PACKET AF_NETLINK

This allows the process to open AF_UNIX sockets.

Integration

Radicale can be integrated with HTTP webservers like Apache HTTP Server via Reverse Proxy or the WSGI interface.

Client support

Since it uses the CalDav and CardDav protocols, it should support most clients. Currently, the officially supported list is this.

The following list may or may not be accurate:

Thunderbird Lightning extension and Cardbook
GNOME/Evolution, Contacts and Calendar
KOrganizer korganizer
InfCloud infcloud^AUR, CalDavZAP, CardDavMATE
syncEvolution syncevolution^AUR
aCal, ContactSync, CalendarSync, CalDAV-Sync CardDAV-Sync and DAVx⁵ for Android
Mac OSX Calendar/Contacts
Apple iOS
- Note that iOS requires a SSL in order to sync CalDAV/CarDAV (as of iOS14 self-signed SSL is sufficient for Radicale to integrate as an account) [1], this can be created by following the instructions in OpenSSL#Generate a self-signed certificate with private key in a single command.
  - Note also that key sizes must be greater than 2048 bits [2]

Troubleshooting

DecSync plugin fails

If you use the python-radicale-decsync^AUR plugin and it errors with

Failed to load storage module 'radicale_storage_decsync': libcrypt.so.1

install the libxcrypt-compat package.