CalendarServer

Revision 43 as of 2008-01-15 07:30:27

Clear message

Warning /!\ THIS PAGE DOES NOT WORK AT THIS TIME. IT WILL BE FIXED SHORTLY

  • If you have any problems with the instructions provided here, please provide comment and feedback.

This page explains how to install Apple's [http://en.wikipedia.org/wiki/Darwin_Calendar_Server Darwin Calendar Server] (also called DCS, and the basis for their iCal Server) on Ubuntu Server 7.10, though other variants of both 7.10 and Hardy Heron should also work.

What is CalDAV?

There are many ways of enabling other people to see your calendar, but the two most common, are what Evolution calls "On the web"-calendars (or [http://en.wikipedia.org/wiki/Webcal webcal]), and CalDAV-calendars. "On the web" calendars are simply iCalendar files stored on a web-server for clients to download. Nothing magical about it. Your calendar application will open a normal http connection to the web server, download the calendar file and use it just like a normal, local calendar, except in most cases it will be read-only. The application can also publish the calendar to the web-server using WebDAV.

WebDAV, an abbreviation that stands for Web-based Distributed Authoring and Versioning, refers to the set of extensions to the Hypertext Transfer Protocol (HTTP) which allows users to collaboratively edit and manage files on remote World Wide Web servers. The "On the web"-type of calendar is suitable when you want anyone in the world to have access to the calendar. A TV-channel could use this to announce their program, for instance, or Free Software communities can use it to enable users to see how the project is progressing, release dates, etc. If this is all you want, then you don't really need a CalDAV server. Apache will do the trick, with with mod_dav if you want WebDAV publishing support. ([http://www.digital-arcanist.com/sanctum/article.php?story=20070427101250622 WebDAV with Apache 2.x on Ubuntu])

Built on top of WebDAV, CalDAV is a standard protocol, specified in [http://tools.ietf.org/html/rfc4791 RFC 4791], which enables advanced online calendar functions. Concepts such as users, groups, locations and resources are introduced, enabling collaborative scheduling. Different users of different groups can have different permissions to read and write to a calendar, etc. Also, a CalDAV calendar doesn't use a single file, but stores calendar events as files in directories. It also handles recurring events, enables free/busy lookups, etc. This makes CalDAV suitable for an office environment.

Install procedure for Ubuntu Server 7.10

To instal Apple's iCal Server, you need to download some packages using apt-get, and some software using subversion. Most users will be familiar with apt-get, many with subversion. If you're not familiar with subversion, don't panic. This guide will be a detailed, step by step howto, showing exactly which commands to enter and when.

To make this work you will need to enable the Universe repositories (see ["AddingRepositoriesHowto"] and remember to do an  apt-get update  afterwards).

Ready?

  • Log into the server console or via ssh, so you can enter commands.
  • Install pre packaged software:

 sudo apt-get install subversion libkrb5-dev attr curl build-essential libssl-dev python-pysqlite2 bzip2 curl zope3 python-xml python-pyopenssl python-dateutil python-xattr python-pysqlite2 python-twisted python-vobject python-kerberos  (it's 42MB to download)

  • We now need to edit our /etc/fstab file and add  user_xattr  to the options for the partition containing the CalDAV server, / in this case:  sudo editor /etc/fstab  This is what the /etc/fstab change looks like: {{{ Before: UUID=94a96528-c889-45a1-bc98-d9d02ecdd59c / ext3 defaults,errors=remount-ro 0 1

After : UUID=94a96528-c889-45a1-bc98-d9d02ecdd59c / ext3 defaults,errors=remount-ro,user_xattr 0 1 }}}

Warning /!\ You must modify the settings for the partition on which you're installing the server. So if your /opt is on a different partition, you must set the  user_xattr  flag and modify the instructions to match.

  • Remount the file system (to activate user_xattr):  sudo mount -o remount / 

  • Make sure we're in our home directory,  cd ~ 

  • Download the server software itself using subversion (its ~20mb):

     svn checkout http://svn.macosforge.org/repository/calendarserver/CalendarServer/trunk CalendarServer 

  • Let's make a directory in /opt for CalendarServer to live in:  sudo mkdir /opt/caldavd 

  • Subversion has downloaded the software and created a directory for us, called CalendarServer. Let's move that directory into the one we created. Its install script will make a few more subdirectories, which should also live in that folder;  sudo mv CalendarServer /opt/caldavd 

  • Change into the new directory;  cd /opt/caldavd/CalendarServer 

  • Provided is a script to download some necessary packages, configure, etc:  sudo ./run -s 

  • Our CalDAV server is almost ready for action. Let's copy the test configuration so we can get it up and running as quickly as possible:  sudo cp conf/caldavd-test.plist conf/caldavd-dev.plist 

  • Now we can do need to do a little configuration:  sudo vim conf/caldavd-dev.plist 

  • First change the hostname for the server. Locate the line  <!-- Network host name -->  and change  <string>localhost</string>  to  <string>your-real-hostname</string>  (That is, put the actual name of your server inside the string, it's used within URLs within the software.)

  • To make the server available to connections from other computers. Locate this line:  <!-- List of IP addresses to bind to [empty = all] -->  and replace  127.0.0.1  in  <string>127.0.0.1</string>  with either nothing or a specific, public ip address for your server.

Warning /!\ [https://bugs.launchpad.net/ubuntu/+source/evolution/+bug/160190 Bug #160190]: As of 2007-11-05 there is a bug in Evolution that prevents us from using this set-up to authenticate to the caldavd server. The report has contributions which explain how to enable Evolution to connect. It's not included here, because it's important that you check out the bug yourself.

  • Create a new user and group named caldavd;  sudo adduser --system caldavd --group --no-create-home 

  • Change ownership;  sudo chown -R caldavd:caldavd /opt/caldavd 

  • Run the server as the new user in the background:  sudo -u caldavd -b /opt/caldavd/CalendarServer/run 

That's it! The server is up and running, and you can connect to it with your CalDAV client using  caldav://ADDRESS:8008/calendars/users/admin/calendar  to test the server using username  admin  and password  admin 

To Do

We also need to set up users and permissions for the server itself, so people can connect to the server and share their calendars, which is what we've been aiming for.

We should also document where the server-data is stored, so the information that users have entrusted to the server can be backed up.

Ideally we should package this application so the installation is installable with a single command.

References:

CatagoryDocumentation CatagoryCleanup