Requirements:

* Server running Ubuntu Precise or Debian Wheezy
* At least 2 CPUs for production use
* At least 4GB of RAM for production use
* At least 100GB of free disk for production use
* HTTP(S) access to the public Internet (for some features;
  discuss with Zulip Support if this is an issue for you)
* SSL Certificate for the host you're putting this on
  (e.g. https://zulip.example.com)
* Zulip deployment key for the host that you're putting this on.
  You should have been provided with one by Zulip support.
* Email credentials for the service to send outgoing emails to users
  (e.g. missed message notifications, password reminders if you're not
  using SSO, etc.).

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How to install Zulip Enterprise:

These instructions should be followed as root.

(1) Install the SSL certificates for your machine to
  /etc/ssl/private/zulip-enterprise.key
  and
  /etc/ssl/certs/zulip-enterprise.combined-chain.crt

(2) download zulip-server.tar.gz, and unpack to it /root/zulip, e.g.
tar -xf zulip-server-1.1.3.tar.gz
mv zulip-server-1.1.3 /root/zulip

(3) run /root/zulip/scripts/setup/install

This may take a while to run, since it will install a large number of
packages via apt.

(4) Configure the Zulip server instance by filling in the settings in
/etc/zulip/settings.py

(5) su zulip -c /home/zulip/deployments/current/scripts/setup/initialize-database

This will report an error if you did not fill in all the mandatory
settings from /etc/zulip/settings.py.  Once this completes
successfully, the main installation process will be complete, and if
you are planning on using password authentication, you should be able
to visit the URL for your server and register for an account.

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SSO Authentication:

We integrate with your Single-Sign-On solution.  There are a few ways
to do it, but this section documents how to configure Zulip to use
your SSO solution that supports Apache and will set the REMOTE_USER
variable:

(0) Check that /etc/zulip/settings.py has
"zproject.backends.ZulipRemoteUserBackend" as the only enabled value
in the "AUTHENTICATION_BACKENDS" list, and that "SSO_APPEND_DOMAIN" is
correct set depending on whether your SSO system uses email addresses
or just usernames in REMOTE_USER.

Make sure that you've restarted the Zulip server since making this
configuration change.

(1) Edit /etc/zulip/zulip.conf and change the puppet_classes line to read:

puppet_classes = zulip::enterprise, zulip::apache_sso

(2) As root, run

/home/zulip/deployments/current/scripts/zulip-puppet-apply

to install our SSO integration.

(3) To configure our SSO integration, edit
/etc/apache2/sites-available/zulip-sso.example and fill in the
configuration required for your SSO service to set REMOTE_USER and
place your completed configuration file at

/etc/apache2/sites-available/zulip-sso

(4) Run

a2ensite zulip-sso

To enable the Apache integration site.

Now you should be able to visit https://zulip.yourdomain.net/ and
login via the SSO solution.

=======================================================================

Maintaining Zulip Enterprise:

* To upgrade to a new version, download the appropriate tarball from
  https://zulip.com/enterprise/download, and then run

  /home/zulip/deployments/current/scripts/upgrade-zulip <tarball>

  The upgrade process will result in some brief downtime for the
  service, which should be under 30 seconds unless there is an
  expensive transition involved, which would be mentioned in the
  release notes for the upgrade.  So we recommend doing upgrades at
  off hours.

* To update your settings, simply edit /etc/zulip/settings.py and then
  run /home/zulip/deployments/current/scripts/restart-server to
  restart the server

* You are responsible for running "apt-get upgrade" on your system on
  a regular basis to ensure that it is up to date with the latest
  security patches.

* To use the Zulip API with Zulip Enterprise, you will need to use the
  API endpoint of e.g. "https://zulip.yourdomain.net/api".  Our Python
  API examples support this via the
  "--site=https://zulip.yourdomain.net" argument.  The API bindings
  support it via putting "site=https://zulip.yourdomain.net" in your
  .zuliprc.

* Contact support@zulip.com for our Nagios plugin for monitoring the
  service's health as you move it into production.

* As a measure to mitigate the impact of potential memory leaks, the
  service automatically restarts itself once a week Sunday early
  morning.  See /etc/cron.d/restart-zulip for the precise
  configuration; if you'd like to change this setting, please be in
  touch with Zulip support on how to properly disable it (if you just
  delete the file, it will be re-added on the next Zulip upgrade).