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diff --git a/docs/systems.rst b/docs/systems.rst
index e2bd588..e9e9e16 100644
--- a/docs/systems.rst
+++ b/docs/systems.rst
@@ -1,5 +1,9 @@
-Systems
-=======
+====================
+Non-Critical Systems
+====================
+
+Non-critical systems are those that are managed by the infrastructure
+administrator team.
.. toctree::
:maxdepth: 1
@@ -8,12 +12,18 @@ Systems
systems/arbitration
systems/blog
systems/board
+ systems/coaudit
+ systems/bugs
+ systems/cats
+ systems/email
systems/emailout
+ systems/git
systems/monitor
systems/webmail
+
General
--------
+=======
.. todo:: consider whether a central MySQL service should be setup
@@ -26,8 +36,48 @@ General
setup a central syslog service and install syslog clients in each container
+.. _setup_apt_checking:
+
+.. topic:: Setup package update monitoring for a new container
+
+ For Icinga to be able to check the update status of packages on you server
+ you need to install NRPE, a helper service. Install the necessary packages::
+
+ sudo aptitude install nagios-plugins-basic nagios-nrpe-server
+
+ Put :doc:`systems/monitor` on the list of allowed hosts to access the NRPE
+ service by adding the following line to :file:`/etc/nagios/nrpe_local.cfg`::
+
+ allowed_hosts=172.16.2.18
+
+ Tell the NRPE service that there is such a thing as the check_apt command by
+ creating the file :file:`/etc/nagios/nrpe.d/apt.cfg` with the following
+ contents::
+
+ # 'check_apt' command definition
+ command[check_apt]=/usr/lib/nagios/plugins/check_apt
+
+ # 'check_apt_distupgrade' command definition
+ command[check_apt_distupgrade]=/usr/lib/nagios/plugins/check_apt -d
+
+ Restart the NRPE service::
+
+ sudo service nagios-nrpe-server restart
+
+ Check that everything went well by going to https://monitor.cacert.org/,
+ going to the APT service on the host and clicking :guilabel:`"Re-schedule
+ the next check of this service"`. Make sure that :guilabel:`"Force Check"`
+ is checked and click :guilabel:`"Commit"`. Now you should see a page with a
+ green background. If not something went wrong, please contact the
+ :doc:`systems/monitor` administrators with the details.
+
+ That's it, now the package update status should be properly displayed in
+ Icinga.
+
+.. todo:: think about replacing nrpe with Icinga2 satellites
+
Checklist
----------
+=========
.. index::
single: etckeeper
@@ -48,5 +98,4 @@ Checklist
Pin: release a=stable
Pin-Priority: -1
-.. todo:: think about replacing nrpe with Icinga2 satellites
.. todo:: document how to setup the system-admin alias on the email system