Last updated: April 21. 2016
Check_MK distinguishes between the configuration environment in which
you maintain hosts, services and settings, and monitoring, in which the
actual operative monitoring takes place.
Changes in the configuration - e.g. adding a new host - will initially have no
effect on the monitoring. First with an Activate Changes will all the
changes accumulated since the last action be simultaneously activated. This
might seem a little cumbersome, but it does have the advantage that more
complex changes can be prepared without haste before being put into production.
For example, after adding a new host you might want to define thresholds or
remove some services before 'arming' the new component.
The tool for configuring Check_MK via GUI is called the WATO (Web Adminitration Tool).
WATO maintains all configurations in a conventional text data format which
experienced users can edit manually or even create with scripts. WATO can be
accessed via the corresponding element in the sidebar. This element is
included as standard and offers direct access to all WATO modules.
Whenever you make a change to the monitoring configuration using WATO, this
change will at first be picked up and held as pending. Such changes can be
identified by the button in the WATO modules
and respectively the button in the sidebar. Both of
these buttons open a list of the changes:
With the Activate Changes button the configuration data from WATO will be
used to generate a new configuration for the monitoring core, and instruct the
core to immediately begin using the new configuration:
The list of pending changes is subsequently cleared. These entries are not lost
however, they can be called up with the Audit Log button. Here you can find
a log file of all changes that have been made using WATO.
Whenever you activate changes, WATO automatically creates a backup of the
configuration. The list of these backups is accessed via the WATO module
Backup & Restore:
A click on (details of a snaphot), and then a click on
Restore Snapshot copies this back into the configuration.
Important note: Only the configuration will be restored - the monitoring's
state and history will not be affected.
3. Important WATO modules
WATO includes numerous modules - one for each important aspect of Check_MK.
The following modules are particularly important:
||A list of all WATO modules, each with a short description
||Here you will find Check_MK agents for Linux, Windows and other operating
systems. In the Check_MK Enterprise Edition you can also configure, packetise and automatically
update the agents via WATO.
||Management of the hosts to be monitored - perhaps the most important module.
||Global settings - those that do not apply to specific hosts, services or
|| Host & Service Parameters
||All settings for specific hosts or services are found here. The configuration
procedure is rule based.
4. Quick access
Once you have worked longer with WATO you will know the icons off by heart.
Then the smaller version of the WATO menu for the sidebar can be recommended: