16.2. Configuring a Pacemaker location constraint using rules

Use the following command to configure a Pacemaker constraint that uses rules.

# pcs constraint location rsc rule[resource-discovery=option] [role=promoted|unpromoted] [score=score | score-attribute=attribute] expression

The expression option in Pacemaker rules

The expression option can be one of the following where duration_options and date_spec_options are: hours, months, weeks, and years as described in the "Properties of a Date Specification" table in Pacemaker rules.

Durations in Pacemaker rules

Note that durations are an alternative way to specify an end for in_range operations by means of calculations. For example, you can specify a duration of 19 months. The supported values for duration options are seconds, minutes, hours, days, weeks, months, and years.

The following location constraint configures an expression that is true if now is any time in the year 2018.

# pcs constraint location Webserver rule score=INFINITY date-spec years=2018

The following command configures an expression that is true from 9 am to 5 pm, Monday through Friday. Note that the hours value of 16 matches up to 16:59:59, as the numeric value (hour) still matches.

# pcs constraint location Webserver rule score=INFINITY date-spec hours="9-16" weekdays="1-5"

The following command configures an expression that is true on Friday the thirteenth.

# pcs constraint location Webserver rule date-spec weekdays=5 monthdays=13