Feature Control

Overview

A system administrator can utilize a special configuration file after installing RightLink which will selectively disable certain features of RightLink on that machine. The intended use case is people who build custom images and want RightLink to behave in a certain way for their deployment environment. RightLink 6.0 and above contain a command line utility rs_config for setting these attributes. Attributes except "decommission timeout" take effect at boot time and are meant as options for image builders. Specifically, you can:

•  Disable managed login
•  Disable repo freezing
•  Disable MOTD (message of the day) update
•  Set a max time for decommission scripts bundle to run (default is 180 seconds)

Feature control is accomplished by creating a special YAMLfile after installing the RightLink package. The YAML file contains some boolean flags that affect the behavior of the init scripts and the RightLink agent during startup.

The following features can all be disabled:

• Managed login (aka Server Login Control)
• Frozen OS package repositories
• Automatic MOTD update on state transitions

Steps

To disable one or more of these features, create the following file:

/etc/rightscale.d/right_link/features.yml

And populate the file, supplying "true" or "false" for each feature as appropriate.

motd:
  update: false
package_repositories:
  freeze: false
managed_login:
  enable: false
decommission:
  timeout: 300

Important!  All features are assumed to be enabled by default unless this file exists and the associated feature is marked as "false" (disabled). Therefore, you can omit sections for features that should remain enabled.