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Subject

This chapter explains how to use the subject field correctly and outlines its primary purpose.

The subject is an identifier that allows you to group a service or multiple services that can be installed on a single unit or a group of units.
It helps manage deployment by logically linking related components under a common identifier.

Subject parameters​

  • ID — A unique identifier of the subject.

  • Priority — A value that determines the order in which services are allocated and deployed. Subjects with higher priority take precedence during resource distribution and node assignment. Value starting from 0.

  • Is Group — Defines how the subject can be used:

    • If set to Yes, the subject can be installed on multiple units.
      This is useful for grouping services that should run on a cluster of devices.

    • If set to No, the subject can only be assigned to a single unit at a time.
      To move it to another unit, you must detach it from the current unit before assigning it to the new one.

How to create subject​

  • Go to Subjects
  • Click + and fill in the subject properties.

Create subject

Assign unit to subject​

  • Select your subject and go to the Assigned units tab
  • Click Add unit
  • Enter the System Unit ID and click Add

Add unit

Add service to subject​

  • Select your subject and go to the Services tab
  • Click Add service
  • Choose one of the available services

Add service

Install subject to unit​

  • Go to Units
  • Select the unit you want to install the subject on from the list
  • Click Manage Subjects and add your subject to the unit

Install subject to unit

  • Press Update. The status should change to installed

Subject installed

Remove subject from unit​

  • Go to Units
  • Select the unit from which you want to remove the subject
  • Click Manage Subjects and click the cross icon next to the subject you want to remove from the list