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Optional-Feature-Control.md

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SONiC Optional Feature Control Enhancement

Revision

Rev Date Author Change Description
0.1 10/10/19 Pradnya Mohite Initial version

Scope

Add support to enable/disable features in sonic. Features like telemetry agent can be optional and this enhancement will provide a way to control that.

Implementation Details

  • Add feature table in config db.
    • Modify sonic-cfggen tool to add table and enable the telemetry feature by default.
    • For each feature, key is FEATURE|feature name, status :enabled/disabled.
  • Add "config feature enable|disable [feature name]" command line.
    • Add support for show and config commands.
  • Add feature in hostcfgd to listen for Config DB FEATURE table entry changes, and enable & start or stop & disable the respective service as appropriate.
    • When hostcfgd first starts, it reads all entries in the FEATURE table and compares with current status of each service. If there is mismatch, hostcfgd will enable & start or stop & disable as appropriate.