Table of Contents
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Introduction

TAD (Test And Diagnostic) monitors the amount of free memory available in the system at run time. It triggers the memory/Resource Reclamation (RR) process in TDM, when the amount of free memory drops below a configurable threshold. RR process can also be triggered by memory allocation failures which results in a notification being sent to TDM to try to reclaim memory.

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Self-heal stores Reset Count and Reboot Count.
Self-heal takes required action like: Rebooting the device, Restarting required process based on predefined conditions.
Self-heal does connectivity test.

Resource Monitoring and Process Monitoring

Selfheal

Selfheal – Resource Monitoring

Monitors the resources periodically (eg: 15 mins). If "Average Memory Used" reaches threshold value, necessary action will be executed. 

"resource_monitor.sh" script is used for monitoring Memory and CPU usage.
Located in the device path: "/fss/gw/usr/ccsp/tad/resource_monitor.sh".

Selfheal – Process Monitoring

Monitors the processes periodically (eg: 15 mins) based on process id (pid). Based on the process id availability, required action will be taken such as restarting the process, rebooting the device.

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Self-heal stores Reset Count and Reboot Count

Selfheal – Connectivity Test

Self-heal does connectivity test. Ping test will be done through server IP/URI (this needs to be configured). If server IP/URI is not configured, Ping test won't be executed and no action will be taken. If server is configured and ping test fails, reboot action will be executed.

"self_heal_connectivity_test.sh" script is used for ping test

Selfheal – Action

Self-heal takes the required action through "corrective_action.sh" script. This script has implementation of the actions.

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In Raspberry Pi the functionality of self-heal feature is provided by systemd.

Code Flow