FGS – ShutDown: A Complete Step-by-Step Implementation Guide
Implementing a clean, automated shutdown sequence for a Field Ground Station (FGS) is critical to prevent data corruption, protect sensitive hardware, and ensure rapid reboot capabilities. This guide provides a direct, technical walkthrough for deploying the FGS-ShutDown script architecture across your network nodes. Phase 1: Prerequisites and Environment Setup
Before executing the shutdown sequence, you must verify system dependencies and user permissions across all targeted FGS modules. System Requirements Operating System: RHEL 8+ or Ubuntu 20.04 LTS+
Privileges: Root or explicit Sudoers access for the execution user
Dependencies: systemd, openssh-client, tmux (for detached session monitoring) Configure Sudoers Access
To allow the automation script to trigger the shutdown power state without manual password entry, append the following line to your /etc/sudoers file or a dedicated drop-in file under /etc/sudoers.d/fgs-automation:
fgs_admin ALL=(ALL) NOPASSWD: /usr/sbin/shutdown, /usr/sbin/reboot, /usr/bin/systemctl Use code with caution. Phase 2: Core Script Implementation
The FGS-ShutDown architecture relies on a master control script that orchestrates service termination before cutting system power.
Create a file named /opt/fgs/bin/fgs-shutdown.sh and insert the following production-grade bash script: