system health checks

Explains how to build smart Bash-based health checks for Linux systems. Covers probing CPU, memory, disk, services, network, and logs; defining thresholds; parsing outputs; exit codes; structured logging; alerts via mail/Slack; self-healing hooks; cron/systemd timers; modular functions; portability and security (sudo, permissions). Includes example scripts and tips for testing and CI.

Shows how to build intelligent, portable Bash health checks that move beyond simple pings: modular probes for CPU, memory, disk I/O, network, services, and logs; configurable thresholds, sane exit codes, and alerting; JSON/CSV outputs; cron/systemd scheduling; retries and backoff; secure, idempotent patterns with reusable snippets that plug into CI/CD and common monitoring stacks.