# Linux Operations Healthcheck Toolkit

This directory contains first-pass Linux diagnostics for common host checks. The scripts focus on health visibility, disk usage, service status, network troubleshooting, and lightweight reporting without making system changes.

## Diagram

```mermaid
flowchart TD
  A["os-healthcheck"] --> B["healthcheck.sh"]
  A --> C["disk_check.sh"]
  A --> D["service_check.sh"]
  A --> E["system_report.sh"]
  A --> F["network_troubleshoot.sh"]
```

## Scripts

- `healthcheck.sh` - consolidated host overview.
- `disk_check.sh` - threshold-based filesystem usage check.
- `service_check.sh` - service state validation for critical daemons.
- `system_report.sh` - timestamped report generation for quick evidence capture.
- `network_troubleshoot.sh` - local network, DNS, route, and connectivity checks.

## Usage

```bash
cd infra-run/scripts/bash/os-healthcheck

./healthcheck.sh
./disk_check.sh 90
./service_check.sh sshd nginx
./system_report.sh
./network_troubleshoot.sh 8.8.8.8
```

## Notes

- The toolkit is read-only and suited to initial triage.
- It aligns with the portfolio pattern of quick pre-check and evidence collection steps.