Add initial Linux operations Bash toolkit with network diagnostics

2026-05-05 21:26:02 +00:00
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+# Linux Operations Bash Toolkit
+
+Small, practical Bash scripts for Linux operations checks and incident triage. The scripts are sanitized examples inspired by production Linux operations work and avoid destructive actions or root-only assumptions.
+
+## Scripts
+
+- `healthcheck.sh` - general host health overview.
+- `disk_check.sh` - filesystem usage threshold check.
+- `service_check.sh` - critical service status check.
+- `system_report.sh` - writes a timestamped system report to `/tmp`.
+- `network_troubleshoot.sh` - local and optional remote network diagnostics.
+
+## Usage
+
+```bash
+./healthcheck.sh
+./disk_check.sh
+./disk_check.sh 90
+./service_check.sh
+./service_check.sh sshd nginx zabbix-agent
+./system_report.sh
+./network_troubleshoot.sh
+./network_troubleshoot.sh google.com
+```
+
+## Exit Codes
+
+`disk_check.sh`:
+
+- `0` - all filesystems are below the threshold.
+- `1` - one or more filesystems are at or above the threshold.
+- `2` - invalid threshold input.
+
+`service_check.sh`:
+
+- `0` - all checked services are active.
+- `1` - at least one service is inactive, failed, missing, or cannot be checked.
+
+`network_troubleshoot.sh`:
+
+- `0` - no obvious local, DNS, or connectivity issue detected.
+- `1` - DNS, interface, gateway, or target connectivity problems detected.
+
+`healthcheck.sh` and `system_report.sh` are informational. They print warnings for missing tools where possible.
+
+## Notes
+
+- Requires Bash.
+- Designed for RHEL, Oracle Linux, and Ubuntu style systems.
+- Handles missing tools such as `ss`, `traceroute`, `nc`, and `journalctl` gracefully.
+- Does not require root and does not make system changes.