Permissions & Security (Chmod/Chown/ACLs/SELinux/AppArmor)

Stop chasing your tail with unexpected SELinux denials

🧩 The Challenge

Everyone has dealt with a service that simply refuses to start, and nine times out of ten, you find an AVC denial in your logs that makes zero sense. You spend hours toggling things off and on, feeling like an idiot because you cannot figure out which specific context is blocking the file access.

💡 The Fix

Use the audit2allow tool to parse your log entries and spit out exactly what rules you need to add to your local policy module. It keeps you from having to set the whole system to permissive mode just to get a database running.

grep "denied" /var/log/audit/audit.log | audit2allow -M my_custom_fix
semodule -i my_custom_fix.pp

⚙️ Why It Works

This approach automatically generates a custom policy module by analyzing the specific denial messages captured in the audit logs. It effectively bridges the gap between what the kernel is blocking and what your application actually needs to function.

🚀 Pro-Tip: Run audit2why on the raw log message first if you want to understand the policy logic instead of just blindly patching it.

Linux Tips & Tricks | © ngelinux.com | 8/23/2026