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

Stop fighting with file permissions that deny your service account

🧩 The Challenge

You finally move your app into a subdirectory and suddenly it starts throwing permission denied errors, even though the parent directory looks fine. I have spent an entire Friday evening tracing this down only to realize a single directory in the path had restricted execution bits.

💡 The Fix

Use namei to walk the full path and show every permission bit from the root down to your target file. It saves you from guessing which directory in the chain is actually blocking your service user.

namei -l /path/to/your/application/config.yaml

⚙️ Why It Works

This utility recursively resolves every symlink and checks the permissions for each directory level, effectively unwrapping the path so you can see exactly where the chain breaks. It is much faster than running stat on every single directory manually.

🚀 Pro-Tip: Pipe the output to grep if you are dealing with a path that is forty directories deep.

Linux Tips & Tricks | © ngelinux.com | 9/27/2026