Knowledge base for software setup, errors, and daily tool work.

How to Merge a Git Detached HEAD Back to Master

If you see a message like 'You are in 'detached HEAD' state' after checking out a...

How to Free Up Disk Space for Docker: No Space Left on Device

When Docker throws a no space left on device error, it usually means your Docker sto...

How to Set Up a Wildcard Subdomain DNS Record in Cloudflare

If you need all subdomains (e.g., *.example.com) to point to the same IP or service, a wildcard D...

Fix DNS Probe Finished NXDOMAIN Error in Windows 10

When you see "DNS_PROBE_FINISHED_NXDOMAIN" in Chrome or other browsers, it means the DNS ...

Fix pnpm ERR! Cannot Find Module – Practical Steps

Nginx Upstream Connection Refused: Diagnosis and Fixes

When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...