Should private DNS mode be on or off?
Private DNS mode should be on, set to a hostname you chose. Here is what the toggle does, when it breaks wifi logins or internal names, and how to tell.
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How to self-host a website (home or VPS)
Pick home or a VPS first, then put a static site live on nginx: server block, DNS record, firewall rule and TLS certificate, and what changes for an app.
What is private DNS, and how to run your own
Private DNS is Android's name for DNS over TLS. What it hides from your network, what it does not, and how to run your own resolver on a VPS with Unbound.
Adopt UniFi devices to a VPS controller
Broadcast discovery stops at the first router. Here is how to point remote UniFi access points at a controller on your VPS, and keep port 8080 private.
Moving from shared hosting to a VPS
Move off shared hosting without breaking the site: the inventory cPanel was hiding, a rehearsed cutover, low DNS TTLs, and why mailboxes stay put.
How to Migrate a Server to a New VPS
Move a live server to a new VPS as a rehearsed cutover: inventory, rebuild instead of clone, dump the database, lower DNS TTL early, verify, then switch.
What is DNS? A server owner's guide
DNS decides whether your domain reaches your VPS. Learn the records, nameservers, TTL and the caching that makes a DNS change look like it failed.
Fix DNS over WireGuard: three failure modes
Your WireGuard tunnel is up but names do not resolve, or the queries leak to the local router. Find which of the three DNS failures you have, and fix it.
Docker Compose networking explained
The default project bridge, DNS by service name, when host mode is worth it, sharing one network across projects, and the published port that skips UFW.
Certbot wildcard certificates with DNS-01
Issue a wildcard certificate with Certbot using the DNS challenge. How the TXT record proof works, which plugin to install, and how renewal stays automatic.
Mailcow on a VPS: self-host email Gmail accepts
Test outbound port 25 before installing mailcow: a block means mail never leaves the queue. Then set the DNS that stops Gmail's 550 5.7.25 PTR rejection.