AdGuard DNS vs AdGuard Home: which do you need
AdGuard DNS is a resolver AdGuard runs for you. AdGuard Home is one you run yourself. See which fits a phone or a household, and how to run it safely on a VPS.
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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.
The History of DNS, From HOSTS.TXT to DoH
How DNS grew from one shared hosts file into a signed, encrypted global system, and which old design choices still decide how your VPS resolves names.
Flush DNS cache on Ubuntu, and what else caches
Flush the DNS cache on Ubuntu with resolvectl, then find the copies a flush misses: nscd, nginx, Docker, the JVM and stale or negative answers held upstream.
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.
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.
DNSSEC fails after KSK-2024 rollover (key 38696)
Lookups ending in SERVFAIL since 11 October 2026? Check whether your resolver trusts root key tag 38696 with the RFC 8509 sentinel test, then fix the anchor.
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.
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.
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.
Mailcow on a VPS: self-host email Gmail accepts
Test outbound port 25 before installing mailcow: a block strands mail in the queue until it bounces. Then set DNS that stops Gmail's 550 5.7.25 PTR rejection.
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.
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.
Reverse DNS (PTR) on a VPS: Set It and Check It
Reverse DNS maps your VPS IP back to a name. Learn who sets the PTR record and how to check it with dig. Mail servers distrust an IP without a matching one.
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.
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.