DNS Records Every Web Deployment Needs
Apex, www, MX, TXT for verification, and CAA records explained for launch checklists.
Before you point production traffic
DNS mistakes cause intermittent outages that look like application bugs. Document required records before changing nameservers or A records.
Vcom Web Tech verifies TTL lowering before migrations so rollback propagates quickly.
Use separate staging subdomains to test TLS and redirects before apex cutover.
Web records
A and AAAA records point apex domains to VPS or load balancers. CNAME www to apex or to CDN endpoints per provider guidance.
Avoid CNAME at apex when your DNS provider lacks ALIAS/ANAME support; use A records or provider-specific flattening.
Include IPv6 when your stack supports it to avoid broken paths for v6-only clients.
Mail and authentication TXT
MX records must reflect actual mail routing. SPF and DKIM TXT records belong in DNS before sending.
Domain verification TXT for Google Search Console, Microsoft 365, and ESPs should be tracked in a registry spreadsheet.
CAA records restrict which CAs may issue certificates for your domain.
Validation
Use dig from multiple regions to confirm propagation. Cache old records at resolvers delay cutovers.
After changes, run SSL checks and mail authentication tests.
Store DNS export backups before major refactors.
Additional operational notes
Operational excellence on Linux hosting requires documenting every change to Nginx, systemd, PM2, Docker, and DNS in a runbook your team shares. Vcom Web Tech clients benefit when staging environments mirror production firewall rules, TLS versions, and mail authentication so surprises appear before customers notice. Schedule quarterly reviews of backups, certificate expiry, DMARC reports, and monitoring alerts even when traffic feels stable.
When incidents occur, capture timelines and root causes in blameless postmortems. Patterns from past 502 errors, failed renewals, or bounce spikes inform checklists for the next deployment. Training new team members on SSH access, log locations, and escalation paths reduces dependency on single maintainers.
Security patches, dependency upgrades, and framework migrations should ride the same CI pipelines that deploy application code. Automate smoke tests that hit health endpoints and send test mail through staging SMTP relays. Small consistent investments beat heroic firefighting during launch weekends.
Capacity planning matters on VPS hosts where vertical scaling has limits. Watch disk inode usage, connection counts, and database connection pools as traffic grows. Proactive upgrades cost less than emergency migrations during peak sales or campaign sends.
Finally, communicate with stakeholders using plain language about risk, downtime windows, and deliverability metrics. Technical depth supports trust when email authentication or deployment strategy changes affect revenue-facing systems.
Additional operational notes
Operational excellence on Linux hosting requires documenting every change to Nginx, systemd, PM2, Docker, and DNS in a runbook your team shares. Vcom Web Tech clients benefit when staging environments mirror production firewall rules, TLS versions, and mail authentication so surprises appear before customers notice. Schedule quarterly reviews of backups, certificate expiry, DMARC reports, and monitoring alerts even when traffic feels stable.
When incidents occur, capture timelines and root causes in blameless postmortems. Patterns from past 502 errors, failed renewals, or bounce spikes inform checklists for the next deployment. Training new team members on SSH access, log locations, and escalation paths reduces dependency on single maintainers.
Security patches, dependency upgrades, and framework migrations should ride the same CI pipelines that deploy application code. Automate smoke tests that hit health endpoints and send test mail through staging SMTP relays. Small consistent investments beat heroic firefighting during launch weekends.
Capacity planning matters on VPS hosts where vertical scaling has limits. Watch disk inode usage, connection counts, and database connection pools as traffic grows. Proactive upgrades cost less than emergency migrations during peak sales or campaign sends.
Finally, communicate with stakeholders using plain language about risk, downtime windows, and deliverability metrics. Technical depth supports trust when email authentication or deployment strategy changes affect revenue-facing systems.