Server Operations
Networked Services: DNS, Mail, and TLS Basics
Stand up DNS zones, cautious mail relay patterns, and TLS lifecycles with staging discipline that avoids surprise outages.
JPY 33,000 informational tuition reference
Talk with intakeWhat this arc covers
Classic networked services still break teams when treated as folklore. You will configure authoritative and recursive DNS with explicit testing steps, walk through modern SMTP submission paths without turning labs into spam factories, and renew certificates with staging validation. Every lab ends with a rollback note so you can mirror the same caution at work.
Feature stack
- DNS delegation exercises with deliberate misconfiguration recovery
- SMTP submission labs using authenticated relay only
- Cert issuance with staging ACME endpoints first
- TLS cipher suite selection without cargo-cult lists
- Monitoring hooks for expiry and DNSSEC readiness checks
- Documentation templates for change windows
- Cross-team handoff scripts for application owners
Outcomes you can demonstrate
- Ship a DNS change sheet with propagation checkpoints
- Rotate a certificate without downtime using staged validation
- Describe mail flow using simple sequence diagrams
Responsible lead
Yuki Taneda
Linux Instructor with a background in carrier-grade DNS operations.
Learner notes
DNS week felt dense, but the misconfiguration recovery drill is the clearest exercise I have done online.
Omar · Infrastructure apprentice · HarborRail · 4/5 · Trustpilot
TLS renewal lab mirrored our production balancer quirks. Coaches nudged me toward staging-first habits I now enforce at work.
Aya · 5/5 · survey
Practical questions
We cover dual-stack basics and common pitfalls. Deep BGP topics are intentionally out of scope.
Labs use closed-loop mail sinks. You cannot accidentally relay to the public internet from our sandbox.
A laptop with 16GB RAM is comfortable. 8GB works if you close unrelated browser tabs during VM windows.