DNS設定

1

Setting Up DNS for Your Domain

A complete walkthrough for setting up DNS records on a new domain — A, CNAME, MX, TXT and more — with clear practical steps for developers and site owners.

5 分で読める

2

A Record vs CNAME: When to Use Each

Understand when to use a DNS A record vs a CNAME — the right choice for each scenario, performance trade-offs, and why CNAME at the root domain causes problems.

4 分で読める

3

MX Records: Setting Up Email for Your Domain

Configure MX records to route email — covers priority, fallback servers, and step-by-step setup for Google Workspace, Microsoft 365, and custom mail servers.

4 分で読める

4

TXT Records: SPF, DKIM, and DMARC Explained

Set up SPF, DKIM, and DMARC TXT records to protect your domain from email spoofing and improve deliverability. Step-by-step DNS instructions included.

4 分で読める

5

Understanding DNS Propagation

Learn why DNS changes take time to propagate globally, how TTL controls propagation speed, and tools to monitor DNS record updates from multiple global

4 分で読める

6

Pointing Your Domain to Web Hosting

How to point your domain name to web hosting — shared hosting, VPS, WordPress hosts, and services like Vercel or Netlify — with DNS record instructions.

4 分で読める

7

CAA Records: Controlling SSL Certificate Issuance

CAA records restrict which CAs may issue SSL certs for your domain. Use issue, issuewild, and iodef tags to lock down issuance and prevent certificate fraud.

3 分で読める

8

SRV Records Explained

SRV records encode service, protocol, port, and priority into DNS. Learn to configure them for SIP, XMPP, Microsoft 365, Minecraft, and application

4 分で読める

9

Wildcard DNS Records

Wildcard DNS records match any subdomain not explicitly configured. Learn how they work, when to use them, and their limitations for SSL certificates and

3 分で読める

10

DNS TTL: Choosing the Right Value

TTL controls how long resolvers cache DNS records. Learn the right value per record type, when to pre-lower TTLs before migrations, and caching pitfalls to

4 分で読める

11

Reverse DNS and PTR Records

Reverse DNS maps IPs to hostnames via PTR records. Learn why it matters for email deliverability and how to set PTR records at DigitalOcean, Linode, and AWS

3 分で読める

12

Cloudflare DNS Setup Guide

How to set up Cloudflare DNS — add nameservers, configure records, choose proxy vs DNS-only mode, and enable DNSSEC for cryptographic domain verification.

4 分で読める

13

DNS During Domain Migration

A step-by-step guide to managing DNS during domain migrations — changing hosts, switching DNS providers, or moving nameservers — with minimal downtime.

4 分で読める

14

DNS Troubleshooting Guide

Fix DNS problems: stale records, email failures, unreachable sites, SSL errors, NXDOMAIN. Uses dig commands with step-by-step troubleshooting for each issue.

5 分で読める

15

Multi-Domain DNS Management

Best practices for managing DNS across many domains — using a single DNS provider, bulk record management, automation, and avoiding configuration drift.

5 分で読める