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Use when working with DNS records, propagation debugging, or domain routing
Mit Codex oder Claude installieren Kopieren Sie diesen Prompt, fügen Sie ihn in Codex, Claude oder einen anderen Assistant ein und lassen Sie die Skill-Seite prüfen und installieren.
Basierend auf der SOC-Berufsklassifikation
Use before any DevOps build, change, or new feature — refine requirements through dialogue before touching infrastructure or code
Use when working with Docker — building images, writing Dockerfiles, debugging container issues
Use to execute a written implementation plan via subagents with review checkpoints
Use when implementation is complete, all tests pass, and you need to decide how to integrate the work - guides completion of development work by presenting structured options for merge, PR, or cleanup
Use when working with Kubernetes or Helm — authoring, reviewing, hardening, or debugging manifests, Deployments, Services, Ingress, RBAC, NetworkPolicy, or cluster operations
Use when receiving code review feedback, before implementing suggestions, especially if feedback seems unclear or technically questionable - requires technical rigor and verification, not performative agreement or blind implementation
| name | dns-and-domains |
| description | Use when working with DNS records, propagation debugging, or domain routing |
# Basic lookup
dig example.com
dig example.com A # A record (IPv4)
dig example.com AAAA # IPv6
dig example.com CNAME # CNAME
dig example.com MX # mail
dig example.com TXT # text records (SPF, DKIM, etc.)
dig example.com NS # nameservers
# Query a specific DNS server
dig @8.8.8.8 example.com
# Check propagation (query authoritative nameserver directly)
dig example.com NS # get nameservers
dig @<nameserver> example.com # query authoritative NS
# Reverse lookup (IP → hostname)
dig -x 1.2.3.4
| Symptom | Cause | Fix |
|---|---|---|
| NXDOMAIN | Record doesn't exist | Create the record |
| Old IP after update | TTL not expired yet | Wait, or lower TTL before changes |
| Works on some networks, not others | Propagation still in progress | Wait up to 48h |
| CNAME conflict | CNAME at root/apex (not allowed) | Use ALIAS/ANAME record instead |
| SSL cert error after DNS change | Old IP cached | Flush local DNS cache |
# Check from multiple locations
dig @8.8.8.8 example.com # Google
dig @1.1.1.1 example.com # Cloudflare
dig @9.9.9.9 example.com # Quad9
# Local DNS cache flush
# macOS
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
# Linux
sudo systemd-resolve --flush-caches
# Windows
ipconfig /flushdns
| Type | Use |
|---|---|
A | Maps hostname → IPv4 address |
AAAA | Maps hostname → IPv6 address |
CNAME | Alias of another hostname (not at root) |
MX | Mail server for the domain |
TXT | Text data — SPF, DKIM, verification tokens |
NS | Nameservers for the domain |
SOA | Start of authority — zone metadata |
PTR | Reverse DNS (IP → hostname) |