Problem Statement: Ensure that critical domains (e.g., APIs, internal tools, external services) resolve correctly and are not experiencing DNS issues.
Detailed Scenario: SREs often depend on DNS working correctly for service availability. A DNS health checker script can verify domain resolution, TTL, and optionally check propagation across public resolvers (Google, Cloudflare, etc.).
Use Case Approach: Read list of domains from a file, Check A/AAAA, CNAME, TTL value, and response time, Optionally compare resolution from different DNS servers
Tools and Modules: dnspython, argparse, logging, csv
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Approach:
- Read list of domains from a file.
- Check A/AAAA, CNAME, TTL value, and response time.
- Optionally compare resolution from different DNS servers.
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