smp-py: alias microwave.box instead of duplicating its addresses - #26
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33cb842 duplicated microwave.box's A/AAAA at smp-py to keep the door open for an SRV target naming smp-py, since RFC 2782 forbids a target from resolving through an alias. That door was never used -- the SRV targets microwave.box directly -- while the predicted renumbering cost came due for real: f3b0ab0 moved microwave.box's AAAA and missed smp-py, and 14ce20c had to clean it up. A CNAME makes that drift impossible; renumbering the Droplet is now a hosts-box.yaml-only change. Nothing changes for clients. The SRV lives at _minecraft._tcp.smp-py, a different owner name, so it coexists with the alias (CNAME is not DNAME) and Java clients keep resolving through it; clients that skip SRV -- explicit host:port connects, Bedrock, naive pingers -- chase the alias to the same addresses. Going SRV-only instead was considered and rejected for exactly those clients: the Java client only consults SRV for portless addresses. The rule the alias does impose, SRV targets keep naming microwave.box and never smp-py, is now a comment in the file. Still unproxied: Cloudflare's HTTP proxy does not carry TCP/25565. Claude-Session: https://claude.ai/code/session_01T6ZEghUNVjxqHrDS134XwK Co-authored-by: Claude <noreply@anthropic.com>
OctoDNS Plan for
|
| Operation | Name | Type | TTL | Value | Source |
|---|---|---|---|---|---|
| Delete | smp-py | A | 300 | 146.190.196.51 | |
| Delete | smp-py | AAAA | 300 | 2604:a880:400:d1:0:4:e4cf:6001 | |
| Create | smp-py | CNAME | 300 | microwave.box.letsbuilda.dev. | zone_config |
Summary: Creates=1, Updates=0, Deletes=2, Existing=13, Meta=False
The RFC 2782 rationale lives in the commit history; the record stands on its own. Claude-Session: https://claude.ai/code/session_01T6ZEghUNVjxqHrDS134XwK Co-authored-by: Claude <noreply@anthropic.com>
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Replaces smp-py's duplicated A/AAAA pair with a single CNAME to
microwave.box.letsbuilda.dev., so renumbering the Droplet is ahosts-box.yaml-only change.Why this is safe
#19 chose duplication over a CNAME citing RFC 2782, but that rule constrains the SRV target — which is
microwave.boxand stays an address record.smp-pyitself is not an SRV target, so aliasing it violates nothing. The one rule the alias imposes: SRV targets must keep namingmicrowave.box, neversmp-py.Meanwhile the predicted renumbering cost came due for real: #23 moved microwave.box's AAAA and missed smp-py, and #25 had to clean it up. The CNAME makes that class of drift impossible.
Client behavior is unchanged
_minecraft._tcp.smp-py, a different owner name, so it coexists with the alias (CNAME is not DNAME) and Java clients keep resolving through it.host:portconnects, Bedrock, naive pingers — chase the alias to the same addresses. (SRV-only was considered and rejected for exactly these: the Java client only consults SRV for portless addresses.)Verification
octodns-validate --config-file=dns/production.yamlpasses locally.smp-py.letsbuilda.dev.dig +short smp-py.letsbuilda.dev A/AAAAresolves via the CNAME to 146.190.196.51 /2604:a880:400:d1:0:4:e4cf:6001; the SRV answer is unchanged. No downtime — the alias lands on the same addresses cached records held.🤖 Generated with Claude Code
https://claude.ai/code/session_01T6ZEghUNVjxqHrDS134XwK