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test: sandboxed docker-compose stack for plugin smoke testing

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Brings up a parallel CoreDNS instance on ports 11053/19153 with a
single test.example.com zone. Useful for verifying the custom image
builds and the rfc2136 plugin accepts/applies UPDATEs end-to-end
before touching production zones.

Already validated the msgAcceptFunc override fix end-to-end via
nsupdate, with the auto plugin re-serving the new record within 5s.

Note: zones/test.example.com.zone gets rewritten by the plugin
during testing. If perms get hosed (docker writes as root), run
sudo chown -R rpm:rpm test/zones/ to reclaim.
This commit is contained in:
Ryan Malloy 2026-05-21 12:17:49 -06:00
parent 47c8ff42e9
commit 3dd99fa81a
4 changed files with 138 additions and 0 deletions
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8
test/zones/test.example.com.zone Normal file
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; Auto-written by coredns-rfc2136 on 2026-05-21T17:59:46Z
; Zone: test.example.com.
$ORIGIN test.example.com.
test.example.com. 3600 IN SOA ns.test.example.com. admin.test.example.com. 2026052103 300 120 604800 60
test.example.com. 3600 IN NS ns.test.example.com.
ns.test.example.com. 3600 IN A 127.0.0.1
token.test.example.com. 60 IN TXT "validation-1"
fresh.test.example.com. 60 IN TXT "msgAcceptFunc-fix-works"