[GitHub] [trafficcontrol] bakerolls opened a new pull request #3411: CIAB: Export UDP ports for the DNS

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bakerolls opened a new pull request #3411: CIAB: Export UDP ports for the DNS
URL: https://github.com/apache/trafficcontrol/pull/3411
 
 
   ## Which issue is fixed by this PR? If not related to an existing issue, what does this PR do?
   
   By default, [Docker only exposes TCP](https://docs.docker.com/compose/reference/port/) but most DNS servers use UDP. The protocol can be specified by [appending `/protocol` to the exposed port](https://docs.docker.com/compose/compose-file/compose-file-v2/#ports). In case TCs DNS switches to TCP in the future, both protocols are specified.
   
   Since this is a very small change that does not modify any code or functionality, I hope it can be reviewed without being discussed on the mailing list.
   
   ## Which TC components are affected by this PR?
   
   - [ ] Documentation
   - [ ] Grove
   - [ ] Traffic Analytics
   - [ ] Traffic Monitor
   - [ ] Traffic Ops
   - [ ] Traffic Ops ORT
   - [ ] Traffic Portal
   - [ ] Traffic Router
   - [ ] Traffic Stats
   - [ ] Traffic Vault
   - [x] CDN in a Box
   
   ## What is the best way to verify this PR? Please include manual steps or automated tests.
   ### (If no tests are part of this PR, please provide explanation as to why no tests are included.)
   
   Start CIAB as described in its readme, then use dig to test the DNS:
   
   ```
   $ docker-compose -f docker-compose.yml -f docker-compose.expose-ports.yml up -d
   $ dig @127.0.0.1 -p 3053 video.demo1.mycdn.ciab.test
   ```
   
   
   ## Check all that apply
   
   - [ ] This PR includes tests
   - [ ] This PR includes documentation updates
   - [ ] This PR includes an update to CHANGELOG.md
   - [ ] This PR includes all required license headers
   - [ ] This PR includes a database migration (ensure that migration sequence is correct)
   - [ ] This PR fixes a serious security flaw. Read more: [www.apache.org/security](http://www.apache.org/security/)
   
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