[GitHub] kocolosk opened a new issue #1108: Query DNS to automatically discover cluster peers

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kocolosk opened a new issue #1108: Query DNS to automatically discover cluster peers
URL: https://github.com/apache/couchdb/issues/1108
 
 
   We can streamline cluster setup by querying DNS for an SRV record containing the hostnames of other cluster members. Service records are defined in [RFC 2782](https://www.ietf.org/rfc/rfc2782.txt) for this purpose but this is not a strictly academic exercise. As a practical example Kubernetes will create SRV records for members of a StatefulSet. I created a sidecar container that uses those SRV records to automatically join up the members of a StatefulSet here:
   
   https://github.com/kocolosk/couchdb-statefulset-assembler
   
   I think it would be interesting to push that logic down into mem3 directly. I'm envisioning a system that can be configured like so
   
   ```
   [mem3]
   use_dns_service_discovery = true
   service_record_name = _couchdb._tcp.example.net
   ```
   
   If a user omits the `service_record_name` CouchDB would attempt to generate the appropriate record for the query by prepending `_couchdb._tcp.` to the DNS domain name portion of the host / VM / container FQDN.

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