Description

A user in mongodb/mongo-php-driver#968 encountered an exception attempting to use a hostname with less than two dots (e.g. "mongo" instead of "mongo.example.com") in conjunction with a mongodb+srv connection string scheme.

I was attempting to dig up documentation about the required format of the SRV host/domain string but was unable to find anything across the following:

• https://docs.mongodb.com/manual/reference/connection-string/#dns-seedlist-connection-format
• https://en.wikipedia.org/wiki/SRV_record
• https://tools.ietf.org/html/rfc2782

AFAIK, the only place we explicitly mention this requirement is in the driver specification.

Is this worth addressing in the MongoDB manual around existing SRV examples?

Scope of changes

• Update section to specify that the hostname *must* be <hostname>.<domain>.<TLD>. You cannot specify the hostname alone.
• Update section to specify that the individual SRV records must be in _mongodb.tcp.<hostname>.<domainname>.<TLD> format
• Backport to 3.6