问题
We are running BIND 9.9.7 on Centos 6.5 and for a long time I have been creating "hostless" DNS entries so that sites work with or without the www.
Eg:
www IN A 192.168.1.1
domain.com. IN A 192.168.1.1
However, our client wants to use a CNAME record to a cloudfront host and the "hostless" entry doesn't work as a CNAME record.
In fact, it more than doesn't work, BIND won't even load the zone file. The error is "failed: CNAME and other data"
domain.com. IN CNAME host.cloudfront.net.
www IN CNAME host.cloudfront.net.
It will load and resolve fine without the domain.com entry. I have tried a few variations, but nothing seems to work. including "", "."
Can anyone tell me the correct syntax for this entry?
回答1:
There is no correct syntax for this (and it is not BIND specific, it is a side effect of RFC1912 which states that A CNAME record is not allowed to coexist with any other data.
Detailed explanation: Why can't a CNAME record be used at the apex (aka root) of a domain?
Some DNS providers might offer workaround hacks.
来源：https://stackoverflow.com/questions/37141949/hostless-dns-cname-record