arm332
By:
arm332

How to setup FQND hostname when using a DNS wildcard A record?

May 7, 2016 344 views
DNS Networking Ubuntu

Following this tutorial How To Set Up a Host Name with DigitalOcean, my droplet is setup as:

Droplet IP: 1.2.3.4
Droplet name: example1

Domain: example1.com

A record name: @
A record IP: 1.2.3.4
A record: example1.com. 1800 IN A 1.2.3.4

CNAME name: *
CNAMe hostname: EXAMPLE1.COM.
CNAME: *.example1.com. 1800 IN CNAME example1.com.

$ hostname
example1

$ hostname -f
example1

$ cat /etc/hosts
127.0.0.1 localhost
127.0.0.1 example1

I know is tricky, but I will add a MX record mail1.example1.com and setup Postfix, Dovecot etc. on the same droplet.

Can I just add to /etc/hosts, something like "1.2.3.4 mail1.example1.com mail1" or that will not work?

Will I get in trouble with that DNS wildcard A record?

Thank you,
André

PS: I'm not using IPv6

1 Answer
JamesMC June 22, 2016
Accepted Answer

Hello,

You should be fine setting up the hostname record you offered. You will also want to likely name the droplet mail1.example1.com as well, so your PTR shows up as that instead of example1.

The PTR of your IP address is based on the droplet name, and plays an important part of mail delivery.

Have another answer? Share your knowledge.