There is a video for this solution.

Requirements :

1. Google Cloud account ready and activated.

2. Your own fully functional FQDN.

Here is the process:

Step by step to add a CAA record on Google Cloud DNS:

1.Login to your Google Cloud

2. On the Google Cloud Platform, go to  Network Services and then select Cloud DNS to open the Cloud DNS administration page.

3. The Google Cloud DNS configuration site will be opened. You will see your current zone record inside this page. For example below is entrustzonelab.

5. Click on your Zone name, the detail settings information for your zone record will be opened.

6. Click on Add Record Set. Type the below entries to the record:

DNS Name :	Your domain name. Example: .entrustzonelab.com.
Resource Record Type :	CAA
Certificate Authority Authorization:	0 issue “entrust.net” 0 issue “d-trust.net” 0 issuewild “d-trust.net”

7. Click on the Create button to save the entry and at this point your CAA record has been created inside your zone file.

NOTE:

If your organization currently uses “entrust.net” for your CAA record, we recommend adding a separate CAA record for D-Trust. Valid values are:

d-trust.net

d-trust.de

Example:

0 issue “d-trust.net”

0 issuewild “d-trust.net”

8. If you have a dig tool from BIND, you can use it to check your CAA entry by typing the command below:

<drive>Dig yourdomain type257

NOTE: To download the Dig tool you can visit the official site of ISC :

https://www.isc.org/downloads/

If you have any questions or concerns please contact the Entrust Certificate Services Support department for further assistance:

Hours of Operation:
Sunday 8:00 PM ET to Friday 8:00 PM ET
North America (toll free): 1-866-267-9297
Outside North America: 1-613-270-2680 (or see the list below)
NOTE: Smart Phone users may use the 1-800 numbers shown in the table below.
Otherwise, it is very important that international callers dial the UITF format exactly as indicated. Do not dial an extra "1" before the "800" or your call will not be accepted as an UITF toll free call.

Country	Number
Australia	0011 - 800-3687-7863 1-800-767-513
Austria	00 - 800-3687-7863
Belgium	00 - 800-3687-7863
Denmark	00 - 800-3687-7863
Finland	990 - 800-3687-7863 (Telecom Finland) 00 - 800-3687-7863 (Finnet)
France	00 - 800-3687-7863
Germany	00 - 800-3687-7863
Hong Kong	001 - 800-3687-7863 (Voice) 002 - 800-3687-7863 (Fax)
Ireland	00 - 800-3687-7863
Israel	014 - 800-3687-7863
Italy	00 - 800-3687-7863
Japan	001 - 800-3687-7863 (KDD) 004 - 800-3687-7863 (ITJ) 0061 - 800-3687-7863 (IDC)
Korea	001 - 800-3687-7863 (Korea Telecom) 002 - 800-3687-7863 (Dacom)
Malaysia	00 - 800-3687-7863
Netherlands	00 - 800-3687-7863
New Zealand	00 - 800-3687-7863 0800-4413101
Norway	00 - 800-3687-7863
Singapore	001 - 800-3687-7863
Spain	00 - 800-3687-7863
Sweden	00 - 800-3687-7863 (Telia) 00 - 800-3687-7863 (Tele2)
Switzerland	00 - 800-3687-7863
Taiwan	00 - 800-3687-7863
United Kingdom	00 - 800-3687-7863 0800 121 6078 +44 (0) 118 953 3088