https://www.consul.io/docs/guides/external.html

https://aws.amazon.com/blogs/aws/keeping-time-with-amazon-time-sync-service/

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/set-time.html#configure-amazon-time-service

$ curl -X PUT -d '{
"Node": "aws-ntp",
"Address": "169.254.169.123",
"Service": {
"Service": "ntp"
}
}' http://localhost:8500/v1/catalog/register

nslookup of ntp.service.{{domain}} should now work.

you can then populate /etc/ntp.conf with ‘ntp.service.{{domain}}’ using consul templates.

In case you want to deregister this service from consul, run:

$ curl --request PUT --data @deregister.json http://localhost:8500/v1/catalog/deregister

where:

$ cat deregister.json
{
"Node": "aws-ntp",
"Address": "169.254.169.123",
"Service": {
"Service": "ntp"
}
}