Custom DNS Resolution

Sometimes you need to access your application at a specific URL during the build.

As it is not possible to modify the /etc/hosts file or run your own DNS server on the build VMs, we recommend you use a wildcard DNS service instead.

There are a couple different services available for you to use, the two we would recommend are lvh.me and xip.io.

lvh.me

This service is very straight forward. Any request to a subdomain of lvh.me will resolve to 127.0.0.1.

$ nslookup database.lvh.me
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	database.lvh.me
Address: 127.0.0.1

xip.io

If you need more flexility with regards to the resolved IP address we recommend xip.io.

You can configure the IP address as part of the domain name. A name like www.127.0.1.1.xip.io will resolve to the 127.0.1.1 IP address.

$ nslookup database.127.0.0.1.xip.io
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	database.127.0.0.1.xip.io
Address: 127.0.0.1

In most cases this additional flexibility is not required, as you can’t modify the IPs of the build VMs. You can however make use of this with other loopback ip addresses.