This post just simply describes how to create a wildcard DNS record e.g.
*.wildcard.test.com using dnsmasq.
Dnsmasq has low requirements for system resources, can run on Linux, BSDs, Android and OS X, and is included in most Linux distributions. Consequently it "is present in a lot of home routers and certain Internet of Things gadgets" and is included in Android.
First of all, you need to install dnsmasq service on a server which will be used as your DNS server
# yum -y install dnsmasq
After dnsmasq is successfully installed, start and enable the service.
# systemctl start dnsmasq # systemctl enable dnsmasq
By default, dnsmasq service read
/etc/hosts to resolve a hostname. Therefore, in order to add records to your DNS server running dnsmasq, you just need to add records
/etc/hosts in the DNS server as below.
# cat /etc/hosts 127.0.0.1 localhost 10.10.10.10 dnstest.com
After that, restart dnsmasq service.
# systemctl restart dnsmasq
Then, you can resolve the name
dnstest.com with the DNS server.
Login to another server and test the following command to check if the name can be resolved as expected.
# nslookup dnstest.com [your dns IP address] Server: [your dns IP address] Address: [your dns IP address]#53 Name: kimitest.com Address: dnstest.com
No matter what you are doing, the easier the better. So I just add the following line to add wildcard record to
/etc/hosts. (But it didn't work.)
# cat /etc/hosts 127.0.0.1 localhost 10.10.10.10 dnstest.com 22.214.171.124 *.wildcardtest.com
nslookup returned the result below.
# nslookup test.wildcardtest.com [your dns IP address] Server: [your dns IP address] Address: [your dns IP address]#53 ** server can't find test.wildcardtest.com: NXDOMAIN
On the otherhand, the following command worked. It was not what I expected and completely meaningless.
# nslookup *.wildcardtest.com [your dns IP address] Server: [your dns IP address] Address: [your dns IP address]#53 Name: *.wildcardtest.com Address: 126.96.36.199
So, how should wildcard records be added to a dnsmasq server properly?
Let's say you want both
test2.wildcardtest.com, or whatever hostname with the domain
wildcardtest.com, to be resolved to
It is very simple. Just add the following line to your
Or, you can also add the same line to a file under the directory
/etc/dnsmasq.d/ like below. Either way works.
As long as the file is put under the directory, you can set no matter what name to the conf-file. Automatically dnsmasq reads the files under the directory and set the configurations to its service.
# cat /etc/dnsmasq.d/wild-local address=/wildcardtest.com/100.100.100.100
By setting the wildcard record,
*.wildcardtest.comis going to be resolve to
Here is the result of testing the wildcard record.
# nslookup test1.wildcardtest.com [your dns IP address] Server: [your dns IP address] Address: [your dns IP address]#53 Name: test1.wildcardtest.com Address: 100.100.100.100 # nslookup test2.wildcardtest.com [your dns IP address] Server: [your dns IP address] Address: [your dns IP address]#53 Name: test2.wildcardtest.com Address: 100.100.100.100 # nslookup test3.wildcardtest.com [your dns IP address] Server: [your dns IP address] Address: [your dns IP address]#53 Name: test3.wildcardtest.com Address: 100.100.100.100
As you can see, all hostnames which has
wildcardtest.com as its domain are resolved to
By default, dnsmasq forwards all requests which are not able to be resolved in
/etc/hosts to the default DNS server on the server dnsmasq is running. Therefore, you can see upstream DNS servers in
/etc/resolve.conf like below (or maybe you need to add configuration by yourself).
# cat /etc/resolv.conf # Generated by NetworkManager nameserver [upstream dns IP]