Is it possible to add a wildcard CNAME into dnsmasq?
I would like to let the DNS works in round robin way. So I have to put an entry into /etc/hosts
. However, this does not allow wildcard domains.
Is there any way that I can do this in dnsmasq?
So I will get something like:
*.test.example. 0 IN CNAME mytest.example.
mytest.example. 0 IN A 192.0.2.123
Solution 1:
I've checked v2.77 and found that wildcard CNAME is working there. You should add to config cname=*.example.com,default.example.com
, but your dnsmasq should be authoritative server for domain(in this case for example.com). It could be configured according man. In my case, I have such configuration:
/etc/hosts
127.0.0.1 default.example.com 127.0.0.2 default.example.com 127.0.0.3 default.example.com 127.0.0.4 default.example.com 127.0.0.5 default.example.com
/etc/dnsmasq.conf
cname=*.example.com,default.example.com auth-server=example.com,eth0 interface-name=example.com,eth0 auth-zone=example.com,127.0.0.0/24,eth0
And result:
[root@centos-linux ~]# dig @127.0.0.1 *.example.com
; <<>> DiG 9.9.4-RedHat-9.9.4-29.el7_2.3 <<>> @127.0.0.1 *.example.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6531
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 6, AUTHORITY: 0, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;*.example.com. IN A
;; ANSWER SECTION:
*.example.com. 600 IN CNAME default.example.com.
default.example.com. 600 IN A 127.0.0.3
default.example.com. 600 IN A 127.0.0.4
default.example.com. 600 IN A 127.0.0.5
default.example.com. 600 IN A 127.0.0.2
default.example.com. 600 IN A 127.0.0.1
;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Mon Jun 05 16:28:13 MSK 2017
;; MSG SIZE rcvd: 155
[root@centos-linux ~]# nslookup 2.example.com 127.0.0.1
Server: 127.0.0.1
Address: 127.0.0.1#53
Non-authoritative answer:
2.example.com canonical name = default.example.com.
Name: default.example.com
Address: 127.0.0.5
Name: default.example.com
Address: 127.0.0.2
Name: default.example.com
Address: 127.0.0.3
Name: default.example.com
Address: 127.0.0.4
Name: default.example.com
Address: 127.0.0.1