Open the MyDNS configuration file /etc/mydns.conf, fill in the correct database details, allow zone transfers by setting allow-axfr to yes, enable TCP (allow-tcp = yes), and specify a recursive resolver (i.e., a valid nameserver, e.g. from your ISP; e.g. recursive = 126.96.36.199) so that MyDNS can answer queries for domains that it isn't authoritative for:
## Wed Jan 18 17:18:48 2006
## For more information, see mydns.conf(5).
# DATABASE INFORMATION
db-host = localhost # SQL server hostname
db-user = mydns # SQL server username
db-password = mydnspassword # SQL server password
database = mydns # MyDNS database name
# GENERAL OPTIONS
user = nobody # Run with the permissions of this user
group = nobody # Run with the permissions of this group
listen = * # Listen on these addresses ('*' for all)
no-listen = # Do not listen on these addresses
# CACHE OPTIONS
zone-cache-size = 1024 # Maximum number of elements stored in the zone cache
zone-cache-expire = 60 # Number of seconds after which cached zones expires
reply-cache-size = 1024 # Maximum number of elements stored in the reply cache
reply-cache-expire = 30 # Number of seconds after which cached replies expire
log = LOG_DAEMON # Facility to use for program output (LOG_*/stdout/stderr)
pidfile = /var/run/mydns.pid # Path to PID file
timeout = 120 # Number of seconds after which queries time out
multicpu = 1 # Number of CPUs installed on your system
recursive = 188.8.131.52 # Location of recursive resolver
allow-axfr = yes # Should AXFR be enabled?
allow-tcp = yes # Should TCP be enabled?
allow-update = no # Should DNS UPDATE be enabled?
ignore-minimum = no # Ignore minimum TTL for zone?
soa-table = soa # Name of table containing SOA records
rr-table = rr # Name of table containing RR data
soa-where = # Extra WHERE clause for SOA queries
rr-where = # Extra WHERE clause for RR queries
Next, create the system startup links for MyDNS and start MyDNS:
chkconfig --levels 235 mydns on
The basic installation of MyDNS and MyDNSConfig is now finished. To log in to the MyDNSConfig interface, open a web browser and enter enter the following URL:
Replace <your_ip_address> with the IP address of your server.
The default username and password of MyDNSConfig are:
Don't forget to change the password after login under System > Users.
5 Using MyDNSConfig
In this chapter I will demonstrate how to use MyDNSConfig by creating an example zone test.com and an A record www.test.com.
First log in:
Click on the Add New Zone button:
The form on the SOA tab is preseeded with default values. Fill in test.com. (please note the final dot!) in the Origin field and make changes to the other fields, if necessary. The Zone Transfers field can be left empty which means that any server can connect to our MyDNS server to initiate a zone transfer; if you fill in an IP address, only that system can connect:
After you've clicked on Save, you will find your new zone listed on the Zones (SOA) page. Click on the test.com. link to go to the zone's properties:
Next, click on the Records tab:
Then click on the Add New Record button to create a record (A/MX/CNAME/...):
To create the A record www.test.com, fill in www in the Name field, select A as the Type, type in www.test.com's IP address in the Data field (e.g. 184.108.40.206), and specify the TTL (in seconds). The Preference/Priority field can be left empty for A records; it's needed for MX records:
After you've clicked on Save, you will find www.test.com in the list of records for the zone test.com:
That's it already - no restarts are required. You can now test if MyDNS can resolve www.test.com:
dig @localhost www.test.com
If all goes well, the output should look something like this:
[root@server1 ~]# dig @localhost www.test.com
; <<>> DiG 9.5.0a6 <<>> @localhost www.test.com
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55393
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;www.test.com. IN A
;; ANSWER SECTION:
www.test.com. 86400 IN A 220.127.116.11