DNS CONFIGURATION IN AIX
Most of the times people ask me how to create DNS in AIX, so here I give you step by step procedure to make AIX machine as DNS server.
1. Change your hostname to a fully qualified host name.
» root@lpar1: hostname lpar1.my.example.com
2. Create a directory /var/named to hold your zone files.
» root@lpar1: mkdir /var/named __
3. Create the /etc/named.conf file. The file should list your forward and reverse domains. It should also contain a reverse domain for loopback. All domain files should be stored in the /var/named directory.
» root@lpar1: vi /etc/named.conf
The file should look like this:
options
{ directory “/var/named”; };
zone “my.example.com”
{ type master;
file “named.my.example.com”; };
zone “1.168.192.in-addr.arpa”
{ type master;
file “named.192.168.1”; };
zone “0.0.127.in-addr.arpa”
{ type master;
file “named.local”; };
zone "." { type hint; f
file "named.ca"; }; __
4. Create the name zone file so that it properly reflects your domain.
» root@lpar1: vi /var/named/named.my.example.com
The file should eventually look like this:
@ 9999999 IN SOA lpar1.my.example.com. root.lpar1.my.example.com. ( 2009010901 ; Serial
3600 ; Refresh
300 ; Retry
360000 ; Expire
86400 ) ; Minimum
9999999 IN NS lpar1
loopback 9999999 IN A 127.0.0.1
localhost 9999999 IN CNAME loopback lpar1
9999999 IN A 192.168.1.1
lpar2 9999999 IN A 192.168.1.2
lpar3 9999999 IN A 192.168.1.3
5. Create the IP zone file(s) so that they properly reflect your domain.
» root@lpar1: vi /var/named/named.192.168.1.1
The file should eventually look like this:
@ 9999999 IN SOA lpar1.my.example.com. root.lpar1.my.example.com. ( 2009010901 ; Serial
3600 ; Refresh
300 ; Retry
360000 ; Expire
86400 ) ; Minimum
9999999 IN NS lpar1.my.example.com.
1 9999999 IN PTR lpar1.my.example.com.
2 9999999 IN PTR lpar2.my.example.com.
3 9999999 IN PTR lpar3.my.example.com.
6. Create the local IP zone file.
» root@lpar1: vi /var/named/named.local The file should eventually look like this:
@ 9999999 IN SOA lpar1.my.example.com. root.lpar1.my.example.com. (
2009010901 ; Serial
3600 ; Refresh
300 ; Retry
360000 ; Expire
86400 ) ; Minimum
9999999 IN NS lpar1.my.example.com.
1 9999999 IN PTR loopback.
7. Create the cache file so that it contains the name server of an upstream domain, or one of the root name servers.
» root@lpar1: vi /var/named/named.ca The file should look like this:
. 9999999 IN NS ns.example.com. ns.example.com.
9999999 IN A 192.168.0.1
8. Start the named daemon and verify that it started correctly.
» root@lpar1: startsrc -s named
» root@lpar1: lssrc -s named
9. Execute a few queries with dig to make sure that the name server is fully operational.
» root@lpar1: dig @localhost lpar1.my.example.com a
» root@lpar1: dig @localhost 1.1.168.192.in-addr.arpa ptr
» root@lpar1: dig @localhost 1.0.0.127.in-addr.arpa ptr
In all cases you should get a proper response in the “ANSWER SECTION”. Ignore the output in the “AUTHORITY SECTION”: this is mostly for use by name servers between each other. __
10. .If all dig queries are correct, then make this system a client of itself by modifying the /etc/resolv.conf file to point to itself.
» root@lpar1: vi /etc/resolv.conf The file should look like this:
domain my.example.com
nameserver 192.168.1.1
nameserver 192.168.1.2
Add the nameserver info in all clients.
Enjoy resolving names to ips.