DNS service configuration and application 3

DNS service configuration and application 3-Linux Enterprise Application-Linux server application information. The following is a detailed description. 16. Reverse parsing of the region file: The following is an example of the/var/named/chroot/var/named/192.168.16.arpa file.
$ Ttl 36000
16.168.192.in-addr. arpa. In soa dns.jackie.com. admin.jackie.com .(
2005090503 # Set SOA resource records
10800
3600
604800
36000)
16.168.192.in-addr. arpa. in ns dns.jackie.com. # Set NS resource records
177.16.168.192.in-addr. arpa. in ptr dns.jackie.com.
9 in ptr www.jackie.com. # Set pointer PTR resource records
178 in ptr mail1.jackie.com. # Set pointer PTR resource records
179 in ptr mail2.jackie.com. # Set pointer PTR resource records
180 in ptr mail3.jackie.com. # Set pointer PTR resource records
17. Load Balancing:
You only need to add A resource record to the dns region file, for example:
Ftp in a 192.168.1.1
Ftp in a 192.168.1.2
Ftp in a 192.168.1.3
18. achieve direct domain name resolution: Enter baidu.com and www.baidu.com to open the same web page function. Add A special A resource record, such
Jackie.com in a 192.168.16.9
Or
. In a 192.168.16.9
The two records are the same.
19. wildcard domain name resolution:
All Hosts And subdomain names under a domain name are resolved to the same IP address.
* .Jackie.com in a 192.168.16.9
Or
* In a 192.168.16.9
The two records are the same.
20. Master name server test
/Etc/rc. d/init. d/named start the named Process
Pstree | grep "named" check whether the named process is started
Vi/etc/resolv. conf
The content is as follows:
Domain jackie.com # Set the default domain name
Nameserver 192.168.16.177 # Set the dns server address
21. Test with nslookup Program
The nslookup program is the main test tool for dns services. The running mode is interactive and non-interactive.
Non-interactive nslookup [-Option] query domain name [dns server address]
Interactive nslookup [-dns server address]
22. The following uses the interactive mode as an example.
Run the nslookup command to enter> prompt
> Www.jackie.com
> 192.168.16.179

> Set type = cname
> Bbs.jackie.com

> Set type = mx
> Jackie.com

> Set type = soa
> Jackie.com

> Set type = NS
> Jackie.com

> Set type = a # test the Server Load balancer
> Ftp.jackie.com

> Set type = a # test direct domain name resolution
> Jackie.com

> Set type = a # test the wildcard Domain Name
> Ftp.jackie.com

> Www.tom.com # test the external domain name