Bala-Krishna

CNAME stands for Canonical Name for a domain. CNAME is an alias records that create association between a sub-domain and antother domain or subdomain.

And, A Record simply creates an association between a domain/sub-domain name and an IP Address.

Example CNAME
gallery.bala-krishna.com -> gallery.another-domain.com -> 64.1.236.65

you can see above CNAME require two DNS lookup to translate domain/subdomain to an IP Address. If client request for gallery.bala-krishna.com then DNS record will return gallery.another-domain.com then gallery.another-domain.com has to query DNS to translate gallery.another-domain.com into IP Address.

CNAME Record Syntax:
www  14400  IN  CNAME  bala-krishna.com

Example A Record

gallery.another-domain.com -> 64.1.236.65

In case of gallery.another-domain.com, A record directly point to an IP Address so the DNS lookup directly returns IP Address to the client rather then domain/subdomain. hence only one DNS lookup required.

A Record Syntex:
ftp    14400  IN   A   67.159.45.3

WHM is a Web Host Manager tool that allows server administrators to quickly and easily add new web hosting accounts on a WHM enabled Web server. Here is steps to create new hosting account without hassle.

1. Log into WHM account with your username and password.
2. Click the Create a New Account link from the Account Functions menu.
3. Enter the domain name into the Domain field, and the username into the UserName field. The UserName field will initially default to a name based on the domain you enter, but you may change it if you wish.
4. Enter a password into the Password field, and the disk quota into the Quota field. The Quota field, measured in MegaBytes, controls how much hard-disk space the new account is allotted.
5. Decide whether to allow CGI access, Shell access and FrontPage extensions, then check the respective boxes accordingly.
6. Decide on limits for the following boxes and enter values for each in the text field for each: Max FTP Accounts, Max Email Accounts, Max Email Lists, Max SQL Databases and Max Sub Domains.
7. Enter the maximum bandwidth for the account (in MegaBytes) into the Bandwidth Limit field.
8. Click on “Create” button.

Cron is a Linux command tool that allows you to schedule tasks unattended at a specified time interval. There are several ways to schedule commands to run. You can run any available command or script like php, perl and shell script as a Cron Job. It run specified command and send output to the user or email id specified in the configuration.

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