correct /etc/hosts format

linuxfia · 11-21-2008, 01:17 PM

For /etc/hosts, which is the correct format?

Code:

127.0.0.1        localhost.localdomain  localhost
10.10.10.10	core.domain.com core

Or

Code:

127.0.0.1       core.domain.com core localhost.localdomain localhost
10.10.10.10	core.domain.com core

On various sources, some say the server's actual fqdn must follow the 127.0.0.1 and then localhost.localdomain and localhost and some say the line with 127.0.0.1 should only contain localhost.localdomain and localhost.
Or does it vary depending on the distro? I'm running Redhat and Ubuntu distros.

Thanks

mazhar_theone · 11-21-2008, 01:24 PM

Quote:

Originally Posted by linuxfia

For /etc/hosts, which is the correct format?

Code:

127.0.0.1        localhost.localdomain  localhost
10.10.10.10	core.domain.com core

Or

Code:

127.0.0.1       core.domain.com core localhost.localdomain localhost
10.10.10.10	core.domain.com core

On various sources, some say the server's actual fqdn must follow the 127.0.0.1 and then localhost.localdomain and localhost and some say the line with 127.0.0.1 should only contain localhost.localdomain and localhost.
Or does it vary depending on the distro? I'm running Redhat and Ubuntu distros.

Thanks

The first one is correct format for /etc/hosts

linuxfia · 11-25-2008, 12:09 PM

Thanks, but do you know why the distros such as Redhat would add the hostname automatically after the 127.0.0.1?
127.0.0.1 core.domain.com core localhost.localdomain localhost

ugge · 11-27-2008, 11:34 AM

the 127.0.0.1 address is only a virtual interface, called loop back, and is only accessible for the machine it self.
A domain name is a representation for an IP, so it should be associated with the corresponding IP only.