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Re: /etc/hosts hostname alias

On Thu, Dec 30, 2004 at 07:59:57PM +0100, Frank Lenaerts wrote:
> Hi,
> Can someone tell me why the hostname of a machine is added as an alias
> for to /etc/hosts during the installation i.e. why do we
> have something like this in /etc/hosts?
> --- begin ---
>       localhost.localdomain   localhost       pluto
> ---  end  ---
> With the default (and normal) /etc/nsswitch.conf, first /etc/hosts is
> consulted and then DNS.
> Having the hostname as alias for the localhost IP address already got
> me in troubles two times:
> (1) When adding a new host to a Kerberos realm. It took me quite some
>     time to find out why I could not login to a newly added machine
>     (using the same procedure as on my Woody boxes). Part of the
>     problem was the fact that /etc/hosts contained the hostname (not
>     fully qualified) as alias for
> (2) When creating a sudoers file with Host_Alias definition. Using the
>     (short) hostname makes that sudo keeps asking for a password while
>     it should not. Using the IP address or deleting the hostname alias
>     in /etc/hosts resolves this issue.
> BTW, note that the output of hostname --fqdn shows
> localhost.localdomain. Deleting the alias shows the correct fully
> qualified hostname.
> Thus, why is the hostname added as an alias for 
> P.S.: All Sarge machines are installed using the network (PXE) so they
> get their IP via DHCP. After installation however, I statically assign
> their IP (BIOS first tries to boot from the network (only used to
> install), then from the harddisk).

Here you provide the answer.

"DHCP installed computers" get hostname as alias for localhost.

You also mentioned the workaround:
assign static IP address during installation.

> cu,

Geert Stappers

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