Posted on So 20 November 2005

Introducing nss-myhostname

I am doing a lot of embedded Linux work lately. The machines we use configure their hostname depending on some external configuration options. They boot from a CF card, which is mostly mounted read-only. Since the hostname changes often but we wanted to use sudo we had a problem: sudo requires the local host name to be resolvable using gethostbyname(). On Debian this is usually done by patching /etc/hosts correctly. Unfortunately that file resides on a read-only partition. Instead of hacking some ugly symlink based solution I decided to fix it the right way and wrote a tiny NSS module which does nothing more than mapping the hostname to the IP address (and back). (That IP address is on the loopback device, but is not identical to localhost.)

Get nss-myhostname while it is hot!

BTW: This tool I wrote is pretty useful on embedded machines too, and certainly easier to use than setterm -dump 1 -file /dev/stdout | fold -w 80. And it does color too. And looping. And is much cooler anyway.

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