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Setting a “smarthost” in Postfix September 7, 2005

Posted by Carthik in administration, ubuntu.

Since Postfix is the default Mailer used in Ubuntu, and since you may need to set a smarthost to possibly send outgoing mail through the SMTP server on a webserver, or your ISP, here’s how to do that:

Edit /etc/postfix/main.cf, and add or edit this line:
relayhost = your.server.com

Followed by restarting the postfix service:

$sudo /etc/init.d/postfix restart

This might be handy particularly for those who use a combination of Mutt + procmail + fetchmail to read their mail – old style. 


Adding a startup script to be run at bootup September 7, 2005

Posted by Carthik in ubuntu.

So you have a script of your own that you want to run at bootup, each time you boot up. This will tell you how to do that.

Write a script. put it in the /etc/init.d/ directory.
Lets say you called it FOO. You then run

% update-rc.d FOO defaults

You also have to make the file you created, FOO, executable, using
$chmod +x FOO

You can check out
% man update-rc.d for more information. It is a Debian utility to install scripts. The option “defaults” puts a link to start FOO in run levels 2, 3, 4 and 5. (and puts a link to stop FOO into 0, 1 and 6.)

Also, to know which runlevel you are in, use the runlevel command.