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Redirect root mail to an external e-mail address

July 29, 2008

This uses postfix, my mail transport of choice.
Configure /etc/postfix/main.cf as below. (If you already have a local MTA running, skip this section.) Also, this allows any other mail to be sent from your box, not just for root.

myhostname = host.domain.tld
mydomain = domain.tld
myorigin = $myhostname
inet_interfaces = localhost
mydestination = $myhostname, localhost.$mydomain, localhost
mynetworks = 127.0.0.0/8
relayhost = [your.mail.server.ipaddress]
Add [...]

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CentOS custom network scripts on ifup and ifdown

July 29, 2008

To automatically run custom scripts as interfaces are brought up and down, create the following files:
/sbin/ifup-local
/sbin/ifdown-local
and mark them executable:
chmod +x /sbin/ifup-local
chmod +x /sbin/ifdown-local
These will be called everytime an interface comes up or goes down. The device name will be passed to it as an argument so you can use it in the script. For example, [...]

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