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Unmount a drive when it is busy

There are some circumstances where you have to unmount a drive, but it is not letting you. Giving an error, similar to this:

umount: /mnt/backup: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

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Reserve IP in OpenVPN

openvpn-logo-300x300The IPs in the VPN are assigned randomly. If you have your router configured using something like Tomato, you can setup the reservation by MAC address. For the linux-based install, follow these steps:

1) To begin, first identify the directory, where the files will be stored:

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CentOS 7 Linux - missing ifconfig

centosThe widely used ifconfig is missing from Centos 7.X version of Linux with minimal install. To get it back, run the following command:

yum install net-tools

The command will then be available as usual.

If you don't want to use ifconfig and are wondering how else you can find the IP address, you can run this command:

ip link

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Enable subject logging in Postfix

postfix1Q. We would like to enable subject logging in Postfix, how do we go about doing that?

A. First, you need to install postfix-pcre package (Perl Compatible Regular Expressions support for postfix). We were doing it on Ubuntu 12, so:

apt-get install postfix-pcre

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