Category Archives: Linux

Reclaim storage space from qcow2 image after moving

Posted on July 23, 2017 by Ahmed Tawfik

After it is moved to another host, since it is a sparse file, the qcow2 takes the full space, e.g. if it was dynamically set to 100GB, it will take 100GB, even if only 50 GB were actually used. I … Continue reading →

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Securely delete files/folders in Ubuntu

Posted on July 19, 2017 by Ahmed Tawfik

In brief, you should NEVER trust your HDD before handing it over to someone else! The solution to this would be either wipe the whole HDD or at least wipe the files/folders that you need to keep out of reach. … Continue reading →

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Add an additional physical volume to your encrypted LVM volume group

Posted on July 18, 2017 by Ahmed Tawfik

With a default Linux Mint installation, do the following after connecting the new hard disk to your computer, we will assume the new HDD is /dev/sda: sudo pvcreate /dev/sda sudo vgextend mint-vg /dev/sda sudo lvextend -l +100%FREE /dev/mint-vg/root sudo cryptsetup … Continue reading →

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Connect to your Skype for Business Office 365 Account using Pidgin

Posted on July 4, 2017 by Ahmed Tawfik

Add the following PPA: https://launchpad.net/~sipe-collab/+archive/ubuntu/ppa (not needed for Ubuntu 18.04) Install/Update pidgin and pidgin-sipe packages Create a new account with type “Office Communicator” User name should be user@domain.org Leave the “login” empty In the Advanced Tab, under server, enter sipdir.online.lync.com:443 Connection Type and … Continue reading →

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How to convert your SSL certificates to be used by Tomcat instead of Apache

Posted on May 24, 2017 by Ahmed Tawfik

I have a wildcard certificate that needs to be used on multiple websites that my employer owns. To be able to use that SSL certificate on Tomcat, it has to be used in a totally different format, that’s Java-specific. That … Continue reading →

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