" linux "

Proxmox/OpenVZ Can’t umount (unmount) device or resource busy

Recently when working on an OpenVZ container I was attempting to create a backup.  While doing so I kept running into a problem where the server wouldn’t let me unmount the container in order to create the backup.  The error you may see in this instance would say “Can’t umount /var/lib/vz/root/OpenVZID device or resource busy”, or “Can’t umount /var/lib/vz/root/100: Device or resource busy TASK ERROR: command ‘vzctl umount 100’ failed: exit code 51″, in this case the container being 100.  Here’s how I was able to fix it …  (more…)

How to sync or copy files between servers and/or workstations using RSYNC under CentOS Linux

Here’s a few quick tips on how to sync files between servers or workstations using rsync. (more…)

How to install and configure an FTP Server (vsFTP) on CentOS 6 in 5 minutes

In an earlier post I gave a quick tutorial on how to transfer files using LFTP instead of rsync or scp, and I had a few questions about setting up a simple and easy FTP server to use LFTP with. The easiest way i’ve found to do this is by using VSFTP, and here’s how to do it. (more…)

How to create a CD-ROM ISO image from hard drive, flash drive, or directory using Linux

Creating an ISO under linux is actually a LOT easier than you may think. You don’t need any extra software, and it can be done directly from the command line interface. To create an iso (more…)