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Implementing an IP blacklist with firewalld

2017 January 27
by Kirk Kosinski

In 2013 I wrote about using IP sets and iptables to block IP addresses from a blacklist provided by organizations such as OpenBL.  The Bash script I wrote for that was usable at the time, but in the intervening years many Linux distributions (including CentOS and RHEL 7) enabled firewalld by default, so I needed to update the script.

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Fixing High CPU Usage for Windows Update

2016 May 21
by Kirk Kosinski

Recently I had an issue with Windows Update on a newly deployed Windows 7 VM.  I’ve been using the same template to deploy Windows 7 VMs for a couple years, so it was strange that suddenly there was a problem.  After a bit of troubleshooting, however, I successfully found a solution.

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Fixing a blank screen in KDE

2015 May 18
by Kirk Kosinski

I have Fedora 21 installed on my laptop (a ThinkPad) and use the KDE window manager.  Recently (today, actually) I ran into a bizarre problem with it: after undocking it, the screen went blank.  Or technically, it stayed blank instead of turning on, since when it is docked I only use external monitors (two hooked up via the DisplayPort outputs on the dock, and one connected to the DisplayPort output on the laptop itself).  It took some troubleshooting but eventually I solved it.

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VMware VCP5-DCV recertification success

2015 March 20
by Kirk Kosinski

So the other day I took and passed the VMware VCP5-DCV Delta exam (VCP550D) to renew my VCP5-DCV cert.  Originally I had no plan to blog about this since I took the exam on the very last day it was supposed to be available (and the same day of my cert expiration).  However, a day before the deadline VMware extended it another two months to May 8!  So since this exam is still available I’ll share my impressions and a few tips.

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SCALE 13x Linux-IO Presentation Video

2015 February 26
by Kirk Kosinski

I recently attended the SCALE 13x conference in Los Angeles.  It was my fourth time attending SCALE and as usual I found it to be an excellent event.  Unlike some previous years I didn’t work in the expo hall (no CloudStack booth this year) so I had more time to watch presentations, and there were some great ones.  Additionally, this year I submitted a presentation, Getting to know Linux-IO, which was accepted by the organizers!

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Dealing with a panel lotto with a ThinkPad

2015 February 14
by Kirk Kosinski

Every laptop I’ve owned in the 21st century has been a ThinkPad.  Factors important to me include build quality, reliability, warranty support, and the keyboard, and all of these are typically excellent on ThinkPads.  Moreover, major components are typically made by reputable manufacturers, which helps with the reliability and (important to me) Linux compatibility.  Just as an example, the NIC on every ThinkPad I’ve owned has been from Intel, so there is no hassle at all getting it to work with Linux.  Lately, however, there have been some changes for the worse.

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