Tag Archives: linux

Implementing an IP blocklist with firewalld

Posted on 2017/01/27 by Kirk Kosinski

In 2013 I wrote about using IP sets and iptables to block IP addresses from a blocklist 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 … Continue reading →

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Fixing a blank screen in KDE

Posted on 2015/05/18 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 … Continue reading →

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VMware VCP5-DCV recertification success

Posted on 2015/03/20 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 … Continue reading →

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SCALE 13x Linux-IO Presentation Video

Posted on 2015/02/26 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 … Continue reading →

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Dealing with a panel lotto with a ThinkPad

Posted on 2015/02/14 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 … Continue reading →

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Mass blocking of evil IP addresses with iptables and IP sets

Posted on 2013/11/22 by Kirk Kosinski

When running a Linux server or firewall it may be useful to use iptables to block a list of known “evil” IP addresses.  There are many organizations maintaining “block lists” of such IPs, such as Spamhaus, DShield, and OpenBL.  Blocking … Continue reading →

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