Tag Archives: geek

Restoring LVM volumes

Posted on 2013-11-23 by Jethro Carr

LVM is a fantastic technology that allows block devices on Linux to be sliced into volumes(partitions) and allows for easy resizing and changing of the volumes whilst running, in a much easier fashion than traditional MSDOS or GPT partition tables. … Continue reading →

Tagged , , , , | 8 Comments

Resize ext4 on RHEL/CentOS/EL

Posted on 2013-11-23 by Jethro Carr

I use an ext4 filesystem for a couple large volumes on my virtual machines. I know that btrfs and ZFS are the new cool kids in town for filesystems, but when I’m already running RAID and LVM on the VM … Continue reading →

Tagged , , , , , , , , , , , , | 1 Comment

I’m Jethro Carr, open source geek, and this is how I work

Posted on 2013-11-19 by Jethro Carr

Lifehacker regularly features a segment where they interview famous people and ask them how they work. Rather than waiting for the e-mail that would never come has yet to come, my friend Jack Scott decided to answer this set of … Continue reading →

Tagged | Leave a comment

Enterprise or Consumer Spinning Rust Platters?

Posted on 2013-11-17 by Jethro Carr

I recently wrote about bad hard disks being responsible for impacting array performance negatively after having some consumer grade disks fail in a fashion that impacted performance, but didn’t result in the disk being marked as bad. Since then I’ve … Continue reading →

Tagged , , , , , , , | 1 Comment

“OpsDev”

Posted on 2013-11-14 by Jethro Carr

I recently did a talk at one of the regular Fairfax “Brown Bag” lunches about tools used by the operations team and how developers can use these tools to debug some of their systems and issues. It won’t be anything … Continue reading →

Tagged , , , , , , , | Leave a comment

In Welly for Kiwicon

Posted on 2013-11-05 by Jethro Carr

I’ll be in Wellington for Kiwicon from Fri 8th to Tue 12th. If you’re coming to the conference, track me down and we’ll catch up there. If you’re not at the conference, I’ll be around town, so just drop me … Continue reading →

Tagged , , , , , , | 6 Comments

Exposing name servers with Puppet Facts

Posted on 2013-11-05 by Jethro Carr

Carrying on from the last post, I needed a good reliable way to point my Nginx configuration at a DNS server to use for resolving backends. The issue is that I wanted my Puppet module to be portable across various … Continue reading →

Tagged , , , , , , , , | 6 Comments

Varnish DoS vulnerability

Posted on 2013-11-02 by Jethro Carr

The Varnish developers have recently announced a DoS vulnerability in Varnish (CVE-2013-4484) , if you’re using Varnish in your environment make sure you adjust your configurations to fix the vulnerability if you haven’t already. In a test of our environment, … Continue reading →

Tagged , , , , , , | Leave a comment

SPF with SpamAssassin

Posted on 2013-10-26 by Jethro Carr

I’ve been using SpamAssassin for years, it’s a fantastic open source anti-spam tool and plugs easily into *nix operating system mail transport agents such as Sendmail and Postfix. To stop sender address forgery, where spammers email using my domain to … Continue reading →

Tagged , , , , , , , , | 4 Comments

Puppet CRL Time Errors

Posted on 2013-10-20 by Jethro Carr

Puppet is much loved for it’s clear meaningful messages when something goes wrong, made even more delightful when you combine it with the lovely error messages thrown out by OpenSSL. Warning: SSL_connect returned=1 errno=0 state=SSLv3 read server certificate B: certificate … Continue reading →

Tagged , , , , | 1 Comment