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Upgrading Percona Server 5.5 to 5.6 on CentOS
I like using Percona Server for some projects because you get to see what their clients feel is important for operating MySQL at scale, as reflected in the features that Percona adds. Some examples are...
View ArticleDeveloping Twitter Apps with Perl
Most of the Twitter-related blogs and sample code on the web are obsolete, so I wrote this overview for 2015. The most important things to know are: Twitter API 1.1 is required using OAuth and SSL your...
View ArticleHow to Make mod_rewrite Do What You Mean
A Yahoo! engineer once said to me, “The most important feature of Apache httpd is mod_rewrite. It allows large sites like ours that have frequent content structure changes to be controlled with...
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Why Can’t ISPs Handle SPF Records?
I’m always appalled when I need to setup a Sender Policy Framework (SPF) record using ISP zone file editors. It took ThePlanet (now owned by IBM/SoftLayer) 5 years to fix their web interface to handle...
View ArticleIFR Magazine: Danger Below MDA?
AvWeb has a chilling reprint from IFR Magazine on US airlines intentionally descending below the approach plate MDA … “Flight inspection noted that a GPWS alert was received at the reported location if...
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SVLUG: Daniel Klopp on Docker
At Silicon Valley Users Group (SVLUG) tonite, Daniel Klopp, Senior Technical Consultant, Taos Consulting, gave an intermediate talk on “Docker.” He had some really informative and detailed slides on...
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Drones and ADS-B
AvWeb has a very interesting article on possible Google involvement with drones and ADS-B. For those new to ADS-B, at a high level it is digital beacon that must be installed on all airliners...
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O’Reilly: Managing Mission-Critical Domains and DNS
It’s been a while since I looked forward to a book, but this one by Mark Jeftovic of easydns.com looks pretty interesting: What’s amusing is that Amazon lists it as #1 in “Hot New Releases in Unix DNS...
View ArticleGNU Parted Alignment Check Option
GNU Parted 2.1 (available in Redhat 6+) has a very interesting option for storage engineers, sysadmins and DBAs: 2.4.1 align-check Command: align-check align-type n Determine whether the starting...
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Lessons from “Gear-Up Mishap Was Botched Go-Around”
Hitting the runway on a go-around is not the greatest airmanship, but the Aerostar pilot did one thing right: he didn’t panic and continued flying the airplane. Aerostar with curled props after ground...
View ArticlePercona Clustercheck Improved Error Handling Patch
Here’s my Github pull request for improved error handling in Percona’s clustercheck utility, used by haproxy for health-checking a Percona XtraDB Cluster. It adds two features: 401 Unauthorized...
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New Horizons Flyby of Pluto
When I was in school, Pluto was just a name of a far-away planet. We knew it’s orbit, mass and estimated diameter, but those were all indirectly calculated. The only images we had of Pluto looked like...
View ArticlePoor Man’s Profiling with the Linux ts Command
Sometimes when you’re investigating server performance issues, you don’t have the luxury of a full development suite installed with tools like a profiler. It turns out that the linux ts command,...
View ArticleNotes on Upgrading from CentOS 5 to CentOS 7
If CentOS 5 or 6 still work fine for you and you’re happy with the security updates you’re getting, then there’s no pressing need to upgrade. I had motivation (to use the Cairo graphics libraries) to...
View ArticleNotes on Virtualbox 4.3.30 and OS X 10.8.5 for CentOS 7
Virtualbox 4.3.30 on OS X 10.8.5 with CentOS 7 guest VMs work ok on my notebook for web development, but setup was a little fussy. I use VMs for: general web development and testing, to stay off the...
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HOWTO: CentOS 7/Redhat 7 Firewalld Setup for Cassandra Server
How to do initial firewalld configuration for Cassandra Server and Opscenter on CentOS/Redhat 7 with 2 network interfaces, in my case Dell 1950/2950. First: verify that your network interfaces are...
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Congratulations on HondaJet USA Certification
Congrats to Honda for earning FAA Production Certification for their first aircraft, the HondaJet HA-420 light business jet. I’ve been following the news of the HondaJet for over a decade as they...
View ArticleBabbage’s Difference Engine at Computer History Museum
Today was the last chance to see Babbage’s Difference Engine at the CHM in Mountain View before the owner makes it private again. The Computer History Museum has certainly matured into a world-class...
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Congrats to LIGO Team
Congrats to the Laser Interferometer Gravitational-wave Observatory (LIGO) team for directly detecting gravitational waves for the first time. LIGO was the NSF’s most expensive project, and took...
View ArticleMH370 Debris Illuminates Crash Reasons
A few pieces of MH370 have recently been found on a Mozambique beach. Their excellent condition and size indicate that it wasn’t a steep descent into an obstacle or water. That leaves: explosion or...
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