On hackerrank and Julia

My new day job has me developing considerably less code than my previous endeavor, so I like to work on problems to keep these particular muscles in steady use. Happily, I get to do more analytics than ever before, so this at least is some compensation for the lower amount of coding. When I work […]

That was fun: mysql update nuked remote access

Update your packages, they said. It will be more secure, they said. I guess it was. No network access to the databases. Even after turning the database server instance to listen again on the right port, I had to go in and redo the passwords and privileges. So yeah, this broke my MySQL instance for […]

Another fun bit of debugging

Ok … so here you are doing a code build. Your environment is all set. You have ample space. Lots of CPU, lots of RAM. All packages are up to date. You start your make. You have another window open with dstat running, just to kinda, sorta watch the system, while you are doing other […]

strace -p is your friend

So there I was, trying to use a serial port on a node which was connected to a serial port on a switch. Which I needed to properly configure the switch. So I light up minicom and get garbage. Great, a baud rate mismatch, easily fixed. Fix it. Connect again. I get the first 10-12 […]

Finding unpatched “features” in distro packages

I generally expect baseline distro packages to be “old” by some measure. Even for more forward thinking distros, they generally (mis)equate age with stability. I’ve heard the expression “bug for bug compatible” when dealing with newer code on older systems. Something about the devil you know vs the devil you don’t. Ok. In this case, […]

Systemd and non-desktop scenarios

So we’ve been using Debian 8 as the basis of our SIOS v2 system. Debian has a number of very strong features that make it a fantastic basis for developing a platform … for one, it doesn’t have significant negative baggage/technical debt associated with poor design decisions early on in the development of the system […]

You can’t win

Like that old joke about the patient going to the Doctor for a pain … Patient: Doctor, it hurts when I do this (does some action which hurts) Doctor: Don’t do it then Imagine if you will, a patient whom, after being told what is wrong, and why it hurts, and what to do about […]