That was fun … no wait … the other thing … not fun

Long overdue update of the server this blog runs on. It is no longer running a Ubuntu flavor, but instead running SIOSv2 which is the same appliance operating system that powers our products. This isn’t specifically a case of eating our own dog-food, but more a case that Ubuntu, even the LTS versions, have a […]

new SIOS feature: compressed ram image for OS

Most people use squashfs which creates a read-only (immutable) boot environment. Nothing wrong with this, but this forces you to have an overlay file system if you want to write. Which complicates things … not to mention when you overwrite too much, and run out of available inodes on the overlayfs. Then your file system […]

A wonderful read on metrics, profiling, benchmarking

Brendan Gregg’s writings are always interesting and informative. I just saw a link on hacker news to a presentation he gave on “Broken Performance Tools“. It is wonderful, and succinctly explains many thing I’ve talked about here and elsewhere, but it goes far beyond what I’ve grumbled over. One of my favorite points in there […]

Updated net-tools bits

So far, 3 components, and working to fix a few things in formatting. On github, grab it here. First, lsbond.pl to report about bond details root@unison-mgr-1:~/net-tools# ./lsbond.pl bond0: mac 0c:c4:7a:48:69:cb state up mode fault-tolerance (active-backup) xmit_hash layer2 0 active slave eth1 polling 100 ms up_delay 200 ms down_delay 200 ms slave nics: eth1: mac 0c:c4:7a:48:69:cb, […]

SIOS v2.0 running pxe booted

Our SIOS (Linux based OS, usually based upon Debian) has just been updated for jessie (Debian 8). This was necessary to support rkt, docker, etc. in addition to our other bits. Its been cooking in the background for a while, for, as you might have noticed from my posting frequency, I’ve been busy. But we […]

stateless booting

A problem I’ve been working on dealing with for a while has been the sad … well … no … terrible state of programmatically configured Linux systems, where the state is determined from a central (set of) source(s) via configuration databases, and NOT by local stateful configuration files. Madness lies in wait for those choosing […]

Systemd, and the future of Linux init processing

An interesting thing happened over the last few months and years. Systemd, a replacement init process for Linux, gained more adherents, and supplanted the older style init.d/rc scripting in use by many distributions. Ubuntu famously abandoned init.d style processing in favor of upstart and others in the past, and has been rolling over to systemd. […]

Mixing programming languages for fun and profit

I’ve been looking for a simple HTML5-ish way to represent our disk drives in our Unison units. I’ve been looking for some simple drawing libraries in javascript to make this higher level, so I don’t have to handle all the low level HTML5 bits. I played with Raphael and a few others (including paper.js). I […]