To enable haproxy/keepalived failovers on a virtual machine, some kernel configuration tuning is needed. The settings on the VM host and client need to be adapted from a real physical server. The case I will describe below is built upon a simple bridged setup. At the time of install there where plenty of issues running…
Haproxy is a pretty nifty product. Probably not the least due to the fact that it’s author, Willy Tarreau spends hours of his life helping others in setting it up the way they want, sometimes fixing a bug in the process. The latest release marks the end to a 4-year long bugfix that finally went…
I recently had to migrate a redmine installation which gave me the opportunity to come in contact again with ruby, Plenty of my friends and co-devops seem to really love ruby. Now here was my chance to make this a slick one. At the same time I had to do some thinking concerning how to…
Check out the traffic flow state in Belgium where measured (15min window). I went ahead on the concept and built a real one, while building a mobile HTML5 application. You can see the page full size here. Click the house , bottom right to zoom to the max extent of the traffic layer. I’m trying…
When using Ubuntu 12.04 – Precise as your base for a XEN host you need to do a number of things to make it work. The reason I write this is in the first place for myself as a mental post-it. In the second place I want others to know about a few problems…
If you happen to have a xenconsoled process that looks like its eating memory, in fact the memory use of xenconsoled is increasing slowly in time. It turns out to be not so much a xenconsoled problem, but more a problem on a guest complaining it can’t write to it’s disk since it’s SR is…
Sensei, Voor alles wat ik van jou heb mogen leren, en zelfs nog steeds elke dag bijleer. Je was in staat dingen simpel voor te stellen maar ze bleven eens zo goed hangen. Zoals een echte budo-meester laat je eeuwig je stempel na op je kroost. Het was een eer voor mij. Domo arigato gozaimasu….
I think I will not be the only one that wanted to try out haproxy 1.5 release on an older Ubuntu release to enjoy the new goodies like enhanced SSL support. The easiest way to create your own packages is to download a version of the haproxy source code for building a new haproxy deb file….
In case you are getting this sort of error when setting up your box with iptable rules to support tproxy: root@cartman:~# iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT iptables: No chain/target/match by that name. That error is refering to the ‘-m socket’ match. It seems that on certain kernels (linode kernels…
If you found your way here Googling Github vs. Bitbucket instead of Bitbucket vs. Github, I forgive you. It was my natural instinct to type it up like that as well. Maybe I had some SEO tactics in my mind as well when I came up with this title. Anyway, if you came here to…