DISCLAIMER: I’m still getting my feet wet with Open vSwitch. This post is just a cleaned up version of my scratchpad. Open vSwitch has a few ways of providing rate limiting – this deep dive will go into the internals of reverse engineering an existing virtual interface’s egress rate limits applied with tc-htb. Hierarchy Token Bucket […]
Ever have an exchange like this? Q: What happened <insert very very long time ago> on this service? A: We can’t keep logs on the server past 2 months. Those logs are gone. Just about every IaaS out there has an object store. Amazon offers S3 and OpenStack providers have Swift. Why not just point […]
Hardware: Dell XPS 8500 Intel i5 RAM + SSD upgrades from Crucial Local Storage (1T) Software: Fedora Core 18 (base OS) VirtualBox Vagrant DevStack XenServer 6 I’m setting up a home lab to do some light coding on OpenStack and for testing implementations of next generation software/hardware deployment tools like BOSH and Razor.
grep is a wonderful tool for digging through logs on specific issues, but there are a few cases when people misuse it and claim the logs don’t have the answers when grep didn’t yield an answer. Here’s an example of Rails application logging from Ruby on Rails Guides: Processing PostsController#create (for 127.0.0.1 at 2008-09-08 11:52:54) […]
Digging through code for common terms can yield lots of results. ack provides a way to send the output to less. Just add the following to ~/.ackrc.
Based on currently available code (nova: a77c0c50166aac04f0707af25946557fbd43ad44 2012-11-02/python-glanceclient: 16aafa728e4b8309b16bcc120b10bc20372883f4 2012-11-07/glance: 9dae32d60fc285d03fdb5586e3368d229485fdb4) This is a deep dive into what happens (and where in the code) during image creation with a Nova/Glance configuration that is backed by XenServer/XenAPI. Hopefully the methods used in Glance/Nova’s code will not change over time, and this guide will remain good starting point. Disclaimer: I am […]
Based on currently available code (a77c0c50166aac04f0707af25946557fbd43ad44 2012-11-02) This is a deep dive into what happens (and where in the code) during a rescue/unrescue scenario with a Nova configuration that is backed by XenServer/XenAPI. Hopefully the methods used in Nova’s code will not change over time, and this guide will remain good starting point. Rescue 1) […]