Bloomberg runs several independent HA clusters based on the chef-bcpc archetecture.
Upgrading a live HA openstack cluster requires careful planning and guts of steal. We will talk about the experiences of upgrading Bloomberg s HA BCPC Openstack clusters. We will discuss the work flows we designed and tools we use for for upgrading the clusters and keeping them up to date. We also discus some of the things exciting things that can go wrong and share some of our scare tissue.