At Cloudwatt, we have been operating a near hundred nodes Swift cluster in a unique datacenter for a few years. The decision to split the cluster on two datacenters has been taken recently. The goal is to have at least one replica of each object on each site in order …
When people talk about OpenStack Swift, we often hear the word Ring. This is because the Ring is a central piece in how Swift is working. But what is this thing everyone's talking about ?
The Ring refers to 3 files that are shared among every Swift nodes (storage and proxy …
This note summarizes articles from other places about Microsoft Windows images for OpenStack creation, along with some first hand experience. The whole process of creating Windows 2008 and Windows 2012 images fully usable on OpenStack instances is described there.
To achieve the creation of a qcow2 Windows image for …
OpenStack uses a role based access control (RBAC) mechanism to manage accesses to its resources. With the current architecture, users' roles granted on each project and domain are stored into Keystone, and can be updated through Keystone's API. However, policy enforcement (actually allowing or not the access to resources according …
The Openstack Identity v3 API, provided by Keystone, offers features that were lacking in the previous version. Among these features, it introduces the concept of domains, allowing isolation of projects and users. For instance, an administrator allowed to create projects and users in a given domain, may not have any …
A user at Cloudwatt had an issue about Cinder volumes with
status in-use, attached to VMs that didn't exist anymore. I could
find similar bugs referenced in launchpad here and there,
both with status invalid... But I didn't succeed in reproducing the
bug (using both the Horizon dashboard and the …
Ceph's documentation is quite extensive. However, when trying and installing Ceph on a running Openstack platform, I met two main issues: How to deal with a multi-backend setup? And how to deal with several nova-compute nodes? This note will focus on the steps that I followed in order to have …