A Blog of the ZHAW Zurich University of Applied Sciences
NOTE TO THE READER – 16 Jun 2014: after this post was published, some very insightful comments have been issued that made me consider the necessity of adding this note to warn the readers and remark what has been compared in this study. Ceph and Swift have been deployed and compared as object storage systems and […]
When setting up a cluster with ceph-deploy, just after the ceph-deploy osd activate phase and the distribution of keys, the OSDs should be both “up” and “in” the cluster. One thing that is not mentioned in the quick-install documentation with ceph-deploy or the OSDs monitoring or troubleshooting page (or at least I didn’t find it), is that, upon (re-)boot, mounting […]
The First International Workshop on Cloud Automation, Intelligent Management and Scalability (CAIMS 2014) is to be co-located with the 7th IEEE/ACM International Conference on Utility and Cloud Computing (UCC 2014) held in London, UK, December 8th – 11th 2014. Objectives: The emergence of infrastructure as a service (IaaS) cloud computing environments which allow the dynamic […]
Update: This does not apply to Icehouse. This flag was to activate an experimental feature -this option no longer exists in Icehouse. (It is in Havana, however). There have been some criticisms of the implementation of Ceilometer (or Telemetry as of Icehouse) – however, it’s still the main show in town for understanding what’s going […]
The participation to the announced Swiss Informatics SIG CC kick-off meeting, hosted by ZHAW ICCLAB on 21-May-2014 in Winterthur, was good (industrial, SME, academic and associations) and the assembly confirmed that overall objectives of this Group are the understanding of cloud computing technologies and related supporting actions for Swiss industry, research and education. To achieve […]
We were doing some work with Ceilometer – it appears in a few of our activities – and I was trying to get up to speed with it. Playing with the python Ceilometer client proved a little more difficult then envisaged – mostly due to deficiencies in documentation. Here’s a small note on an issue […]
As system administrators it is difficult to gather performance data before going productive. Benchmarking tools offer a comfortable way to gather performance data by simulating usage of a productive system. In the OpenStack world we can employ the Mirantis Rally tool to benchmark VM performance of our cloud environment. Rally comes with some predefined benchmarking […]
In many applications it is necessary to create virtual resources in a certain order. As an orchestration engine, Heat is able to support such a requirement, but how it is actually done in a template can be tricky. Recently I had to write such a Heat template, which seemed pretty easy as there is a number […]
(Part 1/3 – Installation – Part 2/3 – troubleshooting) This part of the tutorial describes how to setup a simple Ceph client using librados (for C++). The only information that the client requires for the cephx authentication is Endpoint of the monitor node Keyring containing the pre-shared secret (we will use the admin keyring) Install librados APIs On Ubuntu, […]
(Part 1/3 – Installation – Part 3/3 – librados client) It is quite common that after the initial installation, the Ceph cluster reports health warnings. Before using the cluster for storage (e.g., allow clients to access it), a HEALTH_OK state should be reached: cluster-admin@ceph-mon0:~/ceph-cluster$ ceph health HEALTH_OK This part of the tutorial provides some troubleshooting hints that I […]