martin's blog

Understanding packet flows in OpenStack Neutron setups

One of the things that confuse people most when dealing with Software Defined Networking (SDN) in OpenStack Neutron are the packet flows.  How do these relate to all the different network interfaces - virtual and physical ones - that Neutron installations typically have? I have written up a summary using some diagrams to help people understand what all the different interfaces are good for. Three examples are given: Internet-bound packets coming from VMs, VM DHCP requests and VM metadata requests.

OpenStack meets PYUGAT: OpenStack-Community-Abend in Wien am 24. 02. 2013

Der OpenStack-Community-Abend Anfang Januar in Köln war gut besucht - so gut, dass wir aus der Veranstaltung gern eine kleine Tradition machen möchten und die OpenStack-Community-Abende in wechselnden Städten fortsetzen. Im Februar ist Wien an der Reihe: Kurzentschlossene haben am nächsten Sonntag die Möglichkeit, sich ausführlich über die OpenStack-Cloud-Umgebung zu informieren.

Auf Draht in der Wolke: Das hastexo Cloud BootCamp for OpenStack kommt nach München!

München ist toll! So toll, dass wir unseren Kunden und denen, die es werden wollen, nicht länger den Genuss eines Trainings in der Stadt Heinrichs des Löwen vorenthalten wollen: hastexos Cloud BootCamp for OpenStack kommt in die bayerische Landeshauptstadt! Vom 02.-05. April 2013 erfahren die Kursteilnehmer in deutscher Sprache alles, was sie rund um das Thema OpenStack wissen müssen. 

OpenStack DACH Community Event in Köln, Deutschland (9. Januar 2013)

Am Mittwoch, 9. Januar 2013 findet in Köln ein OpenStack DACH Community Event statt. Wer mehr über OpenStack erfahren und sich mit anderen über das Thema austauschen möchte, ist hier richtig.

OpenStack DACH Community Event in Cologne, Germany (Jan 9th, 2013)

(This blog post is also available in German)

Heads up, German OpenStack Community: There will be an OpenStack DACH community event taking place on Wednesday, Jan 9th 2013, in the city of Cologne. If you want to find out more on OpenStack or if you want to chat with others on the subject, then this is for you!

GUUG FFG, CLT, OSDC ... Conferences coming up early 2013

It's that time of the year again where everybody's thoughts are already wandering off in expecation of some well-deserved holidays. 2012 "feels" finished and 2013 is coming up with a lot of cool conferences. Some of them are taking place in the first months of the new year and I'm more than happy to announce that we will be presenting stuff at numerous occasions. 

Find out what's new on OpenStack and High Availability - at the next Design Summit!

It's an incredibly busy time for our us at the moment and we really appreciate all the positive feedback that we have gotten so far on the subject of OpenStack and High Availability.

OSMC 2012: I'm speaking!

The people at Netways have just published the official agenda for this year's edition of the Open Source Monitoring Conference (OSMC) - and I'm in! Yours truly will be presenting Pacemaker's advanced monitoring features, including an overview over the actual monitoring architecture in Pacemaker and some best practice hints for authors of resource agents.

Failover testing: some technical background

Every now and then, customers get in touch with us because they think that their Pacemaker cluster setup is misbehaving. Quite often, such a belief results from the observations after the attempt to test Pacemaker's fail-over capabilities by cutting one communication link between the cluster nodes (or cutting all links at the same time). In fact, neither cutting a single communication link nor cutting all links between the nodes will lead to a fail-over. To understand why that is the case, we'll have to dig into the subject a little bit deeper.

Hochverfügbarkeit für Icinga - Intensiv-Workshop im Vorfeld der OSMC

Wer aus erster Hand erfahren möchte, wie die Kombination aus Icinga und dem Pacemaker-Clustermanager zum hochverfügbaren Monitoring-System wird, sollte meinen Workshop dazu im Vorfeld der diesjährigen Open Source Monitoring Conference (OSMC) nicht verpassen. Die OSMC hat sich in den letzten Jahren zu einem der wichtigsten Monitoring-Events in Europa entwickelt.

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