Feature Spotlight - Smart Resource Restart from the Command Line 1 minute readAnatomy of resource restart
Feature Spotlight - Controllable Resource Discovery 1 minutes readComing in 1.1.13 is a new option for location constraints: resource-discovery
Now powered by Octopress less than 1 minute readWith Posterous being shut down (even though I wasn’t using it for TheClusterGuy), I’ve decided the time has come to take back control of my content.
New Logo? less than 1 minute readOne unexpected outcome from the recent Linux Plumbers conference was the contribution of a new logo to the project by NTT.
Website Updates less than 1 minute readThe http://www.clusterlabs.org server has been migrated and now features a new splash-page and a custom skin for the wiki.
Another Documentation Update less than 1 minute readQuick FYI… I’ve made some more improvements to the Configuration Explained PDF http://clusterlabs.org/mediawiki/images/f/fb/Configuration_Explained.pdf
Updated Documentation less than 1 minute readThe Configuration Explained PDF has been updated for 1.0.4/5 [http://clusterlabs.org/mediawiki/images/f/fb/Configuration_Explained.pdf]
Release Candidate: 1.1.12-rc1 6 minutes readAs promised, this announcement brings the first release candidate for Pacemaker 1.1.12
Potential for data corruption affecting Pacemaker 1.1.6 through 1.1.9 2 minutes readIt has come to my attention that the potential for data corruption exists in Pacemaker versions 1.1.6 to 1.1.9
Release candidate: 1.1.10-rc7 1 minute readAnnouncing the seventh release candidate for Pacemaker 1.1.10
Release candidate: 1.1.10-rc6 1 minute readAnnouncing the sixth release candidate for Pacemaker 1.1.10
Release candidate: 1.1.10-rc5 2 minutes readLets try this again… Announcing the fourth and a half release candidate for Pacemaker 1.1.10
Release candidate: 1.1.10-rc3 2 minutes readAnnouncing the third release candidate for Pacemaker 1.1.10
Release candidate: 1.1.10-rc2 1 minute readAnnouncing the second release candidate for Pacemaker 1.1.10
Pacemaker 1.0.13 now available 1 minutes readThanks once again to the efforts of the fine folks from NTT, the latest bug fixes have been back-ported from 1.1 and another instalment of the Pacemaker 1.0 ...
Pacemaker 1.0.12 Released 1 minute readThanks once again to the efforts of Keisuke MORI from NTT, the latest bug fixes have been back-ported from 1.1 and another instalment of the Pacemaker 1.0 re...
Pacemaker 1.0.11 Released 2 minutes readThe latest installment of the Pacemaker 1.0 release series is now ready for general consumption.
Pacemaker 1.1.5 Released less than 1 minute readThe latest installment of the Pacemaker 1.1 release series is now ready for general consumption.
Pacemaker 1.0.9 Released 5 minutes readThe latest installment of the Pacemaker 1.0 stable series is now ready for general consumption.
Pacemaker 1.0.8 Released 4 minutes readThe latest installment of the Pacemaker 1.0 stable series is now ready for general consumption.
New Pacemaker Release Series 3 minutes readA number of new branches have been created in the last few days which are integral to how we plan to add new features in a controlled manner.
Pacemaker removed from OBS less than 1 minute readToday I removed Pacemaker from server:ha-clustering on the openSUSE build service.
Pacemaker 1.0.7 Released 4 minutes readThe latest installment of the Pacemaker 1.0 stable series is now ready for general consumption.
Pacemaker 1.0.6 Released 4 minutes readThe next installment of the Pacemaker 1.0 stable series is now ready for general consumption.
Advisory: Don’t use Pacemaker on Corosync (yet) less than 1 minute readI spent some time looking into the state of the Pacemaker/Corosync integration today and I can only recommend Pacemaker users stay on the previous version of...
Clusters From Scratch less than 1 minute readThe first of a new series of step-by-step guides for Pacemaker.
Dev Repository Recreated less than 1 minute readFor a variety of reasons, the Pacemaker dev repository has been recreated and its history pruned of non-pacemaker related changes.
Pacemaker 1.0.5 Released 2 minutes readI’m back from vacation so it’s time for another Pacemaker bug-fix release. Testing went flawlessly and so without further ado, here it is…
Pacemaker 1.0.4 Released 2 minutes readIt took a little longer than expected, but the latest 1.0 maintenance release (1.0.4) is finally available.
HA for Composible Deployments of OpenStack 5 minutes readComposable roles are a hot topic, I present a proposal for how to accommodate cluster-managed services.
Thoughts on HA for Multi-Subnet Deployments of OpenStack 3 minutes readInstalling OpenStack in a spine-and-leaf network presents problems for high availability, these are some thoughts on what do to about it.
Evolving the OpenStack HA Architecture 3 minutes readA future revision of the HA architecture should limit Pacemaker involvement to services like Galera, Rabbit and the few remaining OpenStack services that can...
Savaged by Softdog, a Cautionary Tale 6 minutes readHardware is imperfect, and software contains bugs. Don’t use software based watchdogs and expect to survive the latter.
A New Fencing Mechanism (TBD) 4 minutes readProtecting database centric applications in the absense of power fencing
A New Fencing Mechanism (TBD) 4 minutes readProtecting database centric applications in the absense of power fencing
HA for Composible Deployments of OpenStack 5 minutes readComposable roles are a hot topic, I present a proposal for how to accommodate cluster-managed services.
Thoughts on HA for Multi-Subnet Deployments of OpenStack 3 minutes readInstalling OpenStack in a spine-and-leaf network presents problems for high availability, these are some thoughts on what do to about it.
Evolving the OpenStack HA Architecture 3 minutes readA future revision of the HA architecture should limit Pacemaker involvement to services like Galera, Rabbit and the few remaining OpenStack services that can...
Minimum Viable Cluster 9 minutes readThe is a spectrum for availability solutions, where you fit depends on what assumptions you can make about your application stack.
Receiving Reliable Notification of Cluster Events 3 minutes readA more reliable way to receive notification of cluster events is coming in Pacemaker 1.1.14.
Fencing for Fun and Profit with SBD 6 minutes readSBD can be particularly useful in environments where traditional fencing mechanisms are not possible.
Double Failure - Get out of Jail Free? Not so Fast less than 1 minute readIt’s tempting to explain away some recovery scenarios, but it’s not always appropriate.
Adding Managed Compute Nodes to a Highly Available Openstack Control Plane 5 minutes readAs previously announced on RDO list and GitHub, we now have a way to allow Pacemaker to manage compute nodes within a single cluster while still allowing us ...
A New Fencing Mechanism (TBD) 4 minutes readProtecting database centric applications in the absense of power fencing
Minimum Viable Cluster 9 minutes readThe is a spectrum for availability solutions, where you fit depends on what assumptions you can make about your application stack.
Receiving Reliable Notification of Cluster Events 3 minutes readA more reliable way to receive notification of cluster events is coming in Pacemaker 1.1.14.
Fencing for Fun and Profit with SBD 6 minutes readSBD can be particularly useful in environments where traditional fencing mechanisms are not possible.
Double Failure - Get out of Jail Free? Not so Fast less than 1 minute readIt’s tempting to explain away some recovery scenarios, but it’s not always appropriate.
Containerizing Databases with Kubernetes and Stateful Sets 5 minutes readAn examination of the canonical StatefulSet example for managing databases with Kubernetes from a rigorous HA perspective.
New Documentation Formats less than 1 minute readI’m pleased to report that the core Pacemaker documentation is now available in PDF, HTML (chunked and single page) and even TXT formats.
Clusters From Scratch less than 1 minute readThe first of a new series of step-by-step guides for Pacemaker.
Another Documentation Update less than 1 minute readQuick FYI… I’ve made some more improvements to the Configuration Explained PDF http://clusterlabs.org/mediawiki/images/f/fb/Configuration_Explained.pdf
Updated Documentation less than 1 minute readThe Configuration Explained PDF has been updated for 1.0.4/5 [http://clusterlabs.org/mediawiki/images/f/fb/Configuration_Explained.pdf]
A New Fencing Mechanism (TBD) 4 minutes readProtecting database centric applications in the absense of power fencing
Fencing for Fun and Profit with SBD 6 minutes readSBD can be particularly useful in environments where traditional fencing mechanisms are not possible.
raison d’etre 1 minute readThis tumbl/blog/thingy exists because I’ve finally accepted that “If we build it, they will come” is a fallacy. The internet is a big place and if you don’t...
Savaged by Softdog, a Cautionary Tale 6 minutes readHardware is imperfect, and software contains bugs. Don’t use software based watchdogs and expect to survive the latter.
Two Nodes - The Devil is in the Details 9 minutes readMany people love 2-node clusters because they seem conceptually simpler and 33% cheaper, but most will have subtle failure modes
Containerizing Databases with Kubernetes and Stateful Sets 5 minutes readAn examination of the canonical StatefulSet example for managing databases with Kubernetes from a rigorous HA perspective.
A Brief, Incomplete, and Mostly Wrong History of Programming Languages less than 1 minute readA Brief, Incomplete, and Mostly Wrong History of Programming Languages
Mixing Pacemaker versions 2 minutes readWhen mixing Pacemaker versions, there are two factors that need to be considered. The first is obviously the package version - if that is the same, then the...
Containerizing Databases with Kubernetes and Stateful Sets 5 minutes readAn examination of the canonical StatefulSet example for managing databases with Kubernetes from a rigorous HA perspective.
A New Fencing Mechanism (TBD) 4 minutes readProtecting database centric applications in the absense of power fencing
Containerizing Databases with Kubernetes and Stateful Sets 5 minutes readAn examination of the canonical StatefulSet example for managing databases with Kubernetes from a rigorous HA perspective.
HA for Composible Deployments of OpenStack 5 minutes readComposable roles are a hot topic, I present a proposal for how to accommodate cluster-managed services.
Thoughts on HA for Multi-Subnet Deployments of OpenStack 3 minutes readInstalling OpenStack in a spine-and-leaf network presents problems for high availability, these are some thoughts on what do to about it.
Evolving the OpenStack HA Architecture 3 minutes readA future revision of the HA architecture should limit Pacemaker involvement to services like Galera, Rabbit and the few remaining OpenStack services that can...
Minimum Viable Cluster 9 minutes readThe is a spectrum for availability solutions, where you fit depends on what assumptions you can make about your application stack.
Double Failure - Get out of Jail Free? Not so Fast less than 1 minute readIt’s tempting to explain away some recovery scenarios, but it’s not always appropriate.
Life at the Intersection of Pets and Cattle 5 minutes readThe theory goes that pets have no place in the server room. Everything should be stateless and replicated. If one copy dies, who cares, there are 100 more.
Adding Managed Compute Nodes to a Highly Available Openstack Control Plane 5 minutes readAs previously announced on RDO list and GitHub, we now have a way to allow Pacemaker to manage compute nodes within a single cluster while still allowing us ...
Adding Managed Compute Nodes to a Highly Available Openstack Control Plane 5 minutes readAs previously announced on RDO list and GitHub, we now have a way to allow Pacemaker to manage compute nodes within a single cluster while still allowing us ...
Large Cluster Performance: Redux 3 minutes readNormally I have access to 4 virtual cluster nodes on my laptop, however for the first time since leaving SUSE, I have had the opportunity to test with 8 and ...
Large Cluster Performance 2 minutes readOver the last few days, I’ve spent a bunch of time improving Pacemaker’s performance in large clusters.
Savaged by Softdog, a Cautionary Tale 6 minutes readHardware is imperfect, and software contains bugs. Don’t use software based watchdogs and expect to survive the latter.
Adding Managed Compute Nodes to a Highly Available Openstack Control Plane 5 minutes readAs previously announced on RDO list and GitHub, we now have a way to allow Pacemaker to manage compute nodes within a single cluster while still allowing us ...
GPG Quickstart 5 minutes readIt seemed timely that I should refresh both my GPG knowledge and my keys. I am summarizing my method (and sources) below in the event that they may prove use...
Mixing Pacemaker versions 2 minutes readWhen mixing Pacemaker versions, there are two factors that need to be considered. The first is obviously the package version - if that is the same, then the...
Feature Spotlight: Utilization 2 minutes readNew in 1.1 is the ability for Pacemaker to factor the system resources (RAM, CPU, etc) into its placement algorithms.
Version Control Prompt 1 minute readI find it convenient to include current SCM data before my regular Bash prompt (reduces the chance of “accidents”). Perhaps someone else will find it useful ...
Choose the Right Hardware 1 minute readRecently I was asked to help diagnose a cluster that was behaving incredibly badly.
Why Wont the Cluster Start my Services? 2 minutes readIts a common question and a worthy topic for an extended article. Here’s the steps I usually follow when diagnosing such issues.
Savaged by Softdog, a Cautionary Tale 6 minutes readHardware is imperfect, and software contains bugs. Don’t use software based watchdogs and expect to survive the latter.
Photo credit: WeGraphics Photo credit: WeGraphics