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OpenStack Cloud Computing Cookbook by Kevin Jackson

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Increasing resilience of OpenStack services

OpenStack has been designed for highly scalable environments where it is possible to avoid single point of failures (SPOFs), but you must build this into your own environment. For example, Keystone is a central service underpinning your entire OpenStack environment, so you would build multiple instances into your environment. Glance is another service that is a key to the running of your OpenStack environment. By setting up multiple instances running these services, controlled with Pacemaker and Corosync, we can enjoy an increase in resilience to failure of the nodes running these services.

This recipe represents two nodes running both Glance and Keystone, controlled by Pacemaker with Corosync in active/passive ...

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