x/development-proposals
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Merge "explain reference to the "pet model""

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2016-06-06 14:40:48 +00:00
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user-stories/proposed/ha_vm.rst
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@@ -211,3 +211,11 @@ Glossary
operational performance for a higher than normal period. Not to be operational performance for a higher than normal period. Not to be
confused with 100% availability, which is sometimes described as confused with 100% availability, which is sometimes described as
`fault tolerance <https://en.wikipedia.org/wiki/Fault_tolerance>`_. `fault tolerance <https://en.wikipedia.org/wiki/Fault_tolerance>`_.
* `Pets and cattle
<http://www.theregister.co.uk/2013/03/18/servers_pets_or_cattle_cern/>`_ -
a metaphor commonly used in the OpenStack community to describe the
difference between two service architecture models: cloud-native,
stateless, disposable instances with built-in resilience in the
application layer (cattle), vs. legacy, stateful instances with no
built-in resilience (pets).