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heat orchestration

asked 2019-05-15 09:17:50 -0500

lelunicu gravatar image

hi, i like to clarify. heat orchestration -coordonate all the prcesses that are necessary in order to setup a instance.right? it means this coordonate the neutron processes with glance processes with nove processes in order to setup an instance. tnx

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answered 2019-05-15 15:00:54 -0500

zaneb gravatar image

Historically there have been two uses of the term 'orchestration' in the OpenStack community. I suspect that this may be at the root of your question.

The first (and wrong ;) use of the term was to describe a way to organise the internal state of the Nova API to keep track of the various external things it has to co-ordinate in order to start an instance - nova-compute, cinder, neutron, &c. This is not what Heat is doing.

Heat's purpose is to orchestrate the end-user's application: it allows you to provide a declarative model of the desired topology, and then infers the dependencies and makes all of the API calls necessary to make it a reality (as well as keeping track of errors, allowing updates to the model, and so on).

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answered 2019-05-15 10:31:45 -0500

No, it doesn’t coordinate OpenStack processes. It creates resources - instances, ports, routers, volumes and so on - and links them together to form an application.

From the documentation:

Heat provides a template based orchestration for describing a cloud application by executing appropriate OpenStack API calls to generate running cloud applications.

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links them together to form an application.this is not clear to me. i know that an application run inside an instance.

lelunicu gravatar imagelelunicu ( 2019-05-16 02:37:30 -0500 )edit

An application can run on many instances, use many volumes, be attached to several networks etc. Imagine a web site: Several web servers, database servers, application servers; several network tiers. Heat allows you to describe all that in a template and launch and manage the application.

Bernd Bausch gravatar imageBernd Bausch ( 2019-05-16 03:12:07 -0500 )edit

this can be an e-business application.web server or database server so on can run on different physical servers.right? web server database server so on will run only on compute servers.right?

lelunicu gravatar imagelelunicu ( 2019-05-16 06:15:33 -0500 )edit

I don't understand your question. The point of my example is that all these servers run on instances.

Bernd Bausch gravatar imageBernd Bausch ( 2019-05-16 07:07:59 -0500 )edit

some instances contain web server other instances contain database server so on.then all those instances are load balanced between compute nodes.right?

lelunicu gravatar imagelelunicu ( 2019-05-16 09:03:32 -0500 )edit

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Asked: 2019-05-15 09:17:50 -0500

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Last updated: May 15