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What actualy does trove, heat, celiometer

I am studying about how does OpenStack works, so I can move on with my OpenStack job. So far I have set up some basic deployment of Icehouse and now I would like to make higher level deployment. I have been reading for a while, but I actually do not understand openstack modules such as ceilometer, heat and trove. I would like to get quality answers about:

  1. Why do we need heat, we have similar tools such as nova, keystone, APi and so on?
  2. Why is used trove for, we have MySQL database and Rabbit message server? I have been reading abouttrove on http://docs.openstack.org/admin-guide-cloud/content/trove-service.html but as I mentioned before I do not get it.
  3. I understand a lit of bit ceilometer it is some monitoring and statistic module.

In early OpenStack versions which tools has been replacement for these threes?

What actualy does trove, heat, heat and celiometer

I am studying about how does OpenStack works, so I can move on with my OpenStack job. So far I have set up some basic deployment of Icehouse and now I would like to make higher level deployment. I have been reading for a while, but I actually do not understand openstack modules such as ceilometer, heat and trove. I would like to get quality answers about:

  1. Why do we need heat, we have similar tools such as nova, keystone, APi and so on?
  2. Why is used trove for, we have MySQL database and Rabbit message server? I have been reading abouttrove on http://docs.openstack.org/admin-guide-cloud/content/trove-service.html but as I mentioned before I do not get it.
  3. I understand a lit of bit ceilometer it is some monitoring and statistic module.

In early OpenStack versions which tools has been replacement for these threes?

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What actualy does trove, heat are Trove, Heat, and celiometerCeilometer used for?

I am studying about how does OpenStack works, so I can move on with my OpenStack job. So far I have set up some basic deployment of Icehouse and now I would like to make higher level deployment. I have been reading for a while, but I actually do not understand openstack modules such as ceilometer, heat and trove. I would like to get quality answers about:

  1. Why do we need heat, we have similar tools such as nova, keystone, APi and so on?
  2. Why is used trove for, we have MySQL database and Rabbit message server? I have been reading abouttrove on http://docs.openstack.org/admin-guide-cloud/content/trove-service.html but as I mentioned before I do not get it.
  3. I understand a lit of bit ceilometer it is some monitoring and statistic module.

In early OpenStack versions which tools has been replacement for these threes?