Gathering the pieces and building a picture

Let's try to see how OpenStack works by chaining all the service cores covered in the previous sections in a series of steps:

  1. A user accesses the OpenStack environment via a web interface (HTTP/REST).
  2. Authentication is the first action performed. This is where Keystone comes into the picture.
  3. A conversation is started with Keystone—"Hey, I would like to authenticate and here are my credentials".
  4. Keystone responds "OK, then you may authenticate and give the token" once the credentials have been accepted
  5. You may remember that the service catalog comes with the token as a piece of code, which will allow you to access resources. Now you have it!
  6. The service catalog, during its turn, will incorporate the code by ...

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