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[OpenStack Infra <1779889@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/631110
Committed: https://git.openstack.org/cgit/openstack/keystone/commit/?id=f471879b82d08316846e7e4a0ff75c4b3b90dabf
Submitter: Zuul
Branch:    master

commit f471879b82d08316846e7e4a0ff75c4b3b90dabf
Author: Kristi Nikolla <kristi@xxxxxxxxxx>
Date:   Tue Jan 15 20:47:38 2019 -0500

    Add documentation for service tokens
    
    Updated documentation to include explanation and configuration
    settings for service tokens.
    
    Change-Id: I8a518614302e17be6dfc8d88dee5efe27a89edb0
    Closes-Bug: #1779889


** Changed in: keystone
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1779889

Title:
  Lack of documentation for validating expired tokens with service users

Status in OpenStack Identity (keystone):
  Fix Released

Bug description:
  Keystone supports the ability for service users to validate expired
  user tokens. This solved an issue where a user would initiate a long-
  running operation (e.g. live migration, instance back-ups, uploading
  large images to glance), and by the time the operation finished the
  user's token would be invalid, causing the operation to fail.

  The solution to this problem is to use service users and configure
  them in such a way that they have the ability to validate expired user
  tokens. This keeps enforcement of the user's authorization valid when
  they start the operation but allows the operation to finish in the
  event it takes longer than the configured token expiration time.

  We don't supply any documentation for this process or setting it up
  outside of the original specification [0]. If deployers want to use
  it, they have to dig through code to figure out how it work.

  The lack of documentation was brought to our attention in IRC [1].

  [0] https://specs.openstack.org/openstack/keystone-specs/specs/keystonemiddleware/implemented/service-tokens.html
  [1] http://eavesdrop.openstack.org/irclogs/%23openstack-keystone/%23openstack-keystone.2018-07-03.log.html#t2018-07-03T14:43:49

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