See also: How to manage controllers

In software design, a controller is an architectural component responsible for managing the flow of data and interactions within a system, and for mediating between different parts of the system. In Juju, it is defined in the same way, with the mention that:

  • It is set up via the bootstrap process.

  • It refers to the initial controller unit as well as any units added later on (for machine clouds, for the purpose of high-availability) – each of which includes
  • It is responsible for implementing all the changes defined by a Juju user via a Juju client post-bootstrap.

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