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/etc/maas/bootresources.yaml is in maas-cluster-controller 1.5.4+bzr2294-0ubuntu1.2.

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##
## Boot image download configuration.
##
#
# Items in this configuration:
#
# boot - the root for these settings.
#
#   storage - location on the filesystem where boot images are stored.
#
# These images can get quite large: some files are hundreds of megabytes,
# and you may need multiple copies for different architectures, OS releases,
# etc.
#
#   sources - one or more sources of downloadable boot images.
#
# Each source downloads from one simplestreams URL, though it is possible to
# have multiple sources using the same URL.
#
#     path - for each source, the path to its (online) Simplestreams data.
#
#     keyring - for each source, a GPG keyring to verify images' signatures.
#
#     selections - for each source, one or more sets of constraints for images.
#
# From each source, only those images are imported which match at least one of
# the source's selections.  A selection can specify an OS release, a CPU
# architecture, and so on.
#
# Be careful: the items in a selection will multiply.  For example if you
# specify architectures "i386" and "amd64", and subarchitectures "generic",
# "hwe-s", and "hwe-t", the import script will need to import 6 images, for
# each possible combination.  If you only want some of those combinations,
# keep them as separate sources and/or selections.

boot:
  ## Marker: this configuration has not been initialised yet.
  #
  # If this is set to True during installation or a later upgrade, it means
  # that this configuration file has not been edited by a human or by MAAS
  # itself.  When you edit this configuration to suit your needs, be sure to
  # remove this setting, or change it to False, so that a future upgrade will
  # know not to overwrite the configuration file.
  #
  # If the setting is True, the upgrade procedure will look for downloaded
  # boot images that predate the current, Simplestreams-based import
  # mechanism, and rewrite the configuration based on what it finds.  The new
  # configuration will import the new-style equivalents of the images that
  # were imported in the old setup.
  configure_me: True

  storage: "/var/lib/maas/boot-resources/"

  sources:
    - path: "http://maas.ubuntu.com/images/ephemeral-v2/releases/"
      keyring: "/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg"
      selections:
        - release: "trusty"
          arches: ["i386", "amd64"]
          subarches: ["generic"]
          labels: ["release"]
        - release: "precise"
          arches: ["i386", "amd64"]
          subarches: ["generic"]
          labels: ["release"]