/etc/maas/maas_cluster.conf is in maas-cluster-controller 1.2+bzr1373+dfsg-0ubuntu1~12.04.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | # This file is used by the cluster controller startup script:
# `maas-provision start-cluster-controller`
# to get the URL to the MAAS region controller's API. Normally, packaging
# will update this file automatically but it may also be configured manually.
MAAS_URL=http://localhost/MAAS
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