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File: //usr/share/doc/cloud-init/examples/cloud-config-phone-home.txt
#cloud-config

# phone_home: if this dictionary is present, then the phone_home
# cloud-config module will post specified data back to the given
# url
# default: none
# phone_home:
#  url: http://my.foo.bar/$INSTANCE/
#  post: all
#  tries: 10
#
phone_home:
 url: http://my.example.com/$INSTANCE_ID/
 post: [ pub_key_dsa, pub_key_rsa, pub_key_ecdsa, instance_id ]