/etc/cloud/templates/hosts.debian.tmpl is in cloud-init 0.7.5-0ubuntu1.18.
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 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | ## This file (/etc/cloud/templates/hosts.tmpl) is only utilized
## if enabled in cloud-config. Specifically, in order to enable it
## you need to add the following to config:
## manage_etc_hosts: True
##
## Note, double-hash commented lines will not appear in /etc/hosts
#
# Your system has configured 'manage_etc_hosts' as True.
# As a result, if you wish for changes to this file to persist
# then you will need to either
# a.) make changes to the master file in /etc/cloud/templates/hosts.tmpl
# b.) change or remove the value of 'manage_etc_hosts' in
# /etc/cloud/cloud.cfg or cloud-config from user-data
#
## The value '$hostname' will be replaced with the local-hostname
127.0.1.1 $fqdn $hostname
127.0.0.1 localhost
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts
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