In most Linux distributions, if there are multiple entries for a host in
/etc/hosts the first entry has precedence. With the Puppet host resource,
if there are multiple entries for that name, Puppet will modify the last
entry.
So if a system has a /etc/hosts file with the following entries:
127.0.0.5 testhost
127.0.0.6 testhost
testhost will resolve to 127.0.0.5
When a Puppet host resource is applied to that server like
host { 'testhost':
ip => '127.0.0.7',
}
The /etc/hosts file will become
127.0.0.5 testhost
127.0.0.7 testhost
And testhost will still resolve to 127.0.0.5.
I have seen this behavior in Puppet 6 and Puppet 7.
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