How do you take outside sensitive information in Perl

How do you take outside sensitive information in Perl

Sometimes I do hard coding to stuff that is important like IPs and passwords:
eval {
$ldap = LDAPModule->new(
host => '1.1.1.1',
domain => 'my.domain.local',
)->authenticate( $args->{id}, $args->{pw} );
};
...
What ways we have to hide such information or manage better (modules?,
take outside? .... )