File /etc/hosts corrupted by set-fqdn

[DavidePrincipi]

On some NethServer 8 machines, the set-fqdn script comments out the IPv4 localhost entry in /etc/hosts, leaving only the IPv6 mapping:

# commented by set-fqdn #127.0.0.1   nethvoice localhost localhost.localdomain ...
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

This causes localhost to resolve only to ::1 (IPv6 loopback).

Steps to reproduce

• Insert the hostname in /etc/hosts, as a field of the 127.0.0.1 record. This is wrong, but some machines has it.
• Change node hostname from cluster-admin

Expected behavior

The hostname is removed from record 127.0.0.1

Actual behavior

The whole record is commented out

Components

• Core 3.18

See also

• NethCTI Server: binds to IPv6 only when /etc/hosts has localhost mapped to ::1 #7856

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Thanks to @edospadoni