Fully Qualified Domain Name Check Linux. Displays the alias name of the host. The generic name or the FQDN and its IP address is the Fully Qualified Host Name FQHN.
The hostname command has a number of options you can use for more specific outputs. It is part of DNS Domain name System. Host name file etchostname will only provide host name with fully qualified domain name.
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In this example you can see the displayed domain name is the same as we set up using -b option. If this is not set and the sssd does not have access to the fully qualified hostname dynamic updates will fail. The fully qualified domain name consists of three or more labels. This often means that only the host name is given.