Usually, the hosts file is parsed before DNS or NIS, so it is most common to change the FQDN in /etc/hosts. Therefore it depends on the configuration of the resolver (usually in /etc/nf) how you can change it. The DNS domain name is the part after the first dot. Technically: The FQDN is the name getaddrinfo returns for the hostname returned by gethostname. For example, if the hostname was " mysubdomain", one might have a line in /etc/hosts which reads: 127.0.1.1 ursula The recommended method of setting the FQDN is to make the hostname be an alias for the fully qualified name using /etc/hosts, DNS, or NIS. You cannot change the FQDN with hostname or dnsdomainname. You can check the FQDN using hostname -fqdn or the domain name using dnsdomainname. It is usually the hostname followed by the DNS domain name (the part after the first dot). The FQDN (fully qualified domain name) of the system is the name that the resolver returns for the hostname, such as. If a parameter is given (or -file name ) then root (the superuser) can also set a new NIS domain. Print version information on standard output and exit successfully.ĭisplay the NIS domain name. This is the hostname cut at the first dot. Do not make any assumptions about the order of the output.ĭisplay the short hostname. Contrary to option -i, this option does not depend on name resolution. The loopback interface and IPv6 link-local addresses are omitted. This option enumerates all configured addresses on all network interfaces. Avoid using this option if at all possible use hostname -all-ip-addresses instead.ĭisplay all network addresses of the host. Note that this works only if the hostname can be resolved. Comments (lines starting with a ` #') are ignored.ĭisplay the network address(es) of the hostname. Read the hostname from the specified file. See the warnings in the FQDN section, and avoid using this option if at all possible use hostname -all-fqdns instead. Unless you are using BIND (Berkeley Internet Name Domain) or NIS for host lookups, you can change the FQDN and the DNS domain name (which is part of the FQDN) in the /etc/hosts file. A FQDN consists of a short hostname and the DNS domain name. See the warnings in the FQDN section, and avoid using this option if at all possible.ĭisplay the FQDN (fully qualified domain name). Don't use the command domainname to get the DNS domain name because it shows the NIS domain name and not the DNS domain name. Do not make any assumptions about the order of the output.Īlways set a hostname this allows the file specified by -F to be non-existant or empty, in which case the default hostname localhost will be used if none is yet set.ĭisplay the name of the DNS domain. Note that different addresses may resolve to the same name, therefore the output may contain duplicate entries. Addresses that cannot be translated (i.e., because they do not have an appropriate reverse DNS entry) are skipped. This option enumerates all configured network addresses on all configured network interfaces, and translates them to DNS domain names. This option is deprecated and should not be used anymore.ĭisplays every FQDN of the machine. hostname hostname Options -a, -aliasĭisplay the alias name of the host (if used). The hostname is usually set once at system startup in the script /etc/init.d/hostname.sh normally by reading the contents of a file which contains the hostname, e.g., /etc/hostname. When called with one argument or with the -file option, hostname sets the system's hostname using the sethostname function. When called without any arguments, hostname displays the name of the system as returned by the gethostname function. Hostname is used to display the system's DNS name, and to display or set its hostname or NIS (Network Information Services) domain name.
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