Интерактивная система просмотра системных руководств (man-ов)
dnsdomainname (1)
dnsdomainname (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
>> dnsdomainname (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
NAME
hostname - show or set the system's host name
domainname - show or set the system's NIS/YP domain name
dnsdomainname - show the system's DNS domain name
nisdomainname - show or set system's NIS/YP domain name
ypdomainname - show or set the system's NIS/YP domain name
Hostname
is the program that is used to either set or display
the current host, domain or node name of the system. These names are used
by many of the networking programs to identify the machine. The domain
name is also used by NIS/YP.
GET NAME
When called without any arguments, the program displays the current
names:
hostname
will print the name of the system as returned by the
gethostname(2)
function.
domainname, nisdomainname, ypdomainname
will print the name of the system as returned by the
getdomainname(2)
function. This is also known as the YP/NIS domain name of the system.
dnsdomainname
will print the domain part of the FQDN (Fully Qualified Domain Name). The
complete FQDN of the system is returned with
hostname --fqdn.
The function
gethostname(2)
is used to get the hostname. Only when the
hostname -s
is called will
gethostbyname(3)
be called. The difference in
gethostname(2)
and
gethostbyname(3)
is that
gethostbyname(3)
is network aware, so it consults
/etc/nsswitch.conf
and
/etc/host.conf
to decide whether to read information in
/etc/sysconfig/network
or
/etc/hosts
the
hostname
is also set when the network interface is brought up.
SET NAME
When called with one argument or with the
--file
option, the commands set the host name, the NIS/YP domain name or
the node name.
Note, that only the super-user can change the names.
It is not possible to set the FQDN or the DNS domain name with the
dnsdomainname
command (see
THE FQDN
below).
The host name is usually set once at system startup in
/etc/rc.d/rc.inet1
or
/etc/init.d/boot
(normally by reading the contents of a file which contains
the host name, e.g.
/etc/hostname).
THE FQDN
You can't change the FQDN (as returned by
hostname --fqdn)
or the DNS domain name (as returned by
dnsdomainname)
with this command. The FQDN of the system is the name that the
resolver(3)
returns for the host name.
Technically: The FQDN is the name
gethostbyname(2)
returns for the host name returned by
gethostname(2).
The DNS domain name is the part after the first dot.
Therefore it depends on the configuration (usually in
/etc/host.conf)
how you can change it. Usually (if the hosts file is parsed before DNS or
NIS) you can change it in
/etc/hosts.
OPTIONS
-a, --alias
Display the alias name of the host (if used).
-d, --domain
Display the name of the DNS domain. Don't use the command
domainname
to get the DNS domain name because it will show the NIS domain name and
not the DNS domain name. Use
dnsdomainname
instead.
-F, --file filename
Read the host name from the specified file. Comments (lines starting with
a `#') are ignored.
-f, --fqdn, --long
Display the FQDN (Fully Qualified Domain Name). A FQDN consists of a
short host name and the DNS domain name. Unless you are using bind 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.
-h, --help
Print a usage message and exit.
-i, --ip-address
Display the IP address(es) of the host.
-s, --short
Display the short host name. This is the host name cut at the first dot.
-V, --version
Print version information on standard output and exit successfully.
-v, --verbose
Be verbose and tell what's going on.
-y, --yp, --nis
Display the NIS domain name. If a parameter is given (or
--file name
) then root can also set a new NIS domain.
FILES
/etc/hosts/etc/sysconfig/network
NOTE
Note that hostname doesn't change anything permanently. After reboot
original names from /etc/hosts are used again.
