1. Check the local system version
[root@server-01 ~]# cat /etc/os-release
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"
CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"
2. Help description of hostname in Linux
[root@server-01 ~]# hostname --help
Usage: hostname [-b] {hostname|-F file} set host name (from file)
hostname [-a|-A|-d|-f|-i|-I|-s|-y] display formatted name
hostname display host name
{yp,nis,}domainname {nisdomain|-F file} set NIS domain name (from file)
{yp,nis,}domainname display NIS domain name
dnsdomainname display dns domain name
hostname -V|--version|-h|--help print info and exit
Program name:
{yp,nis,}domainname=hostname -y
dnsdomainname=hostname -d
Program options:
-a, --alias alias names
-A, --all-fqdns all long host names (FQDNs)
-b, --boot set default hostname if none available
-d, --domain DNS domain name
-f, --fqdn, --long long host name (FQDN)
-F, --file read host name or NIS domain name from given file
-i, --ip-address addresses for the host name
-I, --all-ip-addresses all addresses for the host
-s, --short short host name
-y, --yp, --nis NIS/YP domain name
Description:
This command can get or set the host name or the NIS domain name. You can
also get the DNS domain or the FQDN (fully qualified domain name).
Unless you are using bind or NIS for host lookups you can change the
FQDN (Fully Qualified Domain Name) and the DNS domain name (which is
part of the FQDN) in the /etc/hosts file.
3. Chinese help description of hostname
Usage: hostname[-b]{hostname |-F file} set hostname (from file)
hostname [-a|-a|-d|-f|-i|-i|-s|-y] display formatted name
hostname show hostname
{yp,nis,} domain name {nisdomain | -F file} set nis domain name (from file)
{yp, nis, } domain names show nis domain names
dnsdomainname show dns domain name
hostname -V|--version|-h|--help print info and exit
Program name:
{yp,nis,}domain=hostname-y
dnsdomainname=hostname -d
Program options:
-a, --alias alias
-A, --all fqdns all long hostnames (FQDNs)
-b, --if no hostname is available, start setting default hostname
-d, --domain DNS domain name
-f, --fqdn, --long hostname (fqdn)
-F, --Read hostnames or NIS domain names from the given file
-i, --the ip address of the hostname
-I, --all ip address all addresses of the host
-s, --short hostname
-y, --yp, --nis nis/yp domain name
describe:
This command can get or set the hostname or NIS domain name. you can
It is also possible to get the DNS domain or FQDN (Fully Qualified Domain Name).
Unless you're using bind or NIS for host lookups, you can change
FQDN (Fully Qualified Domain Name) and DNS Domain Name (
part of the FQDN).Fourth, the basic use of the hostname command
1. Check the computer name
[root@server-01 ~]# hostname
server-01
2. View all IP addresses on the machine
[root@server-01 ~]# hostname -I
192.168.200.150 172.17.0.1 172.21.0.1 172.19.0.1 172.20.0.1
3. View the host FQDN
[root@server-01 ~]# hostname -f
server-01
4. View the short host name
[root@server-01 ~]# hostname -s
server-01
Five, the use of hostnamectl
1. View host details
[root@server-01 ~]# hostnamectl
Static hostname: server-01
Icon name: computer-vm
Chassis: vm
Machine ID: 8daa9318d5564417b557c0bf5b06c3b8
Boot ID: f45c90c8ca254ef28bf4da5b04bdafdf
Virtualization: kvm
Operating System: CentOS Linux 8 (Core)
CPE OS Name: cpe:/o:centos:centos:8
Kernel: Linux 4.18.0-240.10.1.el8_3.x86_64
Architecture: x86-64
2. Set the hostname
[root@server-01 ~]# hostnamectl set-hostname test
3. The command help of hostnamectl
[root@server-01 ~]# hostnamectl --help
hostnamectl [OPTIONS...] COMMAND ...
Query or change system hostname.
-h --help Show this help
--version Show package version
--no-ask-password Do not prompt for password
-H --host=[USER@]HOST Operate on remote host
-M --machine=CONTAINER Operate on local container
--transient Only set transient hostname
--static Only set static hostname
--pretty Only set pretty hostname
Commands:
status Show current hostname settings
set-hostname NAME Set system hostname
set-icon-name NAME Set icon name for host
set-chassis NAME Set chassis type for host
set-deployment NAME Set deployment environment for host
set-location NAME Set location for host