顯示目前的主機名稱 /其它資訊
$ hostnamectl
$ hostnamectl
Static hostname: picaa 這是一台VM
Icon name: computer-vm
Chassis: vm
Machine ID: 153a217486fe4be8a8db123db67ed581
Boot ID: a8f3c1328e154cf6b169641238054b97
Virtualization: kvm
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 4.14.12-x86_64-linode92
Architecture: x86-64
$ hostnamectl
Static hostname: box203 這是一台實體主機
Icon name: computer-laptop
Chassis: laptop
Machine ID: b18ae35b56a14ff68ff3ce08f2b62394
Boot ID: ab99ab06bc194a3eb4f0c220c46b1355
Operating System: CentOS Linux 7 (Core)
CPE OS Name: cpe:/o:centos:centos:7
Kernel: Linux 3.10.0-862.9.1.el7.x86_64
Architecture: x86-64
修改主機名稱
$ hostnamectl set-hostname 新的名稱例如：
hostnamectl set-hostname myserver
檢查是否修改成功 (「目前的值」)
$ cat /proc/sys/kernel/hostname
hostname 資料存放在
/etc/hostname
( CentOS 6 以前是 /etc/sysconfig/network )
手動修改這個檔案也可以，但無法馬上生效，得重開機
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另外， CentOS 也可以用
圖形介面來修改 IP/Hostname 資料：
$ nmtui
nmcli 也可查詢、設定網路介面
$ nmcli enp2s0: connected to eth0 "Broadcom Limited NetXtreme BCM5723 Gigabit Ethernet PCIe (NC107i Integrated PCI Express Gigabit Server ethernet (tg3), B4:99:BA:B5:34:B8, hw, mtu 1500 ip4 default inet4 192.168.0.3/24 route4 192.168.0.0/24 route4 0.0.0.0/0 lo: unmanaged "lo" loopback (unknown), 00:00:00:00:00:00, sw, mtu 65536 DNS configuration: servers: 8.8.8.8 interface: enp2s0 Use "nmcli device show" to get complete information about known devices and "nmcli connection show" to get an overview on active connection profiles. Consult nmcli(1) and nmcli-examples(5) manual pages for complete usage details.
改 IP
檔案在 /etc/sysconfig/network-scripts/$ ls -l -rw-r--r--. 1 root root 358 Apr 6 2021 ifcfg-eth0 -rw-r--r--. 1 root root 359 Sep 1 2020 ifcfg-eth0.20200901 -rw-r--r--. 1 root root 254 May 22 2020 ifcfg-lo lrwxrwxrwx. 1 root root 24 Nov 29 2021 ifdown -> ../../../usr/sbin/ifdown -rwxr-xr-x. 1 root root 654 May 22 2020 ifdown-bnep -rwxr-xr-x. 1 root root 6532 May 22 2020 ifdown-eth $ cat ifcfg-eth0 TYPE=Ethernet PROXY_METHOD=none BROWSER_ONLY=no BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=eth0 UUID=2253034d-d7b7-43df-986e-851f1c67e110 DEVICE=eth0 ONBOOT=yes IPADDR=192.168.0.211 PREFIX=24 GATEWAY=192.168.0.1 DNS1=8.8.8.8 IPV6_PRIVACY=no
