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早期 Ubuntu 修改主機名稱需要透過修改 /etc/hostname + 使用 hostname 指令才能完成，在某些情況下甚至需要重新啟動系統。而在 Ubuntu 13 以後的版本可以透過 hostnamectl 一個指令完成這件事情，且不需要重新啟動系統。   Shell 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 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 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   例如，把主機名稱修改成 ubuntu-bionic-x64： hostnamectl set-hostname ubuntu-bionic-x64 1 hostnamectl set-hostname ubuntu-bionic-x64   這時候終端機還看不出變化，我們可以用 hostnamectl status 檢查有沒有修改成功： Shell root@ubuntu-1804x64:~# hostnamectl status Static hostname: ubuntu-bionic-x64 Icon name: computer-vm Chassis: vm Machine ID: 4d6eaab693a3412bbdba34d61ffb349f Boot ID: afb830841693441eb38129033ae2afbc Virtualization: kvm Operating System: Ubuntu 18.04 LTS Kernel: Linux 4.15.0-23-generic Architecture: x86-64 1 2 3 4 5 6 7 8 9 10 root@ubuntu-1804x64:~# hostnamectl status    Static hostname: ubuntu-bionic-x64          Icon name: computer-vm            Chassis: vm         Machine ID: 4d6eaab693a3412bbdba34d61ffb349f            Boot ID: afb830841693441eb38129033ae2afbc     Virtualization: kvm   Operating System: Ubuntu 18.04 LTS             Kernel: Linux 4.15.0-23-generic       Architecture: x86-64   檢查結果是有修改過的，登出後重新登入主機就可以看到終端機的主機名稱修改成功，完整過程如下圖。 References: hostname – How do I change the computer name? – Ask Ubuntu How do I change the hostname without a restart? – Ask Ubuntu [Ubuntu] 使用 hostnamectl 修改主機名稱 was last modified: 2018-06-26 by Calos