CentOS7

hostname mynewhostname

vi /etc/hostname

vi /etc/sysconfig/network
→HOSTNAME=mynewhostname

sudo systemctl restart systemd-hostnamed

Ubuntu

hostname mynewhostname

vi /etc/hostname

vi /etc/hosts
→127.0.1.1    mynewhostname

sudo systemctl restart systemd-logind.service

Alpine

hostname mynewhostname

vi /etc/hostname

vi /etc/hosts
→127.0.1.1    mynewhostname

sudo service hostname restart

验证主机名修改

hostname