Linux修改hostname的常用操作方法是——手工在/etc/sysconfig/network中追加"HOSTNAME=xxxxx"并重启系统，这个方法在Oracle Linux 7中是不生效的。
那么在Oracle Linux 7中怎么配置hostname？
来源于：
How to Configure hostname in Oracle Linux 7 (Doc ID 2049221.1)
解决方案：
请使用如下三种方法的任意一种来修改Oracle Linux 7中的主机名
1. use hostname control utility: hsotnamectl
2. use NetworkManager command line tool: nmcli
3. edit /etc/hostname file directly (a reboot afterwards is required)
1. Use hsotnamectl which is a command-line client to systemd-hostnamed service
Get current hostname status:
[root@localhost ~]# hostnamectl status
Static hostname: localhost.localdomain
Operating System: Oracle Linux Server 7.1
CPE OS Name: cpe:/o:oracle:linux:7:1
Kernel: Linux 3.8.13-55.1.6.el7uek.x86_64
Architecture: x86_64
Set hostname:
[root@localhost ~]# hostnamectl set-hostname oraclelinux.oracle.com
[root@localhost ~]#
Re-login terminal session:
[root@oraclelinux ~]# hostnamectl status
Static hostname: oraclelinux.oracle.com
Operating System: Oracle Linux Server 7.1
CPE OS Name: cpe:/o:oracle:linux:7:1
Kernel: Linux 3.8.13-55.1.6.el7uek.x86_64
Architecture: x86_64
2. nmcli
Check current hostname:
[root@localhost ~]# nmcli general hostname
localhost.localdomain
Modify hostname and restart ystemd-hostnamed service:
[root@localhost ~]# nmcli general hostname oraclelinux.oracle.com
[root@localhost ~]# systemctl restart systemd-hostnamed
Re-login terminal session:
[root@oraclelinux ~]# hostname
oraclelinux.oracle.com
3. Edit /etc/hostname
View current content:
[root@localhost ~]# cat /etc/hostname
localhost.localdomain
Replace file content with new hostname:
[root@localhost ~]# echo "oraclelinux.oracle.com" > /etc/hostname
[root@localhost ~]# cat /etc/hostname
oraclelinux.oracle.com
Restart system and verify:
[root@oraclelinux ~]# hostname
oraclelinux.oracle.com
