Linux修改hostname的常用操作方法是——手工在/etc/sysconfig/network中追加"HOSTNAME=xxxxx"並重啟系統，這個方法在Oracle Linux 7中是不生效的。
那麼在Oracle Linux 7中怎麼配置hostname？
來源於：
How to Configure hostname in Oracle Linux 7 (Doc ID 2049221.1)

解決方案：
請使用如下三種方法的任意一種來修改Oracle Linux 7中的主機名
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

Oracle Linux 7 修改 hostname

1. Use hsotnamectl which is a command-line client to systemd-hostnamed service

2. nmcli

3. Edit /etc/hostname

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