Change Hostname in CentOS 6.5/7

CentOS 6.5

[1] Change hostname with a commnad (but if rebooting, it will be back).

[root@vpsmate ~]# hostname              # show current hostname
srv1.vpsmate.net
[root@vpsmate ~]# hostname srv2.vpsmate.net         # change hostname
[root@vpsmate ~]# hostname
srv2.vpsmate.net
[2] Change hostname permanently.

[root@vpsmate ~]# vi /etc/sysconfig/network     # change
HOSTNAME=srv2.vpsmate.net
[root@vpsmate ~]# exit
CentOS release 6.5
Kernel xxx
srv2.vpsmate.net login:                 # changed

CentOS 7

[1]Change hostname with a commnad (but if rebooting, it will be back).

[root@vpsmate ~]# hostname                  # show current hostname
srv1.vpsmate.net
[root@vpsmate ~]# hostname srv2.vpsmate.net         # change hostname
[root@vpsmate ~]# hostname
srv2.vpsmate.net
[2] Change hostname permanently.

view source
[root@vpsmate ~]# vi /etc/hostname          # change
srv1.vpsmate.net
[root@vpsmate ~]# exit
CentOS Linux 7
Kernel 3.10.0-123.4.2.el7.x86_64 on an x86_64
srv1 login:                         # just changed
 

CentOS 多网卡配置
1：添加一块或多块网卡     
2：cd /etc/udev/rules.d/
3：cat 70-persistent-net.rules  #查看网卡的名称 NAME="eth1"，并记录MAC等信息。
4：cd /etc/sysconfig/network-scripts
5：cp ifcfg-eth0 ifcfg-eth1
6：vi ifcfg-eth1
7：修改DEVICE=eth0 ，修改HWADDR
8：nmcli con  查看网卡UUID，并修改原来的，或者注释掉UUID  （#UUID）
9：reboot


CentOS 网卡重命名
eth0 rename4

1：cd /etc/sysconfig/network-scripts
2：vi ifcfg-eth1
3：修改DEVICE=eth1
4：cd /etc/udev/rules.d/
5：70-persistent-net.rules  #存储网卡标识
6：vi 70-persistent-net.rules  #编辑
7：reboot

Ignore、Ignore all、Re-initialize、Re-initialize all