Check current hostname with the hostname command.
hostname
Change hostname with hostnamectl
hostnamectl set-hostname newhostname
Example:
Changing hostname from “localhost” to “newhost”.
[root@localhost ~]# hostname localhost [root@localhost ~]# hostnamectl set-hostname newhost [root@localhost ~]# hostname newhost [root@localhost ~]#
Open up the following file with your favorite text editor. Change eth0 to the interface you need, like “wlan0” or “eth1”.
vi /etc/sysconfig/network-scripts/ifcfg-eth0
The file should look something like the following.
DEVICE=eth0 HWADDR=0A:2G:F3:56:66:4B TYPE=Ethernet UUID=aeh9421c-6a62-712c-886d-347813g8d1dh ONBOOT=no NM_CONTROLLED=yes BOOTPROTO=dhcp
To set the static IP address change “BOOTPROTO=dhcp” to “BOOTPROTO=static” and add the following to the end of the file. If you want/need the interface to come up when the computer boots up then be sure to change “ONBOOT=no” to “ONBOOT=yes”.
BROADCAST=192.168.1.255 DNS1=8.8.8.8 GATEWAY=192.168.1.1 IPADDR=192.168.1.110 NETMASK=255.255.255.0
Also, on some newer versions of CentOS you may need to add NM_DISABLED=no
So your file should now look like this.
DEVICE=eth0 HWADDR=0A:2G:F3:56:66:4B TYPE=Ethernet UUID=aeh9421c-6a62-712c-886d-347813g8d1dh ONBOOT=yes NM_CONTROLLED=no BOOTPROTO=static BROADCAST=192.168.1.255 DNS1=8.8.8.8 GATEWAY=192.168.1.1 IPADDR=192.168.1.110 NETMASK=255.255.255.0
Save the file and restart networking.
service network restart
Finally, check you IP address with ifconfig.
root@localhost ~]# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 0A:2G:F3:56:66:4B
inet addr:192.168.1.110 Bcast:192.168.1.255 Mask:255.255.255.0