Set static IP to a Linux System:

Check for the config file and set it according to the following configuration:

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1
DEVICE="eth1"          ------------> Ethernet Port address seen on "Ifconfig".
BOOTPROTO="static"     ------------> "Static" IP or "dhcp".
IPV6INIT="yes"
NM_CONTROLLED="yes"
ONBOOT="yes"           ---------> Set on boooting.
TYPE="Ethernet"        -----------> Port type.
IPADDR=192.168.1.147   -----------> IP address.
NETMASK=255.255.255.0  -----------> Network Mask.
[root@localhost ~]#

Restart "network" service to see if the configuration is working.

You can verify it using the following command after the network restart:
# ifconfig eth1
# route -n