Manual Network Configuration on CentOS 7
On CentOS 7, the network interface name can vary depending on the environment (bare-metal, cloud, virtualized). Before configuring the network manually, identify the active interface using the following command:
ip addr
1. Interface configuration file
Edit or create the file for your network interface:
/etc/sysconfig/network-scripts/ifcfg-[interface_name]
For example, if your interface is named eth0, the file should be ifcfg-eth0.
Recommended content:
DEVICE=[interface_name] BOOTPROTO=none ONBOOT=yes USERCTL=no IPV6INIT=no PEERDNS=yes TYPE=Ethernet NETMASK=255.255.255.255 IPADDR=[ASSIGNED_IP] GATEWAY=[ASSIGNED_GATEWAY] ARP=yes HWADDR=[MAC_ADDRESS]
Replace the values in brackets with the actual information provided by your hosting provider or network configuration.
2. Routing file configuration
If the file doesn't exist, create it using this path:
/etc/sysconfig/network-scripts/route-[interface_name]
Recommended content:
[ASSIGNED_GATEWAY] 255.255.255.255 [interface_name] [NETWORK_GW_VM] 255.255.255.0 [interface_name] default [ASSIGNED_GATEWAY]
Note: NETWORK_GW_VM refers to the main IP of your server with the last octet replaced by 0.
3. DNS configuration
Edit the file:
/etc/resolv.conf
Recommended content:
nameserver 213.186.33.99
