My CentOS VPS got many IP addresses that I'd like to add to the
eth0 network interface.
eth0 only got 1 IPv4 address and its other ones doesn't show up.
My searching gives me terms like IP Alias but that doesn't seem to apply to CentOS. The CentOS Wiki doesn't really show how it's done.
cp /etc/sysconfig/network-scripts/ifcfg-eth0 /etc/sysconfig/network-scripts/ifcfg-eth0:0
Now you can edit the new file ifcfg-eth0:0 and specify the network settings of the virtual interface.
How do I manually add IPv4 IP addresses to a physical network interface in CentOS 7?