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On a CentOS server we own, we had to disable eth0 from starting at boot time
To do so we needed to modify the file /etc/sysconfig/network-scripts/ifcfg-eth0 and set the value ONBOOT="yes" to ONBOOT="no".
Using you favorite text editor, make this change and restart your machine to verify that the change was successful.
Below is the sample content of /etc/sysconfig/network-scripts/ifcfg-eth0 after the change was applied to prevent eth0 from starting at boot time.
GNU nano 2.3.1 File: /etc/sysconfig/network-scripts/ifcfg-eth0 Modified TYPE="Ethernet" BOOTPROTO=dhcp DEFROUTE="yes" IPV4_FAILURE_FATAL="no" IPV6INIT="yes" IPV6_AUTOCONF="yes" IPV6_DEFROUTE="yes" IPV6_FAILURE_FATAL="no" NAME="eth0" UUID="792d6842-221d-5c99-ba98-cddbba4ff263" ONBOOT="no" HWADDR="00:AA:5D:01:22:2B" DNS1="10.15.10.5" DOMAIN="bytefreaks.local" IPADDR=10.15.10.249 PREFIX=24 GATEWAY=10.15.10.1 PEERDNS=yes PEERROUTES=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes