If you are getting errors like   [root@us network-scripts]# ifup venet0 Error: no device found for connection ‘System venet0’. [root@us network-scripts]# ifup venet0:0 Error: no device found for connection ‘System venet0:0’.   On a centos7 and openvz machine, stop network manager.   [root@us network-scripts]# service NetworkManager stop Redirecting to /bin/systemctl stop NetworkManager.service [root@us network-scripts]# chkconfig … Continue reading Openvz / CentOS 7 – Network Manager can break networking