So I need to summarize some points that we need to achieve:
1) On clean VPS CentOS system, we need to parse the ifcfg-eth* files and add entries to db, one by one, in order not to lose our system after reboot.
2) If the interface has Bootproto dhcp, we need to parse this entry as well:
db networks setprop eth0 bootproto dhcp3) As far as on VPS we have only one ethernet adapter while setting up the Hostname and TZ we can choose VPS role, and this role will create an alias or virtual Green interface.
4) Despite one interface we can not to change green role, but we need to add restrictions to some services like MySQL, LDAP, etc.
Due to aforesaid, our primary aim does not lose connection to the server.