1:- i have one AMIs
2:- with one IP address
3:- i have config postix mail server
4:- apache web server
5:- DNS (bind)
my question (may be very elementary sorry for my english) if you only one ip address for all these what can be issues may i get, on really time and because client is asking for such think
In very small environments I commonly run DNS, Apache, a mail daemon, and possibly more all on the same server. It's not the best idea, but frequently you have to make do with what you have. As long as the services don't run on the same port, you shouldn't run into any issues (except that a hacker compromising one service gets access to all the rest).