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My question: What other security concerns should I be aware of? It seems to me all the other ports/programs would be blocked or inaccessible from the outside net? Any other concerns I should be aware of or blocks I should have in place?
Thanks for suggestions and input!
Configure the firewall (iptables) on the web server to block everything except port 80.
Turn off all the services on the server that you don't need. For example, if you're not using MySQL then make sure it's not running.
Make sure you check for system security updates regularly and install them (to catch bugs in either apache or php or other components). This can be automated.
If you are running any additional web software packages, make sure you sign up for security alerts for them and update them as necessary.