Thank you for your interest. As you mentioned, our stacks runs independently of the software in the machine, that means that they include all the packages and dependencies they need to run. If you install the Apache and PHP packages in the system using apt, you will have 2 apache servers and 2 PHP binaries in the machine. For example, you can run
which -a php to obtain the PHP binaries in the PATH.
Bitnami's Apache's ports are the 80 and 443 ones by default and the system's one also uses those ones. You will need to change the default ports in one of the servers to run both at the same time.
Let us know if you have any questions.
Happy to help!
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