Do shiny server need to be installed as I aready installed Rstudioserver on my linux cent OS 6 server for publishing shiny app on my own server ?

This is a very different question, please ask it on a new topic including a minimal REPRoducible EXample (reprex). A reprex makes it much easier for others to understand your issue and figure out how to help.

If you've never heard of a reprex before, you might want to start by reading this FAQ: