Can we run multiple hybris instances in one machine if yes then how?

Yes we can run as many hybris we want, till our machine memory permits. Hybris runs on a tomcat instance and is shipped with a bundled tomcat. 

To do so, we need to make each instance of tomcat to have its own ports to use. Make below ports unique for each instance. 

We should add below properties in the local property file of each instance with unique values.

tomcat.http.port=6001 

tomcat.ssl.port=6002 

tomcat.ajp.port=6009 

tomcat.jmx.port=6003 

tomcat.jmx.server.port=6004