I've setup a complete new server again.
Source server = Google Cloud VM, Debian
New Server = Self hosted VM, Centos
I followed the instructions here https://docs.bitnami.com/google/apps/exo-platform-community/
After completing the steps, I start the server with "/opt/bitnami/ctlscript.sh start"
I get the following errors :-
[exo@mybook1 bitnami]$ sudo ./ctlscript.sh start
su: user postgres does not exist
/opt/bitnami/postgresql/scripts/ctl.sh : postgresql could not be started
su: user tomcat does not exist
/opt/bitnami/apache-tomcat/scripts/ctl.sh : tomcat could not be started
/opt/bitnami/apache2/scripts/ctl.sh : httpd started at port 80
would manually creating the users "postgres" & "tomcat" solve the problem?