After upgrading CloudStack packages, new system properties and settings may be introduced in the release. CloudStack will not overwrite or replace your existing configuration files. The latest configuration file are named with .rpmnew or .dpkg-dist extention depends on your package manager.
It is strongly recommended to review and apply these new changes manually by comparing them to your previously installed version.
The locations of the essential configuration properties files are as follows:
/etc/default/cloudstack-management /etc/default/cloudstack-usage /etc/cloudstack/management/db.properties /etc/cloudstack/management/config.json /etc/cloudstack/management/server.properties /etc/cloudstack/management/environment.properties /etc/cloudstack/management/java.security.ciphers