Service Catalog uses Tomcat Apache for clustering . You need to “configure” catalog to use the underline tomcat to do clustering work accordingly .
In 17.1 , both Tomcat and Java versions are updated to use tomcat 8 and Java 8 . Comparing to the old tomcat version , very small changes relating to cluster section in server.xml need to be paid attention to. .
set up service catalog clustering nodes in 17.1