Is there a command, similar to
/opt/solr/bin/solr version that will tell you whether Solr is running in SolrCloud or Standalone mode?
I am running Solr 7.2.1 on Centos7
The current system state is available at the REST endpoint /solr/admin/info/system. You're looking for the mode entry, which will be solrcloud in cluster mode and std in regular, non-cloud mode.