${SOLR_ROOT}/bin/solr status
Here's the output of running this command on my localhost where I have 2 Solr instances and 3 ZooKeeper instances.
The Solr instances are running on the same host, using the same Solr binary distribution.

Found 2 Solr nodes: Solr process 9152 running on port 8983 { "solr_home":"/opt/solr/solr1", "version":"7.6.0", "startTime":"2016-07-02T22:42:00.720Z", "uptime":"0 days, 0 hours, 28 minutes, 2 seconds", "memory":"55.5 MB (%11.3) of 490.7 MB", "cloud":{ "ZooKeeper":"localhost:2181,localhost:2182,localhost:2183/solr", "liveNodes":"2", "collections":"1" } } Solr process 9330 running on port 8984 { "solr_home":"/opt/solr/solr2", "version":"7.6.0", "startTime":"2016-07-02T22:42:40.192Z", "uptime":"0 days, 0 hours, 27 minutes, 23 seconds", "memory":"39.1 MB (%8) of 490.7 MB", "cloud":{ "ZooKeeper":"localhost:2181,localhost:2182,localhost:2183/solr", "liveNodes":"2", "collections":"1" } }