${SOLR_ROOT}/bin/solr healthcheck -help Usage: solr healthcheck [-c collection] [-z zkHost] [-V] -c collection Collection to run healthcheck against. -z zkHost ZooKeeper connection string; default is localhost:9983 -V Enables more verbose output.

${SOLR_ROOT}/bin/solr healthcheck -c collection1 -z "localhost:2181,localhost:2182,localhost:2183/solr"
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.

localhost:2181,localhost:2182,localhost:2183/solr { "collection":"collection1", "status":"healthy", "numDocs":0, "numShards":2, "shards":[ { "shard":"shard1", "status":"healthy", "replicas":[ { "name":"core_node2", "url":"http://127.0.1.1:8983/solr/collection1_shard1_replica2/", "numDocs":0, "status":"active", "uptime":"0 days, 0 hours, 30 minutes, 53 seconds", "memory":"59.3 MB (%12.1) of 490.7 MB" }, { "name":"core_node4", "url":"http://127.0.1.1:8984/solr/collection1_shard1_replica1/", "numDocs":0, "status":"active", "uptime":"0 days, 0 hours, 30 minutes, 14 seconds", "memory":"42.8 MB (%8.7) of 490.7 MB", "leader":true } ] }, { "shard":"shard2", "status":"healthy", "replicas":[ { "name":"core_node1", "url":"http://127.0.1.1:8983/solr/collection1_shard2_replica2/", "numDocs":0, "status":"active", "uptime":"0 days, 0 hours, 30 minutes, 53 seconds", "memory":"59.4 MB (%12.1) of 490.7 MB" }, { "name":"core_node3", "url":"http://127.0.1.1:8984/solr/collection1_shard2_replica1/", "numDocs":0, "status":"active", "uptime":"0 days, 0 hours, 30 minutes, 14 seconds", "memory":"42.8 MB (%8.7) of 490.7 MB", "leader":true } ] } ] }