Getting error ...while i was going to start the Tranquility server process

while i was going to start the Tranquility server process, which can be used to push events directly to Druid

using $bin/tranquility server -configFile /home/sys1010/druid-0.10.1/conf-quickstart/tranquility/server.json

at org.apache.zookeeper.ClientCnxn$ ~[org.apache.zookeeper.zookeeper-3.4.6.jar:3.4.6-1569965]

2017-10-06 07:23:32,663 [qtp833420622-20-SendThread(localhost:2181)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server localhost/ Will not attempt to authenticate using SASL (unknown error)

2017-10-06 07:23:32,664 [qtp833420622-20-SendThread(localhost:2181)] WARN org.apache.zookeeper.ClientCnxn - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect Connection refused

at Method) ~[na:1.8.0_131]

at ~[na:1.8.0_131]

at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport( ~[org.apache.zookeeper.zookeeper-3.4.6.jar:3.4.6-1569965]

at org.apache.zookeeper.ClientCnxn$ ~[org.apache.zookeeper.zookeeper-3.4.6.jar:3.4.6-1569965]

Is there a zookeeper instance running and listening on the loopback interface on port 2181? If you list open tcp ports you can verify your zookeeper port ss -tln