A common cause for this is the Hadoop service isn't running.   To start hadoop services in cloudera quickstart VM, you can use below commands: sudo service hadoop-hdfs-datanode start sudo service hadoop-hdfs-journalnode start sudo service hadoop-hdfs-namenode start sudo service hadoop-hdfs-secondarynamenode start sudo service hadoop-httpfs start   sudo service hadoop-yarn-nodemanager start sudo service hadoop-yarn-resourcemanager start sudo service hadoop-mapreduce-historyserver start   and then try your hadoop commands. Hope it will work. for more details visit https://wiki.apache.org/hadoop/ConnectionRefused ... View more