Hi,   I'm trying to install  a single node cluster with the cloudera manager installer.   Everything goes smoothly until Cluster Setup fails at the "Start HDFS" step with the error "Failed to format NameNode".   On the same screen when clicking the "Full log file" link I get a popup with : No such file or directory: '/var/log/hadoop-hdfs/hadoop-cmf-hdfs-NAMENODE-myhost.log.out'   I checked the dfs.namenode.name.dir property, it has two values "/data/dfs/nn" and "/soft/dfs/nn", both of these directories seem to have suficient permissions:   # ll /data/dfs drwx------ 2 hdfs hadoop 4096 Jan 12 10:57 nn # ll /soft/dfs drwx------ 3 hdfs hadoop 4096 Jan 11 16:14 dn drwx------ 3 hdfs hadoop 4096 Jan 11 16:14 nn   I also checked the log directory permissions (for the popup error message), they are as follows:   # ll /var/log drwxrwxr-x 4 hdfs hadoop 4096 Jan 12 11:11 hadoop-hdfs   Here are logs I got in cloudera-scm-agent.log when hitting the Retry button : [12/Jan/2016 11:26:08 +0000] 62644 MainThread agent INFO Deleting process 19-hdfs-NAMENODE-format [12/Jan/2016 11:26:08 +0000] 62644 MainThread agent INFO Triggering supervisord update. [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Retiring process 19-hdfs-NAMENODE-format [12/Jan/2016 11:26:09 +0000] 62644 MainThread util INFO Using specific audit plugin for process hdfs-NAMENODE-format [12/Jan/2016 11:26:09 +0000] 62644 MainThread util INFO Creating metadata plugin for process hdfs-NAMENODE-format [12/Jan/2016 11:26:09 +0000] 62644 MainThread util INFO Using specific metadata plugin for process hdfs-NAMENODE-format [12/Jan/2016 11:26:09 +0000] 62644 MainThread util INFO Using generic metadata plugin for process hdfs-NAMENODE-format [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent WARNING Not creating a monitor for 20-hdfs-NAMENODE-format: MonitorDaemon not created yet [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO First time to activate the process [20-hdfs-NAMENODE-format]. [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Created /var/run/cloudera-scm-agent/process/20-hdfs-NAMENODE-format [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Chowning /var/run/cloudera-scm-agent/process/20-hdfs-NAMENODE-format to hdfs (453) hdfs (171) [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Chmod'ing /var/run/cloudera-scm-agent/process/20-hdfs-NAMENODE-format to 0751 [12/Jan/2016 11:26:09 +0000] 62644 MainThread parcel INFO prepare_environment begin: {u'CDH': u'5.5.1-1.cdh5.5.1.p0.11'}, [u'cdh'], [u'cdh-plugin', u'hdfs-plugin'] [12/Jan/2016 11:26:09 +0000] 62644 MainThread parcel INFO The following requested parcels are not available: {} [12/Jan/2016 11:26:09 +0000] 62644 MainThread parcel INFO Obtained tags ['cdh', 'impala', 'sentry', 'solr', 'spark'] for parcel CDH [12/Jan/2016 11:26:09 +0000] 62644 MainThread parcel INFO prepare_environment end: {'CDH': '5.5.1-1.cdh5.5.1.p0.11'} [12/Jan/2016 11:26:09 +0000] 62644 MainThread util INFO Extracted 20 files and 0 dirs to /var/run/cloudera-scm-agent/process/20-hdfs-NAMENODE-format. [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Created /var/run/cloudera-scm-agent/process/20-hdfs-NAMENODE-format/logs [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Chowning /var/run/cloudera-scm-agent/process/20-hdfs-NAMENODE-format/logs to hdfs (453) hdfs (171) [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Chmod'ing /var/run/cloudera-scm-agent/process/20-hdfs-NAMENODE-format/logs to 0751 [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO reading limits: {u'limit_memlock': None, u'limit_fds': None} [12/Jan/2016 11:26:09 +0000] 62644 MainThread agent INFO Triggering supervisord update. [12/Jan/2016 11:26:09 +0000] 62644 MainThread navigator_plugin INFO Scheduling a refresh for Audit Plugin for hdfs-NAMENODE-format with pipelines [NavigatorLog4jAppender,HdfsAuditLogger] [12/Jan/2016 11:26:09 +0000] 62644 MainThread navigator_plugin INFO Scheduling a refresh for Metadata Plugin for hdfs-NAMENODE-format with pipelines [] [12/Jan/2016 11:26:09 +0000] 62644 Audit-Plugin navigator_plugin INFO Refreshing Audit Plugin for hdfs-NAMENODE-format with pipelines [NavigatorLog4jAppender,HdfsAuditLogger] [12/Jan/2016 11:26:09 +0000] 62644 Audit-Plugin navigator_plugin_pipeline INFO Stopping Navigator Plugin Pipeline 'NavigatorLog4jAppender' for hdfs-NAMENODE-format (log dir: None) [12/Jan/2016 11:26:09 +0000] 62644 Audit-Plugin navigator_plugin_pipeline INFO Stopping Navigator Plugin Pipeline 'HdfsAuditLogger' for hdfs-NAMENODE-format (log dir: None) [12/Jan/2016 11:26:09 +0000] 62644 Metadata-Plugin navigator_plugin INFO Refreshing Metadata Plugin for hdfs-NAMENODE-format with pipelines [] [12/Jan/2016 11:26:09 +0000] 62644 Metadata-Plugin navigator_plugin_pipeline INFO Stopping Navigator Plugin Pipeline '' for hdfs-NAMENODE-format (log dir: None) [12/Jan/2016 11:26:14 +0000] 62644 MainThread agent INFO PID '65336' associated with process '20-hdfs-NAMENODE-format' with payload 'processname:20-hdfs-NAMENODE-format groupname:20-hdfs-NAMENODE-format from_state:RUNNING expected:0 pid:65336' exited unexpectedly [12/Jan/2016 11:26:14 +0000] 62644 MainThread agent WARNING Process exited event for process '20-hdfs-NAMENODE-format' does not have a monitor to handle event - the event will be ignored.   At this point I would be very grateful if someone could point me in the right direction.   Thanks ... 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