https://community.cloudera.com/t5/Support-Questions/Re-Fail-to-start-HDFS-in-Cluster-Setup/m-p/65300#M55950 <P>I have the issue&nbsp;</P><P>&nbsp;</P><DIV class="description"><SPAN>Creating HDFS /tmp directory</SPAN></DIV><P>&nbsp;</P><PRE>Command (Create /tmp Directory (241)) has failed</PRE><P>&nbsp;</P><P>---------</P><PRE>Mon Mar 12 16:22:02 +03 2018 Current working directory: /run/cloudera-scm-agent/process/115-hdfs-NAMENODE-createtmp Launching one-off process: /usr/lib64/cmf/service/hdfs/hdfs.sh mkdir /tmp hdfs supergroup 1777 Mon Mar 12 16:22:02 +03 2018 JAVA_HOME=/usr/java/jdk1.7.0_67-cloudera using /usr/java/jdk1.7.0_67-cloudera as JAVA_HOME using 5 as CDH_VERSION using /run/cloudera-scm-agent/process/115-hdfs-NAMENODE-createtmp as CONF_DIR using as SECURE_USER using as SECURE_GROUP CONF_DIR=/run/cloudera-scm-agent/process/115-hdfs-NAMENODE-createtmp CMF_CONF_DIR=/etc/cloudera-scm-agent unlimited 2018-03-12 15:22:04 WARN NativeCodeLoader:62 - Unable to load native-hadoop library for your platform... using builtin-java classes where applicable Directory /tmp does not currently exist. 2018-03-12 15:22:04 WARN CreateHdfsDirUtil:377 - Connection failed 1 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:05 WARN CreateHdfsDirUtil:377 - Connection failed 2 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:06 WARN CreateHdfsDirUtil:377 - Connection failed 3 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:07 WARN CreateHdfsDirUtil:377 - Connection failed 4 time(s). Trying again... Directory /tmp does not currently exist. 2018-03-12 15:22:08 WARN CreateHdfsDirUtil:377 - Connection failed 5 time(s). Trying again... Directory /tmp does not currently exist.</PRE><P>-----</P><P>There is enough space but gives error:</P><TABLE><TBODY><TR><TD>2:33:51.723 PM</TD><TD>WARN</TD><TD>NameNodeResourceChecker</TD><TD><PRE>Space available on volume '/dev/mapper/centos_node1-root' is 0, which is below the configured reserved amount 104857600</PRE></TD></TR><TR><TD>2:33:51.723 PM</TD><TD>WARN</TD><TD>FSNamesystem</TD><TD><PRE>NameNode low on available disk space. Already in safe mode.</PRE></TD></TR><TR><TD>2:33:51.724 PM</TD><TD>INFO</TD><TD>StateChange</TD><TD><PRE>STATE* Safe mode is ONResources are low on NN. Please add or free up more resources then turn off safe mode manually. NOTE: If you turn off safe mode before adding resources, the NN will immediately return to safe mode. Use "hdfs dfsadmin -safemode leave" to turn safe mode off.</PRE></TD></TR><TR><TD>2:33:53.138 PM</TD><TD>WARN</TD><TD>UserGroupInformation</TD><TD><PRE>PriviledgedActionException as:hdfs (auth:SIMPLE) cause:org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /tmp/.cloudera_health_monitoring_canary_files. Name node is in safe mode. Resources are low on NN. Please add or free up more resources then turn off safe mode manually. NOTE: If you turn off safe mode before adding resources, the NN will immediately return to safe mode. Use "hdfs dfsadmin -safemode leave" to turn safe mode off.</PRE></TD></TR><TR><TD>2:33:53.139 PM</TD><TD>INFO</TD><TD>Server</TD><TD><PRE>IPC Server handler 8 on 8020, call org.apache.hadoop.hdfs.protocol.ClientProtocol.mkdirs from 10.0.0.1:52192 Call#447 Retry#0: org.apache.hadoop.hdfs.server.namenode.SafeModeException: Cannot create directory /tmp/.cloudera_health_monitoring_canary_files. Name node is in safe mode. Resources are low on NN. Please add or free up more resources then turn off safe mode manually. NOTE: If you turn off safe mode before adding resources, the NN will immediately return to safe mode. Use "hdfs dfsadmin -safemode leave" to turn safe mode off.</PRE></TD></TR></TBODY></TABLE> Fri, 16 Sep 2022 12:57:41 GMT Michael 2022-09-16T12:57:41Z