3. Start YARN

Execute these commands from the ResourceManager server:

<login as $YARN_USER and source the directories.sh companion script>
/usr/lib/hadoop-yarn/sbin/yarn-daemon.sh --config $HADOOP_CONF_DIR start resourcemanager

Execute these commands from all NodeManager nodes:

<login as $YARN_USER and source the directories.sh companion script>
/usr/lib/hadoop-yarn/sbin/yarn-daemon.sh --config $HADOOP_CONF_DIR start nodemanager

hadoop fs -mkdir /app-logs
hadoop fs -chown $YARN_USER /app-logs
hadoop fs -chmod 1777 /app-logs

where:

$YARN_USER is the user owning the YARN services. For example, yarn.
$HADOOP_CONF_DIR is the directory for storing the Hadoop configuration files. For example, /etc/hadoop/conf.

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