export JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-8.b10.el7_5.x86_64
export HADOOP_CONF_DIR=/etc/hadoop/conf
export HADOOP_LOG_DIR=/var/log/hadoop
/opt/hadoop-2.9.1/sbin/yarn-daemon.sh --config $HADOOP_CONF_DIR start ${1}