From the bin directory in step 10, execute the following command:

$ cd ../sbin
$ ./hadoop-daemon.sh start namenode

Upon successful execution of the preceding command, you should see the following on your terminal:

starting namenode, logging to /opt/yarn/hadoop-2.7.3/logs/hadoop-hdfs-namenode-limulus.out

To start the secondarynamenode and the datanode, you should use the following command:

$ ./hadoop-daemon.sh start secondarynamenode

You should receive the following message on your terminal if the preceding commands succeed:

Starting secondarynamenode, logging to /opt/yarn/hadoop-2.7.3/logs/hadoop-hdfs-secondarynamenode-limulus.out

Then use the following command to start the data node:

$ ./hadoop-daemon.sh start datanode

You should receive the following message on your terminal if the preceding commands succeed:

starting datanode, logging to /opt/yarn/hadoop-2.7.3/logs/hadoop-hdfs-datanode-limulus.out

Now make sure that, you check all the services related to those nodes are running use the following command:

$ jps

You should observe something like the following:

35180 SecondaryNameNode
45915 NameNode
656335 Jps
75814 DataNode