After you have started the Hadoop Daemons by using the command bin/start-all.sh, you can open and check NameNode and JobTracker in browser.
By default they are available at below address.
The web interface for these services provide information and status of each of these components. They are first entry point to obtain a view of the state of a Hadoop cluster.
NameNode Web Interface:
The NameNode web interface can be accessed via the URL http://<host>:50070/
In this case, http://localhost:50070/
- The first section of the web page displays the name of the server running the NameNode which is 127.0.0.1 and the port 9100, when it was started, version information.
- In the Next section you see Cluster Summary which represent a high view of the state of the cluster.
files and directories, blocks: Each Filesystem metadata item consumes this much memory.
Configured Capacity: It represents total capacity of HDFS.
DFS Used: It represent space used in HDFS.
Non DFS Used: It tells about the space used for non-HDFS items like any other application running on system.
JobTracker Web Interface:
The JobTracker web interface can be accessed via the URL http://<namenode_host>:50030/
In this case, http://localhost:50030/