How to check if Hadoop daemons are running?

Question

What are simple commands to check if Hadoop daemons are running?

For example if I\'m trying to figure out why HDFS is not setup correctly I\'ll want to know a way to ch

Answer 1

you can use Jps command as vipin said like this command :

/usr/lib/java/jdk1.8.0_25/bin/jps  

of course you will change the path of java with the one you have "the path you installed java in"
Jps is A nifty tool for checking whether the expected Hadoop processes are running (part of Sun’s Java since v1.5.0).
the result will be something like that :

2287 TaskTracker  
2149 JobTracker  
1938 DataNode  
2085 SecondaryNameNode  
2349 Jps  
1788 NameNode  

I get the answer from this tutorial: http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/