Question

i am using redhat linux 4.1.2 When i try to start hadoop using the below command it asks for root@localhost password. I don’t understand what password to enter here.

sreenath@sreenath-pc# sudo -i [root@sreenath-pc hadoop-1.1.1]#
bin/start-all.sh Warning: $HADOOP_HOME is deprecated.

starting namenode, logging to
/opt/hadoop-1.1.1/libexec/../logs/hadoop-root-namenode-sreenath-pc
.out root@localhost’s password: root@localhost’s password: localhost:
Permission denied, please try again.

[1]+ Stopped bin/start-all.sh

I have given the current user “sreenath” password

Answer 1

Your SSH isn’t setup properly

Setup passphraseless ssh

Now check that you can ssh to the localhost without a passphrase:

$ ssh localhost

If you cannot ssh to localhost without a passphrase, execute the
following commands:

$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

Execution

Format a new distributed-filesystem:

$ bin/hadoop namenode -format

Start The hadoop daemons:

$ bin/start-all.sh

http://hadoop.apache.org/common/docs/r0.17.0/quickstart.html#Setup+passphraseless

or

Refer Micheal Noll’s link for running Hadoop on your machine.