Hadoop: require root's password after enter "start-all.sh"

Solution:

1) Generate ssh key without password

$ ssh-keygen -t rsa -P ""

2) Copy id_rsa.pub to authorized-keys

$  cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys

3) Start ssh localhost

$ ssh localhost

4) now go to the hadoop sbin directory and start hadoop

$./start-all.sh ./start-all.shThis script is Deprecated. Instead use start-dfs.sh and start-yarn.shStarting namenodes on [localhost]localhost: starting namenode, logging to /home/amtex/Documents/installed/hadoop/logs/hadoop-amtex-namenode-amtex-desktop.outlocalhost: starting datanode, logging to /home/amtex/Documents/installed/hadoop/logs/hadoop-amtex-datanode-amtex-desktop.outStarting secondary namenodes [0.0.0.0]0.0.0.0: starting secondarynamenode, logging to /home/amtex/Documents/installed/hadoop/logs/hadoop-amtex-secondarynamenode-amtex-desktop.outstarting yarn daemonsstarting resourcemanager, logging to /home/amtex/Documents/installed/hadoop/logs/yarn-amtex-resourcemanager-amtex-desktop.outlocalhost: starting nodemanager, logging to /home/amtex/Documents/installed/hadoop/logs/yarn-amtex-nodemanager-amtex-desktop.out

5)password not asking

$ jps 12373 Jps11823 SecondaryNameNode11643 DataNode12278 NodeManager11974 ResourceManager11499 NameNode

As in above case munichong is a user (munichong@GrindPad)

1. In my case: Login as hduser

2. Firstly, remove the directorysudo rm -rf ~/.ssh

3. Use to re-generate /.ssh directory with default setting:

   [hduser@localhost ~]$ ssh-keygen

4. Here we do copy and paste the content of id_rsa.pub into authorised_keys file created by using above command)

   [hduser@localhost ~]$ sudo cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

5. [hduser@localhost ~]$ chmod -R 750 ~/.ssh/authorized_keys

6. [hduser@localhost ~]$ ssh localhost

   The authenticity of host 'localhost (127.0.0.1)' can't be established. RSA key fingerprint is 04:e8:80:64:dc:71:b5:2f:c0:d9:28:86:1f:61:60:8a. Are you sure you want to continue connecting (yes/no)? yes

   Warning: Permanently added 'localhost' (RSA) to the list of known hosts. Last login: Mon Jan 4 14:31:05 2016 from localhost.localdomain

7. [hduser@localhost ~]$ jps
   18531 Jps

8. [hduser@localhost ~]$ start-all.sh

9. All daemons start

Note: Sometime due to logs files other problem occur, in that case remove only dot out (.out) files from /usr/local/hadoop/logs/.

I ran into the same problem. As Amar said,if you are running as sudo hadoop will ask for root password. If you don't have a root password, you can setup one using

 sudo passwd

below URL gives you more detail about user management.

https://help.ubuntu.com/12.04/serverguide/user-management.html