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I have installed Hadoop on following path:

/opt/hadoop

Also installed openssh-server with following commands:

sudo apt-get install openssh-server openssh-client

After this I created RSA keys with following commands:

ssh-keygen -t rsa -P ""

After that i copied to slave system and created copy using:

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
sudo chmod 0600 ~/.ssh/authorized_keys

Everything was working fine with Hadoop and SSH. Suddenly SSH asking for password each and every time I run

ssh hduser@MasterNode

or

/opt/hadoop/sbin/start-all.sh
David Foerster
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Girish Khole
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  • Try http://askubuntu.com/questions/46930/how-can-i-set-up-password-less-ssh-login – Katu Jan 12 '17 at 12:48
  • @Katu i tried all that steps while installing hadoop. the thing is i am using Ubuntu 16.10 version and after couple of restarts that key is not working for hadoop start-all.sh command. my question is how to solve this? – Girish Khole Jan 12 '17 at 13:00
  • I have never used hadoop. If you are saying that passwordless ssh works from the terminal but not from hadoop, I can't help. But make sure that when you ssh from the terminal you don't need the password and also that hadoop uses the same user that you do (the user that stores the private key) and not sudo or other. – Katu Jan 12 '17 at 13:19
  • Thank you @Katu for your help.. but i need the solution to use hadoop.. if anyone can help please tell me the solution.... – Girish Khole Jan 12 '17 at 13:31
  • Turn on verbose output for the ssh session handshake - perhaps you can from the output figure out what is going on ssh -vvv hduser@MasterNode – jhilmer Jan 12 '17 at 13:57
  • @jhilmer this is also not working, asking for password every time.. can it be related to operating system? i am using ubuntu 16.10... is it stable version? – Girish Khole Jan 13 '17 at 04:07
  • i think Ubuntu 16.10 is having that issue with ssh service. after downgrading the Ubuntu 16.10 to 16.04 LTS everything is working fine. does anyone having the solution to resolve ssh issue "while running hadoop ssh asking for password every time" for Ubuntu 16.10 – Girish Khole Jan 16 '17 at 04:33

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