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ATMathew
Asked: 2011-04-16 13:45:59 +0800 CST

Can't ssh into a hadoop node

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All right folks, I have another very basic question. Please bear with me.

I'm following the instructions at the following website to download and configure Hadoop on my computer.

http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-single-node-cluster/

I'm at the final SSH section, when I use the localhost command. When I run the following code, I get an error message.

hadoop@amathew-Dimension-3000:~$ cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys
hadoop@amathew-Dimension-3000:~$ ssh localhost
ssh: connect to host localhost port 22: Connection refused

Here's some other information which might be relevant.

hadoop@amathew-Dimension-3000:~$ ssh -vvv localhost
OpenSSH_5.5p1 Debian-4ubuntu5, OpenSSL 0.9.8o 01 Jun 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to localhost [::1] port 22.
debug1: connect to address ::1 port 22: Connection refused
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: connect to address 127.0.0.1 port 22: Connection refused
ssh: connect to host localhost port 22: Connection refused

Can anyone help?

Once again, thanks for helping the newbie who just can't figure things out yet.

10.10

1 Answers

  1. Best Answer

    It seems to me that your SSH process is not running. Therefore there is no software which accepts connections on that port. You can check it by:

    sudo service ssh status

    or

    sudo /etc/init.d/ssh status

    The script should output something like ssh start/running, process 1234 if SSH is running. If not, you'll see ssh stop/waiting. I suspect you'll get the last message. If this is the case, you just should start your SSH daemon by:

    sudo service ssh start

    Furthermore you should have a look in you sshd_config and in /etc/default/ssh if there are some "strange" options.

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