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From "Kartashov, Andy" <Andy.Kartas...@mpac.ca>
Subject RE: ERROR:: SSH failour for distributed node hadoop cluster
Date Thu, 25 Oct 2012 17:37:03 GMT
Yoges,

If you are asked for a password you PSSWDLSS SSH is not working.

Shoot, forgot one detail. Please rememeber to set file authorized_keys to 600 permission.
:)


From: yogesh dhari [mailto:yogeshdhari@live.com]
Sent: Thursday, October 25, 2012 1:14 PM
To: hadoop helpforoum
Subject: RE: ERROR:: SSH failour for distributed node hadoop cluster

Thanks Andy,

I got your point :-),

What I have done earlier..

I have configured
1) One as a Master ( plays role of both Name node and Data Node)
2) Second as a Slave ( Only date node)

I have give same name to both Machines and they have Admin access. pluto ( for both Master
and Slave).

and generated ssh key pair through this way

Master:~ mediaadmin$ ssh-keygen -t rsa -P " "
Generating public/private rsa key pair.
Enter file in which to save the key (/Users/mediaadmin/.ssh/id_rsa):
/Users/mediaadmin/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Your identification has been saved in /Users/mediaadmin/.ssh/id_rsa.
Your public key has been saved in /Users/mediaadmin/.ssh/id_rsa.pub.
The key fingerprint is:
32:0f:be:7a:ea:44:a1:4a:b6:b1:85:3f:1f:56:48:4b mediaadmin@Master
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|                 |
|    .E           |
|  ..o.o          |
| =...o+.S        |
|o.*. ..=         |
|.o o.o. .        |
|   .+ o.         |
|   .+=.          |
+-----------------+

Copy to home
Master:~ mediaadmin$ cat $HOME/.ssh/id_rsa.pub >> $HOME/.ssh/authorized_keys


and copy to Slave Node as
mediaadmin$ cat ~/.ssh/id_rsa.pub | ssh pluto@Slave 'cat >> ~/.ssh/authorized_keys'


Login to Slave node
Master:~ mediaadmin$ ssh pluto@Slave
Last login: Thu Oct 25 18:54:15 2012 from 10.203.33.80


and Log out
plutos-iMac:~ pluto$ exit
logout

Connection to Slave closed.


Login to Master node (here it asks for password)
Master:~ mediaadmin$ ssh Master
Password:
Last login: Thu Oct 25 19:03:27 2012 from master

HERE COMES THE ISSUE

when I run start-dfs.sh, its asks for password and I did enter the pass word of Master but
i didn't accept.

Master:~ mediaadmin$ start-dfs.sh
starting namenode, logging to /HADOOP/hadoop-0.20.2/bin/../logs/hadoop-mediaadmin-namenode-Master.out
Password:Password:
Password:
Password:
Slave: Permission denied (publickey,keyboard-interactive).

Password:
Master: starting datanode, logging to /HADOOP/hadoop-0.20.2/bin/../logs/hadoop-mediaadmin-datanode-Master.out
Password:
Master: starting secondarynamenode, logging to /HADOOP/hadoop-0.20.2/bin/../logs/hadoop-mediaadmin-secondarynamenode-Master.out




When I enter password of Slave then it again goes like this.

Master:~ mediaadmin$ start-dfs.sh
starting namenode, logging to /HADOOP/hadoop-0.20.2/bin/../logs/hadoop-mediaadmin-namenode-Master.out
Password:Password:
Password:
Password:
Password:
Password:
Master: Permission denied (publickey,keyboard-interactive).


Slave: Permission denied (publickey,keyboard-interactive).
Password:
Password:
Password:
Master: Permission denied (publickey,keyboard-interactive).




Please suggest me where I am going wrong, and why is asking for password when I configured
it as password less SSH,

where I doing mistake in SSH or some thing else.


Thanks & Regards
Yogesh Kumar Dhari

________________________________
From: Andy.Kartashov@mpac.ca
To: user@hadoop.apache.org
Subject: RE: ERROR:: SSH failour for distributed node hadoop cluster
Date: Thu, 25 Oct 2012 16:37:36 +0000
Yogesh,

One need to understand how passwordless ssh work.

Say there is a user “yosh”
He types ssh localhost and is prompted for a password. This is how to resolve this.

1.
Type : ssh-keygen -t rsa

-t stand for type and rsa (encryption)  - another type will be dsa.

Well, after you run above command,  a pair of private and public keys is generated and stored
in your /home/yosh/.ssh folder.

“cd” in there and you will see two files. Id_rsa (private key) and id_rsa_pub (public
key).

If you create a file called “authorized_keys” and place your public key in there you will
achieve psswdless access. How to do it?

2.
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

The above command reads your PubKey and appends to the file. After that try “ssh localhost”
again. Voila! No more password request.

Now, imagine you are ssh-ing into this very same machine from another computer where u  log-in
as yosh. “ssh < ip>”.  The machine will similarly let you in without password.

p.s. If you do not know ip address of that machine, find out by simply typing “hostname
–i”.

Happy hadoop’ing.

AK47


From: yogesh dhari [mailto:yogeshdhari@live.com]
Sent: Thursday, October 25, 2012 12:12 PM
To: hadoop helpforoum
Subject: RE: ERROR:: SSH failour for distributed node hadoop cluster


Hi Andy,

I am still at that point, not able to solve it yet

Please help, Same issue with all settings and commands I have raise by Subject
ERROR: : Hadoop Installation in distributed mode.‏
to the mailing llist.


Thanks & Regards
Yogesh Kumar
________________________________
From: Andy.Kartashov@mpac.ca
To: user@hadoop.apache.org
Subject: RE: ERROR:: SSH failour for distributed node hadoop cluster
Date: Thu, 25 Oct 2012 16:01:56 +0000
Yogesh,

Have you figured it out?  I had the same issue (needed passwordless ssh) and managed. Let
me know if you are still stuck.

AK47

From: yogesh.kumar13@wipro.com [mailto:yogesh.kumar13@wipro.com]
Sent: Thursday, October 25, 2012 4:28 AM
To: user@hadoop.apache.org
Subject: ERROR:: SSH failour for distributed node hadoop cluster
Importance: High

Hi all,

I am trying to run the command

ssh Master

it runs and shows after entering password.
Password: abc
Last login: Thu Oct 25 13:51:06 2012 from master

But ssh for Slave through error.



ssh Slave

it asks for password ans denie

Password: abc
Password: abc
Password: abc
Permission denied (publickey,keyboard-interactive).

Please suggest.
Thanks & regards
Yogesh Kumar
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the intended recipient, please delete and contact the sender immediately. Please consider
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