Problem logging into the master node in Amazon EC2

[Xuan Dzung Doan <do...@yahoo.com>]

Hi,

I'm new to Hadoop and Linux. I hope my question is basic.

I just downloaded Hadoop 0.16.4 to my Fedora 8 workstation to use the scripts to launch EC2 instances of Hadoop 0.16.1 on Amazon. I completed the configuration step and issued the command to launch the instances:

% bin/hadoop-ec2 run

The instances were launched successfully and I was also done with DNS setting. But when the script tried to log me into the master node, an issue occured with a message like this:

--------------------
WARNING: UNPROTECTED PRIVATE KEY FILE

Permissions 0644 for 'private_key_file_path_and_name' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
bad permissions: ignore key: private_key_file_path_and_name
--------------------

then I was asked for the password to log into the master node as root. Of course I was not able to go further.

Any idea how I can resolve this private key issue?

Thanks,
David.



      

Re: Problem logging into the master node in Amazon EC2

[Andreas Kostyrka <an...@kostyrka.org>]

Well, the message says it clearly :-P

Some basic Unix knowledge that might help:

-) Permissions in unix are (r)ead/(w)rite/e(x)ecute for the user 
(owner)/group/world.

-) for historic reasons, permissions are often given as octal numbers as in 
this case. 0644 means rw for owner, r for group and world.

-) ssh does not like the fact that the private key file is readable by anyone 
but the owner. As I don't use the EC2 scripts, I cannot tell you for sure, 
BUT somewhere that 'private_key_file_path_and_name' is, and you need to run 
chmod 600 private_key_file_path_and_name on it.

Andreas

On Friday 06 June 2008 08:45:48 Xuan Dzung Doan wrote:
> Hi,
>
> I'm new to Hadoop and Linux. I hope my question is basic.
>
> I just downloaded Hadoop 0.16.4 to my Fedora 8 workstation to use the
> scripts to launch EC2 instances of Hadoop 0.16.1 on Amazon. I completed the
> configuration step and issued the command to launch the instances:
>
> % bin/hadoop-ec2 run
>
> The instances were launched successfully and I was also done with DNS
> setting. But when the script tried to log me into the master node, an issue
> occured with a message like this:
>
> --------------------
> WARNING: UNPROTECTED PRIVATE KEY FILE
>
> Permissions 0644 for 'private_key_file_path_and_name' are too open.
> It is recommended that your private key files are NOT accessible by others.
> This private key will be ignored.
> bad permissions: ignore key: private_key_file_path_and_name
> --------------------
>
> then I was asked for the password to log into the master node as root. Of
> course I was not able to go further.
>
> Any idea how I can resolve this private key issue?
>
> Thanks,
> David.