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Old 05-22-2013, 03:36 AM   #1
rajasekarans
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Registered: Jan 2010
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ssh issue


Hi Friends,

i am trying to configure oracle RAC in my test server. for that i need to enable the ssh(if i do an ssh it should not ask for password) this is my requirement.

I followed the below step:-

[oracle@slave1 .ssh]$ chmod 700 ~/.ssh
[oracle@slave1 .ssh]$ /usr/bin/ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/oracle/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/oracle/.ssh/id_rsa.
Your public key has been saved in /home/oracle/.ssh/id_rsa.pub.
The key fingerprint is:
3e:fc:be:ab:87:d1:a3:f2:11:4c:22:cc:70:56:34:09 oracle@slave1.raja.com
[oracle@slave1 .ssh]$ /usr/bin/ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/home/oracle/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/oracle/.ssh/id_dsa.
Your public key has been saved in /home/oracle/.ssh/id_dsa.pub.
The key fingerprint is:
98:48:72:c1:21:29:98:66:a0:74:42:de:a9:8b:09:e4 oracle@slave1.raja.com
[oracle@slave1 .ssh]$
[oracle@slave1 .ssh]$
[oracle@slave1 .ssh]$ cd ~/.ssh
[oracle@slave1 .ssh]$ ls
id_dsa id_dsa.pub id_rsa id_rsa.pub
[oracle@slave1 .ssh]$ cat id_rsa.pub >>authorized_keys
[oracle@slave1 .ssh]$ cat id_dsa.pub >>authorized_keys
[oracle@slave1 .ssh]$
[oracle@slave1 .ssh]$ ls
authorized_keys id_dsa id_dsa.pub id_rsa id_rsa.pub
[oracle@slave1 .ssh]$ scp authorized_keys slave2.raja.com:/home/oracle/.ssh/
The authenticity of host 'slave2.raja.com (192.168.2.8)' can't be established.
RSA key fingerprint is d7:c1:ff:6f:ab:ec:70:d9:f9:0b:89:e3:43:a2:f1:88.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'slave2.raja.com,192.168.2.8' (RSA) to the list of known hosts.
oracle@slave2.raja.com's password:
authorized_keys 100% 1016 1.0KB/s 00:00
[oracle@slave1 .ssh]$ ssh slave2.raja.com
Enter passphrase for key '/home/oracle/.ssh/id_rsa':
Last login: Wed May 22 12:40:31 2013 from 192.168.2.3

[oracle@slave1 .ssh]$ ssh slave2.raja.com date
Wed May 22 13:59:12 IST 2013
[oracle@slave1 .ssh]$

First node is working fine. But if i try it on the second node as below it asking for the password.

[oracle@slave2 .ssh]$
[oracle@slave2 .ssh]$ chmod 700 ~/.ssh
[oracle@slave2 .ssh]$
[oracle@slave2 .ssh]$
[oracle@slave2 .ssh]$ /usr/bin/ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/oracle/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/oracle/.ssh/id_rsa.
Your public key has been saved in /home/oracle/.ssh/id_rsa.pub.
The key fingerprint is:
89:f7:49:0e:c9:6a:b3:7f:6e:9a:3f:08:02:78:9a:b0 oracle@slave2.raja.com
[oracle@slave2 .ssh]$ /usr/bin/ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/home/oracle/.ssh/id_dsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/oracle/.ssh/id_dsa.
Your public key has been saved in /home/oracle/.ssh/id_dsa.pub.
The key fingerprint is:
f9:a1:fe:3a:b9:54:50:47:02:81:c7:96:9e:b4:5f:39 oracle@slave2.raja.com
[oracle@slave2 .ssh]$ ssh slave1.raja.com date
oracle@slave1.raja.com's password:
Wed May 22 20:59:03 IST 2013
[oracle@slave2 .ssh]$ ls


kindly help me to resolve this issue.

Regards,
Rajasekar.s
 
Old 05-22-2013, 03:39 AM   #2
acid_kewpie
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well in what you've posted, you've not copied the key across.
 
Old 05-22-2013, 03:46 AM   #3
rajasekarans
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Registered: Jan 2010
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Quote:
Originally Posted by acid_kewpie View Post
well in what you've posted, you've not copied the key across.


Do you mean from the second node i have to perform the below step:

scp authorized_keys slave1.raja.com:/home/oracle/.ssh/

right ?
 
Old 05-22-2013, 03:47 AM   #4
acid_kewpie
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well yes, you still have to do that too.

Last edited by acid_kewpie; 05-22-2013 at 04:12 AM.
 
Old 05-22-2013, 03:51 AM   #5
rajasekarans
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Quote:
Originally Posted by acid_kewpie View Post
weell yes, you still have to do that too.

[oracle@slave2 .ssh]$ scp authorized_keys slave1.raja.com:/home/oracle/.ssh/
oracle@slave1.raja.com's password:
authorized_keys 100% 2032 2.0KB/s 00:00
[oracle@slave2 .ssh]$ ssh slave1.raja.com date
oracle@slave1.raja.com's password:
Wed May 22 22:25:42 IST 2013
[oracle@slave2 .ssh]$


Done it still it is asking for password.
 
Old 05-22-2013, 04:00 AM   #6
rajasekarans
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Registered: Jan 2010
Posts: 6

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Quote:
Originally Posted by rajasekarans View Post
[oracle@slave2 .ssh]$ scp authorized_keys slave1.raja.com:/home/oracle/.ssh/
oracle@slave1.raja.com's password:
authorized_keys 100% 2032 2.0KB/s 00:00
[oracle@slave2 .ssh]$ ssh slave1.raja.com date
oracle@slave1.raja.com's password:
Wed May 22 22:25:42 IST 2013
[oracle@slave2 .ssh]$


Done it still it is asking for password.
Hi Chris,

i am not an Linux administrator i am an oracle DBA, please help me i dont have much idea on linux aministration.
 
Old 05-22-2013, 04:15 AM   #7
acid_kewpie
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I really don't think being an administrator matters at all here, and a DBA should be pretty fine with the logic at play here. You did a bunch of things to make it work in one direction, so do EXACTLY the same thing again to make it work in the other. Have you created the appropriate authorized_keys file? If you're going to keep the SAME file on both machines then clearly the file needs to contain both systems SSH public keys
 
  


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