[one-users] Passwordless ssh between VM's?

[biro lehel]

Sorry, I missed a reference in the previous one. Completed below.

--- On Fri, 3/23/12, biro lehel <lehel.biro at yahoo.com> wrote:

From: biro lehel <lehel.biro at yahoo.com>
Subject: Re: [one-users] Passwordless ssh between VM's?
To: "Poul Kristensen" <bcc5226 at gmail.com>, "Olivier Sallou" <olivier.sallou at irisa.fr>
Cc: users at lists.opennebula.org
Date: Friday, March 23, 2012, 8:49 AM

Hello,

Thank you both Poul and Olivier for your answers. Poul, regarding my environment: it is small-scale experimental environment (up to ~10 VM's), NOT a production one.  For experimental and test cases, should I go with the solution written by Olivier, or is it still more easier and convenient to use Kerberos? I would like to choose the most easily implementable solution here, since I'm a bit running out of time.

Regarding Olivier's solution.. as I understand, it's basically the same than the method for obtaining passwordless ssh between the physical nodes, described at [1]. My question is, what is the difference
 (if any) between setting up pwdless ssh between the physical machines, and setting up pwdless ssh between the VM's? Also, Olivier, you have mentioned this:

 >At boot
 time you load the ssh key for a file set in CONTEXT
    template, with a key    
 >dedicated per user. Or, still at boot time, you
    trigger a server (you made) to get a SSH  
 >key from the VM ip.

I'm not exactly sure what these mean. Could you or anyone else please detail what to do to obtain these boot-time settings?

[1] http://opennebula.org/documentation:rel3.2:ssh_auth

Thank you, 
Lehel.


--- On Thu, 3/22/12, Poul Kristensen <bcc5226 at gmail.com> wrote:

From: Poul Kristensen <bcc5226 at gmail.com>
Subject: Re: [one-users] Passwordless ssh between VM's?
To: users at lists.opennebula.org
Date: Thursday, March 22, 2012, 12:40 PM

Setup a Kerberos server and use tickets. You do not need to arrange private/public keys on every server (host/vm's). 

2012/3/22 Olivier Sallou <olivier.sallou at irisa.fr>


  
    
  
  
    

    

    Le 3/22/12 6:53 AM, biro lehel a écrit :
    
      
        
          
            Hello everyone,

              

              I'm looking for the most convenient setting to be able to
              passwordlessly ssh between the VM's created by OpenNebula.
              I've noticed that the settings which provide passwordless
              ssh from the Front-end (or Hosts) into VM's do not deal
              with this, the system is still asking for a password if I
              want to ssh from VM into VM. So, did I do something wrong,
              and in theory, the exact same steps would need to be
              followed in case of VM's too, or is there some trick?

            
          
        
      
    
    

    To enable password less communication between VMs you need top
    create a SSH key for a user (root?) that will be in all you VMs.

    You should also disable in ssh_config the know_hosts feature (or
    redirect it to /dev/null).

    

    For SSH there are multiple means. You create a VM with a SSH key
    inside, the drawback is the SSH key is the same for all VMs e.g. all
    users, this is not secure but for test only it would fit.

    At boot time you load the ssh key for a file set in CONTEXT
    template, with a key dedicated per user. Or, still at boot time, you
    trigger a server (you made) to get a SSH key from the VM ip.

    

    Olivier

    

    
      
        
          
            

              Thank you, 

              Lehel.

            
          
        
      
      

      
      

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    -- 
Olivier Sallou
IRISA / University of Rennes 1
Campus de Beaulieu, 35000 RENNES - FRANCE
Tel: 02.99.84.71.95

gpg key id: 4096R/326D8438  (keyring.debian.org)
Key fingerprint = 5FB4 6F83 D3B9 5204 6335  D26D 78DC 68DB 326D 8438


  


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