Ssh key authentication. Specifying alternative identity files (like id_rsa) for different hosts

By neokrates, written on September 2, 2010

howto

neokrates
Email: uwarov@yahoo.com
Website: http://www.thinkplexx.com
Join date: 05-31-09
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You have different keypairs, one per host. Here is how you can setup ssh to use them with right hosts

Works for:

OpenSSH
any OS

Given ls -Al ~/.ssh:

...
-rw------- 1 slave1 hudson 667 Sep 1 16:33 id_dsa_git_readonly
-rw------- 1 slave1 hudson 667 Sep 1 16:33 id_dsa_svn
-rw------- 1 slave1 hudson 667 Sep 1 16:33 id_dsa_nexus
...

There are 3 hosts where you need to be authenticated:
gitorious.your.corp, svn.your.corp, nexus.your.corp

Add a ~/.ssh/config file with:

Host gitorious
 
  Hostname gitorious.your.corp
  User git
  PreferredAuthentications publickey
  IdentityFile ~/.ssh/id_dsa_git_readonly
 
Host svn
 
  Hostname svn.your.corp
  User yoursvnuser
  PreferredAuthentications publickey
  IdentityFile ~/.ssh/id_dsa_svn
 
Host nexus
 
  Hostname nexus.your.corp
  User yournexususer
  PreferredAuthentications publickey
  IdentityFile ~/.ssh/id_dsa_nexus

Now, we have configured openssh to be aware of three hosts, and to use specified publickeys for each.

That’s it, have fun!

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