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Full Discussion: Passwordless ssh
Top Forums UNIX for Advanced & Expert Users Passwordless ssh Post 302684455 by jim mcnamara on Thursday 9th of August 2012 03:15:58 PM
Old 08-09-2012
1. login into every server on the network. make keys. copy the keys to one location.
each key with a unique name
2. if you have 10 servers, you will need ten separate keys.
3. combine all those keys into one file with
Code:
cat keyfilename1 keyfilename2 ... keyfilename_last >> authorized_keys

4. copy that one authorized_keys file back to every server, into the .ssh directory.

The >> is there in case you decide to use an existing real authorized_keys file, otherwise just use >.
 

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SSH-COPY-ID(1)						    BSD General Commands Manual 					    SSH-COPY-ID(1)

NAME
ssh-copy-id -- copy public keys to a remote host SYNOPSIS
ssh-copy-id [-lv] [-i keyfile] [-o option] [-p port] [user@]hostname DESCRIPTION
The ssh-copy-id utility copies public keys to a remote host's ~/.ssh/authorized_keys file (creating the file and directory, if required). The following options are available: -i file Copy the public key contained in file. This option can be specified multiple times and can be combined with the -l option. If a private key is specified and a public key is found then the public key will be used. -l Copy the keys currently held by ssh-agent(1). This is the default if the -i option was not specified. -o ssh-option Pass this option directly to ssh(1). This option can be specified multiple times. -p port Connect to the specified port on the remote host instead of the default. -v Pass -v to ssh(1). The remaining arguments are a list of remote hosts to connect to, each one optionally qualified by a user name. EXIT STATUS
The ssh-copy-id utility exits 0 on success, and >0 if an error occurs. EXAMPLES
To send a specific key to multiple hosts: $ ssh-copy-id -i /path/to/keyfile.pub user@host1 user@host2 user@host3 HISTORY
The ssh-copy-id utility was written by Eitan Adler <eadler@FreeBSD.org> as a drop-in replacement for an existing utility included with OpenSSH. BSD
February 28, 2014 BSD
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