root@ceph01:~# ssh-keygen

Generating public/private rsa key pair.

Enter file in which to save the key (/root/.ssh/id_rsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_rsa.

Your public key has been saved in /root/.ssh/id_rsa.pub.

The key fingerprint is:

1e:f1:c6:c5:c4:8e:e0:b3:ed:9f:2c:::ce:8a:0d root@ceph01

The key's randomart image is:

+--[ RSA ]----+

|           ..    |

|        .  o.    |

|       ... oo    |

|      . ++...    |

|     o oS++      |

|  E   o.ooo      |

|   + .  .o .     |

|  . o     o. .   |

|           o+    |

+-----------------+

root@ceph01:~# ssh-copy-id ceph02

/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed

/usr/bin/ssh-copy-id: INFO:  key(s) remain to be installed -- if you are prompted now it is to install the new keys

root@ceph02's password: 

Number of key(s) added: 

Now try logging into the machine, with:   "ssh 'ceph02'"

and check to make sure that only the key(s) you wanted were added.

root@ceph02:~/.ssh# cat authorized_keys

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC1hXDFOCI0hdsZlvuP9FGLnCd6k6yR51T6WN4+Wr/shJlY6ymcxde2hwBhiGowvKNbhpVA3EHUxtV0W9YH742ymTmUCVBCuGd2zUwB36AR9aiQGFwSd8vulqaybirpsic9iZ4d83cGjdJwSQg5mGhxZpzi4qD8yygdEDkTcczIFj+9zh5BCIlsZXFHU8044wIKBAbp2YvrsCW0L81XvVJZo3OJxggbUYlMhXcws99U7q2JcBUKv9IQYjar9GyYh4DNlllDs56sfR6SDtuT1O6NOtKSCc6jxCpf7EmxgBXIeYQiSUKnwDo3CE4FmvFsmTlkFUkOluJIRGUTbkokw5tJ root@ceph01

Port

# Use these options to restrict which interfaces/protocols sshd will bind to

#ListenAddress ::

#ListenAddress 0.0.0.0

Protocol

# HostKeys for protocol version

HostKey /etc/ssh/ssh_host_rsa_key

HostKey /etc/ssh/ssh_host_dsa_key

HostKey /etc/ssh/ssh_host_ecdsa_key

HostKey /etc/ssh/ssh_host_ed25519_key

#Privilege Separation is turned on for security

UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version  server key

KeyRegenerationInterval

ServerKeyBits 

# Logging

SyslogFacility AUTH

LogLevel INFO

# Authentication:

LoginGraceTime

PermitRootLogin yes

StrictModes yes

RSAAuthentication yes

PubkeyAuthentication yes

AuthorizedKeysFile      %h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files

IgnoreRhosts yes

# For this to work you will also need host keys in /etc/ssh_known_hosts

RhostsRSAAuthentication no

# similar for protocol version

HostbasedAuthentication no

.

.

.

root@ceph01:~# ssh root@ceph02

Welcome to Ubuntu 14.04 LTS (GNU/Linux 3.13.--generic x86_64)

 * Documentation:  https://help.ubuntu.com/

  System information as of Wed Jan  :: CST 

  System load:  0.0               Processes:

  Usage of /:   3.7% of .95GB   Users logged in:

  Memory usage: %                IP address for eth0: 192.168.20.178

  Swap usage:   %

  Graph this data and manage this system at:

    https://landscape.canonical.com/

 packages can be updated.

 updates are security updates.

New release '16.04.1 LTS' available.

Run 'do-release-upgrade' to upgrade to it.

Last login: Wed Jan  ::  from 192.168.20.116

root@ceph02:~#