sshで公開鍵認証を使ってアクセスする ref: http://qiita.com/mountcedar/items/43157ff1225c56500655

file0.txt

$ cd ~/.ssh
$ ssh-keygen -t rsa -f <filename>

file1.txt

$ scp <filename>.pub <hostname>:.ssh/.

file2.txt

$ mv <filename> id_rsa
$ chmod 600 id_rsa

file3.txt

$ ssh <hostname>
<パスワードによるログイン>
$ cd .ssh
$ cat <filename>.pub >> authorized_keys
$ chmod 600 authorized_keys
$ exit

file4.txt

$ ssh <hostname>
$

file5.txt

$ mkdir .ssh
$ chmod 700 .ssh

file6.txt

$ ls -al .ssh

file7.txt

$ chmod 600 <target>

file8.txt

$ ssh -i ~/.ssh/<privatekey> <hostname>

file9.txt

Host <hostname or nickname>
  HostName <hostname or ip address>
  User <username>
  Port <port number>
  UserKnownHostsFile /dev/null
  StrictHostKeyChecking no
  PasswordAuthentication no
  IdentityFile ~/.ssh/<privatekey>
  IdentitiesOnly yes
  LogLevel FATAL