Amazon EC2にSudoユーザーを追加する。 ref: http://qiita.com/syou007/items/f3feaa6688ce70900642

file0.sh

$ ssh ec2-user@xxxx -i xxx.pem
$ useradd sudo-user

file1.sh

$ ssh-keygen -t rsa

file10.txt

no-port-forwarding,no-agent-forwarding,no-X11-forwarding,command="echo 'Please login as the user \"ec2-user\" rather than the user \"root\".';echo;sleep 10" ssh-rsa XXXXXXXX

file2.sh

$ ssh ec2-user@xxxx -i xxx.pem
# 作成したsudoユーザーに切り替える。
$ sudo su - sudo-user 
$ mkdir .ssh
$ vi .ssh/authorized_keys

file3.sh

$ ssh ec2-user@xxxx -i xxx.pem
$ sudo visudo

file4.txt

root    ALL=(ALL)       ALL
sudo-user ALL=(ALL)       NOPASSWD:ALL

file5.sh

$ ssh sudo-user@xxx -i ras[さっき作った鍵]
$ sudo ls

file6.sh

$ sudo visudo -f /etc/sudoers.d/cloud-init

file7.sh

$ sudo view /etc/ssh/sshd_config

file8.txt

PermitRootLogin forced-commands-only

file9.sh

$ sudo view /root/.ssh/authorized_keys