https://zzang9ha.tistory.com/329?category=954133
<탄력적 IP 설정> https://artiiicy.tistory.com/17
<putty 다운로드> https://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html
<putty - hostname> ec2-user@'탄력적ip'