로컬 포트 포워딩

# [1] Bastion 필요 없음 (Public EC2)
Host pub-db-lfwd
    HostName     3.4.5.6
    User         ubuntu   # 주의
    IdentityFile key.pem
    LocalForward 16432 3.4.5.6:5432
    # Postgres: localhost:16432 -> 3.4.5.6:5432

##############################################################

# Bastion
Host db-bas
    HostName     1.2.3.4
    Port         22
    User         ec2-user
    IdentityFile key.pem

# [2] 로컬 포트 포워딩 : -> Bastion -> Target
Host ats-rds-lfwd
    HostName     1.2.3.4
    Port         22
    User         ec2-user
    IdentityFile key.pem
    LocalForward 6432 __rds__.rds.amazonaws.com:5432
    # Postgres:  localhost:6432 -> RDS:5432