多段SSH
PC --(pubkey)--> 踏み台(bastion) --(password)--> リモート(remote1, remote2)
# 踏み台 Host bastion Hostname bastion.exapmle.com User pen PreferredAuthentications publickey IdentityFile ~/.ssh/bastion.id_rsa IdentitiesOnly yes # 踏み台の先 Host remote1 remote2 User www PreferredAuthentications password ProxyCommand ssh -W %h:%p bastion Host remote1 Hostname remote1.example.com Host remote2 Hostname remote2.example.com