Jump Private Server Via Bastion Host Single Hop (Linux or Mac Host)

sshd config

<< Add Config to sshd config - ~/.ssh/config >> 
# vim ~/.ssh/config 

=====================================
### Bastion Host Jump Config 
## Private Server 
Host private-server-1
      HostName 192.168.1.2
      User ubuntu
      IdentityFile /path/private_key.pem
      ProxyJump bastion

Host private-server-2
      HostName 192.168.1.3
      User ubuntu
      IdentityFile /path/private_key.pem
      ProxyJump bastion

## Bastion Server 
Host bastion
      HostName 192.168.1.1
      User ubuntu
      IdentityFile /path/bastion_key.pem
=====================================

<< Login Commad >>
# ssh private-server-1
# ssh private-server-2