.ssh/config file

config

ForwardAgent yes
AddKeysToAgent yes
IdentityFile ~/.ssh/MY_PRIVATE_KEY
ForwardX11 yes
ForwardX11Trusted yes
TCPKeepAlive yes
ServerAliveInterval 60
ServerAliveCountMax 2

############## EXTERNAL EXAMPLE (AWS) ##############
# for example the port 22 is blocked (some reasons)
# you can use the 'my-jump-host' to ssh throug e.g. 443
Host my-jump-host
  HostName domain.of.my.jump-host.io # e.g. an AWS EC2
  ProxyCommand nc -X connect -x proxy.domain.intern:8080 %h %p
  Port 443
  User MY_OTHER_USER

Host my-eg-aws-host
  HostName 10.180.10.10
  ProxyJump my-jump-host
  User MY_OTHER_USER

Host default-ec2
  HostName 127.0.0.1 # (public ip of ec2 instance)
  User ubuntu

############## EXTERNAL EXAMPLE (AWS) ##############

############## PROD ##############
Host prod-machine
  HostName domain.or-ip.of-prod-host.com
  User MY_PROD_USER

############## PROD ##############

############## QA ##############
Host qa-machine
  HostName domain.or-ip.of-qa-host.com
  User MY_QA_USER

############## QA ##############

############## DEV ##############
Host dev-machine
  HostName 127.0.0.1 # (some internal IP)

############## DEV ##############

# default settings, if no alias is used, or no other information is provided
Host *
  User MY_DEFAULT_USER
  Port 22