You can set these up yourself in your configuration file $HOME/.ssh/config.
For example:
Host *.amazonaws.com
User ec2-user
Host 192.0.2.1
User centos
make ssh remember host's username
You can set these up yourself in your configuration file $HOME/.ssh/config.
For example:
Host *.amazonaws.com
User ec2-user
Host 192.0.2.1
User centos