Q:

connecting to multiple instances of EC2 with ssh

I just started out with Amazon web services and was able to launch an instance.  A friend showed me a sample tutorial of how to connect to AWS with ssh.  Pretty neat.  I downloaded the key and edited /.ssh/config file.  
Sample of the config file
Host *
ServerAliveInterval 300

Host <name desired to connect>
 HostName <domain name>
 port 22
 User ubuntu
 IdentityFile /pathname/keyfile

My question is what if i have 2 instances and now i want to ssh to the new instance launched.  How will i edit the config file.  I'm stuck and also new to Linux(been learning Linux yesterday and it's pretty cool and powerful).  Thanks for the help. 

A:

You can ssh to any ec2 instance by running this on terminal:
ssh -i path_to_pem_file ubuntu@<HostIP_or_NAME>

eg. 
ssh -i /temp/root1.pem ubuntu@54.23.122.34

