Using an SSH keyfile with Fabric

Question

How do you configure fabric to connect to remote hosts using SSH keyfiles (for example, Amazon EC2 instances)?

Answer 1

For me, the following didn't work:

env.user=["ubuntu"]
env.key_filename=['keyfile.pem']
env.hosts=["xxx-xx-xxx-xxx.ap-southeast-1.compute.amazonaws.com"]

or

fab command -i /path/to/key.pem [-H [user@]host[:port]]

However, the following did:

env.key_filename=['keyfile.pem']
env.hosts=["ubuntu@xxx-xx-xxx-xxx-southeast-1.compute.amazonaws.com"]

or

env.key_filename=['keyfileq.pem']
env.host_string="ubuntu@xxx-xx-xxx-xxx.ap-southeast-1.compute.amazonaws.com"