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 fabric2 in fabfile use the following:

from fabric import task, Connection

@task
def staging(ctx):
    ctx.name = 'staging'
    ctx.user = 'ubuntu'
    ctx.host = '192.1.1.1'
    ctx.connect_kwargs.key_filename = os.environ['ENV_VAR_POINTS_TO_PRIVATE_KEY_PATH']

@task
def do_something_remote(ctx):
    with Connection(ctx.host, ctx.user, connect_kwargs=ctx.connect_kwargs) as conn:
        conn.sudo('supervisorctl status')

and run it with:

fab staging do_something_remote

UPDATE:
For multiple hosts (one host will do also) you can use this:

from fabric2 import task, SerialGroup

@task
def staging(ctx):
    conns = SerialGroup(
        'user@10.0.0.1',
        'user@10.0.0.2',
        connect_kwargs=
        {
            'key_filename': os.environ['PRIVATE_KEY_TO_HOST']
        })
    ctx.CONNS = conns
    ctx.APP_SERVICE_NAME = 'google'

@task
def stop(ctx):
    for conn in ctx.CONNS:
        conn.sudo('supervisorctl stop ' + ctx.APP_SERVICE_NAME)

and run it with fab or fab2:

fab staging stop