dries@air-2:~$ fab -H urga@ssh.alwaysdata.com host_type
[urga@alwaysdata.com] Executing task 'host_type'
[urga@alwaysdata.com] run: uname -s

Fatal error: Low level socket error connecting to host alwaysdata.com: No route to host

Aborting.
dries@air-2:~$ cat fabfile.py
from fabric.api import run

def host_type():
    run('uname -s')
dries@air-2:~$ ssh urga@ssh.alwaysdata.com 'uname -s'
Linux
dries@air-2:~$