Fabrics 2. X Ssh Connection Using Identity Fails to Work

Fabric accepts a hosts iterable as parameters in tasks. Per the documentation:

An iterable of host-connection specifiers appropriate for eventually instantiating a Connection. The existence of this argument will trigger automatic parameterization of the task when invoked from the CLI, similar to the behavior of --hosts.

One of the members of which could be:

A string appropriate for being the first positional argument to Connection - see its docs for details, but these are typically shorthand-only convenience strings like hostname.example.com or user@host:port.

As for your example, please try this for fabfile.py:

host_list = ["my_host"]

@task(hosts=host_list)
def tt(c):
    c.run('uname -a')

Alternatively, you can omit the host declaration from the fabfile altogether. If you don't specify the host in fabfile.py, you can simply specify it as a host when invoking the fab cli utility. If your fabfile.py is this:

@task
def tt(c):
    c.run('uname -a')

You would now run fab -H my_host tt to run it on the alias tt from your SSH client config.

Hope this helps.

Same problem.

You can try add -d for more detail when fabric run:

fab2 -d tt

I found the exception: paramiko.ssh_exception.SSHException: Invalid key, then regenerate key from server, problem solved.