How to connect to localhost using Python's paramiko?

Question

I am totally new to implementing client-server communication and am trying to get started with a very basic example using Python's paramiko module. All I want to do is to send a simple string to my machine's localhost from one terminal window and retrieve it from there in another terminal window.

This is what I have so far:

import paramiko

ssh = paramiko.SSHClient()

ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

ssh.connect(hostname='localhost', username='myun', password='mypwd')

stdin, stdout, stderr = ssh.exec_command('echo "Hello"')

print stdout

ssh.close()

What is get is this:

Traceback (most recent call last):
  File "./ssh.py", line 13, in <module>
    ssh.connect(hostname='localhost', username='myun', password='mypwd')
  File "/usr/local/lib/python2.7/site-packages/paramiko/client.py", line 251, in connect
    retry_on_signal(lambda: sock.connect(addr))
  File "/usr/local/lib/python2.7/site-packages/paramiko/util.py", line 270, in retry_on_signal
    return function()
  File "/usr/local/lib/python2.7/site-packages/paramiko/client.py", line 251, in <lambda>
    retry_on_signal(lambda: sock.connect(addr))
  File "/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/lib/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
socket.error: [Errno 61] Connection refused

Can anybody please advise where I am going wrong here? Why can't I connect to localhost using my correct username and password?

Hm ... good question. How do I find out whether this is the case or not? — Pat
– Pat, Commented Feb 24, 2015 at 21:40

wfr · Accepted Answer · 2015-02-24 21:38:38Z

2

This should connect properly if SSH is accepting connections on localhost. OpenSSH does by default. Check /etc/ssh/sshd_config and your firewall. Another possibility is that "localhost" isn't configured properly in /etc/hosts. Try with 127.0.0.1 or ::1.

Note that to get the actual stdout, use:

print stdout.read()

answered Feb 24, 2015 at 21:38

wfr

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3 Comments

Pat Over a year ago

I checked /etc/hosts which lists the correct config: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost

Pat Over a year ago

Should this worry me? cat: /etc/ssh/sshd_config: No such file or directory

vipulb Over a year ago

May be ssh server is not installed. Install it and then try.

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