Paramiko只连接到IP地址而不是Python中的主机名？

Question

I have function like this in python:

def test_ssh(host, username, password):
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh.connect(host, username=username, password=password)

Problem is: test_ssh('127.0.0.1', 'root', 'hello') works

But test_ssh('localhost', 'root', 'hello') doesn't work

Error I get is:

ssh: Could not resolve hostname localhost: Name or service not known

What's causing this? Thanks

Answer 1

尝试给ssh.connect(hostname=host, username=username, password=password)

Answer 2

Since my comments werent making much sense (putting them all together) (assuming your OS is Linux) -

Reason for your error -

ssh: Could not resolve hostname localhost: Name or service not known

Is - DNS resolution of HOSTNAME is not providing proper IP (comment#1)

Test with this command (terminal)-

host localhost

What you can try -

Edit /etc/hosts file, put in the IP and Hostname in this file. That ought to resolve your Hostname and IP Like This -

#IP hostname [[alias1] [...]]
127.0.0.1 localhost
172.22.0.9 mymachine.home mymachine

Lastly an awesome link - http://bit.ly/IHhA1R

EDIT

Possible workflow -

• User Registers, enters HOSTNAME
• We run command (with python we can use os.subprocess or os.popen) -

bash$ dig HOSTNAME

• Fetch the IP of the HOSTNAME
• Try Connection to HOST with IP instead of the HOSTNAME

Always use the same workflow to get Latest IP of the HOSTNAME provided by the user, connect using IP instead of HOSTNAME

Answer 3

Actually this can even not work when host can be resolved.

First try:

import socket
socket.getaddrinfo('google.com', None)
socket.getaddrinfo('localhost', None)

If google.com returns tuple with address and localhost also returns correctly - then your system setup is correct. I do not know why but I had this issue and passing socket.getaddrinfo(host, None)[0][1][4] worked.