29a.ch by Jonas Wagner

Deploy ssh public key to multiple servers using python and paramiko

This is a little snippet I wrote to install my publickey onto multiple servers at once. The actual script I use automatically detects all the servers. It is using paramiko to do the actual ssh work.

#!/usr/bin/python
import os
from getpass import getpass

import paramiko

def deploy_key(key, server, username, password):
    client = paramiko.SSHClient()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    client.connect(server, username=username, password=password)
    client.exec_command('mkdir -p ~/.ssh/')
    client.exec_command('echo "%s" > ~/.ssh/authorized_keys' % key)
    client.exec_command('chmod 644 ~/.ssh/authorized_keys')
    client.exec_command('chmod 700 ~/.ssh/')

key = open(os.path.expanduser('~/.ssh/id_rsa.pub')).read()
username = os.getlogin()
password = getpass()
hosts = ["hostname1", "hostname2", "hostname3"]
for host in hosts:
    deploy_key(key, host, username, password)
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