linux ssh免密码登录脚本

一、准备工作。

安装python（已安装可忽略）

yum install python

安装pip
yum install python-pip

安装 pexpect3.3
pip install pexpect==3.3

生成公钥 ssh-keygen

二、执行脚本

#!/usr/bin/env python
# -*- encoding:utf8 -*-
import sys, os, io
import pexpect

argc = len(sys.argv)
if (argc != 2):
        os._exit(1)

ip = sys.argv[1]

user = 'root'
password = '123456'
loginPrompt = '[$#>]'
cmd = 'ssh-copy-id -i /root/.ssh/id_rsa.pub ' + user + '@' + ip
ssh_newkey = 'Are you sure you want to continue connecting (yes/no)?'
success = 'Now try logging into the machine'

child = pexpect.spawn(cmd)
index = child.expect([success, ssh_newkey, 'password: ', pexpect.TIMEOUT, pexpect.EOF])
if (index == 0):
    print "Success!!"
elif (index == 1):
    child.sendline("yes")
    index = child.expect(['assword:', pexpect.TIMEOUT, pexpect.EOF])
    if (index == 0):
        child.sendline(password)
        index = child.expect([success, pexpect.TIMEOUT, pexpect.EOF])
        if (index == 0):
                print "Success!!"
elif (index == 2):
    child.sendline(password)
    index = child.expect([success, pexpect.TIMEOUT, pexpect.EOF])
    if (index == 0):
        print "Success!!"
else:
    print "Connection Error!"
    os._exit(1)
child.close(force=True)

执行完脚本后再登录该机器就不需要再输入密码。