paramiko远程密码连接、批量连接主机

一、paramiko远程密码连接

题目要求：

基于ssh用于连接远程服务器做操作：远程执行命令

代码块：

import paramiko

#创建一个ssh对象
client = paramiko.SSHClient()
"""
The authenticity of host '172.25.254.254 (172.25.254.254)' can't be established.
ECDSA key fingerprint is 4c:98:51:43:65:46:66:fd:af:5b:ea:cc:d9:97:c0:74.
Are you sure you want to continue connecting (yes/no)?
"""
#自动选择yes
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

#连接服务器
client.connect(
    hostname='172.25.254.110',
    username='root',
    password='redhat'
)

#执行操作
#标准输入 标准输出 标准错误
stdin,stdout,stderr = client.exec_command('route -n')

#获取命令的执行结果
print(stdout.read().decode('utf-8'))

#关闭连接
client.close()

程序及运行结果：

二、paramiko批量连接主机

题目要求：

批量连接主机，若能连接请获取主机名，若不能请返回错误原因

操作如下：
为了获取批量的主机ip、用户一及用户密码，我们可以将其写在一个文件中，为方便获取，如下所示：

代码块：

from paramiko.ssh_exception import NoValidConnectionsError,AuthenticationException

def connect(cmd,hostname,user,password):
    import paramiko

    client = paramiko.SSHClient()

    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    try:
        client.connect(
            hostname=hostname,
            username=user,
            password=password
        )
        stdin, stdout, stderr = client.exec_command(cmd)
        a = stdout.read().decode('utf-8')
        print(stdout.read().decode('utf-8'))
        return a
    except NoValidConnectionsError as e:
        return '主机%s连接失败' %(hostname)
    except AuthenticationException as e:
        return '主机%s密码错误' %(hostname)
    except Exception as e:
        return '未知错误:',e

    finally:
        client.close()

with open('/tmp/hosts') as f:
    for line in f:
        hostname,username,password = line.strip().split(':')
        res = connect('hostname',hostname,username,password)
        # print(hostname.center(50,'*'))
        print('主机名:', res)

程序及运行结果：