python paramiko ssh linux服务器 提示鉴权失败

Posted 2023-04-20

bash shell ssh到目标服务器正常。但是使用python 的paramiko 就提示paramiko.ssh_exception.AuthenticationException: Authentication failed.
试验了很多方法，都不行 用户名 密码是正确的，请协助

是因为通过exec_command(cmd）执行的命令python /TextBoxes/demo.py 是在默认的环境下运行的，也就是主目录下，而不是我的家目录下，因此我将执行python环境换成绝对路径

**/path/anaconda2/bin/python**
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，这样改之后我以为万事大吉了，没想到又出现ImportError: libcudnn.so.6: cannot open shared object file: No such file or directory这个问题，这里是由于cuda没有加入到自己的环境中，这里我在~/.bashrc中加入了如下代码

export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/usr/local/cuda/lib64:/usr/local/cuda/extras/CUPTI/lib64"
export CUDA_HOME=/usr/local/cuda
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！ 参考技术A 在ssh 连接参数中新增allow_agent=False, look_for_keys=False即可用解决问题
ssh.connect(hostname=ip, username=user, password=passwd, allow_agent=False, look_for_keys=False)

python ssh之paramiko模块使用

1.安装:

sudo pip install paramiko

2.连接到linux服务器

方法一:

#paramiko.util.log_to_file(‘ssh.log‘) #写日志文件
client = paramiko.SSHClient()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) #允许连接不在~/.ssh/known_hosts文件中的主机
client.connect(‘ip‘,22, ‘username‘,‘password‘)  #指定ip地址,端口,用户名和密码进行连接

方法二:

transport = paramiko.Transport((‘ip‘, port)) #获取连接
transport.connect(username=‘username‘,password=‘password‘)
ssh = paramiko.SSHClient()
ssh._transport = transport

3.用transport实现上传下载以及命令的执行

 

# coding=utf-8
import paramiko

class SSHConnection(object):
    def __init__(self, host, port, username, password):
        self._host = host
        self._port = port
        self._username = username
        self._password = password
        self._transport = None
        self._sftp = None
        self._client = None
        self._connect()  # 建立连接

     def _connect(self):
        transport = paramiko.Transport((self._host, self._port))
        transport.connect(username=self._username, password=self._password)
        self._transport = transport

    #下载
    def download(self, remotepath, localpath):
        if self._sftp is None:
            self._sftp = paramiko.SFTPClient.from_transport(self._transport)
        self._sftp.get(remotepath, localpath)

    #上传
    def put(self, localpath, remotepath):
        if self._sftp is None:
            self._sftp = paramiko.SFTPClient.from_transport(self._transport)
        self._sftp.put(localpath, remotepath)

    #执行命令
    def exec_command(self, command):
        if self._client is None:
            self._client = paramiko.SSHClient()
            self._client._transport = self._transport
        stdin, stdout, stderr = self._client.exec_command(command)
        data = stdout.read()
        if len(data) > 0:
            print data.strip()   #打印正确结果
            return data
        err = stderr.read()
        if len(err) > 0:
            print err.strip()    #输出错误结果
            return err

    def close(self):
        if self._transport:
            self._transport.close()
        if self._client:
            self._client.close()


if __name__ == "__main__":
    conn = SSHConnection(‘192.168.87.200‘, 22, ‘username‘, ‘password‘)
    localpath = ‘hello.txt‘
    remotepath = ‘/home/hupeng/WorkSpace/Python/test/hello.txt‘
    print ‘downlaod start‘
    conn.download(remotepath, localpath)
    print ‘download end‘
    print ‘put begin‘
    conn.put(localpath, remotepath)
    print ‘put end‘

    conn.exec_command(‘whoami‘)
    conn.exec_command(‘cd WorkSpace/Python/test;pwd‘)  #cd需要特别处理
    conn.exec_command(‘pwd‘)
    conn.exec_command(‘tree WorkSpace/Python/test‘)
    conn.exec_command(‘ls -l‘)
    conn.exec_command(‘echo "hello python" > python.txt‘)
    conn.exec_command(‘ls hello‘)  #显示错误信息
    conn.close()