paramiko的简单使用

1.封装

近期工作中需要从一个服务器上执行某些脚本，所以需要ssh到该服务器执行命令，paramiko就是一个很不错的选择

为了方便使用，以下是简单的封装

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import paramiko     class ParamikoSftp:     def __new__(cls, *args, **kwargs):         if not hasattr(cls, '_instance'):             cls._instance = super(ParamikoSftp, cls).__new__(cls)         return cls._instance       def __init__(self, ip, port, username, password):         self.transport = paramiko.Transport((ip, port))         self.transport.connect(username=username, password=password)         self.sftp = paramiko.SFTPClient.from_transport(self.transport)         self.client = paramiko.SSHClient()         self.client._transport = self.transport       def put(self, local_file, remote_path):         try:             self.sftp.put(local_file, remote_path)             return True, None         except Exception as e:             return False, repr(e)       def get(self, remote_path, local_path):         try:             self.sftp.get(remote_path, local_path)             return True, None         except Exception as e:             return False, repr(e)       def exec_command(self, cmd):         try:             _, stdout, stderr = self.client.exec_command(cmd)             return stdout.read().decode('utf-8'), stderr.read().decode('utf-8')         except Exception as e:             print("error", e)             return False, repr(e)       def close(self):         self.sftp.close()         self.client.close()         self.transport.close()

　　

2.执行长时间任务

有些脚本是需要执行很长时间的，比如说几个小时那种，直接调用exec_command()的话它会等待脚本执行完的，所以我们需要使用nohup命令让它后台执行

例如

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paramiko_sftp = ParamikoSftp(**finance_ssh_config)  # 通过配置实例化对象 cmd_python = "nohup python /xxx/main.py > /xxx/nohup.out 2>&1 &" stdout, stderr = paramiko_sftp.exec_command(cmd_python)