paramiko 实现远程切换root

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# 远程执行docker 命令 def exec_cod(host, username, password, port, root_pwd, image_count, cmd, cmd2):     s = paramiko.SSHClient()     s.load_system_host_keys()     s.set_missing_host_key_policy(paramiko.AutoAddPolicy())     s.connect(hostname=host, port=int(port), username=username, password=password)     if username != 'root':         ssh = s.invoke_shell()         time.sleep(0.1)         ssh.send('su - \n')         buff = ''         while not buff.endswith('Password: '):             resp = ssh.recv(9999)             buff += resp.decode('utf-8')         ssh.send(root_pwd)         ssh.send('\n')         buff = ''         while not buff.endswith('# '):             resp = ssh.recv(9999)             buff += resp.decode('utf-8')         if host == '10.210.0.71' or host == '10.210.0.73':             ssh.send('docker-compose -f /home/ubuntu/ruo/docker-compose.yml scale php=' + str(image_count))         else:             ssh.send('docker-compose -f /root/ubuntu/ruo/docker-compose.yml scale php=' + str(image_count))         ssh.send('\n')         buff = ''         while not buff.endswith('# '):             resp = ssh.recv(9999)             buff += resp.decode('utf-8')         print(buff)         if host == '10.210.0.71' or host == '10.210.0.73':             ssh.send('docker-compose -f /home/ubuntu/ruo/docker-compose.yml restart')         else:             ssh.send('docker-compose -f /root/ubuntu/ruo/docker-compose.yml restart')         ssh.send('\n')           buff = ''         while not buff.endswith('# '):             resp = ssh.recv(9999)             buff += resp.decode('utf-8')         print(buff)         ssh.send('docker ps')         ssh.send('\n')         buff = ''         while not buff.endswith('# '):             resp = ssh.recv(9999)             buff += resp.decode('utf-8')         s.close()         result = buff         print(buff)     else:         pass         # stdin, stdout, stderr = s.exec_command(cmd)         # result = stdout.read()         # s.close()     return result