从 python paramiko 获取标准输出的问题

Question

我正在尝试使用 paramiko 和 AWS，但无法让 SSH 正常工作。当我手动 SSH 到服务器并且我没有收到任何错误消息时，它可以工作。我可以帮我弄清楚我做错了什么吗？

我已经尝试过 stdout.read() 和 stdout.readlines()。两者都是空的。

代码：

#Load the key into a file and attempt to SSH in
key = paramiko.RSAKey.from_private_key_file('TestInstanceKey.pem')
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
print("Connecting")
#Try to ssh in and run and display ifconfig
try:
    ssh.connect(hostname=instance.public_ip_address, username="ec2-user", 
    pkey=key)
    print("Connected")
    print("Executing ifconfig")
    stdin, stdout, stderr = ssh.exec_command("ifconfig")
    lines = stdout.read()
    print(lines)
    for line in lines:
        print(line)
    ssh.close()
except Exception as e:
    print(e)
    input("Press enter to continue...")

输出：

Connecting
Connected
Executing ifconfig
b''

当我通过 SSH 连接到服务器时的输出：

ssh -i TestInstanceKey.pem ec2-user@XXXXXXXXXX

       __|  __|_  )
       _|  (     /   Amazon Linux AMI
      ___|\___|___|

https://aws.amazon.com/amazon-linux-ami/2016.09-release-notes/
22 package(s) needed for security, out of 67 available
Run "sudo yum update" to apply all updates.
Amazon Linux version 2017.09 is available.
[ec2-user@ip-XXXXXXXXX ~]$ ifconfig
eth0      Link encap:Ethernet  HWaddr XXXXXXXXXXX 
          inet addr:XXXXXXXXX  Bcast:Xxxxxxxxx.255  Mask:255.255.240.0
          inet6 addr: xxxxxxx Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:9001  Metric:1

Answer 1

我需要做完整的路径。所以 /sbin/ifconfig 不仅仅是 ifconfig。