简单执行命令可用以下方式：

connection = paramiko.SSHClient()

connection.set_missing_host_key_policy(paramiko.AutoAddPolicy())

connection.connect(hostIP, 22, 'd', 'd')

command = 'xxxx'

stdin, stdout, stderr = connection.exec_command(command)

respmsg = stdout.read()

但是如果执行多条命令，则会报错paramiko.ssh_exception.SSHException: Unable to open channel.

命令执行完后，channel关闭，所以报错。（http://docs.paramiko.org/en/1.15/api/channel.html）可使用如下方式。

connection = paramiko.SSHClient()

connection.set_missing_host_key_policy(paramiko.AutoAddPolicy())

chan = connection.invoke_shell()

resp = chan.recv(9999)

commands = [xxxxxxxxxxx]

for command in commands:

    chan.send(command + '\r\n')

    time.sleep(1)

    resp = chan.recv(999999)

    print resp