[Python] paramiko's ssh channel closed after executing one cmd - Python

I'm using Python's Paramiko to execute commands in a remove server. The code is much simple.

Here's my definition of the SSHConn class:

class SSHConn:

def __init__(self, hostname, user, pwd, filename=None):
self.client = paramiko.SSHClient()
self.client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
self.client.connect(hostname, username=user, password=pwd,
key_filename=filename)
self.transport = self.client.get_transport()
self.channel = self.transport.open_session()


So I'm running the following code:

local_ssh = ssh.SSHConn(host, user, passwd)

cmds = ('foo', 'bar')
for cmd in cmds:
local_ssh.channel.exec_command(cmd)
self.log.info(local_ssh.channel.recv(1024))


However, when I execute the following code snipped I'm getting:

INFOaramiko.transport:Connected (version 2.0, client OpenSSH_6.6.1p1)
INFOaramiko.transport:Authentication (publickey) failed.
INFOaramiko.transport:Authentication (password) successful!
INFOaramiko.transport:Secsh channel 1 opened.
INFO:testsets.testcase:
ERROR:testsets.testcase:Channel is not open
Traceback (most recent call last):
File "/root/fds-src/source/test/integration-framework/testsets/testcases/test_100gb_volume.py", line 87, in runTest
local_ssh.channel.exec_command(cmd)
File "/usr/lib/python2.7/dist-packages/paramiko/channel.py", line 209, in exec_command
raise SSHException('Channel is not open')
SSHException: Channel is not open
ERROR:testsets.testcase:Test Case Test100GBVolume failed.
Traceback (most recent call last):
File "/root/fds-src/source/test/integration-framework/testsets/testcases/test_100gb_volume.py", line 87, in runTest
local_ssh.channel.exec_command(cmd)
File "/usr/lib/python2.7/dist-packages/paramiko/channel.py", line 209, in exec_command
raise SSHException('Channel is not open')
SSHException: Channel is not open


How can I keep the channel open?

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