[cs615asa] Question about ssh in python

[Dainong Ma]

Thank you very much, I make it work by making the sleep time longer.


On Mon, Mar 31, 2014 at 12:10 AM, Nicholas Bevacqua <nbevacqu at stevens.edu>wrote:

> I had similar issues. Depending on Amazon, it can take far longer than 45
> seconds for the instance to be ready. Your best approach is to do what I
> did and fetch both the system status and the instance status. When both are
> 'Status:ok', then it is safe to connect. You can do this in boto like so:
>
> status = conn.get_all_instance_status(instance_ids=[instance.id])[0]
> currentSystemStatus = str(status.system_status)
> currentInstanceStatus = str(status.instance_status)
> if (currentSystemStatus != 'Status:ok') or (currentInstanceStatus !=
> 'Status:ok'):
>     ...
>
> -Nick Bevacqua
>
>
> On Sun, Mar 30, 2014 at 11:44 PM, Paul-Anthony Dudzinski <
> pdudzins at stevens.edu> wrote:
>
>> Can you connect via ssh BEFORE you pass that command programattically? If
>> that is the case you might have a problem with the filepath expansion of
>> "~", otherwise if this only works after you may just not be able to connect
>> yet.
>>
>>
>> On Sun, Mar 30, 2014 at 11:32 PM, Dainong Ma <dma2 at stevens.edu> wrote:
>>
>>>
>>> Hello everyone, I have a problem using python to connect ec2-instance.
>>> I write this in python so that I can connect to ec2-instance but I get a
>>> connection refused. I can be sure that I use correct KeyPair and
>>> SecurityGroup. And also I let my program time.sleep(45)
>>> after creating instance.
>>>
>>>            command ="ssh -i %s -o StrictHostKeyChecking=no %s@%s"%(KEYPAIR_LOCATION,
>>> INSTANCE_LOGIN_USR, EC2_HOST)
>>> output: mountvolume (65280, 'ssh: connect to host
>>> ec2-54-208-77-230.compute-1.amazonaws.com port 22: Connection
>>> refused\r')
>>>
>>> But when I ssh from command line right after that moment:  ssh -i
>>> ~/.ssh/ec2backup-keypair.pem -o StrictHostKeyChecking=no
>>> ec2-user at ec2-54-208-77-230.compute-1.amazonaws.com, I can connect it.
>>>
>>> Does that mean I can not write ssh command in python like that?
>>>
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>>>
>>
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>
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