[cs615asa] ssh configurations

[John Wierzchowski]

hmm for backup what should we do if the instance and volume are specified ,
and that volume is already attached ( and mounted even?) to that instance?
or should we just throw an error if the volume is mounted anywhere? (which
is what i am doing atm, well actually i cycle through all volumes with the
tag, until an available one is found, if no available one is found then i
echo on stderr " no available volumes"  and exit 1 )

so is the way im doing it now acceptable

or should I check that if it is attached then to where and if that is the
instance I want to attach it to i can skip the step and use it

(and no matter what i should not unmount and detach from
another instance right?)

p.s.
super sorry for the last minute questions on

On Sat, Mar 26, 2011 at 6:09 PM, John Wierzchowski <jwierzch at stevens.edu>wrote:

> OOPs thanks I totally skipped that :/ Gatta go back to start instance
> now....
>
> Is it wrong to not use ec2-start-instance in ec2-backup? It may be the case
> as with the run instances flags variable, but i didn't see the assignment
> requiring we use the one tool in the other....
>
>
> On Sat, Mar 26, 2011 at 5:22 PM, Jan Schaumann <jschauma at cs.stevens.edu>wrote:
>
>> John Wierzchowski <jwierzch at stevens.edu> wrote:
>>
>> > So just a quick clarification, we are assuming that the ssh config
>> exists
>> > and is configured for all the instances right? so when we ssh we just
>> need
>> > the address of the client not the key not root@ correct? or should we
>> > account for it not being configured? I started this whole mess of code
>> with
>> > the assumption of no ssh config. I mean now that Im thinking about it i
>> > guess we can tell from the first ssh call...
>>
>> You can assume that the user has his ~/.ssh/config set up to allow
>> connections to all amazon ec2 instances to work without any additional
>> options.  The following is really all that one needs to set:
>>
>> Host *.amazonaws.com
>>        IdentityFile            ~/aws/aws-ec2.pem
>>        User                    root
>>        UserKnownHostsFile      /dev/null
>>        StrictHostKeyChecking   no
>>
>> It'd probably be useful to allow the user to specify any additional
>> options via an environment variable, say EC2_SSH_OPTS, so that the user
>> can override any such options if so desired.
>>
>> > also in this case when we create a new instance, we need to supply a
>> key,
>> > should we go to ssh/config to get this key? or is it allright to make a
>> key
>> > and store it in EC2_HOME?
>>
>> The assignment specifies:
>> http://www.cs.stevens.edu/~jschauma/615A/ec2-start-instance.1.html#sect7
>>
>> | ec2-start-instance allows the user to add custom flags to the
>> | ec2-run-instances(1) command via the EC2_RUN_INSTANCES_FLAGS environment
>> | variable. If this variable is not set, ec2-start-instance will not
>> | append any flags to the command besides -a ami.
>>
>> -Jan
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>>
>
>
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