[cs615asa] HW#6 Question 1

[Tianxiao Yang]

Got it. Thank you.
On Sun, Apr 9, 2017 at 16:43 Jan Schaumann <jschauma at stevens.edu> wrote:

> Tianxiao Yang <tyang8 at stevens.edu> wrote:
>
> > "$ afewmore i-0a1b2c3d4f" this command generated ten IDs, but one of
> > them is the original ID itself, there are only 9 newly generated IDs.
> > Do we need to count the source instance itself as newly generated
> > instance?
>
> No.  The example output was wrong, I have updated the manual page:
>
> $ afewmore i-0a1b2c3d4f
> i-1a1b2c3d4f
> i-2a1b2c3d4f
> i-3a1b2c3d4f
> i-4a1b2c3d4f
> i-5a1b2c3d4f
> i-6a1b2c3d4f
> i-7a1b2c3d4f
> i-8a1b2c3d4f
> i-9a1b2c3d4f
> i-0b1b2c3d4f
> $
>
>
> > 2.
> >
> >      -d dir   Copy the contents of this data directory from the orignal
> source
> >               instance to all the new instances.  If not specified,
> defaults
> >               to /data.
> >
> > By default(-d not specified), source data directory should be /data, but
> in the example below:
> >
> >      To create just one more instance and copy the contents of the
> directory
> >      '/usr/local/share':
> >
> >            $ afewmore -n 1 i-0a1b2c3d4f
> >            i-1a1b2c3d4f
>
> This example invocation was missing the '-d' flag.  I've updated the
> manual page:
>
> $ afewmore -d /usr/local/share -n 1 i-0a1b2c3d4f
> i-1a1b2c3d4f
>
> > User who uses afewmore cannot chose the directory to which the contents
> of source data should be copied.
> > -- Can we just copy the source data to home directory of newly created
> instance?
>
> No, the objective is to create a clone or copy of the original instance,
> so the data from the source needs to be copied into the same location on
> the destination instance(s).
>
> > -- If we need to copy the /data directory from source instance A to
> > the /data directory in newly created instance B(doesn't have a /data
> > directory), we usually need to execute the operation as superuser for
> > instance B. How could we know the what is the superuser command(sudo
> > or yum etc.)?
>
> You need to work as the super user on both instances.  Given how
> different EC2 instances handle user logins and superuser access, you
> probably need to have an internal mapping of OS to correct user / access
> method.
>
> > -- If /data directory in A is a mount point for a filesystem, do we need
> to create the same filesystem in B and mount it to the same directory?
>
> I think that's not necessary.  While that would be useful, I suspect
> it'd make the assignment overly complicted.  To simplify, you may ignore
> differences in partitions.
>
> -Jan
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