<div dir="ltr">Ok, that makes sense. <div><br></div><div>Like the last assignment, for creating an ec2 instance, should we assume a default aws key name of 'ec2-backup'?</div><div><br></div><div>-Justin</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 2, 2019 at 3:11 PM Jan Schaumann <<a href="mailto:jschauma@stevens.edu">jschauma@stevens.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Justin Barish <<a href="mailto:jbarish@stevens.edu" target="_blank">jbarish@stevens.edu</a>> wrote:<br>
> If the user in the EC2_BACKUP_FLAGS_SSH changes their ssh key<br>
> to something different, would they also change the --key-name in<br>
> EC2_BACKUP_FLAGS_AWS to match, or would we have to manually do that?<br>
> <br>
> (And regardless, if they give a key-name in EC2_BACKUP_FLAGS_AWS<br>
> that doesn't match the one in EC2_BACKUP_FLAGS_SSH,<br>
> should we throw an error, or ignore their provided --key-name)<br>
<br>
You cannot make assumptions about the names of the keys. There is no<br>
requirement that a key named "bob" in AWS matches a file named "bob" on<br>
the local system. I can create a key pair and have the key in AWS be<br>
identified as "fritz" and save the private key on my local system as<br>
"bob"; what's more, I can later choose to rename the file to "jenny".<br>
<br>
Fortunately for you, this simplifies things rather than making things<br>
more complicated: you don't need to try to "verify" if keys used for SSH<br>
match the ones used for AWS. You will use whatever the user provides.<br>
If that works, great; if not, produce (or bubble up) a meaningful<br>
error to the user. But in the face of ambiguity, resist the temptation<br>
to guess: tell the user that e.g., ssh didn't work, but don't try to<br>
speculate "you provided a key that doesn't match the key in AWS",<br>
because you don't know if that is the case or not.<br>
<br>
-Jan<br>
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