Date: Fri, 20 Nov 2020 22:01:38 +0900 From: SQP Admin <admin@...lus.net> To: john-users@...ts.openwall.com Subject: Session management on AMI - Interrupting and resuming Hi, We are currently running an Openwall Amazon AMI, running an incremental session on a ZIP archive. We have chosen to go with a c5.24xlarge infrastructure and using multiple CPU threads like so: john —session=XX —incremental=Alnum —fork=96 xxxx.hash We are in a situation where we expect getting a correct guess will take some time and also have budget restrictions. We understand sessions can be interrupted and resumed using the —restore=[sessionname] option. Here are my questions: 1. Is the approach we’ve taken to take advantage of the 96 CPUs correct? (—fork=96) - or is there a better way of leveraging that instance performance? 2. We had to logout from our ssh session a couple of times and don’t know how to reconnect to our John session. We understand using —status=[sessionname] prints a status of the relevant session, however is there a way to reconnect to the session as when it was launched the first time and when pressing any key would display the status? 3. As we are not connected to the John session anymore, we are unable to figure out how to interrupt it gracefully, as we would usually do using “q” when connected to a live session. Could you please advise on how to interrupt sessions after reconnecting to the instance’s ssh? 4. We are on monthly budget and are looking into the possibility of running our crack like so: - when budget is reached, interrupt the session, save .rec files locally and terminate the instance. - when a new budget is approved, launch a new similar instance, move back the .rec files to that instance and use the —restore command to resume it. Is this approach correct? If this works, we would need to understand how to interrupt a background session, as described in 3. Could you please advise? Thank you very much for your time and support. - Mike
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