CRPQCheck

CRPQ Checkpointing System for AWS is a php/python environment for checkpointing and restoring instances on AWS. It is based around the follow scripts:

• cron_checkpoint.php This script is triggered periodically by a cron job and check the SQL database to see if an instance needs to be checkpointed. If it detects an instance which needs to be checkpointed it attachs a volume to the instance, triggers the local checkpointing script (checkpointProcess.py) and creates an AMI of the instance
• cron_restore.php This script is triggered periodically by a cron job and checks if an instance which should be active (via the database) have failed and restores the instance by starting a new instance attaching the volume which contains the process memory and running the restore scripts (restoreProcess.py and restoreDocker.py)
• CRPQ.php This script triggers checkpoints periodically based upon a queueing system which uses probability of failure and cost of the instance as inputs. Checkpoints are triggered via the SQL database
• checkpointProcess.py This script checkpoints local processes using CRIU
• restoreProcess.py This script restores local processes using CRIU
• restoreDocker.py This script restores local Docker Containers using CRIU Experimental
• configuration_checkpoint.php This file contains configuration information for the database, mailing system and AWS
• criu_ssh_restore_expect.sh Bash script for polling an instance to determine if it has been restored so the restoreProcess.py script can be triggered.

CRIU is used for the checkpointing and restoration of processes.