Process HAULer -- a tool to live-migrate containers and processes
The live-migration idea is quite simple. To live migrate a task one needs to
- stop it and save its state into image file(s)
- make images available on the remote host
- recreate task on it from the images
This is what p.haul does. It heavily uses CRIU (http://criu.org) to do state dump and restore. Task's stopped time is decreased using the CRIU's pre-dump action.
Get p.haul ready
Install criu or put criu binary location to $PATH.
Install protobuf-compiler and python-protobuf packages.
Install p.haul by running $ python setup.py install or just use it without installing.
For more information read the P.Haul-related pages on the CRIU wiki (http://criu.org/Category:P.Haul).
How to contribute
The p.haul patches should be sent to CRIU development mailing list (https://openvz.org/mailman/listinfo/criu) with "p.haul" prefix. Configure your local git repository using following command to set subject prefix automatically:
- $ git config format.subjectprefix "PATCH p.haul"
Before sending patches please make sure your code formatted according to project coding style (we use PEP8 with some exceptions) and your changes don't introduce linter warnings.
How to run flake8 linter to verify p.haul:
- $ yum install python-setuptools
- $ easy_install pip
- $ pip install flake8
- $ make lint