South from running two migrations at the same time!Let's prevent
A common situation in continuous integration/deployment scenarios is having production code pushed to a number of servers at once without any type of "master" controller. All servers are treated equally. In this case when mixed with South, migrations can get crazy. Only one migration instance can run at one time. This lets you do that.
$ pip install django-locking-south
locking_south to your
INSTALLED_APPS = ( #... 'south', 'locking_south', )
Cache must be configured inside your Django app and be accessible by all servers for locking to actually work.
$ ./manage.py safe_migrate
Note: All options and args for South are passed through and valid for