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Need a CLI program to implement cloud level reentrancy protection

fr flag

I have a kubernetes system which must run rake db:migrate before deployment. For reasons, we'd like to do this as an init container instead of a job.

This seems like a more general class of program of "how do I make sure only one of these commands is running at a time, across an entire cloud?"

My thought is to use dynamodb, redis, or similar shared NOSQL solution to implement a lock.

Does anyone know of a tool that does this, before I have to write one?

TIA

in flag
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