[library] Reduce time of bootstrapping of master node

[Mike Scherbakov]

Currently it takes about 45 min to bootstrap master node on VM. It is > 2x time consuming than it was before. Let's invent a way to reduce the time.

[Bogdan Dobrelya (bogdando)]

IMHO, we should at least increase master vm CPU to 2 and RAM to 2-4G

[Mike Scherbakov (mihgen)]

We need to measure and compare, it is unclear what do we stuck with: cpu, ram, disk? Anything we could refactor to make a faster pass?

[Matthew Mosesohn (raytrac3r)]

The biggest two pieces are docker load and uncompressing lrz archive.

I believe we can shorten this time a bit if we move docker containers into a local docker registry that gets packed up. It will import into docker much faster than tar does, and the duplicated layers will not take so long to import as they do now. This 45 minute speed is a lot higher than I've ever timed. The typical time is 14-16 minutes.

I agree we should mark this critical for 5.1, but we're not going to get any miracles for 5.0

[Matthew Mosesohn (raytrac3r)]

merged https://review.openstack.org/#/c/97836/ resolves this