[RFE] export-bundle should have an option to export bundle with current machine code

[Pedro Guimarães]

Hi,

Juju 2.7.0

We are running a change with Juju on a live cloud and we are seeing that following the procedure:

(1) export bundle from UI
(2) change the bundle (45 machines exported, from 0 to 44)
(3) juju deploy bundle.yaml --dry-run

It will complain that juju has machines like "machine #180" because, actually that machine had been removed and readded during cloud life-cycle, but it corresponds to one of the machines ranging from 0 to 44 on the exported bundle.

Juju should have a native way to route it back between a recently exported bundle and actual juju status.

My suggestion: export-bundle and exported bundles from UI should have the machine-id at the moment, not the original bundle's machine-id.

Otherwise I need to run:

juju deploy my-recent-exported-bundle.yaml --map-machines=<ALL_THE_MACHINES_REMAPPED>

[Richard Harding (rharding)]

Thanks, I can see a case for a known environment wanting something like a --keep-machine-nums or something that would have it specific setup.

I do argue that we're abusing the bundles in this way to handle changes and I think it's a gap that we should fill in a better way.

[Pedro Guimarães (pguimaraes)]

Hi rharding, yes I don't think that is 100% of the cases. Some times we just want to recover the original bundle to deploy somewhere else.

This case fits an operational task of running a big replacement, which cannot be easily done with charms (upgrade, configs, actions, etc). The real example I have: removing a charm that upgrade-charm functionality is broken or does not exist. Remove it and reinstall the newest (fixed) charm.

The easiest way would be: (1) pull the bundle with actual machine-ids; (2) remove the old charm; (3) change the bundle to have the new charm version; and (4) redeploy with that bundle.

[Canonical Juju QA Bot (juju-qa-bot)]

This bug has not been updated in 2 years, so we're marking it Low importance. If you believe this is incorrect, please update the importance.