[Enhancement] Support multiple CRC machines

[mkeeler]

Component

None

Is your enhancement related to a problem? Please describe

Sometimes I need to switch between different bundles corresponding to different OpenShift versions I want to develop against. Currently this process isn't great as I have to delete the existing crc machine and recreate it with the different bundle.

Describe the solution you'd like

I would like the CLI and internals to be updated to support configuration and management of multiple CRC machines.

• crc start - starts the default/first machine
• crc start --machine <machine name> - start a named machine
• crc machine * - more or less I would want the CLI of podman machine replicated for crc machine management.

Some design related questions I don't have strong opinions about:

• Should crc prevent running concurrently? Probably given the existing network setup which binds to 127.0.0.1 with constant ssh/api ports. Ideally the ports and IP address could be altered to allow using non-loopback addresses but that feels like it would make this particular request a lot bigger in scope.
• Should crc machine configurations be entirely independent or inherit from a global config and require overrides?

Describe alternatives you've considered

Deleting and recreating machines does work but I lose all state

Additional context

No response

[praveenkumar]

@mkeeler Since CRC with openshift preset required significant amount of resources (mem/cpu/storage). Most of the user even have hard time to run single instance of it, supporting multiple instances would not be beneficial for our users. Do you have any specific usecase for this requirement?

[mkeeler]

@praveenkumar For me its not about running two CRC instances simultaneously but rather having two distinct CRC instances that can be stopped/started.

If developing for OpenShift 4.17 in production but want to test out the solution on 4.19 for an upcoming upgrade/migration, this requires different bundles/machines with crc. I may need to switch back and forth and I don't necessarily want to recreate everything each time. It would be great if the disk image and configuration could remain on-disk unchanged while CRC allows me to swap between the different images as needed.