cc-proxy/cc-shim high availability

[sameo]

From @sameo on December 2, 2016 17:36

If cc-proxy crashes:

1. all cc-shim instances terminate.
2. cc-proxy will not be able to restore its internal state after restarting.

We need to work on:

1. Have cc-shim retry connecting to the proxy when the socket is closing/disappearing
2. Have cc-proxy re-build all its states when restarting, based on the stored information

Copied from original issue: intel/cc-oci-runtime#505

[sameo]

From @laijs on December 4, 2016 23:46

the virtio-serial is not package based transport, it seams hard to find the message header when cc-proxy re-connect to hyperstart.

[dvoytik]

Hi @dlespiau, are you doing anything related to this feature? If not then I'd like to hack on this if you don't mind.

[dlespiau]

Hi,

I'm doing the low level part of this, framing on top of the Host<->VM serial link so the proxy can recover the start of a frame when reconnecting to a running VM.

I haven't started on the task to save an on-disk state that the proxy can read from when starting again though. You could take that part.

[dvoytik]

Hi @dlespiau,

That's awesome!
I've started experimenting exactly with on-disk re/store of the state as it's most obvious part for me. Okay. When I have something substantial to show I'll post here a WIP PR.

Cheers.

[jodh-intel]

Thanks @dvoytik! Feel free to create an issue and assign to yourself (and maybe reference this issue) so it's clear to the whole team that that is something you're working on.

[dvoytik]

@jodh-intel, done. Although I can't assign it to myself.

[jodh-intel]

@dvoytik - thanks - assigned.