Juju 2.x bootstrap on LXD broken (regular bridge, no NAT)

[Toubeau, Anthony]

Hello all,

I'd like to bring to your attention a currently broken bootstrapping scenario:
Local deployment through LXD using a standard bridge instead of the usual LXD provided lxdbr0.

As a development vehicle, a Juju install was planned reusing the LXD-host's network. This implies having the Juju agent plus the future charms on the same subnet as the actual LXD host.
As detailed in Bug 1633788 (https://bugs.launchpad.net/juju/+bug/1633788), the LXD-host's gateway is assumed (based on the current code) to be providing the tools for the actual bootstrapping.

But, in the "non-lxdbr0" case let's say, the actual gateway may only be a simple DHCP provider for example, hence leading to a failed deployment.

Reference: https://github.com/juju/juju/blob/staging/provider/lxd/environ_raw.go#L140

// getRemoteConfig returns a lxdclient.Config using a TCP-based remote
// if called from within an instance started by the LXD provider. Otherwise,
// it returns an errors satisfying errors.IsNotFound.
func getRemoteConfig(readFile readFileFunc, runCommand runCommandFunc) (*lxdclient.Config, error) {
    [...]

    // Read here...
    hostAddress, err := getDefaultGateway(runCommand)

    [...]
    return &lxdclient.Config{
        lxdclient.Remote{
            Name:          "remote",
            Host:          hostAddress,
            [...]
        },
    }, nil


Is this behavior an assumed trend or could we consider fixing it to allow this sort of "localhost-based" deployments without NAT?

Many thanks in advance,
Anthony
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