local provider LXC network bridge name not configurable

[Eric Williams]

Environment:

ubuntu precise 12.04
juju-core 1.14.1 (ppa:juju-core/stable)
local provider

environments.yaml:
----
default: local

environments:
    local:
        type: local
        admin-secret: ceb8d811a6e225e8d1608f403dc8cbe1
        # Override the directory that is used for the storage files and database.
        # The default location is $JUJU_HOME.
        # $JUJU_HOME defaults to ~/.juju
        # root-dir: ~/.juju/local
        # Override the storage port if you have multiple local providers, or if the
        # default port is used by another program.
        # storage-port: 8040
        # Override the shared storage port if you have multiple local providers,
        # or if the default port is used by another program.
        # shared-storage-port: 8041

---

- juju bootstrap fails with the following error LXC bridge is not named "lxcbr0"

eric@macmini:~$ sudo juju -v bootstrap
2013-09-25 14:19:46 INFO juju.provider.local environprovider.go:32 opening environment "local"
2013-09-25 14:19:46 ERROR juju.utils network.go:37 cannot find network interface "lxcbr0": net: no such interface
2013-09-25 14:19:46 ERROR juju.provider.local environprovider.go:48 failure setting config: net: no such interface
2013-09-25 14:19:46 ERROR juju supercommand.go:282 command failed: net: no such interface
error: net: no such interface

- LXC containers can be created normally, but juju fails with "net: no such interface"

Being able to specify the LXC bridge name in the environment file would allow juju to function in non-default LXC network configurations.

Use case for this is for connecting Juju-orchestrated services to network bridges that aren't named 'lxcbr0'.

Steps to reproduce:

1. edit /etc/default/lxc and /etc/lxc/lxc.conf to point LXC instances at virbr0 (or any other existing bridge)
2. test with 'lxc-create -n virbr-test -t ubuntu -- -r precise
3. create environments.yaml:

default: local

environments:
    local:
        type: local
        admin-secret: ceb8d811a6e225e8d1608f403dc8cbe1

4. sudo juju -v bootstrap

Expected results:
juju uses default lxc configuration for network bridge name (or is configurable in environments.yaml)

Actual results:
juju fails with error "lxcbr0: net: no such interface"

Thanks,
Eric

[John A Meinel (jameinel)]

I think this would let you set up your own br0 and bridge the local containers onto the general network, which could be pretty useful.