[lxc-users] lxd: getting rid of the initial network interface

[Frans Meulenbroeks]

Hi,

I want to get rid of the network interface that my container has, but
somehow I can't figure out how to get that done.

I have created a new container from scratch with:
lxc launch ubuntu:14.04 my-ubuntu

lxc config show my-ubuntu gives;

architecture: x86_64
config:
  image.architecture: amd64
  image.description: ubuntu 14.04 LTS amd64 (release) (20170202.1)
  image.label: release
  image.os: ubuntu
  image.release: trusty
  image.serial: "20170202.1"
  image.version: "14.04"
  volatile.base_image:
3b825a6a063aacc6b19df84f7ddc4fe872a0e382ec0bb92f475a9493b0857e01
  volatile.eth0.hwaddr: 00:16:3e:25:48:06
  volatile.idmap.base: "0"
  volatile.idmap.next:
'[{"Isuid":true,"Isgid":false,"Hostid":231072,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":231072,"Nsid":0,"Maprange":65536}]'
  volatile.last_state.idmap:
'[{"Isuid":true,"Isgid":false,"Hostid":231072,"Nsid":0,"Maprange":65536},{"Isuid":false,"Isgid":true,"Hostid":231072,"Nsid":0,"Maprange":65536}]'
  volatile.last_state.power: RUNNING
devices:
  root:
    path: /
    type: disk
ephemeral: false
profiles:
- default


Note: no nic device, but there is a volatile.eth0.hwaddr address

And if I look into the container with lxc exec my-ubuntu --  ifconfig -a

eth0      Link encap:Ethernet  HWaddr 00:16:3e:25:48:06
          inet addr:10.202.122.138  Bcast:10.202.122.255  Mask:255.255.255.0
          inet6 addr: fe80::216:3eff:fe25:4806/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:95 errors:0 dropped:0 overruns:0 frame:0
          TX packets:74 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:19120 (19.1 KB)  TX bytes:7960 (7.9 KB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

And if I do lxc network show lxdbr0 I see that the container is using the
bridge.

$ lxc network show lxdbr0
config:
  dns.mode: dynamic
  ipv4.address: 10.202.122.1/24
  ipv4.dhcp.ranges: 10.202.122.2-10.202.122.254
  ipv4.nat: "true"
  ipv6.address: none
name: lxdbr0
type: bridge
usedby:
...
- /1.0/containers/my-ubuntu
...
managed: true


ButI cannot remove the device from the bridge:

lxc network detach lxdbr0 my-ubuntu
error: No device found for this network

Is there a way to get rid of this interface?

(actually I want to attach eth0 to a different bridge)

Thanks in advance!
Frans
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