Comment 0 for bug 1605749

cloud-init fails to configure bond interfaces from network_data.json

There is a couple of reasons:

Bond links found in network_data.json do not have a name attribute. cloud-init doesn't require the name attribute to exist in links. [1] However cloud-init later expects the links to have a name attribute and crashes when it doesn't have any. [2] The name attribute is not part of the OpenStack network_data.json specification and will therefore never be provided.

If a link name is provided, the generated ENI configuration has a couple of issues:

* cloud-init currently thinks that the bond_links attribute found in a bond link are actual physical interface names and not link id as expected.

This means you end up with 4 physical interfaces configured on the server: 2 existing physical interfaces (ex.: eno1 and eno2) and 2 physical interfaces based on the name found in bond_links (in that case, eth0 and eth1). The later don't exist on the server and configured bond interface tries to enslave non-existing links and fails to bring up.

* The "auto" stanza is missing from bond and bond slave interfaces. Interfaces are never started/configured properly at boot.

Here is attached to this bug a network_data.json for test purpose.

For reference, here is the MAC address mapping on the server:
- eno1: 0c:c4:7a:34:6e:3c
- eno2: 0c:c4:7a:34:6e:3d

Current rendered ENI is:

    auto lo
    iface lo inet loopback
        dns-nameservers 1.1.1.191 1.1.1.4

    iface eno1 inet manual
        mtu 1500

    iface eno2 inet manual
        mtu 1500

    iface bond0 inet manual
        bond_xmit_hash_policy layer3+4
        bond_miimon 100
        bond_mode 4
        bond-slaves none

    auto eth0
    iface eth0 inet manual
        bond_miimon 100
        bond-master bond0
        bond_mode 4
        bond_xmit_hash_policy layer3+4

    auto eth1
    iface eth1 inet manual
        bond_miimon 100
        bond-master bond0
        bond_mode 4
        bond_xmit_hash_policy layer3+4

    auto bond0.602
    iface bond0.602 inet static
        netmask 255.255.255.248
        address 2.2.2.13
        vlan-raw-device bond0
        hwaddress fa:16:3e:b3:72:30
        vlan_id 602
        post-up route add default gw 2.2.2.9 || true
        pre-down route del default gw 2.2.2.9 || true

    auto bond0.612
    iface bond0.612 inet static
        netmask 255.255.255.248
        address 10.0.1.5
        vlan-raw-device bond0
        hwaddress fa:16:3e:66:ab:a6
        vlan_id 612
        post-up route add -net 192.168.1.0 netmask 255.255.255.255 gw 10.0.1.1 || true
        pre-down route del -net 192.168.1.0 netmask 255.255.255.255 gw 10.0.1.1 || true

[1] http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/view/head:/cloudinit/sources/helpers/openstack.py#L547
[2] http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/view/head:/cloudinit/net/network_state.py#L284