/e/n/i.d/br0.config:
 
auto bond0
iface bond0 inet manual
 hwaddress ether d8:9d:67:15:9f:c0
 bond-miimon 100
 bond-mode 4
 bond-slaves none
 bond-xmit-hash-policy layer3+4

auto br0
iface br0 inet dhcp
 bridge_ports bond0
 
 dns-nameservers 162.213.32.1
 dns-search search internal canonical.com
 post-up ip link set bond0 mtu 1500
auto em1
iface em1 inet manual
 bond-master bond0
 bond-primary em1 em2
auto em2
iface em2 inet manual
 bond-master bond0
 bond-primary em1 em2


/e/n/i:

cat interfaces
# Added by bondsetup.sh via MaaS preseed
auto lo
iface lo inet loopback

source /etc/network/interfaces.d/*.config

preseed:

{{inherit "preseed_master"}}

{{def proxy}}
d-i     mirror/country string manual
{{if node.architecture in {'i386/generic', 'amd64/generic'} }}
d-i     mirror/http/hostname string {{main_archive_hostname}}
d-i     mirror/http/directory string {{main_archive_directory}}
{{else}}
d-i     mirror/http/hostname string {{ports_archive_hostname}}
d-i     mirror/http/directory string {{ports_archive_directory}}
{{endif}}
{{if http_proxy }}
d-i     mirror/http/proxy string {{http_proxy}}
{{else}}
d-i     mirror/http/proxy string http://{{server_host}}:8000/
{{endif}}
{{enddef}}

{{def client_packages}}
d-i     pkgsel/include string cloud-init openssh-server python-software-properties vim avahi-daemon ifenslave-2.6 lxc-templates server^
{{enddef}}

{{def preseed}}
d-i     passwd/user-password-crypted password *********************
{{preseed_data}}
{{enddef}}

{{py:
def tagnames(n):
    tn = []
    for tag in n.tags.all():
    	tn.append(tag.name)
    return tn
}}

{{def post_scripts}}
# Executes late command and disables PXE.
d-i     preseed/late_command string true && \
{{if "compute" in tagnames(node) }}
    echo ';' | sfdisk /dev/sdb && mkfs.ext4 /dev/sdb1 && \
    mkdir -p /target/srv && mount /dev/sdb1 /target/srv && \
    mkdir -p /target/srv/nova/instances && umount /target/srv && \
    echo '/dev/sdb1  /srv   ext4    defaults  0  2' >> /target/etc/fstab && \
{{endif}}
    in-target sh -c 'f=$1; shift; echo $0 > $f && chmod 0440 $f $*' 'ubuntu ALL=(ALL) NOPASSWD: ALL' /etc/sudoers.d/maas && \
    in-target wget --no-proxy "{{node_disable_pxe_url|escape.shell}}" --post-data "{{node_disable_pxe_data|escape.shell}}" -O /dev/null && \
    in-target wget --no-proxy -O /usr/local/bin/bondsetup.sh http://10.34.0.2/bondsetup-upstart.sh && \
    in-target chmod +x /usr/local/bin/bondsetup.sh && \
    in-target wget --no-proxy -O /etc/init/maas-bondsetup.conf http://10.34.0.2/maas-bondsetup.conf.trusty.{{node.fqdn}} && \
    true
{{enddef}}


bondsetup config:

description "Bonding setup"
start on starting udevtrigger

task

script
    if [ -x /usr/local/bin/bondsetup.sh ]; then
        rm -f /etc/network/interfaces.d/*.config || true
        echo -n >/etc/network/interfaces
        /usr/local/bin/bondsetup.sh -nbond0 -cem1 -odhcp -lem1,em2 -d162.213.32.1 -t1500 -bbr0
        chmod -x /usr/local/bin/bondsetup.sh
    fi
end script