gistfile1.txt

This config is used on a server with 6 physical network cards. four of them will be used to create two 2-nic bonds (bond0, bond1) and the remaining two will remain unused for now (enp5s0f0,enp5s0f1). First we enable the bonding module by writing out two files (review the bonding module options for your own environment). We then write out unit files to :

- 00-bond*.netdev  : Setup two bonding interfaces (units) 
- 01-*.network  : Attach each interface to the right bond interface
- 99-dhcp.network : Disable DHCP on the remaining interfaces (' catch all ') 
- down-interfaces.service : One time service to flush out all the assigned IP adresses and down the interfaces
- systemd-networkd.service : Restart the networkd service to 'up'  the bonding interfaces

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#cloud-config

hostname: node-00
write_files:
  - path: /etc/modprobe.d/bonding.conf
    permissions: 0644
    owner: root
    content: |
      options bonding miimon=100 mode=4 lacp_rate=1
  - path: /etc/modules-load.d/bonding.conf
    permissions: 0644
    owner: root
    content: |
      bonding
coreos:
  units:
    - name: systemd-networkd.service
      command: stop
    - name: 00-bond0.netdev
      runtime: true
      content: | 
        [NetDev]
        Name=bond0
        Kind=bond
    - name: 00-bond1.netdev
      runtime: true
      content: | 
        [NetDev]
        Name=bond1
        Kind=bond
    - name: 01-enp2s0f0.network
      content: |
        [Match]
        Name=enp2s0f0

        [Network]
        Bond=bond0
    - name: 01-enp4s0f0.network
      content: |
        [Match]
        Name=enp4s0f0

        [Network]
        Bond=bond0
    - name: 01-enp2s0f1.network
      content: |
        [Match]
        Name=enp2s0f1

        [Network]
        Bond=bond1
    - name: 01-enp4s0f1.network
      content: |
        [Match]
        Name=enp4s0f1

        [Network]
        Bond=bond1
    - name: 10-bond0.network
      runtime: true
      content: |
        [Match]
        Name=bond0

        [Network]
        DNS=8.8.8.8
        Address=172.16.250.219/24
        Gateway=172.16.250.254
    - name: 10-bond1.network
      runtime: true
      content: |
        [Match]
        Name=bond1

        [Network]
        Address=10.172.40.219/24
    - name: 99-dhcp.network
      runtime: true
      content:  |
        [Match]
        Name=en*

        [Network]
        DHCP=no
    - name: down-interfaces.service
      command: start
      content: |
        [Service]
        Type=oneshot
        ExecStart=/usr/bin/ip link set enp2s0f0 down
        ExecStart=/usr/bin/ip addr flush dev enp2s0f0
        ExecStart=/usr/bin/ip link set enp2s0f1 down
        ExecStart=/usr/bin/ip addr flush dev enp2s0f1
        ExecStart=/usr/bin/ip link set enp4s0f0 down
        ExecStart=/usr/bin/ip addr flush dev enp4s0f0
        ExecStart=/usr/bin/ip link set enp4s0f1 down
        ExecStart=/usr/bin/ip addr flush dev enp4s0f1
        ExecStart=/usr/bin/ip link set enp5s0f0 down
        ExecStart=/usr/bin/ip addr flush dev enp5s0f0
        ExecStart=/usr/bin/ip link set enp5s0f1 down
        ExecStart=/usr/bin/ip addr flush dev enp5s0f1
    - name: systemd-networkd.service
      command: restart
  update:
    group: stable
    reboot-strategy: 'off'
users:
  - name: core
    groups:
      - sudo
    shell: /bin/bash
    ssh-authorized-keys:
      - ssh-rsa ....