Bridged network

This example shows how to configure a simple bridge interface using netplan.

Step 1 - (Pre)configure the bridge on the host

In order to use the bridged network, bridge interface needs to be preconfigured on the host machine.

Create the bridge interface (br0 in our case) by creating a file with the following content:

network:
  version: 2
  renderer: networkd
  ethernets:
    eth0: {} # (1)!
  bridges:
    br0: # (2)!
      interfaces:
        - eth0
      dhcp4: true
      dhcp6: false
      addresses: # (3)!
        - 10.10.0.17

1. Existing ethernet interface to be enslaved.

2. Custom name of the bridge interface.

3. Optionally a static IP address can be set for the bridge interface.

Validate if the configuration is correctly parsed by netplan.

sudo netplan generate

Apply the configuration.

sudo netplan apply

Step 2 - Disable netfilter on the host

The final step is to prevent packets traversing the bridge from being sent to iptables for processing.

 cat >> /etc/sysctl.conf <<EOF
 net.bridge.bridge-nf-call-ip6tables = 0
 net.bridge.bridge-nf-call-iptables = 0
 net.bridge.bridge-nf-call-arptables = 0
 EOF

 sysctl -p /etc/sysctl.conf

Step 3 - Set up a cluster over bridged network

In the cluster configuration file, set the following variables:

• cluster.network.mode to bridge,
• cluster.network.bridge to the name of the bridge you have created (br0 in our case) and
• cluster.network.gateway if the first host in network_cidr is not a gateway.

cluster:
  network:
    mode: "bridge"
    cidr: "10.10.13.0/24"
    gateway: "10.10.13.1"
    bridge: "br0"
...