rancherOS/docs/os/networking/interfaces/index.md

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title: Configuring Network Interfaces in RancherOS layout: os-default redirect_from:

• os/configuration/networking/ ---

Interfaces

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Using ros config, you can configure specific interfaces. Wildcard globbing is supported so eth* will match eth1 and eth2. The available options you can configure are address, gateway, mtu, and dhcp.

$ sudo ros config set rancher.network.interfaces.eth1.address 172.68.1.100/24
$ sudo ros config set rancher.network.interfaces.eth1.gateway 172.68.1.1
$ sudo ros config set rancher.network.interfaces.eth1.mtu 1500
$ sudo ros config set rancher.network.interfaces.eth1.dhcp false

If you wanted to configure the interfaces through the cloud config file, you'll need to place interface configurations within the rancher key.

#cloud-config
rancher:
  network:
    interfaces:
      eth1:
        address: 172.68.1.100/24
        gateway: 172.68.1.1
        mtu: 1500
        dhcp: false

Multiple NICs

If you want to configure one of multiple network interfaces, you can specify the MAC address of the interface you want to configure.

Using ros config, you can specify the MAC address of the NIC you want to configure as follows:

$ sudo ros config set rancher.network.interfaces.”mac=ea:34:71:66:90:12:01”.dhcp true

Alternatively, you can place the MAC address selection in your cloud config file as follows:

#cloud-config
rancher:
  network:
    interfaces:
      "mac=ea:34:71:66:90:12:01":
         dhcp: true

NIC bonding

You can aggregate several network links into one virtual link for redundancy and increased throughput. For example:

#cloud-config
rancher:
  network:
    interfaces:
      bond0:
        addresses:
        - 192.168.101.33/31
        - 10.88.23.129/31
        gateway: 192.168.101.32
        bond_opts:
          downdelay: "200"
          lacp_rate: "1"
          miimon: "100"
          mode: "4"
          updelay: "200"
          xmit_hash_policy: layer3+4
        post_up:
        - ip route add 10.0.0.0/8 via 10.88.23.128
      mac=0c:c4:d7:b2:14:d2:
        bond: bond0
      mac=0c:c4:d7:b2:14:d3:
        bond: bond0

In this example two physical NICs (with MACs 0c:c4:d7:b2:14:d2 and 0c:c4:d7:b2:14:d3) are aggregated into a virtual one bond0.

VLANS

In this example, you can create an interface eth0.100 which is tied to VLAN 100 and an interface foobar that will be tied to VLAN 200.

#cloud-config
rancher:
  network:
    interfaces:
      eth0:
        vlans: 100,200:foobar

Bridging

In this example, you can create a bridge interface.

#cloud-config
rancher:
  network:
    interfaces:
      br0:
        bridge: true
        dhcp: true
      eth0:
        bridge: br0