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2.2. Configuring an IPv6 Address on the Undercloud

The Undercloud requires access to the Overcloud’s Public API, which is on the External network. To accomplish this, the Undercloud host requires an IPv6 address on the interface accessing the External network.

注記

The Provisioning network still requires IPv4 connectivity for every node. The Undercloud and the Overcloud nodes use this network for PXE boot, introspection, and deployment. In addition, the nodes use this network to access DNS and NTP services over IPv4.

Native VLAN or Dedicated Interface

If the Undercloud uses a native VLAN or a dedicated interface attached to the External network, use the ip command to add an IPv6 address to the interface. In this example, the dedicated interface is eth0: 

$ sudo ip link set dev eth0 up; sudo ip addr add 2001:db8::1/64 dev eth0

Trunked VLAN Interface

If the Undercloud uses a trunked VLAN on the same interface as the control plane bridge (br-ctlplane) to access the External network, create a new VLAN interface, attach it to the control plane, and add an IPv6 address to the VLAN. For example, our scenario uses 100 for the External network’s VLAN ID: 

$ sudo ovs-vsctl add-port br-ctlplane vlan100 tag=100 -- set interface vlan100 type=internal
$ sudo ip l set dev vlan100 up; sudo ip addr add 2001:db8::1/64 dev vlan100

Confirming the IPv6 Address

Confirm the addition of the IPv6 address with the ip command: 

$ ip addr

The IPv6 address appears on the chosen interface.

Setting a Persistent IPv6 Address

In addition to the above, you might want to make the IPv6 address permanent. In this case, modify or create the appropriate interface file in /etc/sysconfig/network-scripts/ (In our example, either ifcfg-eth0 or ifcfg-vlan100). Include the following lines: 

IPV6INIT=yes
IPV6ADDR=2001:db8::1/64

For more information, see How do I configure a network interface for IPv6? on the Red Hat Customer Portal.