Manage SDN Nodes

A node is an OpenVSwitch instance installed by OnAppp installation script on compute resources. You can assign and unassign nodes that have OpenVSwitch installed to be managed by SDN manager (Currently, only CentOS 7 KVM type of compute resources is supported). It will allow you to select the compute resource from compute resource zones. Adding nodes is the first step of the SDN network creation.

Prerequisite

Before you start configuring SDN Nodes, enable and start OpenVSwitch on each static compute resource that will host an SDN Node:

systemctl enable openvswitch.service
systemctl start openvswitch.service



View SDN Nodes


You can view both nodes assigned to your managers and the compute resources without nodes.

To view SDN nodes:

  1. Go to your Control Panel > AdminSettings menu.

  2. Click the SDN Management icon.

  3. Click the label of the SDN manager.

  4. Click the Nodes tab.

  5. Click the label of a compute zone to view the details:

    • Compute Zone - compute zone's name
    • Connection Option - how OpenVSwitch will be connected to SDN manager using the format: protocol:IP:port. Currently, only TCP protocol is available as a connection option
    • System ID - the ID of the compute resource
    • Connected - whether an SDN node is successfully connected to an SDN manager or not


Add SDN Nodes


To add SDN nodes:

  1. Go to your Control Panel > AdminSettings menu.

  2. Click the SDN Management icon.

  3. Click the label of the SDN manager.

  4. Click the Nodes tab.

  5. Click the label of a compute zone to which you want to add a node in 'Compute resources without node' section, select the connection option and then click the “+” button.

When using overlays, it is important to remember that an entire Ethernet frame is being encapsulated. This means that the Maximum Transmission Unit (MTU) for the underlay must be increased. By default, MTU for an Ethernet NIC is set to 1500. However, the MTU for each network interface, used for VXLAN tunnels, must be set to 1600 or higher to avoid issues with communication between VSs connected to different SDN nodes. Also, network infrastructure where the SDN is built should be configured for Jumbo Frames.

Reattach SDN Node


Sometimes adding SDN nodes to SDN manager may fail. In this case, you can detach SDN node from SDN manager and then attach it again. This action is available only if the node and the network are not connected to each other.

To reattach SDN node:

  1. Go to your Control Panel > AdminSettings menu.

  2. Click the SDN Management icon.

  3. Click the label of the SDN manager.

  4. Click the Nodes tab.

  5. Click the label of a compute zone from which you want to reattach a node.
  6. Click the Actions button next to the node you want to reattach, then click Reattach.

Delete SDN Nodes


To delete your SDN nodes:

  1. Go to your Control Panel > AdminSettings menu.

  2. Click the SDN Management icon.

  3. Click the label of the SDN manager.

  4. Click the Nodes tab.

  5. Click the label of a compute zone from which you want to delete a node and then click the Delete button.


Note that you cannot delete SDN node if it has any compute resources.