SDN Instance

What is SDN Instance?

SDN instance: A dedicated VM instance designed to provide SDN network capabilities.

Considerations

Before you create an SDN instance, you need to prepare the management network and SDN image required for an SDN instance.
An SDN instance is created from an SDN instance offering with a management network. The management network defined in the instance offering cannot be detached.

Create an SDN Instance

On the main menu of ZStack Cube Ultimate, choose Resource Center > Network Resource > SDN Device > SDN Instance. On the SDN Instance page, click Create SDN Instance. Then, the Create SDN Instance page is displayed.

On the displayed page, set the following parameters:

Name: Enter a name for the SDN instance.
Description: Optional. Enter a description for the SDN instance.
SDN Instance Offering: Select an SDN instance offering.
Cluster: Optional. Specify a cluster for the host on the which the SDN instance is to be started.
Host: Optional. Specify a host on which the SDN instance is to be started.
Storage Allocation Policy: The following two policies are supported:
- System Allocation: The system allocates a primary storage according to the preconfigured policy.
- Custom: Select a primary storage as needed.
Assign Management Network IP: Optional. Assign a management network IP to the SDN instance.

Manage an SDN Instance

On the main menu of ZStack Cube Ultimate, choose Resource Center > Network Resource > SDN Device > SDN Instance. Then, the SDN Instance page appears.

The following table lists the actions that you can perform on an SDN instance.

Action	Description
Create SDN Instance	Create an SDN instance.
Edit Name and Description	Edit the name and description of an SDN instance.
Launch Console	Access an SDN instance through terminals.
Start SDN Instance	Start a stopped SDN instance.
Stop SDN Instance	Stop a running SDN instance. Note: Stopping an SDN instance does not affect the existing VM network on the associated hosts. When stopped, you cannot create new VM instances using the associated OVS network.
Reboot SDN Instance	Reboot an SDN instance. Note: During the reboot process, you cannot create new VM instances using the associated OVS network or add new NICs to existing VM instances.
Change Host	Migrate an SDN instance to another host. This action only changes the host where the SDN instance runs and does not change the primary storage. We recommend that you perform this action during off-peak hours.
Change Host and Primary Storage	Migrate an SDN instance to another host and primary storage. After you change the primary storage, the host where the SDN instance resides is changed based on the system policy. Snapshots of running SDN instances will not be retained after storage migration.
Delete SDN Instance	Delete an SDN instance. Note: Deleting the SDN instance will cause the associated SDN controller to lose connection. Proceed with caution.

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