Prerequisites

You have deployed VCNs in stack mode.

• Before creating a cluster, ensure that servers to be added to the cluster have time-synchronized with each other. Otherwise, the cluster cannot be created. For details about how to configure NTP time synchronization, see Setting the Server IP Address, NTP Time Synchronization, and System Time.
• If NAT needs to be configured, please complete the NAT configuration before setting up a cluster. Otherwise, you need to dismiss the cluster and stack, set up a stack again, configure NAT, and then set up a cluster.

Background

 NOTE:

In a cluster configured based on the stacking network, if a server is faulty, the system schedules the cameras connected to the faulty server to normal servers according to the load balancing policy. To alleviate the recording storage pressure of other normal servers, recover the faulty server as quickly as possible.

Table 1 lists the networking requirements for two types of stacking networks.

Table 1 Cluster networking requirements

Master Domain Server	Maximum Number of Slave Domain Servers	Whether the Master Domain Server Is a Cluster Member	Maximum Number of Servers in a Cluster	Description
MPU	15	Yes	16	A cluster contains 3 to 16 servers. A stacking network can be regarded as a domain. A domain can have multiple clusters.
VMU	128	No	16

Procedure

1. Log in to the OMU portal of the master domain server (master MPU or VMU) as the Admin user.
2. Choose Cluster Management > Cluster Management.
3. Select a cluster node from the navigation tree on the left and click Add.
4. Enter the cluster type, cluster name and cluster description and click Next, as shown in Figure 1.
   Figure 1 Adding a cluster
   
   
   Table 2 describes the cluster parameters.

   Table 2 Cluster parameters

   Parameter	Description
   Cluster Type	The options are as follows: Common cluster: consists of 3-16 common MPUs. Forwarding cluster: consists of 3-16 forwarding MPUs. NOTE: A common MPU can connect to a maximum of 256(VCN3010) or 512 (VCN3020) cameras. A forwarding MPU can connect to a maximum of 5000 cameras. It allows users to view live video from cameras but cannot store video. No data disks need to be configured.
   Cluster Name	Enter the cluster name as planned.
   Cluster Description	N/A

5. Select 3-16 servers as the cluster members and click Next, as shown in Figure 2.
   Figure 2 Selecting cluster members
   
   
    NOTE:

   When the product model is VCN3020, Product Type in Figure 1 is displayed as VCN3020.

6. Select the cluster server in cluster members.
   • If the cluster members include the master server, select the cluster server member, enter the floating IP address of the master node, and click Next, as shown in Figure 3.

     The floating IP address of the master node is an IP address newly allocated to the master domain server of a cluster. You can use the floating IP address to log in to the master domain server. If the master domain server is faulty and is replaced by a new one, you can also use the original floating IP address to log in to the new master domain server.

     Figure 3 Selecting cluster servers (1)
     
     
   • If the cluster members do not include the master server, select the cluster server member and click Next, as shown in Figure 4.
     Figure 4 Selecting cluster servers (2)
     
     

   The cluster server is used for processing cluster information. When multiple cluster servers are deployed, system reliability can be greatly enhanced. Select the cluster servers based on the following rules:

   • You can only select an odd number of cluster servers. When the cluster members include the master server, the master server must function as the cluster server.
   • For a cluster having 3-4 members, you are advised to select three cluster members as the cluster servers.
   • For a cluster having 5-6 members, you are advised to select five cluster members as the cluster servers.
   • For a cluster having 7-16 members, you are advised to select seven cluster members as the cluster servers.

7. Select one cluster server as the master central database server, Click Next, as shown in Figure 5.
   Figure 5 Selecting a master central database server
   
   

8. Select two cluster servers as the slave central database server. Click Next, as shown in Figure 6.

   One master central database servers and two slave central database server are used to store camera information, user information, and basic domain information.

   Figure 6 Selecting slave central database servers
   
   

9. Configure a cluster floating gateway as required.
   • When a device accesses the cluster using HWSDK and GB/T 28181 in active registration mode, you need to configure a cluster floating gateway.
     1. Select a cluster member as the cluster floating gateway, and set the IP address for the gateway. Click Next, as shown in Figure 7.
        Figure 7 Selecting a cluster floating gateway
        
        

         NOTE:

        The floating gateway IP address of the cluster and cluster member IP address are in the same network segment.

        The floating gateway is used to schedule cameras that access the cluster in active registration mode. Select the cluster floating gateway based on the following rules:

        • You can select any cluster member as the cluster floating gateway. A cluster member excluding the master domain server and central database servers is recommended.
        • You can select a maximum of n/2 cluster members as the floating gateway, and n indicates the number of cluster members. One cluster member is recommended.
           NOTE:

          For example, if a cluster contains nine cluster members, you can use at most four of them as the cluster floating gateways. However, it is recommended that you select only one.
     2. Click Gateway of one or more cluster members, and choose a gateway IP address, as shown in Figure 8.
        Figure 8 Setting the gateway of cluster members
        
        
     3. Click Save.

        A message is displayed, indicating that the system is creating the cluster. Wait until a message indicating that the cluster is successfully created is displayed.

   • If you do not need to set a cluster floating gateway, click Next.

     In the displayed dialog box, click OK. A message is displayed, indicating that the system is creating the cluster. Wait until a message indicating that the cluster is successfully created is displayed.

Verification

Click the node in Cluster List on the left. The node is expanded, and the newly added cluster is displayed, as shown in Figure 9.

Figure 9 Verification

Adding or Deleting Cluster Members

Before adding or deleting cluster members, note the following:

• You can delete a faulty cluster member, but the master domain server and cluster servers cannot be deleted.
• After a cluster member is deleted, cameras connected to the cluster member are automatically scheduled to other cluster members, and the attributes of the cameras remain unchanged. However, existing video files of the cameras are stored on the local disk of the original cluster member.
• Before adding a VCN as a new cluster member, ensure that the VCN has been stacked with the master domain server.
  

  Before adding servers to a cluster, ensure that these servers have time-synchronized with each other. Otherwise, the servers cannot be added to the cluster.

  After a cluster is created, you can perform the following operations to add members to the cluster:

  1. In Cluster List, click a cluster to which members are to be added.
  2. Click Add Member. The page shown in Figure 10 is displayed.
     Figure 10 Adding a member
     
  3. Click Next.
  4. (Optional) Configure a floating gateway IP address for cluster members, as shown in Figure 11.
     Figure 11 Configuring the floating gateway
     

      NOTE:

     Floating gateway is the floating gateway IP address of the cluster.
  5. Click Save.

 NOTE:

If the new cluster member works as a slave domain server, enter the floating IP address of the master domain server as the IP address of the master domain server when you set the stack parameters for the new cluster member.

Dismissing a Cluster