Using a Cloud Connection to Enable Cross-Region Network Communications

Notes and Constraints

• The migration resource group uses a private network segment that cannot overlap with the network segment of the data source. Otherwise, the network cannot be connected.
• The migration resource group does not have a public network segment and can only connect to the private network of the data source.

Prerequisites

• You have purchased a migration resource group. For details, see Buying a DataArts Migration Resource Group Incremental Package.
• You have purchased and configured a cloud connection to enable communications between the data source VPC and a VPC of the current tenant. For how to enable and configure a cloud connection, see .

Preparations

Obtain the network segments of the related objects (including the data source, transit VPC, and migration resource group).

Table 1 Network segment planning for resources

Resource	Description	Example Private Network Segment
Data source network segment	VPC to which the Huawei Cloud data source belongs. The method of viewing the VPC varies depending on the data source. For details, see the official documentation of the corresponding data source.	192.168.0.0/24
Transit VPC	Used for the communications between the data source and migration resource group. In this solution, a VPC in the same region and of the same tenant configured in the cloud connection is used. To obtain the VPC, perform the following operations: Log in to the Cloud Connect console. In the navigation pane on the left, choose Cloud Connect > Cloud Connections. In the cloud connection list, click the name of the target cloud connection. On the displayed page, click the Network Instances tab and locate the VPC that is in the same region and of the same tenant as the migration resource group. This VPC can be used as the transit VPC. Figure 2 Viewing a cloud connection Figure 3 Determining the transit VPC	VPC: 10.186.0.0/19
Migration resource group VPC	VPC to which the real-time computing resource group belongs. The migration resource group is created under the resource tenant of the user account and uses the VPC network segment of the resource tenant. To obtain the VPC, perform the following operations: Log in to the DataArts Studio console, access an instance, and click the Resources tab. On the Real-Time Resources page, expand the target migration resource group to view its VPC network segment. Figure 4 Obtaining the migration resource group network segment	172.16.0.0/19

Network Configuration Process

1. Configure rules for the security group to which the Huawei Cloud database belongs.

   Add an inbound rule for the security group of the Huawei Cloud database to allow the VPC network segment (for example, 172.16.0.0/19) of the resource group to access the database listening port.

   To add a security group rule, perform the following steps: Go to the data source service page, access the user cluster, locate the network information, and click the security group. On the displayed security group editing page, add an inbound rule. The following is an example of how to allow access from the migration resource group.

   Priority  Policy    Type         Protocol Port                    Source Address
   1       Allow    IPv4       All protocols                 IP address: migration resource group network segment

   

   The ports used by different data sources vary. Configure the ports for security group rules by referring to .

2. Add a route to the network of the database on Huawei Cloud.

   Add a route to the route table of the VPC subnet to which the Huawei Cloud database belongs. Set the destination to the VPC network segment of the migration resource group (for example, 172.16.0.0/19), and set the next hop to the cloud connection you have configured.

   1. Log in to the VPC console as the data source tenant. In the navigation pane on the left, choose Virtual Private Cloud > Subnets. Locate the subnet of data source and click the route table name to go to the configuration page.
      Figure 5 Obtaining the data source route table
      
   2. On the displayed page, click the Summary tab and then Add Route. In the displayed dialog box, set Destination to the VPC network segment of the migration resource group (for example, 172.16.0.0/19) and Next Hop to the cloud connection you have configured.
      Figure 6 Adding a route to the route table of the data source
      

3. Modify the VPC CIDR block of the transit VPC.

   Log in to the Cloud Connect console. In the navigation pane on the left, choose Cloud Connect > Cloud Connections. In the cloud connection list, click the name of the target cloud connection. On the displayed page, click the Network Instances tab, locate the transit VPC, and click Modify VPC CIDR Block. In the displayed dialog box, enter the VPC CIDR block of the migration resource group (for example, 172.16.0.0/19) for Other CIDR Block.

   Figure 7 Viewing a cloud connection
   
   Figure 8 Cloud Connect network instance
   
   Figure 9 Changing the VPC CIDR block of the Cloud Connect network instance
   

4. Create a real-time network connection.

   To connect the transit VPC to the real-time migration resource group VPC, you can create a VPC peering connection between the two VPCs using the resource management function provided of DataArts Studio.

   Log in to the DataArts Studio console, access an instance, and click the Resources tab.

   Figure 10 Creating a network connection
   

   On the Real-Time Network Connections tab page, click Create. In the displayed Create Network Connection dialog box, set required parameters.

   Table 2 Parameters for creating a network connection

   Parameter	Description
   Connection Name	Name of the network connection Only letters, digits, and underscores (_) are allowed.
   Resource Group	Migration resource group that can communicate with the specified VPC. If you do not select a migration resource group, you can bind migration resource groups to the connection after the connection is created by clicking More in the Operation column and selecting Bind Resource Group.
   VPC	VPC that can communicate with the migration resource group In this solution, the migration resource group network segment and the transit VPC are connected through a VPC peering connection. Therefore, you must select a transit VPC (for example, 10.186.0.0/19).
   Subnet	Subnet of the transit VPC, for example, 10.186.0.0/24
   Routing Table	Routing table associated with the subnet. When the connection is bound to a migration resource group, routing information of the migration resource group is added to the routing table. You do not need to set this parameter. When the connection is bound to a migration resource group, a route to the migration resource group VPC network segment is added to the routing table. The route connects the migration resource group network segment to the transit VPC.

5. Add a route to the data source network segment for the real-time network connection (VPC peering connection).

   Locate the real-time network connection created in step 4, click More in the Operation column, and select Add Route. In the displayed dialog box, enter the network segment of the VPC subnet of the Huawei Cloud database, for example, 192.168.0.0/24.

   Figure 11 Adding route 1
   
   Figure 12 Adding route 2
   

6. (Optional) For MRS data sources, perform the following extra operations to enable network communications:

   After creating a real-time network connection and binding it to a migration resource group, click More in the Operation column and select Modify Host Information. In the displayed dialog box, enter the IP addresses and domain names of all nodes in the MRS cluster as prompted.

   Figure 13 Modifying host information
   
   

   To obtain the IP addresses and domain names of the nodes in an MRS cluster, perform the following steps:

   • Open the MRS page, access the MRS cluster, click the Nodes tab, and expand all node groups to view the IP address and name (domain name) of each node.

     Add the IP addresses (1 in the figure) and domain names (2 in the figure) of all nodes and separate them by pressing Enter.

     Figure 14 Obtaining the IP addresses and domain names of the nodes in the MRS cluster
     
   • Log in to an MRS cluster node by referring to and run the cat /etc/hosts command to list the IP addresses and domain names of all nodes.

7. Test the network connectivity.

   In a DataArts Studio workspace, create a data connection and a real-time migration job, and select the corresponding data connection and migration resource group to test the connectivity. For details, see Creating a Real-Time Migration Job.