Creating a VPC Peering Connection with Another VPC in Your Account¶
Scenarios¶
If two VPCs from the same region cannot communicate with each other, you can use a VPC peering connection. This section describes how to create a VPC peering connection between two VPCs in the same account.
This following describes how to create a VPC peering connection between VPC-A and VPC-B in account A to enable communications between ECS-A01 and RDS-B01.
Procedure:
Step 1: Create a VPC Peering Connection
Step 2: Add Routes for the VPC Peering Connection
Step 3: Verify Network Connectivity
Figure 1 Networking diagram of a VPC peering connection between VPCs in the same account¶
Notes and Constraints¶
Only one VPC peering connection can be created between two VPCs at the same time.
A VPC peering connection can only connect VPCs in the same region.
If the local and peer VPCs have overlapping CIDR blocks, the VPC peering connection may not take effect.
After a VPC peering connection is created, you must add routes to the route tables of the local and peer VPCs. Otherwise, the VPC peering connection does not take effect.
Prerequisites¶
You have two VPCs from the same account in the same region. If you want to create one, see Creating a VPC.
Step 1: Create a VPC Peering Connection¶
Log in to the management console.
Click
in the upper left corner and select the desired region and project.Click
in the upper left corner and choose Network > Virtual Private Cloud.The Virtual Private Cloud page is displayed.
In the navigation pane on the left, choose Virtual Private Cloud > VPC Peering Connections.
The VPC peering connection list is displayed.
In the upper right corner of the page, click Create VPC Peering Connection.
The Create VPC Peering Connection dialog box is displayed.
Configure the parameters as prompted.
For details, see Table 1.
Figure 2 Create VPC Peering Connection¶
Table 1 Parameters for creating a VPC peering connection¶ Parameter
Description
Example Value
VPC Peering Connection Name
Mandatory
Enter a name for the VPC peering connection.
The name can contain a maximum of 64 characters, including letters, digits, hyphens (-), and underscores (_).
peering-AB
Local VPC
Mandatory
VPC at one end of the VPC peering connection. You can select one from the drop-down list.
VPC-A
Local VPC CIDR Block
CIDR block of the selected local VPC
172.16.0.0/16
Account
Mandatory
Options: My account and Another account
Select My account.
My account
Peer Project
The system fills in the corresponding project by default because My account is set to Account.
For example, if VPC-A and VPC-B are in account A and region A, the system fills in the correspond project of account A in region A by default.
ab-cdef-1
Peer VPC
This parameter is mandatory if Account is set to My account.
VPC at the other end of the VPC peering connection. You can select one from the drop-down list.
VPC-B
Peer VPC CIDR Block
CIDR block of the selected peer VPC
If the local and peer VPCs have overlapping CIDR blocks, the VPC peering connection may not take effect. For details, see VPC Peering Connection Usage Examples.
172.17.0.0/16
Description
Optional
Enter the description of the VPC peering connection in the text box as required.
peering-AB connects VPC-A and VPC-B.
Click OK.
A dialog box for adding routes is displayed.
In the displayed dialog box, click Add Now. On the displayed page about the VPC peering connection details, go to Step 2: Add Routes for the VPC Peering Connection to add a route.
Step 2: Add Routes for the VPC Peering Connection¶
In the lower part of the VPC peering connection details page, click Add Route.
The Add Route dialog box is displayed.
Figure 3 Add Route¶
Add routes to the route tables as prompted.
Table 2 describes the parameters.
Table 2 Parameter description¶ Parameter
Description
Example Value
VPC
Select a VPC that is connected by the VPC peering connection.
VPC-A
Route Table
Select the route table of the VPC. The route will be added to this route table.
Each VPC comes with a default route table to control the outbound traffic from the subnets in the VPC. In addition to the default route table, you can also create a custom route table and associate it with the subnets in the VPC. Then, the custom route table controls outbound traffic of the subnets.
If there is only the default route table in the drop-down list, select the default route table.
If there are both default and custom route tables in drop-down list, select the route table associated with the subnet connected by the VPC peering connection.
rtb-VPC-A (Default route table)
Destination
An IP address or address range in the other VPC connected by the VPC peering connection. The value can be a VPC CIDR block, subnet CIDR block, or ECS IP address. For details about the route configuration example, see VPC Peering Connection Usage Examples.
VPC-B CIDR block: 172.17.0.0/16
Next Hop
The default value is the current VPC peering connection. You do not need to specify this parameter.
peering-AB
Description
Supplementary information about the route. This parameter is optional.
The description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).
Route from VPC-A to VPC-B
Add a route for the other VPC
If you select this option, you can also add a route for the other VPC connected by the VPC peering connection.
To enable communications between VPCs connected by a VPC peering connection, you need to add both forward and return routes to the route tables of the VPCs. For details, see VPC Peering Connection Usage Examples.
Selected
VPC
By default, the system selects the other VPC connected by the VPC peering connection. You do not need to specify this parameter.
VPC-B
Route Table
Select the route table of the VPC. The route will be added to this route table.
Each VPC comes with a default route table to control the outbound traffic from the subnets in the VPC. In addition to the default route table, you can also create a custom route table and associate it with the subnets in the VPC. Then, the custom route table controls outbound traffic of the subnets.
If there is only the default route table in the drop-down list, select the default route table.
If there are both default and custom route tables in drop-down list, select the route table associated with the subnet connected by the VPC peering connection.
rtb-VPC-B (Default route table)
Destination
An IP address or address range in the other VPC connected by the VPC peering connection. The value can be a VPC CIDR block, subnet CIDR block, or ECS IP address. For details about the route configuration example, see VPC Peering Connection Usage Examples.
VPC-A CIDR block: 172.16.0.0/16
Next Hop
The default value is the current VPC peering connection. You do not need to specify this parameter.
peering-AB
Description
Supplementary information about the route. This parameter is optional.
The description can contain a maximum of 255 characters and cannot contain angle brackets (< or >).
Route from VPC-B to VPC-A.
Click OK.
You can view the routes in the route list.
Step 3: Verify Network Connectivity¶
After you add routes for the VPC peering connection, verify the communication between the local and peer VPCs.
Log in to ECS-A01 in the local VPC.
Check whether ECS-A01 can communicate with RDS-B01.
ping IP address of RDS-B01
Example command:
ping 172.17.0.21
If information similar to the following is displayed, ECS-A01 and RDS-B01 can communicate with each other, and the VPC peering connection between VPC-A and VPC-B is successfully created.
[root@ecs-A02 ~]# ping 172.17.0.21 PING 172.17.0.21 (172.17.0.21) 56(84) bytes of data. 64 bytes from 172.17.0.21: icmp_seq=1 ttl=64 time=0.849 ms 64 bytes from 172.17.0.21: icmp_seq=2 ttl=64 time=0.455 ms 64 bytes from 172.17.0.21: icmp_seq=3 ttl=64 time=0.385 ms 64 bytes from 172.17.0.21: icmp_seq=4 ttl=64 time=0.372 ms ... --- 172.17.0.21 ping statistics ---
Important
In this example, ECS-A01 and RDS-B01 are in the same security group. If the instances in different security groups, you need to add inbound rules to allow access from the peer security group. For details, see Enabling ECSs In Different Security Groups to Communicate Through an Internal Network.
If VPCs connected by a VPC peering connection cannot communicate with each other, refer to Why Did Communication Fail Between VPCs That Were Connected by a VPC Peering Connection?.