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Configuring the Multi-Cluster Networking

Updated on 2025-01-02 GMT+08:00

Before creating an MCS object, ensure connectivity of both inter-cluster nodes and containers.

Check the connectivity by referring to Table 1. If the network between nodes or containers is not connected, connect them. If they still cannot be connected, rectify the fault by referring to FAQ.

Table 1 Connectivity of both inter-cluster nodes and containers

Inter-Cluster Network

How to Check

How to Connect

Node connectivity

Ping the IP address of a node in cluster B from cluster A. If the ping succeeds, the node connectivity is normal.

  1. Configure the network type.

    Set the network type to underlay for inter-cluster pod communication. For details, see Cluster Network Types.

  2. Connect the network between clusters.
    • Network connectivity between CCE clusters:

      CCE clusters in the same VPC can communicate with each other by default.

      Use a VPC peering connection to connect CCE clusters across VPCs.

    • Network connectivity between clusters of other types:

      Enable the network between clusters of other types as required.

Container connectivity

Use cURL to access a pod in cluster B from cluster A. If the access succeeds, the container connectivity is normal.

Cluster Network Types

Ensure that underlay networks are supported for inter-cluster pod communication. The following table lists the types of clusters that support underlay networks.
Table 2 Types of clusters that support underlay networks

Cluster Type

Cluster Subtype

Network Type

Support Underlay Network

Huawei Cloud clusters

CCE clusters

Container tunnel network

No

VPC network

Yes

CCE Turbo clusters

Cloud native network 2.0

Yes

On-premises clusters

On-premises clusters

Overlay and underlay networks

The overlay network is used by default. You need to manually enable the underlay network.

Yes

Multi-cloud clusters

Multi-cloud clusters

Overlay and underlay networks

The overlay network is used by default. You need to manually enable the underlay network.

Yes

Attached clusters

Attached clusters

Unknown

Network type–based

FAQ

If nodes or containers in different clusters cannot access each other, check the items listed in the following table.

Table 3

Check Item

Fault Locating

Solution

Whether the cluster version is v1.21 or later

Access the cluster details page.

Upgrade the cluster. For details, see Upgrading a Cluster.

Whether clusters can be accessed over an underlay network

Check this item by referring to Table 2.

Configure the network type by referring to Table 2.

Whether CIDR blocks overlap in the routes of the VPC peering connection

Go to the VPC peering connection details page.

Modify the overlapped CIDR blocks.

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