Note
Tencent Cloud has stopped supporting the creation of any new resources in the classic network on March 31, 2022, and has officially discontinued the service of classic network since December 31, 2022. The corresponding services are provided by Virtual Private Cloud (VPC) products.
Are my resources running in the classic network still available after March 31, 2022?
Your existing resources running in the classic network are still available till December 31, 2022. We recommend you migrate your resources to a VPC as soon as possible. For more information, see Migration Solutions.
Will my services be interrupted during the migration from the classic network to VPC?
This depends on the specific Tencent Cloud service that you use:
For TencentDB services, your services are not affected as dual-IP accessing is supported during migration.
To migration a CVM instance, the instance must be shut down, which will interrupt your service for a short while. We recommend you migrate during off-peak hours.
CLB doesn't support direct migration. You can rebuild instances with the same configuration and gradually migrate the applications.
Will the billing mode change after the migration from the classic network to VPC?
The billing mode is not changed.
Will the original private IP of the instance change after the migration from the classic network to VPC?
If the IP of the instance is within the target VPC IP range, you can keep the private IP unchanged by specifying it as the new IP. Otherwise, the private IP will change.
Will the original public IP of the instance change after the migration from the classic network to VPC?
The original public IP will remain the same.
Can I migrate a CVM from a VPC to the classic network?
No.
What are the differences between the classic network and VPC?
Both classic network and VPC are cyberspaces in the cloud. Their differences are as follows:
The classic network is a public network resource pool shared by all Tencent Cloud users. The private IPs of all CVM instances are assigned by Tencent Cloud. You cannot customize IP ranges or IP addresses.
A VPC is a logically isolated network space in Tencent Cloud. In a VPC, you can customize IP ranges, IP addresses, and routing policies, making it more suitable for use cases requiring custom configurations.
What are the strengths of a VPC?
It allows you to customize IP ranges, IP addresses, and routing policies.
It supports more complex scenarios such as ENI, network ACL, and cross-region communication.
It improves the disaster recovery capability and availability greatly.
Can I migrate a CVM from the classic network to a VPC?
Note
This operation cannot be undone. Be sure to carefully read the document before performing this operation.
Which Tencent Cloud products support the classic network?
Classic network servers: CVM, GPU Cloud Computing, and FPGA Cloud Computing.
Classic network database: TencentDB for MySQL, Redis, SQL Server, PostgreSQL, and MongoDB, as well as TDSQL for MySQL.
Classic network load balancer: Classic CLB and CLB.
Others: Classic network CFS and classic network CKafka.
How can I establish communication between a classic network-based CVM and a VPC-based CVM?
You can use Classiclink to establish communication between the classic network and VPCs.
Note the following limitations when using Classiclink:
1. Both the classic network and the VPC are located in the same region (they can be in different AZs, such as Guangzhou Zone 1 and Guangzhou Zone 2).
2. The VPC CIDR block (IP range) must fall within
10.[0-47].0.0/16 (including subsets). Otherwise, there will be conflicts.If these conditions are met, you can configure Classiclink on the VPC details page in the console, to associate the classic network-based CVMs with the VPC for interconnection.
Can resources such as cloud load balancers and databases in the classic network communicate with the VPC?
A terminal connection helps instances in a VPC to communicate with instances in the classic network instances through a private network. It maps classic network instance IPs to VPC IP addresses, allowing you to access the classic network instances through the VPC IPs. Classic network products that support terminal connections include CLB, TencentDB, CMEM, Redis, and MongoDB. However, cross-region or cross-account communication is not supported.
Direction: One-way (the VPC accesses the classic network).
If needed, submit a ticket.
Can the classic network and VPC instances under different accounts communicate with each other?
No. A VPC supports more features with greater flexibility, and therefore we recommend that you migrate resources from the classic network to a VPC.
How can I disassociate a VPC from a CVM in the classic network?
The procedure for disassociation is as follows:
1. Log in to the VPC console.
2. Click the ID/Name of the VPC which needs Classiclink to access the details page.
3. Click Classiclink. Select the classic network-based CVM to be disassociated and click Disassociate.
4. Click OK.