A VPC is an isolated private network. By default, VPCs cannot communicate with each other over the intranet. ECS instances in a VPC cannot access the Internet or be accessed from Internet, and a VPC cannot access a classic network through the intranet. But most of Alibaba Cloud products provide capabilities of both Internet access and intranet access, more than 95% of the cloud products support VPCs.
Note: The network type must be the same for the cloud product instances requiring intranet communication. For example, if a VPC ECS instance needs to access a Server Load Balancer instance and an RDS instance through the intranet, the network type of the Server Load Balancer and RDS must also be VPC and belong to a same VPC. Otherwise, they cannot communicate with each other.
The ways to use VPC are different for different cloud products.
Select VPC on the purchase page
This approach mainly applies to instance-type cloud products, such as ECS, RDS, and Server Load Balancer. The purchase pages of such cloud products offer an option to select the network type.
The following figure shows the network type option on the ECS purchase page.
The following figure shows the network type option on the RDS purchase page.
The following figure shows the network type option on the Server Load Balancer purchase page.
Select the VPC access on the console
This approach applies to the cloud products such as Table Store, Container Service, E-MapReduce and NAS.
You can set a VPC access domain for Table Store instances on the Table Store console. For Container Service and E-MapReduce, you can select a VPC when creating a cluster on the console. The Network Attached Storage product provides the VPC mount point.
Check the VPC access endpoint through documentation
For cloud products, such as Log Service and OSS, refer to the following documents:
Some instance-type cloud products support the switching of network types. For example, you can switch the network type of an RDS instance on the console.
ECS products will also be able to switch from the classic network to VPC.
Server Load Balancer does not support switching from the classic network to VPC. As an alternative, you can purchase a VPC instance.
Note that some cloud products, such as CDN and Situation Awareness, do not need VPC.