Elastic Compute Service:Manage prefix lists

ECS console

1. Go to ECS Console - Prefix List.

2. In the upper-left corner of the page, select a region and resource group.

3. On the Prefix Lists tab, click Create Prefix List.

4. In the Create Prefix List dialog box, configure the parameters for the prefix list.

   Parameter	Description
   Prefix list name	Enter a name for the prefix list.
   Description	Enter a description for the prefix list. We recommend that you describe its intended purpose.
   Address family	Select the IPv4 or IPv6 address family. You cannot change the address family after the prefix list is created. If you select IPv4, you can add only IPv4 CIDR blocks. If you select IPv6 Supported, you can add only IPv6 CIDR blocks.
   Max entries	Specify the maximum number of entries that the prefix list can contain. You cannot change this value after the prefix list is created. For example, the CIDR blocks 10.0.0.0/8 and 172.16.0.0/12 count as two entries. Valid values: 1 to 200 Note Associated resources, such as security groups, use the value of max entries to calculate their rule quotas, regardless of the actual number of entries.
   Prefix list entries	Specify the CIDR blocks. You can click Add Entry to add a CIDR block and a description. The following limits apply to entries in a prefix list: The total number of entries cannot exceed the value of Max Entries. You can enter multiple CIDR blocks, separated by a space or a comma (,). The Address Family setting determines the type of CIDR blocks that you can add. A prefix list cannot contain both IPv4 and IPv6 CIDR blocks. Each CIDR block entry must be unique. For example, you cannot add 192.168.1.0/24 twice. You can specify an IP address. The system automatically converts it into a CIDR block. For example, if you specify 192.168.1.100, the system automatically converts it to 192.168.1.100/32. If you specify an IPv6 CIDR block, the system automatically converts it to its compressed format. For example, if you specify 2001:0DB8:0000:0000:0000:0000:0000:0000/32, the system automatically converts it to 2001:db8::/32.

5. Click OK.

   After the prefix list is created, you can view its information on the list page. You can also reference the prefix list in security group rules. For more information, see Add a security group rule.

API

• Call the CreatePrefixList operation to create a prefix list. After the prefix list is created, you can call the DescribePrefixListAttributes operation to query the details of the prefix list.

• You can call the AuthorizeSecurityGroup operation and set the SourcePrefixListId parameter in an inbound rule of a security group to reference the prefix list that you created.

• You can also call the AuthorizeSecurityGroupEgress operation and set the DestPrefixListId parameter in an outbound rule of a security group to reference the prefix list that you created.

ECS console

1. Go to ECS Console - Prefix List.

2. In the upper-left corner of the page, select a region and resource group.

3. On the Prefix Lists tab, find the prefix list that you want to manage and click its ID.

4. On the Entries tab, manage the entries in the prefix list.

   • Add an entry

     1. Click Add Entry.

     2. Enter a CIDR block and a description, and then click Save.

     To add more entries, repeat these steps.

   • Modify an entry

     1. On the prefix list details page, find the entry to modify and click Modify in the Actions column.

     2. Modify the CIDR block and description of the entry, and then click Save.

   • Delete entries

     • To delete a single entry, find the entry and click Delete in the Actions column.

     • To delete multiple entries, select them and click Delete at the bottom of the list.

API

Call the ModifyPrefixList operation to manage the entries in a prefix list and modify its name and description.

ECS console

1. Go to ECS Console - Prefix List.

2. In the upper-left corner of the page, select a region and resource group.

3. On the Prefix Lists tab, find the prefix list that you want to manage and click its ID.

4. Click the Associated Resources tab to view the IDs and types of the resources that are associated with the prefix list.

API

Call the DescribePrefixListAssociations operation to query the resources that are associated with a prefix list.

ECS console

1. Go to ECS Console - Prefix List.

2. In the upper-left corner of the page, select a region and resource group.

3. On the Prefix Lists tab, find and delete the required prefix list or lists.

   • Delete a single prefix list

     Find the prefix list that you want to delete and click Delete in the Actions column. In the dialog box that appears, confirm the information and click OK.

   • Delete multiple prefix lists

     Select the prefix lists that you want to delete and click Batch Delete at the bottom of the page. In the dialog box that appears, confirm the information, click Next, and then click OK.

API

Call the DeletePrefixList operation to delete a prefix list and all of its entries.