Creating an Instance

Introduction

An instance is an independent resource space. All operations are performed in an instance. Resources of different instances are isolated from each other. You can use one or more MAS instances based on service requirements.

Prerequisites

• A VPC is available, and a subnet and security group have been configured. (For details on how to create a VPC, subnet, and security group, see Preparing Resources.)
• You have had enough quota to create MAS instances. Otherwise, increase quota by referring to My Quotas.

Procedure

1. Go to the page for buying a MAS instance.
2. Configure the instance and click Create. The system will calculate the fee based on the selected product type.
   Figure 1 Buying a MAS instance
   

   Table 1 Instance parameters

   Parameter	Description
   Namespace	Select a namespace. NOTE: Namespaces with any of the following types are supported: Intra-city multi-active: Both the active and standby areas are in the current region. This is recommended for instances that are used for intra-city multi-active. Remote geographic-redundancy: The standby area is in the current region. This is recommended for instances that are used to execute workflows.
   Multi-Active Areas	The AZs of the areas had been set during namespace creation.
   Arbitration Node AZ	Select an AZ to which the ETCD arbitration node belongs based on your service deployment architecture. This is required when an intra-city multi-active namespace is selected.
   Billing Mode	There are two options: Pay-per-use: This postpaid mode bills you by instance usage. You can enable or delete your instance at any time. Yearly/Monthly: This prepaid mode bills you based on the subscription duration and is ideal when the resource use duration is predictable.
   Product Type	Platinum is supported.
   Two-way Authentication	ETCD authentication. This is enabled by default and is required when an intra-city multi-active namespace is selected. CAUTION: Disabling two-way authentication can be risky.
   Instance Name	Customize a name for the instance.
   Description	Enter a description for the instance.
   Enterprise Project	Select an enterprise project.
   Network	Select a VPC and subnet to be associated with the instance. The VPC and subnet must be created in advance.
   IPv4 CIDR Block	This CIDR block cannot overlap that of your VPC or any peering connection CIDR blocks. Recommended: 10.0.0.0/24, 172.16.0.0/24, 192.168.0.0/24
   Security Group	Select a security group to be associated with the instance. The security group must be created in advance. CAUTION: Enable the port of the monitored resource for the security group.
   ETCD Password	Enter an ETCD password. This is required when an intra-city multi-active namespace is selected.
   Confirm Password	Enter the ETCD password again. This is required when an intra-city multi-active namespace is selected.
   Required duration	This is required when Billing Mode is set to Yearly/Monthly.
   Auto Renew	This is required when Billing Mode is set to Yearly/Monthly. Renew the subscription on the management console. For details, see Renew Rules.

3. Wait for the system to create an instance with pay-per-use billing.

   Pay for the order and wait for the system to create an instance with yearly/monthly billing.

4. This will take 5 to 15 minutes to complete. After the instance is created, the instance status is Available on the Multi-Active Instances page.

   If the instance status is Failed, delete it, create another one, or contact the technical support.