Create a replica set instance

Billing

For more information, see Billing items and pricing.

Procedure

1. Log on to the ApsaraDB for MongoDB console.
2. In the left-side navigation pane, click Replica Set Instances.
3. On the Replica Set Instances page, click Create Instance.
4. Click Subscription(Replica Set) or Pay-As-You-Go(Replica Set).
   Note

   • Subscription: You must pay for the subscription when you create an instance. We recommend that you select this billing method for long-term use, because it is more cost-effective than pay-as-you-go billing. Longer subscription periods have larger discounts.
   • Pay-as-you-go: A pay-as-you-go instance is charged at an hourly rate based on your actual resource usage. We recommend that you select this billing method for short-term use. You can reduce costs by releasing your pay-as-you-go instance after you no longer need it.
5. Configure the instance. The following table describes related parameters.

   Section	Parameter	Description
   Basic Configuration	Region	The region where the replica set instance is deployed. Only instances in the same region can communicate with each other inside an internal network. After an instance is created, you cannot change its region. Exercise caution when you select the region. Instances in the same region (such as an ECS instance and an ApsaraDB for MongoDB instance) can be interconnected with each other through an internal network.
   	Zone	A zone is a geographic area with an independent power supply and network. An ECS instance and an ApsaraDB for MongoDB instance in the same zone can be interconnected over an internal network with the minimum network latency. Note To implement zone-disaster recovery, you can deploy the replica set instance across multiple zones. For more information, see Create a multi-zone replica set instance.
   	Database Version	The version of the database engine for the replica set instance. ApsaraDB for MongoDB supports 3.4, 4.0, and 4.2. For more information about versions, see version and storage engine. Note ApsaraDB for MongoDB 3.2 has been taken offline. For more information, see [Notice] ApsaraDB for MongoDB went offline in version 3.2 and went online in version 4.2 on February 4.. You can manually upgrade the database version while the instance is running. For more information, see Upgrade the database version.
   	Storage Engine	The storage engine is WiredTiger.
   	Replication Factor	Select the number of nodes for the replica set instance based on your business needs. For example, you can select more nodes for business scenarios with more reads than writes.
   	Network Type	Classic	Cloud services in a classic network are not isolated. You can configure security groups or whitelist policies to block unauthorized access to the cloud services.
   VPC		A VPC is an isolated network with higher security and performance than a classic network. Note You must create a VPC in advance. For more information, see Create a VPC. You can change the network type after you create an instance. For more information, see Modify the instance network type. If you want to migrate your applications to the cloud, you can build a virtual data center by connecting your on-premises data center to the resources in a VPC through a leased line or a virtual private network (VPN). For more information, see Configure a hybrid access solution to switch the network type of an ApsaraDB for MongoDB instance from Classic Network to VPC.
   Specifications	Specification	The CPU and memory occupied by the instance. The maximum number of connections and maximum IOPS vary depending on different specifications. The maximum IOPS is measured for read and write operations separately, and the maximum sum of read and write operations can be twice the maximum IOPS. For more information, see Instance types.
   	Storage Space	The storage space is exclusive to each node in the replica set instance. Note The storage space of a node stores your data, system, and log files.
   Set Password	Set Now Set Later	The password of the root user. You can set a password immediately or reset it during the running of the instance. For more information, see Set a password. The password must contain at least three types of the following characters: uppercase letters, lowercase letters, digits, and special characters. Special characters include ! # $ % ^ & * ( ) _ + - = The password must be 8 to 32 characters in length.
   Purchase quantity	Duration	Subscription: Select the duration and quantity for the subscription-based instance to be purchased. You can select one to nine months for the subscription period on a monthly basis, or one to three years for the subscription period on a yearly basis. Pay-As-You-Go: Select the quantity for the Pay-As-You-Go instance to be purchased with the same configuration. You can select an integer in the range of 1 to 10.
   	Quantity

6. Click Buy Now to go to the Confirm Order page.
7. On the Confirm Orderpage the appears, read and select the terms of service, and complete the payment as prompted.

View the created instance

1. Log on to the ApsaraDB for MongoDB console.
2. In the upper-left corner of the page, select the region where your instance resides.
   
3. In the left-side navigation pane, click Replica Set Instances.

Troubleshoot if you cannot find the instance