ApsaraDB for MongoDB:Create a replica set instance

Precautions

• Your ApsaraDB for MongoDB instance and ECS instance are deployed in the same region.
• Your ApsaraDB for MongoDB instance and ECS instance use the same network type.
  Note

  • The same zone is recommended because the same zone reduces network latency.
  • VPC is recommended because VPC provides higher security.
  • If the network type is VPC, you must ensure that they use the same VPC ID.
  • If you want to use VPC, but the network type of the ECS instance is classic network, you can change the network type of the ECS instance to VPC. For more information, see Migrate ECS instances from the classic network to a VPC.

Limits

• ApsaraDB for MongoDB instances that run MongoDB 4.2 or earlier can be created only in the following regions and zones:
  • China (Hangzhou): Hangzhou Zone G, Zone H, Zone I, Zone J, and Zone K
  • China (Shanghai): Shanghai Zone B, Zone D, Zone G, and Zone L
  • China (Qingdao): Qingdao Zone B and Zone C
  • China (Beijing): Beijing Zone E, Zone F, Zone H, Zone K, and Zone L
  • China (Zhangjiakou): Zhangjiakou Zone A, Zone B, and Zone C
  • China (Hohhot): Hohhot Zone A and Zone B
  • China (Ulanqab): Ulanqab Zone A, Zone B, and Zone C
  • China (Shenzhen): Shenzhen Zone A, Zone C, Zone D, Zone E, Zone F, and Zones (C + D + E)
  • China (Heyuan): Heyuan Zone A and Zone B
  • China (Guangzhou): Guangzhou Zone A
  • China (Chengdu): Chengdu Zone A and Zone B
  • China (Hong Kong): Hongkong Zone B, Zone C, Zone D, and Zones (B + C + D)
  • Singapore: Singapore Zone A, Zone B, Zone C, and Zones (A + B + C)
  • Australia (Sydney): Sydney Zone A and Zone B
  • Malaysia (Kuala Lumpur): Kuala Lumpur Zone A and Zone B
  • Indonesia (Jakarta): Jakarta Zone A, Zone B, and Zone C
  • Philippines (Manila): Manila Zone A
  • Japan (Tokyo): Tokyo Zone A, Zone B, or Zone C
  • India (Mumbai): Mumbai Zone A and Zone B
  • UAE (Dubai): Dubai Zone A
  • US (Silicon Valley): Silicon Valley Zone A and Zone B
  • US (Virginia): Virginia Zone A and Zone B
  • UK (London): London Zone A and Zone B
  • Germany (Frankfurt): Frankfurt Zone A, Zone B, and Zone C
• ApsaraDB for MongoDB instances that run MongoDB 4.4 or later can be created only in the following regions and zones:
  • China (Hangzhou): Hangzhou Zone G, Zone H, and Zone I
  • China (Shanghai): Shanghai Zone B and Zone G
  • China (Qingdao): Qingdao Zone C
  • China (Beijing): Beijing Zone F and Zone H
  • China (Zhangjiakou): Zhangjiakou Zone A and Zone C
  • China (Hohhot): Hohhot Zone B
  • China (Ulanqab): Ulanqab Zone A, Zone B, and Zone C
  • China (Shenzhen): Shenzhen Zone E
  • China (Heyuan): Heyuan Zone A and Zone B
  • China (Chengdu): Chengdu Zone A and Zone B
  • China (Hong Kong): Hongkong Zone B, Zone C, and Zone D
  • Singapore: Singapore Zone A, Zone B, and Zone C
  • Malaysia (Kuala Lumpur): Kuala Lumpur Zone B
  • Indonesia (Jakarta): Jakarta Zone A, Zone B, and Zone C
  • Thailand (Bangkok): Bangkok Zone A
  • Japan (Tokyo): Tokyo Zone A, Zone B, or Zone C
  • South Korea (Seoul): Seoul Zone A
  • India (Mumbai): Mumbai Zone B
  • US (Silicon Valley): Silicon Valley Zone B
  • UK (London): London Zone A and Zone B
  • US (Virginia): Virginia Zone A and Zone B
  • Germany (Frankfurt): Frankfurt Zone A, Zone B, and Zone C

Billing

• Subscription: If you purchase a subscription instance, you must pay an upfront fee for the instance.
• Pay-as-you-go: A pay-as-you-go instance is charged per hour based on the configuration of the instance. Fees are automatically deducted from your Alibaba Cloud account.

Procedure

After you perform the following steps, ApsaraDB for MongoDB automatically creates one or more standalone instances. No manual operations are required.

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. Set Product Type to Replica Set (Subscription) or Replica Set (Pay-as-you-go) as needed.
5. Configure the parameters described in the following table.

   Parameter	Description
   Region	The region in which you want to deploy the replica set instance. Note After the replica set instance is created, you cannot change the region of the instance. Proceed with caution. If your application is deployed on an Elastic Compute Service (ECS) instance, we recommend that you deploy the replica set instance in the region where the ECS instance resides. If the replica set instance and the ECS instance reside in different regions, your application cannot communicate with the replica set instance over an internal network.
   Zone Type	The zone type of the instance. Single-zone: The primary and secondary nodes are deployed in one zone. Multi-zone: primary and secondary nodes are deployed in different zones to meet the requirements for zone-disaster recovery.. Note ApsaraDB for MongoDB instances that run MongoDB 4.2 or earlier allow you to select only Single-zone. However, you can configure Zone to deploy the replica set instance in multiple zones. To implement multi-zone deployment, you must select zones in the following format: Region (Zone 1 + Zone 2 + Zone 3). Example: Shenzhen Zone (C + D + E).
   Zone	The zone in which you want to deploy the replica set instance. If you set Zone Type to Multi-zone, the selected zones are for the primary node. You can select only one of the following zones: Hangzhou Zone G, Zone H, and Zone I Shanghai Zone B, Zone G, and Zone L Beijing Zone F, Zone H, Zone L, and Zone K Shenzhen Zone D, Zone E, and Zone F Hongkong Zone B, Zone C, and Zone D Ulanqab Zone A, Zone B, and Zone C Singapore Zone A, Zone B, and Zone C Jakarta Zone A, Zone B, and Zone C Frankfurt Zone A, Zone B, and Zone C Tokyo Zone A, Zone B, or Zone C Note If your application is deployed on an ECS instance, we recommend that you deploy the replica set instance in the zone where the ECS instance resides to reduce network latency. If a replica set instance runs MongoDB 4.2 or earlier, you can migrate the instance to a different zone. For more information, see Migrate an ApsaraDB for MongoDB instance to different zones in the same region.
   Secondary Zone 1	If you set Zone Type to Multi-zone, you must select the zone where the secondary node is deployed. Secondary Zone 1 cannot be the same as Zone. You can select only one of the following zones: Hangzhou Zone G, Zone H, and Zone I Shanghai Zone B, Zone G, and Zone L Beijing Zone F, Zone H, Zone L, and Zone K Shenzhen Zone D, Zone E, and Zone F Hongkong Zone B, Zone C, and Zone D Ulanqab Zone A, Zone B, and Zone C Singapore Zone A, Zone B, and Zone C Jakarta Zone A, Zone B, and Zone C Frankfurt Zone A, Zone B, and Zone C Tokyo Zone A, Zone B, or Zone C
   Secondary Zone 2	If you set Zone Type to Multi-zone, you must also select the zone where the hidden node is deployed. Secondary Zone 2 cannot be the same as Zone or Secondary Zone 1. You can select only one of the following zones: Hangzhou Zone G, Zone H, and Zone I Shanghai Zone B, Zone G, and Zone L Beijing Zone F, Zone H, Zone L, and Zone K Shenzhen Zone D, Zone E, and Zone F Hongkong Zone B, Zone C, and Zone D Ulanqab Zone A, Zone B, and Zone C Singapore Zone A, Zone B, and Zone C Jakarta Zone A, Zone B, and Zone C Frankfurt Zone A, Zone B, and Zone C Tokyo Zone A, Zone B, or Zone C
   Engine Version	The MongoDB version of the replica set instance. If you set Zone Type to Multi-zone, you can select only MongoDB 6.0, MongoDB 5.0, and MongoDB 4.4. Note If the value of the Zone, Secondary Zone 1, or Secondary Zone 2 parameter that you select does not support the multi-zone deployment, the Engine Version parameter is not displayed. The replica set instance cannot be created. When a replica set instance is in the Running state, you can manually upgrade the MongoDB version of the instance. For more information, see Upgrade MongoDB versions.
   Active-standby Nodes	The number of active-standby nodes in the replica set instance. Set this parameter based on your business requirements. Note If you set Engine Version to MongoDB 4.4 or later, Active-standby Nodes can be set only to 3. If you create a multi-zone replica set instance, Active-standby Nodes can be set only to 3.
   Read-only Nodes	The number of read-only nodes in the replica set instance. Set this parameter based on your business requirements. For more information about read-only nodes, see Read-only nodes. Note The number of read-only nodes cannot be increased for replica set instances that run MongoDB 4.4 or later.
   Storage Engine	The storage engine of the replica set instance. This parameter can be set only to WiredTiger.
   Storage Type	The storage type of the replica set instance. Set this parameter based on your business requirements. ESSDs come in the following three performance levels (PLs): ESSD PL1: This is the basic PL of ESSDs. ESSD PL2: An ESSD of PL2 delivers IOPS and throughput that are approximately two times the IOPS and throughput delivered by an ESSD of PL1. ESSD PL3: An ESSD of PL3 delivers IOPS that is up to 20 times the IOPS delivered by an ESSD of PL1. An ESSD of PL3 also delivers throughput that is up to 11 times the throughput delivered by an ESSD of PL1. ESSDs of PL3 are suitable for business scenarios in which concurrent requests must be processed with high I/O performance and at low read and write latencies. Note For more information about performance differences of ESSDs, such as differences in capacity range, maximum IOPS per disk, and maximum throughput per disk, see ESSDs. Local SSD: A local SSD resides on the same host as the database engine. You can store data on local SSDs to reduce I/O latencies.
   Network Type	The type of network in which you want to deploy the replica set instance. This parameter can be set only to VPC. Note If your application is deployed on an ECS instance, you must make sure that the ECS instance is in a VPC. This ensures network connectivity between your application and the replica set instance.
   VPC	The ID of the virtual private cloud (VPC) in which you want to deploy the replica set instance. If no VPCs are available, you can create a VPC in the VPC console. For more information, see Create and manage a VPC.
   vSwitch	The ID of the vSwitch to which the replica set instance connects. If no vSwitches are available, you can create a vSwitch in the VPC console. For more information, see Create and manage a vSwitch.
   Specifications	The number of CPU cores and memory capacity for the replica set instance. For more information about the specifications that are supported by replica set instances, see Instance types.
   Storage	The storage capacity of each node in the replica set instance. Note This parameter specifies the storage capacity of each node, rather than the sum of the storage capacity of all nodes. The storage capacity is used to store the data, system, and log files of the replica set instance.
   Username	This parameter can set only to root. Note This value indicates the root account of the admin database.
   Set Password	The time at which you want to set the password of the root account. Valid values: Set Now: You want to immediately set the password of the root account. Set Later: You want to set the password of the root account after the replica set instance is created. For more information, see (Optional) Reset a password.
   Password	The password of the root account. If you set the Set Password parameter to Set Now, you must set the password of the root account when you create the replica set instance. You must set the password in compliance with the following rules: The password must contain at least three of the following character types: uppercase letters, lowercase letters, digits, and specific special characters. These special characters include ! @ # $ % ^ & * ( ) _ + - = The password must be 8 to 32 characters in length.
   Duration	The subscription duration of the replica set instance. This parameter is available only when you create a subscription instance. Valid values: 1 Month, 2 Months, 3 Months, 4 Months, 5 Months, 6 Months, 7 Months, 8 Months, 9 Months, 1 Year, 2 Years, 3 Years, 5 Years. Note If you want to enable auto-renewal for the replica set instance, select Auto-renewal and make sure that you have sufficient balance within your account before the system automatically renews the instance.
   Quantity	The number of replica set instances that you want to create. All the created replica set instances have the same specifications. Valid values: 1 to 10.

6. Pay for the replica set instance based on the billing method of the instance.

   Billing method	Procedure
   Subscription	Complete the parameter settings and click Buy Now. On the Confirm Order page, check the parameter settings. Then, read MongoDB Replica Set (Subscription) Agreement of Service and select I have read and agree to MongoDB Replica Set (Subscription) Agreement of Service. Click Pay. On the Purchase page, complete the payment. Note You can also click Add to Cart to pay for orders in the cart in a lump sum. For more information, see Pay for orders in the cart.
   Pay-as-you-go	Complete the parameter settings and click Buy Now. On the Confirm Order page, check the parameter settings. Then, read MongoDB Replica Set (Pay-as-you-go) Agreement of Service and select I have read and agree to MongoDB Replica Set (Pay-as-you-go) Agreement of Service. Click Activate Now. The system collects the amount due within the next hour.

7. Check whether the replica set instance is created.
   1. After you complete the payment, click Console to go to the ApsaraDB for MongoDB console.
   2. In the upper-left corner of the page, select the resource group and region in which the replica set instance resides.
   3. In the left-side navigation pane, click Replica Set Instances.
   4. In the instance list that appears, check whether the standalone instance that you created is displayed.
      • If the standalone instance is displayed, the instance is created. If the standalone instance is in the Running state, the instance is running.
      • If the standalone instance is not displayed, wait for 10 to 15 minutes. Then, refresh the page. If the standalone instance is still not displayed, check whether the issues that are described in the following table occur. If none of the issues occur, contact Alibaba Cloud technical support.
        The following table describes the possible causes of and solutions to the issues due to which the created standalone instance is not displayed.

        Cause	Solution
        The standalone instance does not belong to the region that you select.	In the upper-left corner of the ApsaraDB for MongoDB console, select the resource group and region to which the standalone instance belongs.
        The standalone instance does not use the instance architecture that you select.	In the left-side navigation pane of the ApsaraDB for MongoDB console, click Replica Set Instances.
        The standalone instance is not created due to insufficient resources.	The system may fail to create the standalone instance due to insufficient resources. After you confirm that the payment is refunded, try to create an instance in another zone.

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