Backup Migration Between Regions or Redis Versions

Application Scenarios

Use the DCS console to migrate Redis data from Redis of another cloud or self-hosted Redis to DCS for Redis.

Simply download the source Redis data and then upload the data to an OBS bucket in the same region as the target DCS Redis instance. After you have created a migration task on the DCS console, DCS will read data from the OBS bucket and data will be migrated to the target instance.

.aof, .rdb, .zip, and .tar.gz files can be uploaded to OBS buckets. You can directly upload .aof and .rdb files or compress them into .zip or .tar.gz files before uploading.

Prerequisites

• The OBS bucket must be in the same region as the target DCS Redis instance.
• The data files to be uploaded must be in the .aof, .rdb, .zip, or .tar.gz format.
• To migrate data from a single-node or master/standby Redis instance of another cloud, create a backup task and download the backup file.
• To migrate data from a cluster Redis instance of another cloud, download all backup files, upload all of them to the OBS bucket, and select all of them for the migration. Each backup file contains data for a shard of the instance.

Step 1: Prepare the Target DCS Redis Instance

• If a target DCS Redis instance is not available, create one first. For details, see Buying a DCS Redis Instance.
• If you already have a DCS Redis instance, you do not need to create one again, but you need to clear the instance data before the migration. For details, see Clearing DCS Instance Data.

Step 2: Create an OBS Bucket and Upload Backup Files

1. Upload the backup data files to the OBS bucket by using OBS Browser+.

   If the backup file to be uploaded is smaller than 5 GB, go to step 2 to upload the file using the OBS console.

   If the backup file to be uploaded is larger than 5 GB, follow the instructions provided by OBS.

2. On the OBS console, upload the backup data files to the OBS bucket.
   Perform the following steps if the backup files are smaller than 5 GB:

   1. Create an OBS bucket.

      When creating an OBS bucket, pay attention to the configuration of the following parameters. For details on how to set other parameters, see Creating a Bucket in OBS User Guide.

      1. Region:

         The OBS bucket must be in the same region as the target DCS Redis instance.

      2. Storage Class: Available options are Standard, Infrequent Access, and Archive.

         Do not select Archive. Otherwise, the migration will fail.

      3. Click Create Now.
   2. In the bucket list, click the bucket created in 2.a.
   3. In the navigation pane, choose Objects.
   4. On the Objects tab page, click Upload Object.
   5. Specify Storage Class.

      Do not select Archive. Otherwise, the migration will fail.

   6. Upload the objects.

      Drag files or folders to the Upload Object area or click add file.

      A maximum of 100 files can be uploaded at a time. The total size cannot exceed 5 GB.

      Figure 1 Uploading objects in batches
      
   7. (Optional) Select KMS encryption to encrypt the uploaded files.
   8. Click Upload.

Step 3: Create a Migration Task

1. Log in to the DCS console.
2. In the navigation pane, choose Data Migration.
3. Click Create Backup Import Task.
4. Enter the task name and description.
5. In the Source Redis area, select OBS Bucket for Data Source and then select the OBS bucket to which you have uploaded backup files.
6. You can specify Source DB to migrate data from the specified DB in the source backup file. For example, if you enter 5, only data in DB5 will be migrated. To migrate all databases, do not specify Source DB.
7. Enable Multi-DB Proxy Cluster if the source Redis is a multi-DB (multi-db set to yes) Proxy Cluster DCS Redis instance.
8. Click Add Backup and select the backup files to be migrated.
9. In the Target Redis area, select the Target Redis Instance prepared in Step 1: Prepare the Target DCS Redis Instance.
10. If the target Redis instance has a password, enter the password and click Test Connection to check whether the password is correct. If the instance is not password-protected, click Test Connection directly.
11. For Target DB, you can specify a DB in the target Redis to migrate data to. For example, if you enter 5, data will be migrated to DB5 of the target Redis. If you do not specify a DB, data will be migrated to a DB corresponding to the source DB.
    

    • If the source Redis is multi-DB and the target is single-DB (DB0), either ensure that all source data is in DB0, or specify a source DB and set the target DB to 0. Otherwise, migration will fail.
    • For details about DB in DCS for Redis, see Does DCS for Redis Support Multi-DB?

12. Click Next.
13. Confirm the migration task details and click Submit.

    Go back to the data migration task list. After the migration is successful, the task status changes to Successful.