Backing Up CDL Data

Scenario

To ensure CDL service data security routinely or before a major operation on CDL (such as upgrade or migration), you need to back up CDL data. The backup data can be used to recover the system if an exception occurs or the operation has not achieved the expected result, minimizing the adverse impacts on services.

CDL data is stored in DBService and Kafka. You can create DBService and Kafka backup tasks on MRS Manager to back up CDL data. Both automatic and manual backup tasks are supported.

Prerequisites

• If data needs to be backed up to the remote HDFS, you have prepared a standby cluster for data backup. The authentication mode of the standby cluster is the same as that of the active cluster. For other backup modes, you do not need to prepare the standby cluster.
• If the active cluster is deployed in security mode and the active and standby clusters are not managed by the same MRS Manager, mutual trust has been configured. For details, see Configuring Cross-Manager Mutual Trust Between Clusters. If the active cluster is deployed in normal mode, no mutual trust is required.
• Cross-cluster replication has been configured for the active and standby clusters. For details, see Enabling Cross-Cluster Replication.
• Time is consistent between the active and standby clusters and the NTP services on the active and standby clusters use the same time source.
• The backup type, period, policy, and other specifications have been planned based on the service requirements and you have checked whether Data storage path/LocalBackup/ has sufficient space on the active and standby management nodes.
• If you want to back up data to NAS, you have deployed the NAS server in advance.
• If you want to back up data to OBS, you have connected the current cluster to OBS and have the permission to access OBS.

Procedure

1. On MRS Manager, choose O&M > Backup and Restoration > Backup Management.
2. Click Create.
3. Set Name to the name of the backup task.
4. Select the cluster to be operated from Backup Object.
5. Set Mode to the type of the backup task.

   Periodic indicates that the backup task is executed by the system periodically. Manual indicates that the backup task is executed manually.

   Table 1 Periodic backup parameters

   Parameter	Description
   Started	Indicates the time when the task is started for the first time.
   Period	Indicates the task execution interval. The options include Hours and Days.
   Backup Policy	Full backup at the first time and incremental backup subsequently Full backup every time Full backup once every n times NOTE: Incremental backup is not supported when Manager data and component metadata are backed up. Only Full backup every time is supported. If Path Type is set to NFS or CIFS, incremental backup cannot be used. When incremental backup is used for NFS or CIFS backup, the latest full backup data is updated each time the incremental backup is performed. Therefore, no new recovery point is generated.

6. Set Configuration to DBService and Kafka.
   

   If there are multiple DBService or Kafka services, all DBService or Kafka services are backed up by default. You can click Assign Service to specify the services to be backed up.

7. Set Path Type of DBService to a backup directory type. For details about how to set the parameters, see 7.
8. Set Path Type of Kafka to a backup directory type. For details about how to set the parameters, see 7.
9. Click OK.
10. In the Operation column of the created task in the backup task list, click More and select Back Up Now to execute the backup task.

    After the backup task is executed, the system automatically creates a subdirectory for each backup task in the backup directory. The format of the subdirectory name is Backup task name_Task creation time, and the subdirectory is used to save data source backup files.

    The format of the backup file name is Version_Data source_Task execution time.tar.gz.