Back up Data to GCS Using BR

This document describes how to back up the data of a TiDB cluster in Kubernetes to Google Cloud Storage (GCS).

The backup method described in this document is implemented based on CustomResourceDefinition (CRD) in TiDB Operator. For the underlying implementation, BR is used to get the backup data of the TiDB cluster, and then send the data to the AWS storage. BR stands for Backup & Restore, which is a command-line tool for distributed backup and recovery of the TiDB cluster data.

Usage scenarios

If you have the following backup needs, you can use BR to make an ad-hoc backup or scheduled full backup of the TiDB cluster data to GCS.

  • To back up a large volume of data at a fast speed
  • To get a direct backup of data as SST files (key-value pairs)

For other backup needs, refer to Backup and Restore Overview to choose an appropriate backup method.

Back Up Data Using BR - 图1Note

  • BR is only applicable to TiDB v3.1 or later releases.
  • Data that is backed up using BR can only be restored to TiDB instead of other databases.

Ad-hoc backup

Ad-hoc backup supports both full backup and incremental backup.

To get an Ad-hoc backup, you need to create a Backup Custom Resource (CR) object to describe the backup details. Then, TiDB Operator performs the specific backup operation based on this Backup object. If an error occurs during the backup process, TiDB Operator does not retry, and you need to handle this error manually.

This document provides an example about how to back up the data of the demo1 TiDB cluster in the test1 Kubernetes namespace to GCS. The following are the detailed steps.

Step 1: Prepare for an ad-hoc backup

  1. Download backup-rbac.yaml, and execute the following command to create the role-based access control (RBAC) resources in the test1 namespace:

    1. kubectl apply -f backup-rbac.yaml -n test1
  2. Grant permissions to the remote storage.

    Refer to GCS account permissions.

  3. For a TiDB version earlier than v4.0.8, you also need to complete the following preparation steps. For TiDB v4.0.8 or a later version, skip these preparation steps.

    1. Make sure that you have the SELECT and UPDATE privileges on the mysql.tidb table of the backup database so that the Backup CR can adjust the GC time before and after the backup.

    2. Create the backup-demo1-tidb-secret secret to store the root account and password to access the TiDB cluster:

      1. kubectl create secret generic backup-demo1-tidb-secret --from-literal=password=<password> --namespace=test1

Step 2: Perform an ad-hoc backup

  1. Create the Backup CR to back up cluster data to GCS as described below:

    1. kubectl apply -f backup-gcs.yaml

    The content of backup-gcs.yaml is as follows:

    1. ---
    2. apiVersion: pingcap.com/v1alpha1
    3. kind: Backup
    4. metadata:
    5. name: demo1-backup-gcs
    6. namespace: test1
    7. spec:
    8. # backupType: full
    9. # Only needed for TiDB Operator < v1.1.10 or TiDB < v4.0.8
    10. from:
    11. host: ${tidb-host}
    12. port: ${tidb-port}
    13. user: ${tidb-user}
    14. secretName: backup-demo1-tidb-secret
    15. br:
    16. cluster: demo1
    17. clusterNamespace: test1
    18. # logLevel: info
    19. # statusAddr: ${status-addr}
    20. # concurrency: 4
    21. # rateLimit: 0
    22. # checksum: true
    23. # sendCredToTikv: true
    24. # options:
    25. # - --lastbackupts=420134118382108673
    26. gcs:
    27. projectId: ${project_id}
    28. secretName: gcs-secret
    29. bucket: ${bucket}
    30. prefix: ${prefix}
    31. # location: us-east1
    32. # storageClass: STANDARD_IA
    33. # objectAcl: private

    When configuring the backup-gcs.yaml, note the following:

    • Since TiDB Operator v1.1.6, if you want to back up data incrementally, you only need to specify the last backup timestamp --lastbackupts in spec.br.options. For the limitations of incremental backup, refer to Use BR to Back up and Restore Data.
    • Some parameters in spec.br are optional, such as logLevel and statusAddr. For more information about BR configuration, refer to BR fields.
    • Some parameters in spec.gcs are optional, such as location, objectAcl, and storageClass. For more information about GCS configuration, refer to GCS fields.
    • For v4.0.8 or a later version, BR can automatically adjust tikv_gc_life_time. You do not need to configure spec.tikvGCLifeTime and spec.from fields in the Backup CR.
    • For more information about the Backup CR fields, refer to Backup CR fields.
  2. After you create the Backup CR, TiDB Operator starts the backup automatically. You can view the backup status by running the following command:

    1. kubectl get bk -n test1 -owide

Backup CR examples

Back up data of all clusters

  1. ---
  2. apiVersion: pingcap.com/v1alpha1
  3. kind: Backup
  4. metadata:
  5. name: demo1-backup-gcs
  6. namespace: test1
  7. spec:
  8. # backupType: full
  9. # Only needed for TiDB Operator < v1.1.10 or TiDB < v4.0.8
  10. # from:
  11. # host: ${tidb-host}
  12. # port: ${tidb-port}
  13. # user: ${tidb-user}
  14. # secretName: backup-demo1-tidb-secret
  15. br:
  16. cluster: demo1
  17. clusterNamespace: test1
  18. gcs:
  19. projectId: ${project_id}
  20. secretName: gcs-secret
  21. bucket: ${bucket}
  22. prefix: ${prefix}
  23. # location: us-east1
  24. # storageClass: STANDARD_IA
  25. # objectAcl: private

Back up data of a single database

The following example backs up data of the db1 database.

  1. ---
  2. apiVersion: pingcap.com/v1alpha1
  3. kind: Backup
  4. metadata:
  5. name: demo1-backup-gcs
  6. namespace: test1
  7. spec:
  8. # backupType: full
  9. # Only needed for TiDB Operator < v1.1.10 or TiDB < v4.0.8
  10. # from:
  11. # host: ${tidb-host}
  12. # port: ${tidb-port}
  13. # user: ${tidb-user}
  14. # secretName: backup-demo1-tidb-secret
  15. tableFilter:
  16. - "db1.*"
  17. br:
  18. cluster: demo1
  19. clusterNamespace: test1
  20. gcs:
  21. projectId: ${project_id}
  22. secretName: gcs-secret
  23. bucket: ${bucket}
  24. prefix: ${prefix}
  25. # location: us-east1
  26. # storageClass: STANDARD_IA
  27. # objectAcl: private

Back up data of a single table

The following example backs up data of the db1.table1 table.

  1. ---
  2. apiVersion: pingcap.com/v1alpha1
  3. kind: Backup
  4. metadata:
  5. name: demo1-backup-gcs
  6. namespace: test1
  7. spec:
  8. # backupType: full
  9. # Only needed for TiDB Operator < v1.1.10 or TiDB < v4.0.8
  10. # from:
  11. # host: ${tidb-host}
  12. # port: ${tidb-port}
  13. # user: ${tidb-user}
  14. # secretName: backup-demo1-tidb-secret
  15. tableFilter:
  16. - "db1.table1"
  17. br:
  18. cluster: demo1
  19. clusterNamespace: test1
  20. gcs:
  21. projectId: ${project_id}
  22. secretName: gcs-secret
  23. bucket: ${bucket}
  24. prefix: ${prefix}
  25. # location: us-east1
  26. # storageClass: STANDARD_IA
  27. # objectAcl: private

Back up data of multiple tables using the table filter

The following example backs up data of the db1.table1 table and db1.table2 table.

  1. ---
  2. apiVersion: pingcap.com/v1alpha1
  3. kind: Backup
  4. metadata:
  5. name: demo1-backup-gcs
  6. namespace: test1
  7. spec:
  8. # backupType: full
  9. # Only needed for TiDB Operator < v1.1.10 or TiDB < v4.0.8
  10. # from:
  11. # host: ${tidb-host}
  12. # port: ${tidb-port}
  13. # user: ${tidb-user}
  14. # secretName: backup-demo1-tidb-secret
  15. tableFilter:
  16. - "db1.table1"
  17. - "db1.table2"
  18. br:
  19. cluster: demo1
  20. clusterNamespace: test1
  21. gcs:
  22. projectId: ${project_id}
  23. secretName: gcs-secret
  24. bucket: ${bucket}
  25. prefix: ${prefix}
  26. # location: us-east1
  27. # storageClass: STANDARD_IA
  28. # objectAcl: private

Scheduled full backup

You can set a backup policy to perform scheduled backups of the TiDB cluster, and set a backup retention policy to avoid excessive backup items. A scheduled full backup is described by a custom BackupSchedule CR object. A full backup is triggered at each backup time point. Its underlying implementation is the ad-hoc full backup.

Step 1: Prepare for a scheduled full backup

The steps to prepare for a scheduled full backup are the same as that of Prepare for an ad-hoc backup.

Step 2: Perform a scheduled full backup

  1. Create a BackupSchedule CR to back up cluster data as described below:

    1. kubectl apply -f backup-schedule-gcs.yaml

    The content of backup-schedule-gcs.yaml is as follows:

    1. ---
    2. apiVersion: pingcap.com/v1alpha1
    3. kind: BackupSchedule
    4. metadata:
    5. name: demo1-backup-schedule-gcs
    6. namespace: test1
    7. spec:
    8. #maxBackups: 5
    9. #pause: true
    10. maxReservedTime: "3h"
    11. schedule: "*/2 * * * *"
    12. backupTemplate:
    13. # Only needed for TiDB Operator < v1.1.10 or TiDB < v4.0.8
    14. from:
    15. host: ${tidb_host}
    16. port: ${tidb_port}
    17. user: ${tidb_user}
    18. secretName: backup-demo1-tidb-secret
    19. br:
    20. cluster: demo1
    21. clusterNamespace: test1
    22. # logLevel: info
    23. # statusAddr: ${status-addr}
    24. # concurrency: 4
    25. # rateLimit: 0
    26. # checksum: true
    27. # sendCredToTikv: true
    28. gcs:
    29. secretName: gcs-secret
    30. projectId: ${project_id}
    31. bucket: ${bucket}
    32. prefix: ${prefix}
    33. # location: us-east1
    34. # storageClass: STANDARD_IA
    35. # objectAcl: private

    From the above in backup-schedule-gcs.yaml, you can see that the backupSchedule configuration consists of two parts. One is the unique configuration of backupSchedule, and the other is backupTemplate.

    • For the unique configuration of backupSchedule, refer to BackupSchedule CR fields.
    • backupTemplate specifies the configuration related to the cluster and remote storage, which is the same as the spec configuration of the Backup CR.
  2. After creating the scheduled full backup, use the following command to check the backup status:

    1. kubectl get bks -n test1 -owide

    Use the following command to check all the backup items:

    1. kubectl get bk -l tidb.pingcap.com/backup-schedule=demo1-backup-schedule-gcs -n test1

Delete the backup CR

If you no longer need the backup CR, refer to Delete the Backup CR.

Troubleshooting

If you encounter any problem during the backup process, refer to Common Deployment Failures.