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    Clone a database cluster in Kubernetes using a Cloud Storage backup

    Select a documentation version: This page shows you how to clone a database cluster in Kubernetes using a Cloud Storage backup of an AlloyDB Omni database cluster.

    The following workflow explains the steps used to clone:

    1. Create and apply the DBCluster manifest file on the target database cluster with the livenessProbe parameter disabled.
    2. Create and configure the pgbackrest.conf file to access the Cloud Storage backup.
    3. Use pgBackRest commands to verify you can access source backups.
    4. Use pgBackRest commands to restore the backup to the target database cluster.

    Before you begin

    • Make sure you have access to the full path of the Cloud Storage bucket where your source database cluster backup is stored. This is the same path you used when you created the BackupPlan resource for your source database cluster.
    • Create a target AlloyDB Omni database cluster. For more information about installing AlloyDB Omni on Kubernetes, see Create a database cluster .
    • Ensure you are logged in to the database as the postgres user.

    Create a database cluster in a target database cluster

    Create a database cluster by temporarily disabling the livenessProbe parameter while the restore process completes.

    1. Create the DBCluster resource manifest file:

        apiVersion 
 : 
  
 v1 
 kind 
 : 
  
 Secret 
 metadata 
 : 
  
 name 
 : 
  
 db-pw- DB_CLUSTER_NAME 
 
 type 
 : 
  
 Opaque 
 data 
 : 
  
  DB_CLUSTER_NAME 
 
 : 
  
 " ENCODED_PASSWORD 
" 
 --- 
 apiVersion 
 : 
  
 alloydbomni.dbadmin.goog/v1 
 kind 
 : 
  
 DBCluster 
 metadata 
 : 
  
 name 
 : 
  
  DB_CLUSTER_NAME 
 
 spec 
 : 
  
 primarySpec 
 : 
  
 availabilityOptions 
 : 
  
 livenessProbe 
 : 
  
 "Disabled" 
  
 adminUser 
 : 
  
 passwordRef 
 : 
  
 name 
 : 
  
 db-pw- DB_CLUSTER_NAME 
 
  
 resources 
 : 
  
 cpu 
 : 
  
  CPU_COUNT 
 
  
 memory 
 : 
  
  MEMORY_SIZE 
 
  
 disks 
 : 
  
 - 
  
 name 
 : 
  
 DataDisk 
  
 size 
 : 
  
  DISK_SIZE 
 
  
 storageClass 
 : 
  
 standard

      Replace the following:

      • DB_CLUSTER_NAME : the name of this database cluster—for example, my-db-cluster .

      • ENCODED_PASSWORD : the database login password for the default postgres user role, encoded as a base64 string—for example, Q2hhbmdlTWUxMjM= for ChangeMe123 .

      • CPU_COUNT : the number of CPUs available to each database instance in this database cluster.

      • MEMORY_SIZE : the amount of memory per database instance of this database cluster. We recommend setting this to 8 gigabytes per CPU. For example, if you set cpu to 2 earlier in this manifest, then we recommend setting memory to 16Gi .

      • DISK_SIZE : the disk size per database instance—for example, 10Gi .

    2. Apply the manifest file:

       kubectl  
apply  
-f  
 DBCLUSTER_FILENAME

      Replace the following:

      • DBCLUSTER_FILENAME : the name of the DBCluster manifest file created in the previous step.

    Use the kubectl describe command to verify that the database cluster resource is in the READY status.

    Configure the pgBackRest file

    Configure the pgBackRest file to enable the target database cluster to access the Cloud Storage bucket where source backups reside.

    1. In your target database cluster, find the database cluster pod details:

       kubectl  
get  
pod  
-l  
 "alloydbomni.internal.dbadmin.goog/dbcluster= DB_CLUSTER_NAME 
, alloydbomni.internal.dbadmin.goog/task-type=database"

      The response includes the name of the cluster database pod.

    2. Log into the pod:

         
kubectl  
 exec 
  
-ti  
 DATABASE_POD_NAME 
  
--  
/bin/bash

      Replace the following:

      • DATABASE_POD_NAME : the name of the database cluster pod from the previous step.

    3. Stop the pod before updating the pgBackRest configuration file:

       supervisorctl.par  
stop  
postgres

    4. Create a pgBackRest configuration file to access backups stored in Cloud Storage:

         
cat << 
EOF > 
/backup/pgbackrest.conf  
 [ 
db ] 
  
pg1-path = 
/mnt/disks/pgsql/data  
pg1-socket-path = 
/tmp  
pg1-user = 
pgbackrest  
 [ 
global ] 
  
log-path = 
/obs/pgbackrest  
log-level-file = 
info  
repo1-type = 
gcs  
repo1-gcs-bucket = 
 GCS_SOURCE_BACKUP_BUCKET_NAME 
  
repo1-path = 
 GCS_SOURCE_BACKUP_BUCKET_PATH 
  
repo1-storage-ca-file = 
/scripts/ca-certificates.crt  
repo1-retention-full = 
 9999999 
  
repo1-gcs-key-type = 
auto

      Replace the following:

      • GCS_SOURCE_BACKUP_BUCKET_NAME : the name of the Cloud Storage bucket that you created when creating the BackupPlan resource manifest file for the source database cluster. This is not the full URL to the bucket; don't prefix the bucket name with gs:// .
      • GCS_SOURCE_BACKUP_BUCKET_PATH : the path of the directory that the AlloyDB Omni operator writes backups into, within the Cloud Storage bucket for the source database cluster. The path must be absolute, beginning with / .

      The repo1-gcs-key-type is set to auto to use the instance's service account. For more information about other options, see Cloud Storage Repository Key Type Option .

    Verify source backups in the target database cluster

    Run pgBackRest commands to verify that the source database cluster backups are accessible on the target database cluster.

     pgbackrest  
--config-path = 
/backup  
--stanza = 
db  
--repo = 
 1 
  
info

    The following is a sample response:

     stanza: db
      status: ok
      cipher: none
      db (current)
          wal archive min/max (15): 000000010000000000000002/00000001000000000000000D
          full backup: 20240213-231400F
              timestamp start/stop: 2024-02-13 23:14:00+00 / 2024-02-13 23:17:14+00
              wal start/stop: 000000010000000000000003 / 000000010000000000000003
              database size: 38.7MB, database backup size: 38.7MB
              repo1: backup set size: 4.6MB, backup size: 4.6MB
          incr backup: 20240213-231400F_20240214-000001I
              timestamp start/stop: 2024-02-14 00:00:01+00 / 2024-02-14 00:00:05+00
              wal start/stop: 00000001000000000000000D / 00000001000000000000000D
              database size: 38.7MB, database backup size: 488.3KB
              repo1: backup set size: 4.6MB, backup size: 84.2KB
              backup reference list: 20240213-231400F

    The timestamps in the response are used either to restore the full backup or to restore from a point in time from the recovery window.

    Restore the backup in the target database cluster

    After you identify the backup or a point in time you want to restore to, run pgBackRest commands in your target database cluster. For more information about these commands, see Restore Command .

    The following are some sample pgBackRest restore commands:

    • Restore from a backup

       pgbackrest  
--config-path = 
/backup  
--stanza = 
db  
--repo = 
 1 
  
restore  
--set = 
 20240213 
-231400F  
--type = 
immediate  
--target-action = 
promote  
--delta  
--link-all  
--log-level-console = 
info

    • Restore from a point in time

       pgbackrest  
--config-path = 
/backup  
--stanza = 
db  
--repo = 
 1 
  
restore  
--target = 
 "2024-01-22 11:27:22" 
  
--type = 
 time 
  
--target-action = 
promote  
--delta  
--link-all  
--log-level-console = 
info

    Restart the pod

    After the restore command completes successfully, you can start the postgres process.

     supervisorctl.par  
start  
postgres

    After the postgres process starts, you can connect to the primary instance and run queries to verify that the data is restored from the backup. For more information, see Connect to AlloyDB Omni running on Kubernetes .

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