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PostgreSQL backup configuration

There are the following jobs for backups management:

  • CronJob for backups creation (running by a schedule postgresBackup.schedule)

  • CronJob for backups rotation (running by a schedule postgresBackup.rotationSchedule)

Backup configuration values (postgresBackup prefix):

  • enabled - boolean flag for enabling/disabling backups

  • schedule - cron-like schedule for backups

  • rotationSchedule - cron-like schedule for backups rotation

  • maxNumber - maximum number of backups to store

  • image - Docker image containing potgres and minio (client) binaries (opennode/postgres-minio by default)

Backups restoration

To restore backups you need to connect to the restoration pod. The major prerequisite for this is stopping the Waldur backend pods to avoid errors. NB: During restoration process, the site will be unavailable. For this, please execute the following lines in the Kubernetes node:

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# Stop all the API pods
kubectl scale --replicas=0 deployment/waldur-mastermind-api
# Stop all the Celery worker pods
kubectl scale --replicas=0 deployment/waldur-mastermind-worker
# Connect to the restoration pod
kubectl exec -it deployment/waldur-db-restore -- bash

This will give you access to a terminal of a restoration pod. In this shell, please, execute the command:

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db-backup-minio-auth

This will print the recent 5 backups available for restoration. Example:

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root@waldur-db-restore-ff7f586bb-nb8jt:/# db-backup-minio-auth
[+] LOCAL_PG_BACKUPS_DIR :
[+] MINIO_PG_BACKUPS_DIR : pg/data/backups/postgres
[+] Setting up the postgres alias for minio server (http://minio.default.svc.cluster.local:9000)
[+] Last 5 backups
[2022-12-01 05:00:02 UTC]  91KiB backup-2022-12-01-05-00.sql.gz
[2022-11-30 05:00:02 UTC]  91KiB backup-2022-11-30-05-00.sql.gz
[2022-11-29 05:00:02 UTC]  91KiB backup-2022-11-29-05-00.sql.gz
[2022-11-28 16:30:37 UTC]  91KiB backup-2022-11-28-16-30.sql.gz
[2022-11-28 16:28:27 UTC]  91KiB backup-2022-11-28-16-28.sql.gz
[+] Finished

As you can see, the backup name contains the date and time when it was created in YYYY-mm-dd-HH-MM format. You can freely choose the one you need.

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  db-backup-minio-auth
  export BACKUP_FILENAME=<SELECTED_BACKUP>
  mc cp pg/$MINIO_BUCKET/backups/postgres/$BACKUP_FILENAME backup.sql.gz
  gzip -d backup.sql.gz
  # Be careful: the next lines have potentially danger operations
  psql -d postgres -c "SELECT pg_terminate_backend(pg_stat_activity.pid) FROM pg_stat_activity WHERE pg_stat_activity.datname = 'waldur' AND pid <> pg_backend_pid();"
  psql -d postgres -c 'DROP DATABASE waldur;'
  createdb waldur
  psql -f backup.sql
  rm backup.sql

Restoration from external backup

If you want to use a pre-created backup from an external system, copy the backup file:

  1. Copy the backup file to your local machine

  2. Copy the file to pod

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    export RESTORATION_POD_NAME=$(kubectl get pods --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | grep restore)
kubectl cp <BACKUP_FILE> $RESTORATION_POD_NAME:/tmp/backup.sql.gz

  3. Connect to pod's terminal

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    kubectl exec -it $RESTORATION_POD_NAME -- bash

  4. Apply the backup

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    gzip -d /tmp/backup.sql.gz
# Be careful: the next lines have potentially danger operations
psql -d postgres -c "SELECT pg_terminate_backend(pg_stat_activity.pid) FROM pg_stat_activity WHERE pg_stat_activity.datname = 'waldur' AND pid <> pg_backend_pid();"
psql -d postgres -c 'DROP DATABASE waldur;'
createdb waldur
psql -f /tmp/backup.sql
rm /tmp/backup.sql
Last update: 2023-06-19