/postgres-backup-s3

PostgreSQL Docker companion for periodic backups to S3

Primary LanguageShellMIT LicenseMIT

Introduction

This project provides Docker images to periodically back up a PostgreSQL database to AWS S3, and to restore from the backup as needed.

Usage

Backup

postgres:
  image: postgres:13
  environment:
    POSTGRES_USER: user
    POSTGRES_PASSWORD: password

pg_backup_s3:
  image: eeshugerman/postgres-backup-s3:13
  environment:
    SCHEDULE: '@weekly'
    PASSPHRASE: passphrase
    S3_REGION: region
    S3_ACCESS_KEY_ID: key
    S3_SECRET_ACCESS_KEY: secret
    S3_BUCKET: my-bucket
    S3_PREFIX: backup
    POSTGRES_HOST: postgres
    POSTGRES_DATABASE: dbname
    POSTGRES_USER: user
    POSTGRES_PASSWORD: password
  • Images are tagged by the major PostgreSQL version they support: 9, 10, 11, 12, or 13.
  • The SCHEDULE variable determines backup frequency. See go-cron schedules documentation here.
  • If PASSPHRASE is provided, the backup will be encrypted using GPG.
  • Run docker exec <container name> sh backup.sh to trigger a backup ad-hoc

Restore

WARNING: DATA LOSS! All database objects will be dropped and re-created.

... from latest backup

docker exec <container name> sh restore.sh

NOTE: If your bucket has more than a 1000 files, the latest may not be restored -- only one S3 ls command is used

... from specific backup

docker exec <container name> sh restore.sh <timestamp>

Acknowledgements

This project is a fork and re-structuring of @schickling's postgres-backup-s3 and postgres-restore-s3.

Fork goals

  • dedicated repository
  • automated builds
  • support multiple PostgreSQL versions
  • backup and restore with one image
  • support encrypted (password-protected) backups
  • option to restore from specific backup by timestamp

Other changes

  • uses pg_dump's custom format (see docs)
  • doesn't use Python 2
  • backup blobs and all schemas by default
  • drop and re-create all database objects on restore
  • some env vars renamed or removed
  • filter backups on S3 by database name