Introduction

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

Credit where due

This repository 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
merge backup and restore images
support encrypted (password-protected) backups
option to restore from specific backup by timestamp

other changes:

uses pg_dump's custom format (see docs)
backup blobs and all schemas by default
recreate all database objects on restore
some env vars renamed
only scheduled backups supported, not ad-hoc
filter backups on S3 by database name

Usage

Backup

postgres:
  image: postgres:11
  environment:
    POSTGRES_USER: user
    POSTGRES_PASSWORD: password

pg_backup_s3:
  image: eeshugerman/postgres-backup-s3:11
  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_DATABASE: dbname
    POSTGRES_USER: user
    POSTGRES_PASSWORD: password

Images are tagged by the major PostgreSQL version they support: 9, 10, 11, or 12.
The SCHEDULE variable determines backup frequency. See go-cron schedules documentation here.
If PASSPHRASE is provided, the backup will be encrypted using GPG.

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>