Are you tired of manually backing up your Postgres database and worrying about the safety of your sensitive data? Well, worry no more! In this article, I'll walk you through how to use Docker and Cron to automatically back up your Postgres database, keeping your data safe and secure. Here is the Docker Compose file that we'll be using to set up our PostgreSQL container and backup container: version: '3.8'
services:
  db-postgresql:
    image: postgres:13
    restart: always
    environment:
      POSTGRES_USER: root
      POSTGRES_PASSWORD: P@ASSW0RD654
      POSTGRES_DB: bitbucket
      PGDATA: /var/lib/postgresql/data/pgdata
      POSTGRES_SYNCHRONOUS_COMMIT: 'on'
      POSTGRES_WAL_LEVEL: 'replica'
    ports:
      - published: 7649
        target: 5432
    volumes:
      - postgresql_data:/var/lib/postgresql/data/pgdata

  backup:
    image: postgres:13
    depends_on:
      - db-postgresql
    volumes:
      - ./backup:/backup
    command: >
      bash -c "while true; do
        PGPASSWORD=$$POSTGRES_PASSWORD pg_dump -h db-postgresql -U $$POSTGRES_USER -Fc $$POSTGRES_DB > /backup/$$(date +%Y-%m-%d-%H-%M-%S).dump
        echo ""Backup done at $$(date +%Y-%m-%d_%H:%M:%S)""
        ls -1 /backup/*.dump | head -n -2 | xargs rm -f
        sleep 86400
      done"
    environment:
      POSTGRES_USER: root
      POSTGRES_PASSWORD: P@ASSW0RD654
      POSTGRES_DB: bitbucket

volumes:
  postgresql_data:
    external: true let's take a look at the code. We have two services defined: , which runs the Postgres database, and , which is responsible for backing up the database. First things first, db-postgresql backup The service uses the official Postgres image, with version 13 specified. We're also defining some environment variables, including the database name, username, and password. db-postgresql Note that we're using a strong password, so make sure to choose a secure password for your own setup! The service depends on the service, meaning that it won't start until the database is up and running. We're using a Postgres image here as well, with version 13 specified. backup db-postgresql Now, let's take a closer look at the backup command. We're using a Bash script to backup the database, which runs on a schedule using Cron. The script runs every 24 hours, thanks to the command. sleep 86400 The backup script uses the command to dump the database into a file. We're also including a timestamp in the filename, which is generated using the command. This means that each backup will have a unique filename, making it easy to keep track of multiple backups. pg_dump date We're also deleting old backups using the , , and commands. This ensures that we don't run out of disk space due to old backups. ls head xargs Finally, we're mounting a volume to the service, which maps to the directory on the host machine. This means that the backup files will be stored on the host machine, rather than in the container. backup ./backup And that's it! With this setup, you can rest assured that your Postgres database is being backed up regularly and securely. Whether you're working on a personal project or a production system, having a reliable backup strategy is essential for maintaining the safety and integrity of your data. So why not give this setup a try and enjoy the peace of mind that comes with knowing your data is protected?

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