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Backing up and Recovering PostgreSQL on CentOS

PostgreSQL is the world's most advanced open source database. Its stability, functionality, and extensibility make it a primary choice for an RDBMS solution. In this hands-on lab scenario you are the DBA for Awesome Company. You have built a PostgreSQL database backend to facilitate the development of a new web application. To make sure development and testing accurately reflect real life, you need to restore production data to a test environment. Performing the tasks of this lab will help you become familiar with backup and recovery for PostgreSQL databases. This includes performing backups, restoring backups, and scheduling backup jobs.

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Path Info

Clock icon Intermediate
Clock icon 30m
Clock icon Mar 20, 2020

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Table of Contents

  1. Challenge

    Restore a Backup

    • Become the postgres user:
      sudo su - postgres
    • Create the database to be restored:
      createdb acweb
    • Download the backup from GitHub:
    • Use pg_restore to restore the backup:
      pg_restore --dbname=acweb --verbose /var/lib/pgsql/acweb.tar
    • Launch psql and verify the data is present:
    • List the databases:
    • Connect to acweb:
    \c acweb
    • Get a count for the payment table:
    SELECT COUNT(*) FROM sales.payment;
  2. Challenge

    Perform a Backup

    • Exit psql:
    • Download a script to create our access log table in the dev database:
    • Use psql to execute the script:
      psql -f accessLog.sql acweb
    • Make a directory for our backups:
      mkdir backups
    • Back up the dev version of the database that includes our new table:
      pg_dump -F t acweb > backups/acwebdev.tar
  3. Challenge

    Schedule a Backup

    • Download this backup script:
    • Make the script executable:
      chmod +x
    • Test the script by executing it:
    • Check for a backup file:
      ls backups
    • Edit crontab:
      crontab -e
    • Add the following entry (after pressing i to insert):
      0 1 * * * /var/lib/pgsql/
    • Save and exit:
    • Verify the entry:
      crontab -l

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