Database settings

The following databases are supported by this application:

  • SQLite

  • MySQL

  • PostgreSQL

  • MongoDB

  • And the ones you will implement

By default, DBBackup will try to use your database settings in DATABASES for handle database, but some databases require custom options so you could want to use different parameters for backup. That’s why we included a DBBACKUP_CONNECTORS setting; it acts like the DATABASES one:

DBBACKUP_CONNECTORS = {
    'default': {
        'USER': 'backupuser',
        'PASSWORD': 'backuppassword',
        'HOST': 'replica-for-backup'
    }
}

This configuration will allow you to use a replica with a different host and user, which is a great pratice if you don’t want to overload your main database.

DBBackup uses Connectors for creating and restoring backups; below you’ll see specific parameters for the built-in ones.

Common

All connectors have the following parameters:

CONNECTOR

Absolute path to a connector class by default is:

  • dbbackup.db.sqlite.SqliteConnector for 'django.db.backends.sqlite3'

  • dbbackup.db.mysql.MysqlDumpConnector for django.db.backends.mysql

  • dbbackup.db.postgresql.PgDumpConnector for django.db.backends.postgresql

  • dbbackup.db.postgresql.PgDumpGisConnector for django.contrib.gis.db.backends.postgis

  • dbbackup.db.mongodb.MongoDumpConnector for django_mongodb_engine

All supported built-in connectors are listed below.

EXCLUDE

Tables to exclude from backup as list. This option can be unavailable for connectors making snapshots.

EXTENSION

Extension of backup file name, default 'dump'.

Command connectors

Some connectors use command line tools as dump engine, mysqldump for example. These kinds of tools have common attributes:

DUMP_CMD

Path to the command used to create a backup; default is the appropriate command supposed to be in your PATH, for example: 'mysqldump' for MySQL.

This setting is useful only for connectors using command line tools (children of dbbackup.db.base.BaseCommandDBConnector)

RESTORE_CMD

Same as DUMP_CMD but for restoring action.

DUMP_PREFIX and RESTORE_PREFIX

String to include as prefix of dump or restore command. It will be add with a space between launched command and its prefix.

DUMP_SUFFIX and RESTORE_PREFIX

String to include as suffix of dump or restore command. It will be add with a space between launched command and its suffix.

ENV, DUMP_ENV and RESTORE_ENV

Environment variables used during command running, default are {}. ENV is used for every command, DUMP_ENV and RESTORE_ENV override the values defined in ENV during the dedicated commands.

USE_PARENT_ENV

Specify if the connector will use its parent’s environment variables. By default it is True to keep PATH.

SQLite

SQLite uses by default dbbackup.db.sqlite.SqliteConnector.

SqliteConnector

It is in pure Python and copys the behavior of .dump command for creating a SQL dump.

SqliteCPConnector

You can also use dbbackup.db.sqlite.SqliteCPConnector for making a simple raw copy of your database file, like a snapshot.

In-memory database aren’t dumpable with it.

MySQL

MySQL uses by default dbbackup.db.mysql.MysqlDumpConnector. It uses mysqldump and mysql for its job.

PostgreSQL

Postgres uses by default dbbackup.db.postgres.PgDumpConnector, but we advise you to use dbbackup.db.postgres.PgDumpBinaryConnector. The first one uses pg_dump and pqsl for its job, creating RAW SQL files.

The second uses pg_restore with binary dump files.

They can also use psql for launch administration command.

SINGLE_TRANSACTION

When doing a restore, wrap everything in a single transaction, so errors cause a rollback.

This corresponds to --single-transaction argument of psql and pg_restore.

Default: True

DROP

With PgDumpConnector, it includes tables dropping statements in dump file. PgDumpBinaryConnector drops at restoring.

This corresponds to --clean argument of pg_dump and pg_restore.

Default: True

PostGIS

Set in dbbackup.db.postgres.PgDumpGisConnector, it does the same as PostgreSQL but launchs CREATE EXTENSION IF NOT EXISTS postgis; before restore database.

PSQL_CMD

Path to psql command used for administration tasks like enable PostGIS for example, default is psql.

PASSWORD

If you fill this settings PGPASSWORD environment variable will be used with every commands. For security reason, we advise to use .pgpass file.

ADMIN_USER

Username used for launch action with privileges, extension creation for example.

ADMIN_PASSWORD

Password used for launch action with privileges, extension creation for example.

MongoDB

MongoDB uses by default dbbackup.db.mongodb.MongoDumpConnector. it uses mongodump and mongorestore for its job.

OBJECT_CHECK

Validate documents before inserting in database (option --objcheck in command line), default is True.

DROP

Replace objects that are already in database, (option --drop in command line), default is True.

Custom connector

Creating your connector is easy; create a children class from dbbackup.db.base.BaseDBConnector and create _create_dump and _restore_dump. If your connector uses a command line tool, inherit it from dbbackup.db.base.BaseCommandDBConnector

Connecting a Custom connector

Here is an example, on how to easily connect a custom connector that you have created or even that you simply want to reuse:

DBBACKUP_CONNECTOR_MAPPING = {
    'transaction_hooks.backends.postgis': 'dbbackup.db.postgresql.PgDumpGisConnector',
}

Obviously instead of dbbackup.db.postgresql.PgDumpGisConnector you can use the custom connector you have created yourself and transaction_hooks.backends.postgis is simply the database engine name you are using.