--- title: How to backup your databases eleventyNavigation: key: 🗄️ Backup your databases parent: How-to guides order: 8 --- ## Database dump hooks If you want to backup a database, it's best practice with most database systems to backup an exported database dump, rather than backing up your database's internal file storage. That's because the internal storage can change while you're reading from it. In contrast, a database dump creates a consistent snapshot that is more suited for backups. Fortunately, borgmatic includes built-in support for creating database dumps prior to running backups. For example, here is everything you need to dump and backup a couple of local PostgreSQL databases and a MySQL/MariaDB database. ```yaml hooks: postgresql_databases: - name: users - name: orders mysql_databases: - name: posts ``` New in version 1.5.22 You can also dump MongoDB databases. For example: ```yaml hooks: mongodb_databases: - name: messages ``` New in version 1.7.9 Additionally, you can dump SQLite databases. For example: ```yaml hooks: sqlite_databases: - name: mydb path: /var/lib/sqlite3/mydb.sqlite ``` As part of each backup, borgmatic streams a database dump for each configured database directly to Borg, so it's included in the backup without consuming additional disk space. (The exceptions are the PostgreSQL/MongoDB "directory" dump formats, which can't stream and therefore do consume temporary disk space. Additionally, prior to borgmatic 1.5.3, all database dumps consumed temporary disk space.) To support this, borgmatic creates temporary named pipes in `~/.borgmatic` by default. To customize this path, set the `borgmatic_source_directory` option in the `location` section of borgmatic's configuration. Also note that using a database hook implicitly enables both the `read_special` and `one_file_system` configuration settings (even if they're disabled in your configuration) to support this dump and restore streaming. See Limitations below for more on this. Here's a more involved example that connects to remote databases: ```yaml hooks: postgresql_databases: - name: users hostname: database1.example.org - name: orders hostname: database2.example.org port: 5433 username: postgres password: trustsome1 format: tar options: "--role=someone" mysql_databases: - name: posts hostname: database3.example.org port: 3307 username: root password: trustsome1 options: "--skip-comments" mongodb_databases: - name: messages hostname: database4.example.org port: 27018 username: dbuser password: trustsome1 authentication_database: mongousers options: "--ssl" sqlite_databases: - name: mydb path: /var/lib/sqlite3/mydb.sqlite ``` See your [borgmatic configuration file](https://torsion.org/borgmatic/docs/reference/configuration/) for additional customization of the options passed to database commands (when listing databases, restoring databases, etc.). ### All databases If you want to dump all databases on a host, use `all` for the database name: ```yaml hooks: postgresql_databases: - name: all mysql_databases: - name: all mongodb_databases: - name: all ``` Note that you may need to use a `username` of the `postgres` superuser for this to work with PostgreSQL. The SQLite hook in particular does not consider "all" a special database name. New in version 1.7.6 With PostgreSQL and MySQL, you can optionally dump "all" databases to separate files instead of one combined dump file, allowing more convenient restores of individual databases. Enable this by specifying your desired database dump `format`: ```yaml hooks: postgresql_databases: - name: all format: custom mysql_databases: - name: all format: sql ``` ### Containers If your database is running within a container and borgmatic is too, no problem—configure borgmatic to connect to the container's name on its exposed port. For instance: ```yaml hooks: postgresql_databases: - name: users hostname: your-database-container-name port: 5433 username: postgres password: trustsome1 ``` But what if borgmatic is running on the host? You can still connect to a database container if its ports are properly exposed to the host. For instance, when running the database container, you can specify `--publish 127.0.0.1:5433:5432` so that it exposes the container's port 5432 to port 5433 on the host (only reachable on localhost, in this case). Or the same thing with Docker Compose: ```yaml services: your-database-container-name: image: postgres ports: - 127.0.0.1:5433:5432 ``` And then you can connect to the database from borgmatic running on the host: ```yaml hooks: postgresql_databases: - name: users hostname: 127.0.0.1 port: 5433 username: postgres password: trustsome1 ``` You can alter the ports in these examples to suit your particular database system. ### No source directories New in version 1.7.1 If you would like to backup databases only and not source directories, you can omit `source_directories` entirely. In older versions of borgmatic, instead specify an empty `source_directories` value, as it is a mandatory option prior to version 1.7.1: ```yaml location: source_directories: [] hooks: mysql_databases: - name: all ``` ### External passwords If you don't want to keep your database passwords in your borgmatic configuration file, you can instead pass them in via [environment variables](https://torsion.org/borgmatic/docs/how-to/provide-your-passwords/) or command-line [configuration overrides](https://torsion.org/borgmatic/docs/how-to/make-per-application-backups/#configuration-overrides). ### Configuration backups An important note about this database configuration: You'll need the configuration to be present in order for borgmatic to restore a database. So to prepare for this situation, it's a good idea to include borgmatic's own configuration files as part of your regular backups. That way, you can always bring back any missing configuration files in order to restore a database. ## Supported databases As of now, borgmatic supports PostgreSQL, MySQL/MariaDB, MongoDB, and SQLite databases directly. But see below about general-purpose preparation and cleanup hooks as a work-around with other database systems. Also, please [file a ticket](https://torsion.org/borgmatic/#issues) for additional database systems that you'd like supported. ## Database restoration To restore a database dump from an archive, use the `borgmatic restore` action. But the first step is to figure out which archive to restore from. A good way to do that is to use the `rlist` action: ```bash borgmatic rlist ``` (No borgmatic `rlist` action? Try `list` instead or upgrade borgmatic!) That should yield output looking something like: ```text host-2023-01-01T04:05:06.070809 Tue, 2023-01-01 04:05:06 [...] host-2023-01-02T04:06:07.080910 Wed, 2023-01-02 04:06:07 [...] ``` Assuming that you want to restore all database dumps from the archive with the most up-to-date files and therefore the latest timestamp, run a command like: ```bash borgmatic restore --archive host-2023-01-02T04:06:07.080910 ``` (No borgmatic `restore` action? Upgrade borgmatic!) With newer versions of borgmatic, you can simplify this to: ```bash borgmatic restore --archive latest ``` The `--archive` value is the name of the archive to restore from. This restores all databases dumps that borgmatic originally backed up to that archive. This is a destructive action! `borgmatic restore` replaces live databases by restoring dumps from the selected archive. So be very careful when and where you run it. ### Repository selection If you have a single repository in your borgmatic configuration file(s), no problem: the `restore` action figures out which repository to use. But if you have multiple repositories configured, then you'll need to specify the repository to use via the `--repository` flag. This can be done either with the repository's path or its label as configured in your borgmatic configuration file. ```bash borgmatic restore --repository repo.borg --archive host-2023-... ``` ### Restore particular databases If you've backed up multiple databases into an archive, and you'd only like to restore one of them, use the `--database` flag to select one or more databases. For instance: ```bash borgmatic restore --archive host-2023-... --database users ``` New in version 1.7.6 You can also restore individual databases even if you dumped them as "all"—as long as you dumped them into separate files via use of the "format" option. See above for more information. ### Restore all databases To restore all databases: ```bash borgmatic restore --archive host-2023-... --database all ``` Or omit the `--database` flag entirely: ```bash borgmatic restore --archive host-2023-... ``` Prior to borgmatic version 1.7.6, this restores a combined "all" database dump from the archive. New in version 1.7.6 Restoring "all" databases restores each database found in the selected archive. That includes any combined dump file named "all" and any other individual database dumps found in the archive. ### Restore particular schemas New in version 1.7.13 With PostgreSQL and MongoDB, you can limit the restore to a single schema found within the database dump: ```bash borgmatic restore --archive latest --database users --schema tentant1 ``` ### Limitations There are a few important limitations with borgmatic's current database restoration feature that you should know about: 1. You must restore as the same Unix user that created the archive containing the database dump. That's because the user's home directory path is encoded into the path of the database dump within the archive. 2. As mentioned above, borgmatic can only restore a database that's defined in borgmatic's own configuration file. So include your configuration file in backups to avoid getting caught without a way to restore a database. 3. borgmatic does not currently support backing up or restoring multiple databases that share the exact same name on different hosts. 4. Because database hooks implicitly enable the `read_special` configuration, any special files are excluded from backups (named pipes, block devices, character devices, and sockets) to prevent hanging. Try a command like `find /your/source/path -type b -or -type c -or -type p -or -type s` to find such files. Common directories to exclude are `/dev` and `/run`, but that may not be exhaustive. New in version 1.7.3 When database hooks are enabled, borgmatic automatically excludes special files (and symlinks to special files) that may cause Borg to hang, so generally you no longer need to manually exclude them. There are potential edge cases though in which applications on your system create new special files *after* borgmatic constructs its exclude list, resulting in Borg hangs. If that occurs, you can resort to the manual excludes described above. And to opt out of the auto-exclude feature entirely, explicitly set `read_special` to true. ### Manual restoration If you prefer to restore a database without the help of borgmatic, first [extract](https://torsion.org/borgmatic/docs/how-to/extract-a-backup/) an archive containing a database dump. borgmatic extracts the dump file into the *`username`*`/.borgmatic/` directory within the extraction destination path, where *`username`* is the user that created the backup. For example, if you created the backup with the `root` user and you're extracting to `/tmp`, then the dump will be in `/tmp/root/.borgmatic`. After extraction, you can manually restore the dump file using native database commands like `pg_restore`, `mysql`, `mongorestore`, `sqlite`, or similar. Also see the documentation on [listing database dumps](https://torsion.org/borgmatic/docs/how-to/inspect-your-backups/#listing-database-dumps). ## Preparation and cleanup hooks If this database integration is too limited for needs, borgmatic also supports general-purpose [preparation and cleanup hooks](https://torsion.org/borgmatic/docs/how-to/add-preparation-and-cleanup-steps-to-backups/). These hooks allows you to trigger arbitrary commands or scripts before and after backups. So if necessary, you can use these hooks to create database dumps with any database system. ## Troubleshooting ### PostgreSQL/MySQL authentication errors With PostgreSQL and MySQL/MariaDB, if you're getting authentication errors when borgmatic tries to connect to your database, a natural reaction is to increase your borgmatic verbosity with `--verbosity 2` and go looking in the logs. You'll notice though that your database password does not show up in the logs. This is likely not the cause of the authentication problem unless you mistyped your password, however; borgmatic passes your password to the database via an environment variable that does not appear in the logs. The cause of an authentication error is often on the database side—in the configuration of which users are allowed to connect and how they are authenticated. For instance, with PostgreSQL, check your [pg_hba.conf](https://www.postgresql.org/docs/current/auth-pg-hba-conf.html) file for that configuration. Additionally, MySQL/MariaDB may be picking up some of your credentials from a defaults file like `~/.my.cnf`. If that's the case, then it's possible MySQL/MariaDB ends up using, say, a username from borgmatic's configuration and a password from `~/.my.cnf`. This may result in authentication errors if this combination of credentials is not what you intend. ### MySQL table lock errors If you encounter table lock errors during a database dump with MySQL/MariaDB, you may need to [use a transaction](https://dev.mysql.com/doc/refman/8.0/en/mysqldump.html#option_mysqldump_single-transaction). You can add any additional flags to the `options:` in your database configuration. Here's an example: ```yaml hooks: mysql_databases: - name: posts options: "--single-transaction --quick" ``` ### borgmatic hangs during backup See Limitations above about `read_special`. You may need to exclude certain paths with named pipes, block devices, character devices, or sockets on which borgmatic is hanging. Alternatively, if excluding special files is too onerous, you can create two separate borgmatic configuration files—one for your source files and a separate one for backing up databases. That way, the database `read_special` option will not be active when backing up special files. New in version 1.7.3 See Limitations above about borgmatic's automatic exclusion of special files to prevent Borg hangs.