rubackup - ruby based backup program for Linux

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Modules

Modules

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Overview

Rubackup is based on a modular design. Hence many features can be added or modified in quite isolated modules which do not impact the rest of the application. Four modules types have been created, but only the first type is mandatory as all backup entries need to create a primary backup, but not all backups need to be encrypted or sent to a remote location. Each backup entry must use a backup module but they do not have to use the encrypt or remote ones. The notify module can be used globally in order to send notification at the end of the run.

‘backup’ modules

Implement the creation and management of a specific type of backup. For example there is a module which provides support for creating MySQL dumps. Another one for creating a compressed tar archives. These modules have to provide the functions to create the backup, list all existing backups of this types, and delete old versions of these backups. We can differentiate two type of such modules. There are modules which create a backup on the local disk. They are very common and can reuse the functions of the parent class for listing and deleting backups, as the code is identical in general. There are other types of backup modules which may not produce backup which are not stored as local files. For example the module for EBS Snapshot produces snapshots which are objects in AWS. These types of modules must provide a specific implementation of all functions including the functions to list and delete previous backups as the implementation in the base class is not appropriate.

Here is the list of all currently supported ‘backup’ modules:

• ModuleBackupBlockCopy: creates a compressed low-level copy of a block device (snapshots can be created for LVM Volumes)
• ModuleBackupEbsSnap: creates a snapshot of the EBS Volumes attached to the current EC2 instance in AWS
• ModuleBackupFsarchiver: creates a backup of filesystems using fsarchiver (snapshots can be created for LVM Volumes)
• ModuleBackupMysqldp: creates a compressed logical database dump using mysqldump for MySQL/MariaDB
• ModuleBackupPgsqldp: creates a logical database dump using mysqldump for PostgreSQL
• ModuleBackupRsyncGet: uses rsync over ssh to pull backups from a remote location (must match the same naming convention)
• ModuleBackupTarball: creates a compressed tar archive of files and directories

‘encrypt’ modules

Implement the support for encrypting local backups. A single function needs to be implemented for that sort of modules.

Here is the list of all currently supported ‘encrypt’ modules:

• ModuleEncryptGnupg: Encrypts local backups previously created using GnuPG

‘remote’ modules

This modules allow users to copy backups from the local disk to a remote location such as an S3 bucket in AWS or an FTP server. These modules can be used to have a second copy of all backups in a remote site. These modules must provide functions to implement the upload of a local file to the remote storage, and function to list and delete remote backups.

Here is the list of all currently supported ‘remote’ modules:

• ModuleRemoteAwsS3: Uploads and manages local backups previously created to the object storage service in AWS.

‘notify’ modules

These modules implement a single function which sends a notification message. This is used to let the administrator know the status of each run.

Here is the list of all currently supported ‘notify’ modules:

• ModuleNotifyAwsSes: Sends a notification using the Simple Email Service provided by AWS

Parameters

All backup entries have many options in common in their configuration. But as each module does different things, they all need different parameters in the configuration. That is why the backup entries provide secondary level parameters as these parameters are used by a particular module. For example if you use backup_type: ModuleBackupTarball then you will have to provide options used by this module in backup_opts such as the list of files and directory to include and to exclude in the archive, and the type of compression to use. Regarding the optional modules (for encryption and remote backups) you must provide encrypt_type and/or remote_type only if you want to use these modules. In this case you also have to provide the module specific options in encrypt_opts and/or remote_opts in the backup entry configuration.