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Stash 0.9.0+ supports extending its functionality through addons. This guide will give you an overview of what is an addon, how addons work and a list of Stash addons.
Stash 0.9.0+ uses two different models for backup/restore based on target types. One of them is sidecar model where Stash injects a
init-container into the targeted workload for backup/restore. Another is job model where backup or restore is done via an external job.
The job model is further divided into two categories. In the first category, the targeted resource is well known to Stash (example, a PVC). Hence, the Stash operator itself can create the required job to backup/restore the target. In the second category, Stash follows
Function-Task model where the targeted resource is not known to Stash. In this case, the user creates some Function which resembles a step of backup/restore process and a Task which specifies the order of execution of these steps. Stash uses these
Task to generate the required job definition to backup/restore the target.
Function-Task model enables Stash to backup/restore the resources that the operator itself is not aware of. Users can extend Stash by creating respective
Task, and docker images for respective
Function to backup their desired resources.
When a user installs a Stash addon, it creates some
Task definitions. Then, when he creates a
RestoreSession object to backup/restore his desired resource, Stash operator resolves the
Task to create a Job to backup/restore the target. The following diagram shows how addons works in Stash:
Function is fundamentally a container specification and
Task specifies the execution order of the containers. Stash operator injects all the containers except last one resolved from the
Function specified in
init-container into the job in the same order they appear in the
Task. Then, it injects the last container as the main container of the Job.
The following addons are available for Stash:
|PostgreSQL||Backup & Restore PostgreSQL databases|
|Elasticsearch||Backup & Restore Elasticsearch databases|
|MySQL||Backup & Restore MySQL databases|
|MongoDB||Backup & Restore MongoDB databases|
|Percona XtraDB||Backup & Restore Percona XtraDB databases|