Understand PX-Backup


PX-Backup is a Kubernetes backup solution that allows you to back up and restore applications and their data across multiple clusters. PX-Backup works with PX-Central, allowing you or any other approved users to manage multiple clusters and their backups from a single UI. Under this principle of multi-tenancy, authorized users connect through OIDC to create and manage backups for clusters and applications which they have permissions without needing to go through an administrator.

PX-Backup architecture

PX-Backup Architecture

PX-Backup is compatible with any Kubernetes cluster, including managed and cloud deployments, and does not require Portworx Enterprise to be installed. PX-Backup integrates with the following major block storage providers:

  • Amazon EBS
  • Google Persistent Disk
  • Azure Managed Disks
  • Portworx PX-Store

PX-Backup is capable of backing up the following Kubernetes resources:

  • Persistent Volume (PV)
  • Persistent Volume Claim (PVC)
  • Deployment
  • StatefulSet
  • ConfigMap
  • Service
  • Secret
  • DaemonSet
  • ServiceAccount
  • Role
  • RoleBinding
  • ClusterRole
  • ClusterRoleBinding
  • Ingress

Understand how PX-Backup works

PX-Backup provides namespace and label selectors, allowing you to create granular backups of the application you want. You can backup an entire namespace, or you can use label selectors to select only certain resources to backup. This selection method also helps preserve associated configuration and pod data, ensuring that your backups work properly once restored. For example, PX-backup can back up a MySQL deployment containing pods, PVCs, and volumes tagged with an app = mysql label. Given this system, PX-Backup can backup stateful applications as easily as stateless ones.

You can schedule backups by creating an independent schedule policy that defines when backups run and how many rolling copies they keep, and you can associate this schedule policy with as many backups as you want.

Avoid manual prep-work and minimize interruptions to your cluster associated with backup tasks by creating rules that run before and after backups are taken. As with schedule policies, you can associate rules with multiple backups.

PX-Backup components

In order to use PX-Backup, it is helpful to understand the components within it. These components enable you to perform backup and restore operations:

PX-Backup server

This is a gRPC server that implements the basic CRUD operations for the following PX-Backup objects:

  • Cluster
  • Backup location
  • Cloud credential
  • Schedule policy
  • Backup
  • Restore
  • Backup schedule

Application clusters

A cluster in PX-Backup is any Kubernetes cluster that PX-Backup makes backups from or restores backups to. PX-Backup supports any Kubernetes cluster that is network accessible. With PX-Backup, you can monitor, backup, and restore across all of your Kubernetes clusters. Application clusters:

  • Lists all applications and resources available on the cluster, which you can choose to backup.
  • Creates or manages stork resources on the cluster. PX-Backup Server communicates with stork to create application-level backups by creating the BackupLocation and ApplicationBackups CRDs. Stork monitors these CRDs on each user’s cluster. PX-Backup Server also monitors the status of ApplicationBackups and ApplicationRestores on these clusters.

Datastore

Database where the PX-Backup stores objects related to the cluster such as backup location, schedule policies, backup, restore, and backup schedule. PX-Backup uses MongoDB as the datastore from the 2.0.0 version.

Token Based Authentication

PX-Backup Server communicates with an external service (Okta, KeyCloak, and so on) to validate and authorize tokens that are used for the API calls.

Backups

Backups in PX-Backup contain backup images and configuration data. You can attach schedule policies to run them at designated times and keep a designated amount of rolling backups, and attach rules to perform commands before or after a backup runs.

Backup locations

Backup locations are object stores you’ve added to PX-Backup. PX-Backup stores backups on any compatible object storage:

  • AWS S3 or compatible object stores
  • Azure Blob Storage
  • Google Cloud Storage

A backup location is not tied to any particular cluster, and can be used to trigger backups and restores on any cluster. Similar to clusters, an administrator or user can create a backup location. The PX-Backup server stores information about the create request in the Datastore.

Restores

Restore your backups to the original cluster or different clusters, replace applications on the original cluster or restore to a new namespace. Perform partial restores to selected namespaces from the backup.

Schedule Policies

Create schedule policies and attach them to backups to run them at designated times and keep a designated amount of rolling backups.

Rules

Use rules to create commands which run before or after a backup operation is performed.

Application view

You can interact with PX-Backup through a central application view. From here, you can see all of the resources currently on your cluster, filter them by namespace and labels, and create a backup.

Get Started

Perform the following tasks to get started with PX-Backup and perform your first backup:

  1. Install PX-Backup
  2. Add a cluster
  3. Configure backup locations
  4. Perform a backup

Last edited: Thursday, Sep 2, 2021