# everest (System Resource Add-on, Mandatory)

#### Introduction

Everest is a cloud-native container storage system. Based on Container Storage Interface (CSI), clusters of Kubernetes v1.15 or later can interconnect with cloud storage services such as EVS, OBS, SFS, and SFS Turbo.

everest is a system resource add-on. It is installed by default when a cluster of Kubernetes v1.15 or later is created.

#### Notes and Constraints

- If your cluster is upgraded from v1.13 to v1.15, storage-driver is replaced by everest (v1.1.6 or later) for container storage. The takeover does not affect the original storage functions. For details about CSI and FlexVolume, see Differences Between CSI and FlexVolume Plug-ins.
- In version 1.2.0 of the everest add-on, key authentication is optimized when OBS is used. After the everest add-on is upgraded from a version earlier than 1.2.0, you need to restart all workloads that use OBS in the cluster. Otherwise, workloads may not be able to use OBS.
- By default, this add-on is installed in clusters of v1.15 and later. For clusters of v1.13 and earlier, the storage-driver add-on is installed by default.

#### Installing the Add-on

This add-on has been installed by default. If it is uninstalled due to some reasons, you can reinstall it by performing the following steps:

1. Log in to the CCE console. In the navigation pane, choose Add-ons. On the Add-on Marketplace tab page, click Install Add-on under everest.
2. On the Install Add-on page, select the cluster and the add-on version, and click Next: Configuration.
3. Select Single or HA for Add-on Specifications, and click Install.

   After the add-on is installed, click Go Back to Previous Page. On the Add-on Instance tab page, select the corresponding cluster to view the running instance. This indicates that the add-on has been installed on each node in the cluster.

#### Upgrading the Add-on

1. Log in to the CCE console. In the navigation pane, choose Add-ons. On the Add-on Instance tab page, click Upgrade under everest.

   - If the Upgrade button is unavailable, the current add-on is already up-to-date and no upgrade is required.
   - When the upgrade is complete, the original everest version on cluster nodes will be replaced by the latest version.
2. On the Basic Information page, select the add-on version and click Next.
3. Select Single or HA for Add-on Specifications, and click Upgrade.

#### Uninstalling the Add-on

1. Log in to the CCE console. In the navigation pane, choose Add-ons. On the Add-on Instance tab page, click Uninstall under everest.
2. In the dialog box displayed, click Yes to uninstall the add-on.

Parent topic: Add-ons