CCE Container Storage (Everest)

Introduction

Everest is a cloud native container storage add-on that enables Kubernetes clusters to access cloud storage services through CSI.

In clusters of v1.27.5-r0, v1.28.3-r0, and later versions, this add-on is automatically configured by the system and does not need to be manually installed or updated.

Editing the Add-on

This add-on is installed by default. To modify its settings, perform the following steps:

1. Log in to the CCE console and click the cluster name to access the cluster console. In the navigation pane on the left, choose Add-ons. Locate CCE Container Storage (Everest) on the right and click Edit.
2. On the Edit Add-on page, modify the specifications.

   Table 1 Everest specifications

   Parameter	Description
   Instances	Number of pods for the add-on. High availability is not possible if there is only one pod. If an error occurs on the node where the pod runs, the add-on will fail.
   Containers	CPU and memory quotas of the containers for running the add-on. The add-on contains the everest-csi-controller and everest-csi-driver components. For details, see Components.

3. Modify the parameters.

   Table 2 Everest parameters

   Parameter	Description
   csi_attacher_worker_threads	Number of worker nodes that can be concurrently processed by Everest for attaching EVS volumes. The default value is 60.
   csi_attacher_detach_worker_threads	Number of worker nodes that can be concurrently processed by Everest for detaching EVS volumes. The default value is 60.
   volume_attaching_flow_ctrl	Maximum number of EVS volumes that can be attached by the Everest add-on within 1 minute. The default value is 0, indicating that the performance of attaching EVS volumes is determined by the underlying storage resources.
   cluster_id	Cluster ID
   default_vpc_id	ID of the VPC to which the cluster belongs
   disable_auto_mount_secret	Whether the default AK/SK can be used when an object bucket or parallel file system is mounted. The default value is false.
   enable_node_attacher	Whether to enable the attacher on the agent to process the VolumeAttachment.
   flow_control	This field is left blank by default. You do not need to configure this parameter.
   over_subscription	Overcommitment ratio of the local storage pool (local_storage). The default value is 80. If the size of the local storage pool is 100 GiB, it can be overcommitted to 180 GiB.
   project_id	ID of the project to which a cluster belongs

   

   The performance of attaching a large number of EVS volumes has been optimized. The following parameters can be configured:

   • csi_attacher_worker_threads
   • csi_attacher_detach_worker_threads
   • volume_attaching_flow_ctrl

   The preceding parameters are associated with each other and are constrained by the underlying storage resources in the region where the cluster is located. To attach a large number of volumes (more than 500 EVS volumes per minute), contact customer service and configure the parameters under their guidance to prevent the Everest add-on from running abnormally due to improper parameter settings.

4. Click Install.

Components