Install the kubernetes-cronhpa-controller plugin¶

The container copy timing horizontal expansion and contraction policy (CronHPA) can provide stable computing resource guarantee for periodic high-concurrency applications, and kubernetes-cronhpa-controller is a key component to implement CronHPA.

This section describes how to install the kubernetes-cronhpa-controller plugin.

Prerequisites¶

Before installing the kubernetes-cronhpa-controller plugin, the following prerequisites need to be met:

• In the Container Management module Access Kubernetes Cluster or Create Kubernetes Cluster, and can access the cluster UI interface.

• Create a namespace.

• The current operating user should have NS Edit or higher permissions, for details, please refer to Namespace Authorization.

Steps¶

Refer to the following steps to install the kubernetes-cronhpa-controller plugin for the cluster.

1. On the Cluster List page, find the target cluster where the plugin needs to be installed, click the name of the cluster, then click Workload -> Stateless Workload on the left, and click the name of the target workload.

2. On the workload details page, click the Auto Scaling tab, and click Install on the right side of CronHPA.

3. Read the relevant introduction of the plug-in, select the version and click the Install button. It is recommended to install 1.3.0 or later.

4. Refer to the following instructions to configure the parameters.

   • Name: Enter the plugin name, please note that the name can be up to 63 characters, can only contain lowercase letters, numbers, and separators ("-"), and must start and end with lowercase letters or numbers, such as kubernetes-cronhpa-controller.
   • Namespace: Select which namespace the plugin will be installed in, here we take default as an example.
   • Version: The version of the plugin, here we take the 1.3.0 version as an example.
   • Ready Wait: When enabled, it will wait for all associated resources under the application to be in the ready state before marking the application installation as successful.
   • Failed to delete: If the plugin installation fails, delete the associated resources that have already been installed. When enabled, ready wait will be enabled synchronously by default.
   • Detailed log: When enabled, a detailed log of the installation process will be recorded.

   Note

   After enabling ready wait and/or failed deletion, it takes a long time for the application to be marked as "running".

5. Click OK in the lower right corner of the page, and the system will automatically jump to the Helm application list page. Wait a few minutes and refresh the page to see the application you just installed.

   Warning

   If you need to delete the kubernetes-cronhpa-controller plugin, you should go to the Helm Applications list page to delete it completely.

   If you delete the plug-in under the Auto Scaling tab of the workload, this only deletes the workload copy of the plug-in, and the plug-in itself is still not deleted, and an error will be prompted when the plug-in is reinstalled later.

6. Go back to the Auto Scaling tab under the workload details page, and you can see that the interface displays Plug-in installed. Now it's time to start creating CronHPA policies.

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