- What's New
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User Guide
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UCS Clusters
- Overview
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On-Premises Clusters
- Overview
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Cluster Federation
- Overview
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Workloads
- Workload Creation
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Container Settings
- Setting Basic Container Information
- Setting Container Specifications
- Setting Container Lifecycle Parameters
- Setting Health Check for a Container
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- Configuring a Scheduling Policy (Affinity/Anti-affinity)
- Configuring Scheduling and Differentiation
- Managing a Workload
- ConfigMaps and Secrets
- Services and Ingresses
- MCI
- MCS
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- Adding Labels and Taints to a Cluster
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Policy Center
- Overview
- Basic Concepts
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- Example: Using Policy Center for Kubernetes Resource Compliance Governance
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Policy Definition Library
- Overview
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UCS Clusters
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API Reference
- Before You Start
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API
- UCS Cluster
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Fleet
- Adding a Cluster to a Fleet
- Removing a Cluster from a Fleet
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- Updating the Zone Associated with the Federation of a Fleet
- Obtaining the Fleet List
- Enabling Fleet Federation
- Disabling Cluster Federation
- Querying Federation Enabling Progress
- Creating a Federation Connection and Downloading kubeconfig
- Creating a Federation Connection
- Downloading Federation kubeconfig
- Permissions Management
- Using the Karmada API
- Appendix
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FAQs
- About UCS
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Billing
- How Is UCS Billed?
- What Status of a Cluster Will Incur UCS Charges?
- Why Am I Still Being Billed After I Purchase a Resource Package?
- How Do I Change the Billing Mode of a Cluster from Pay-per-Use to Yearly/Monthly?
- What Types of Invoices Are There?
- Can I Unsubscribe from or Modify a Resource Package?
-
Permissions
- How Do I Configure Access Permissions for Each Function of the UCS Console?
- What Can I Do If an IAM User Cannot Obtain Cluster or Fleet Information After Logging In to UCS?
- How Do I Restore ucs_admin_trust I Deleted or Modified?
- What Can I Do If I Cannot Associate the Permission Policy with a Fleet or Cluster?
- How Do I Clear RBAC Resources After a Cluster Is Unregistered?
- Policy Center
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Fleets
- What Can I Do If Cluster Federation Verification Fails to Be Enabled for a Fleet?
- What Can I Do If an Abnormal, Federated Cluster Fails to Be Removed from the Fleet?
- What Can I Do If an Nginx Ingress Is in the Unready State After Being Deployed?
- What Can I Do If "Error from server (Forbidden)" Is Displayed When I Run the kubectl Command?
- Huawei Cloud Clusters
- Attached Clusters
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On-Premises Clusters
- What Can I Do If an On-Premises Cluster Fails to Be Connected?
- How Do I Manually Clear Nodes of an On-Premises Cluster?
- How Do I Downgrade a cgroup?
- What Can I Do If the VM SSH Connection Times Out?
- How Do I Expand the Disk Capacity of the CIA Add-on in an On-Premises Cluster?
- What Can I Do If the Cluster Console Is Unavailable After the Master Node Is Shut Down?
- What Can I Do If a Node Is Not Ready After Its Scale-Out?
- How Do I Update the CA/TLS Certificate of an On-Premises Cluster?
- What Can I Do If an On-Premises Cluster Fails to Be Installed?
- Multi-Cloud Clusters
-
Cluster Federation
- What Can I Do If the Pre-upgrade Check of the Cluster Federation Fails?
- What Can I Do If a Cluster Fails to Be Added to a Federation?
- What Can I Do If Status Verification Fails When Clusters Are Added to a Federation?
- What Can I Do If an HPA Created on the Cluster Federation Management Plane Fails to Be Distributed to Member Clusters?
- What Can I Do If an MCI Object Fails to Be Created?
- What Can I Do If I Fail to Access a Service Through MCI?
- What Can I Do If an MCS Object Fails to Be Created?
- What Can I Do If an MCS or MCI Instance Fails to Be Deleted?
- Traffic Distribution
- Container Intelligent Analysis
- General Reference
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metrics-server
From version 1.8 onwards, Kubernetes provides resource usage metrics, such as the container CPU and memory usage, through the Metrics API. These metrics can be directly accessed by users (for example, by running kubectl top) or used by controllers (for example, Horizontal Pod Autoscaler) in a cluster for decision-making. Metrics Server fetches these metrics.
Metrics Server is a cluster-wide aggregator of resource usage data. It is used as the metrics-server add-on on UCS. You can quickly install this add-on on the cluster console.
After metrics-server is installed, you can create an HPA policy on the Workload Scaling page. For details, see Workload Auto Scaling (HPA).
Official community projects: https://github.com/kubernetes-sigs/metrics-server
Constraints
metrics-server can be installed only in on-premises clusters.
Installing the Add-on
- Log in to the UCS console and access the cluster console.
- If the cluster is not added to any fleet, click the cluster name.
- If the cluster has been added to a fleet, click the fleet name. In the navigation pane, choose Clusters > Container Clusters.
- In the navigation pane, choose Add-ons. Locate metrics-server in Add-ons Available and click Install.
- Set Add-on Specifications to Standalone, HA, or Custom and click Install.
NOTE:
- In the on-premises cluster, the maximum number of metrics-server instances depends on the number of manage nodes. If you want to create more metrics-server instances using custom specifications, expand the number of manage nodes first.
- The manage nodes are managed using labels and taints in the on-premises cluster. To expand the number of the manage nodes, you only need to add labels and taints to non-manage nodes in the cluster. The procedure is as follows:
- Log in to the UCS console and access the cluster console. In the navigation pane, choose Nodes.
- Select the non-manage node and click Manage Labels and Taints.
- Click Add Operation to add an update content: Add/Update > Kubernetes Label > cop.manage > manage.
- Click Add Operation to add an update content: Add/Update > Taint > role > manage > NoSchedule.
- Click OK.
- Click the name of metrics-server in the installed add-on list to view the deployment status of the add-on instance in the cluster.
Upgrading the Add-on
- Log in to the UCS console and access the cluster console. In the navigation pane, choose Add-ons.
- In the installed add-on list, if there is "New version available" next to the version label of metrics-server, click Upgrade.
NOTE:
- If the button is unavailable, the add-on is already up-to-date and no upgrade is required.
- During the upgrade, metrics-server of the old version will be discarded, and metrics-server of the latest version will be installed.
- Configure the parameters as prompted and click OK.
Modifying the Add-on
- Log in to the UCS console and access the cluster console. In the navigation pane, choose Add-ons.
- Locate metrics-server in the installed add-ons and click Edit.
- Configure the parameters as prompted and click OK.
Uninstalling the Add-on
- Log in to the UCS console and access the cluster console. In the navigation pane, choose Add-ons.
- Locate metrics-server in the installed add-ons and click Uninstall.
- In the displayed dialog box, click Yes.
NOTE:
After metrics-server is uninstalled, you need to install another add-on that provides the Metrics API. If no add-on is installed, existing workload scaling policies will become unavailable.
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