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- Linux Kernel Integer Overflow Vulnerability (CVE-2022-0185)
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Cluster Versions
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Clusters
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Cluster Overview
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Kubernetes Version Release Notes
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- Buying a Cluster
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Managing a Cluster
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Upgrading a Cluster
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- Before You Start
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Troubleshooting for Pre-upgrade Check Exceptions
- Pre-upgrade Check
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Cluster Overview
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Nodes
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Management Nodes
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Node O&M
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- Differences in kubelet and Runtime Component Configurations Between CCE and the Native Community
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Workloads
- Overview
- Creating a Workload
-
Configuring a Workload
- Configuring Time Zone Synchronization
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- Logging In to a Container
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Network
- Overview
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Container Network
- Overview
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Cloud Native Network 2.0 Settings
- Cloud Native 2.0 Network Model
- Configuring Pod Subnets of a Cluster
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Service
- Overview
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LoadBalancer
- Creating a LoadBalancer Service
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- Headless Services
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Ingresses
- Overview
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LoadBalancer Ingresses
- Creating a LoadBalancer Ingress on the Console
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-
Advanced Setting Examples of LoadBalancer Ingresses
- Configuring an HTTPS Certificate for a LoadBalancer Ingress
- Configuring SNI for a LoadBalancer Ingress
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- Nginx Ingresses
- DNS
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Old Console
- What Is Cloud Container Engine?
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- Clusters
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Nodes
- Overview
- Buying a Node
- Accepting ECSs as Nodes into a Cluster
- Removing a Node
- Logging In to a Node
- Managing Node Labels
- Synchronizing Node Data
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- Resetting a Node
- Deleting a Node
- Stopping a Node
- Performing Rolling Upgrade for Nodes
- Formula for Calculating the Reserved Resources of a Node
- Creating a Linux LVM Disk Partition for Docker
- Data Disk Space Allocation
- Adding a Second Data Disk to a Node in a CCE Cluster
- Node Pools
-
Workloads
- Overview
- Creating a Deployment
- Creating a StatefulSet
- Creating a DaemonSet
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- Managing Workloads and Jobs
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-
Configuring a Container
- Using a Third-Party Image
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- Setting Health Check for a Container
- Setting an Environment Variable
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- Add-ons
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- Cloud Trace Service (CTS)
-
Best Practices
- Checklist for Deploying Containerized Applications in the Cloud
- Containerization
- Migration
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Security
- Configuration Suggestions on CCE Cluster Security
- Configuration Suggestions on CCE Node Security
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API Reference
- Before You Start
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APIs
- API URL
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Cluster Management
- Creating a Cluster
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- Configuring Cluster Logs
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- Creating a Partition
- Obtaining Partition Details
- Updating a Partition
- Node Management
- Node Pool Management
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- Add-on Management
-
Cluster Upgrade
- Upgrading a Cluster
- Obtaining Cluster Upgrade Task Details
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- Continuing to Execute a Cluster Upgrade Task (Deprecated)
- Obtaining a List of Cluster Upgrade Task Details
- Pre-upgrade Check
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- Obtaining a List of Pre-upgrade Check Tasks of a Cluster
- Post-upgrade Check
- Cluster Backup
- Obtaining a List of Cluster Backup Task Details
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- Obtaining the Configuration of Cluster Upgrade Feature Gates
- Enabling the Cluster Upgrade Process Booting Task
- Obtaining a List of Upgrade Workflows
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Chart Management
- Uploading a Chart
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- Updating a Release
- Obtaining a Chart
- Deleting a Release
- Downloading a Chart
- Obtaining a Release
- Obtaining Chart Values
- Obtaining Historical Records of a Release
- Obtaining the Quota of a User Chart
- Kubernetes APIs
- Permissions and Supported Actions
-
Appendix
- Status Code
- Error Codes
- Obtaining a Project ID
- Obtaining an Account ID
- Specifying Add-ons to Be Installed During Cluster Creation
- How to Obtain Parameters in the API URI
- Creating a VPC and Subnet
- Creating a Key Pair
- Node Flavor Description
- Adding a Salt in the password Field When Creating a Node
- Maximum Number of Pods That Can Be Created on a Node
- Node OS
- Data Disk Space Allocation
- Attaching Disks to a Node
- SDK Reference
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FAQs
- Common FAQ
- Billing
- Cluster
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Node
- Node Creation
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Node Running
- What Should I Do If a Cluster Is Available But Some Nodes Are Unavailable?
- How Do I Log In to a Node Using a Password and Reset the Password?
- How Do I Collect Logs of Nodes in a CCE Cluster?
- What Should I Do If the vdb Disk of a Node Is Damaged and the Node Cannot Be Recovered After Reset?
- What Should I Do If I/O Suspension Occasionally Occurs When SCSI EVS Disks Are Used?
- How Do I Fix an Abnormal Container or Node Due to No Thin Pool Disk Space?
- How Do I Rectify Failures When the NVIDIA Driver Is Used to Start Containers on GPU Nodes?
- Specification Change
- OSs
- Node Pool
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Workload
-
Workload Exception Troubleshooting
- How Can I Find the Fault for an Abnormal Workload?
- What Should I Do If Pod Scheduling Fails?
- What Should I Do If a Pod Fails to Pull the Image?
- What Should I Do If Container Startup Fails?
- What Should I Do If a Pod Fails to Be Evicted?
- What Should I Do If a Storage Volume Cannot Be Mounted or the Mounting Times Out?
- What Should I Do If a Workload Remains in the Creating State?
- What Should I Do If a Pod Remains in the Terminating State?
- What Should I Do If a Workload Is Stopped Caused by Pod Deletion?
- What Should I Do If an Error Occurs When I Deploy a Service on the GPU Node?
- How Can I Locate Faults Using an Exit Code?
- Container Configuration
- Scheduling Policies
-
Others
- What Should I Do If a Cron Job Cannot Be Restarted After Being Stopped for a Period of Time?
- What Is a Headless Service When I Create a StatefulSet?
- What Should I Do If Error Message "Auth is empty" Is Displayed When a Private Image Is Pulled?
- What Is the Image Pull Policy for Containers in a CCE Cluster?
- What Can I Do If a Layer Is Missing During Image Pull?
-
Workload Exception Troubleshooting
-
Networking
-
Network Exception Troubleshooting
- How Do I Locate a Workload Networking Fault?
- Why Does the Browser Return Error Code 404 When I Access a Deployed Application?
- What Should I Do If a Container Fails to Access the Internet?
- What Should I Do If a Node Fails to Connect to the Internet (Public Network)?
- What Should I Do If Nginx Ingress Access in the Cluster Is Abnormal After the NGINX Ingress Controller Add-on Is Upgraded?
- What Could Cause Access Exceptions After Configuring an HTTPS Certificate for a LoadBalancer Ingress?
- Network Planning
- Security Hardening
-
Network Configuration
- How Can Container IP Addresses Survive a Container Restart?
- How Can I Check Whether an ENI Is Used by a Cluster?
- How Can I Delete a Security Group Rule Associated with a Deleted Subnet?
- How Can I Synchronize Certificates When Multiple Ingresses in Different Namespaces Share a Listener?
- How Can I Determine Which Ingress the Listener Settings Have Been Applied To?
-
Network Exception Troubleshooting
-
Storage
- How Do I Expand the Storage Capacity of a Container?
- What Are the Differences Among CCE Storage Classes in Terms of Persistent Storage and Multi-Node Mounting?
- Can I Create a CCE Node Without Adding a Data Disk to the Node?
- What Should I Do If the Host Cannot Be Found When Files Need to Be Uploaded to OBS During the Access to the CCE Service from a Public Network?
- How Can I Achieve Compatibility Between ExtendPathMode and Kubernetes client-go?
- Can CCE PVCs Detect Underlying Storage Faults?
- What Should I Do If a Yearly/Monthly EVS Disk Cannot Be Automatically Created?
- Namespace
-
Chart and Add-on
- What Should I Do If Installation of an Add-on Fails and "The release name is already exist" Is Displayed?
- How Do I Configure the Add-on Resource Quotas Based on Cluster Scale?
- How Can I Clean Up Residual Resources After the NGINX Ingress Controller Add-on in the Unknown State Is Deleted?
- Why TLS v1.0 and v1.1 Cannot Be Used After the NGINX Ingress Controller Add-on Is Upgraded?
-
API & kubectl FAQs
- How Can I Access a Cluster API Server?
- Can the Resources Created Using APIs or kubectl Be Displayed on the CCE Console?
- How Do I Download kubeconfig for Connecting to a Cluster Using kubectl?
- How Do I Rectify the Error Reported When Running the kubectl top node Command?
- Why Is "Error from server (Forbidden)" Displayed When I Use kubectl?
- DNS FAQs
- Image Repository FAQs
- Permissions
- Videos
Node Pool Overview
Introduction
CCE introduces node pools to help you better manage nodes in Kubernetes clusters. A node pool contains one node or a group of nodes with identical configuration in a cluster.
You can create custom node pools on the CCE console. With node pools, you can quickly create, manage, and destroy nodes without affecting the cluster. All nodes in a custom node pool have identical parameters and node type. You cannot configure a single node in a node pool; any configuration changes affect all nodes in the node pool.
You can also use node pools for auto scaling.
- When a pod in a cluster cannot be scheduled due to insufficient resources, scale-out can be automatically triggered.
- When there is an idle node or a monitoring metric threshold is met, scale-in can be automatically triggered.
This section describes how node pools work in CCE and how to create and manage node pools.
Node Pool Architecture
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Generally, all nodes in a node pool have the following same attributes:
- Node OS
- Startup parameters of Kubernetes components on a node
- User-defined startup script of a node
- K8S Labels and Taints
CCE provides the following extended attributes for node pools:
- Node pool OS
- Maximum number of pods on each node in a node pool
Description of DefaultPool
DefaultPool is not a real node pool. It only classifies nodes that are not in any node pool. These nodes are directly created on the console or by calling APIs. DefaultPool does not support any node pool functions, including scaling and parameter configuration. DefaultPool cannot be edited, deleted, expanded, or auto scaled, and nodes in it cannot be migrated.
Applicable Scenarios
When a large-scale cluster is required, you are advised to use node pools to manage nodes.
The following table describes multiple scenarios of large-scale cluster management and the functions of node pools in each scenario.
Scenario |
Function |
---|---|
Multiple heterogeneous nodes (with different models and configurations) in the cluster |
Nodes can be grouped into different pools for management. |
Frequent node scaling required in a cluster |
Node pools support auto scaling to dynamically add or reduce nodes. |
Complex application scheduling rules in a cluster |
Node pool tags can be used to quickly specify service scheduling rules. |
Functions and Precautions
Function |
Description |
Notes |
---|---|---|
Creating a node pool |
Add a node pool. |
It is recommended that a cluster contain no more than 100 node pools. |
Deleting a node pool |
Deleting a node pool will delete nodes in the pool. Pods on these nodes will be automatically migrated to available nodes in other node pools. |
If pods in the node pool have a specific node selector and none of the other nodes in the cluster satisfies the node selector, the pods will become unschedulable. |
Enabling auto scaling for a node pool |
After auto scaling is enabled, nodes will be automatically created or deleted in the node pool based on the cluster loads. |
You are advised not to store important data on nodes in a node pool because after auto scaling, data cannot be restored as nodes may be deleted. |
Enabling auto scaling for a node pool |
After auto scaling is disabled, the number of nodes in a node pool will not automatically change with the cluster loads. |
/ |
Adjusting the size of a node pool |
The number of nodes in a node pool can be directly adjusted. If the number of nodes is reduced, nodes are randomly removed from the current node pool. |
After auto scaling is enabled, you are not advised to manually adjust the node pool size. |
Changing node pool configurations |
You can modify the node pool name, node quantity, Kubernetes labels, taints, and resource tags. |
The modified Kubernetes labels and taints will apply to all nodes in the node pool, which may cause pod re-scheduling. Therefore, exercise caution when performing this operation. |
Adding an existing node to a node pool |
Nodes that do not belong to the cluster can be added to a node pool. The following requirements must be met:
|
Unless required, you are not advised to add existing nodes. You are advised to create a node pool. |
Removing a node from a node pool |
Nodes in a node pool can be migrated to the default node pool of the same cluster. |
Nodes in the default node pool cannot be migrated to other node pools, and nodes in a user-created node pool cannot be migrated to other user-created node pools. |
Cloning a node pool |
You can copy the configuration of an existing node pool to create a new node pool. |
/ |
Setting Kubernetes parameters |
You can configure core components with fine granularity. |
|
Deploying a Workload in a Specified Node Pool
When creating a workload, you can constrain pods to run in a specified node pool.
For example, on the CCE console, you can set the affinity between the workload and the node on the Scheduling Policies tab page on the workload details page to forcibly deploy the workload to a specific node pool. In this way, the workload runs only on nodes in the node pool. If you need to better control where the workload is to be scheduled, you can use affinity or anti-affinity policies between workloads and nodes described in Scheduling Policy Overview.
For example, you can use container's resource request as a nodeSelector so that workloads will run only on the nodes that meet the resource request.
If the workload definition file defines a container that requires four CPUs, the scheduler will not choose the nodes with two CPUs to run workloads.
Related Operations
You can log in to the CCE console and refer to the following sections to perform operations on node pools:
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