Accepting Nodes for Management

In CCE, you can create a node (Creating a Node) or add existing nodes (ECSs) to your cluster for management.

• ECSs can be managed.

The cloud servers to be managed must meet the following requirements:

• The node to be accepted must be in the Running state and not used by other clusters. In addition, the node to be accepted does not carry the CCE-Dynamic-Provisioning-Node tag.
• The node to be accepted and the cluster must be in the same VPC. (If the cluster version is earlier than v1.13.10, the node to be accepted and the CCE cluster must be in the same subnet.)
• Data disks must be attached to the nodes to be managed if the system components of these nodes are stored separately. These nodes can be attached with either a local disk (disk-intensive disk) or a data disk of at least 20 GiB. Additionally, any data disks already attached must not be smaller than 10 GiB.
• The node to be accepted must have at least 2 CPU cores, 4 GiB of memory, and only one network interface.
• Only cloud servers with the same data disk configuration can be accepted in batches for management.
• If IPv6 is enabled for a cluster, only nodes in a subnet with IPv6 enabled can be accepted and managed. If IPv6 is not enabled for the cluster, only nodes in a subnet without IPv6 enabled can be accepted.
• CCE Turbo clusters require that each node supports supplementary network interfaces, or you will need to bind at least 16 network interfaces. For details about the node flavors, see the options provided on the console when you create a node.
• Data disks that have been partitioned will be ignored during node management. Ensure that there is at least one unpartitioned data disk meeting the specifications attached to the node.

1. Log in to the CCE console and go to the cluster where the node to be accepted resides.
2. In the navigation pane, choose Nodes. On the displayed page, click the Nodes tab and then Accept Node in the upper right corner.
3. Specify node parameters.

   Node Configuration

   Table 1 Node configuration parameters

   Parameter	Description
   Node Pool	Default node pool: You can add nodes that meet the management requirements to the default node pool of the cluster. Custom node pool: You only need to select the nodes that meet the management requirements. These nodes will use the basic, network, and advanced settings of the custom node pool. You do not need to configure other parameters. For details, see Accepting Nodes in a Node Pool.
   Specifications	Click Select Cloud Server and select the servers to be accepted. You can select multiple cloud servers for batch management. However, only the cloud servers with the same specifications, AZ, and data disk configuration can be added in batches. If a cloud server contains multiple data disks, select one of them for the container runtime and kubelet.
   Container Runtime (Original Container Engine)	The container runtimes supported by CCE include Docker and containerd, which may vary depending on cluster types, cluster versions, and OSs. Select a container runtime based on the information displayed on the CCE console.
   OS	Select an OS type. Different types of nodes support different OSs. Public image: Select a public image for the node. Private image: Select a private image for the node. NOTE: Service container runtimes share the kernel and underlying calls of nodes. To ensure compatibility, select a Linux distribution version that is the same as or close to that of the final service container image for the node OS.
   Login Mode	Password The default username is root. Enter the password for logging in to the node and confirm the password. Be sure to remember the password as you will need it when you log in to the node. Key Pair Select the key pair used to log in to the node. You can select a shared key. A key pair is used for identity authentication when you remotely log in to a node. If no key pair is available, click Create Key Pair. Image password (supported for ECSs or PMs whose OSs are private images) Retain the password of the selected image. To use this option, ensure that you have set a password for the selected image.

   Storage Settings

   Configure storage resources on a node for the containers running on it.

   Table 2 Configuration parameters

   Parameter	Description
   System Disk	Directly use the system disk of the cloud server.
   System Component Storage	Select a disk for storing system components. Data Disk: added for storing container runtime and kubelet components by default. The disk size ranges from 20 GiB to 32768 GiB. The default value is 100 GiB. This data disk cannot be deleted or detached. Otherwise, the node will become unavailable. System Disk: stores CCE resources such as downloaded images, ephemeral storage for containers, and container stdout logs. If the system disk is fully occupied, it will negatively affect the stability of the node. NOTE: In clusters v1.23.18-r0, v1.25.13-r0, v1.27.10-r0, v1.28.8-r0, v1.29.4-r0, or later, you can select a disk for storing system components. If CCE Node Problem Detector is used, ensure that its version is 1.19.2 or later.
   Data Disk	At least one default data disk must be added for storing container runtime and kubelet components if System Component Storage is set to Data Disk. This data disk cannot be deleted or detached. Otherwise, the node will become unavailable. This function is available for clusters of a version earlier than v1.23.18-r0, v1.25.13-r0, v1.27.10-r0, v1.28.8-r0, or v1.29.4-r0. If System Component Storage is set to System Disk, you do not need to add a default data disk. In this case, all data disks are common ones: You can set the data disk size to a value ranging from 10 GiB to 32768 GiB. The default value is 100 GiB. This function is available for clusters v1.23.18-r0, v1.25.13-r0, v1.27.10-r0, v1.28.8-r0, v1.29.4-r0, or later versions. Click Expand to configure Data Disk Space Allocation. This allocates space for container runtimes, images, and ephemeral storage to ensure they are running normally. For details about how to allocate data disk space, see Space Allocation of a Data Disk. For other data disks, a raw disk is created without any processing by default. You can also click Expand and select Mount Disk to mount the data disk to a specified directory.

   Advanced Settings

   Table 3 Advanced configuration parameters

   Parameter	Description
   Resource Tag	You can add resource tags to classify resources. A maximum of eight resource tags can be added. You can create predefined tags on the TMS console. These tags are available to all resources that support tags. You can use these tags to improve the tag creation and resource migration efficiency. CCE will automatically create the CCE-Dynamic-Provisioning-Node=Node ID tag.
   Kubernetes Label	Click Add Label to set the key-value pair attached to the Kubernetes objects (such as pods). A maximum of 20 labels can be added. Labels can be used to distinguish nodes. With workload affinity settings, container pods can be scheduled to a specified node. For more information, see Labels and Selectors.
   Taint	This parameter is left blank by default. You can add taints to configure anti-affinity for the node. A maximum of 20 taints are allowed for each node. Each taint contains the following parameters: Taint key: A key must contain up to 63 characters, starting with a letter or digit. Only letters, digits, hyphens (-), underscores (_), and periods (.) are allowed. A DNS subdomain name can be used as the prefix of a key. Taint value: A value must contain up to 63 characters, starting with a letter or digit. Only letters, digits, hyphens (-), underscores (_), and periods (.) are allowed. Effect: Available options are NoSchedule, PreferNoSchedule, and NoExecute. NOTICE: If taints are used, you must configure tolerations of pods. Otherwise, a scale-out may fail or pods cannot be scheduled onto the added nodes. After a node pool is created, you can click Edit to modify its configuration. The modification will be synchronized to all nodes in the node pool.
   Max. Pods	Maximum number of pods that can run on the node, including the default system pods. This limit prevents the node from being overloaded with pods.
   Pre-installation Command	Installation script command. The script command will be Base64-transcoded. The characters of both the pre-installation and post-installation scripts are centrally calculated, and the total number of characters after transcoding cannot exceed 10,240. The script will be executed before Kubernetes software is installed. Note that if the script is incorrect, Kubernetes software may fail to be installed.
   Post-installation Command	Installation script command. The script command will be Base64-transcoded. The characters of both the pre-installation and post-installation scripts are centrally calculated, and the total number of characters after transcoding cannot exceed 10,240. The script will be executed after Kubernetes software is installed, which does not affect the installation. During post-installation script execution, pods can be scheduled normally. However, if the script execution times out, node installation will fail. To prevent pods from being scheduled to nodes with incomplete script execution, enable the option to schedule pods only after the post-installation script execution completes. CAUTION: Do not use the reboot command in the post-installation script to restart the system immediately. Instead, use the shutdown -r 1 command to restart the system with a one-minute delay.
   Kubernetes Node Name	The Kubernetes node name is the value of metadata.labels.kubernetes.io/hostname in the YAML file of the node. The following two values are supported: Node private IP: The value must be the same as the private IP address of the node (default value). Cloud server name: Use the custom cloud server name configured in node settings. Cloud server names may be duplicate. To prevent naming conflicts, CCE adds a random five-digit suffix to each cloud server name. NOTICE: This function is available only when the cluster version is v1.23.4-r0 or later. The name of a cloud server can be specified as the name of a Kubernetes node only when the cloud server is created or managed. After the cloud server is created or managed, the Kubernetes node name cannot be changed. For details, see ECS Names, Node Names, and Kubernetes Node Names. Existing nodes in the cluster still use the private IP address as the Kubernetes node name. Newly created or accepted nodes can use cloud server names. In this scenario, some Kubernetes node names may be inconsistent with node private IP addresses, and adaptation is required. For example, when configuring node affinity, you cannot use the node private IP address as the node name to configure a scheduling policy. To change the Kubernetes node name of the existing nodes to the cloud server name, remove these nodes from the cluster and accept them again. Before doing so, learn about the possible impacts on services when removing or accepting a node.

4. Click Next: Confirm. Click Submit.