Accepting Nodes for Management

Scenario

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

Important

  • When accepting an ECS, you can reset the ECS OS to a standard public image offered by CCE. If you choose to do so, you need to reset the password or key pair, and the previous password or key pair will become invalid.

  • LVM information, including volume groups (VGs), logical volumes (LVs), and physical volumes (PVs), will be deleted from the system disks and data disks attached to the selected ECSs during acceptance. Ensure that the information has been backed up.

  • During the acceptance of an ECS, do not perform any operation on the ECS through the ECS console.

Notes and Constraints

  • ECSs and BMSs can be managed.

Prerequisites

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. A local disk (disk-intensive disk) or a data disk of at least 20 GiB can be attached to the node, and any data disks already attached cannot be smaller than 10 GiB.

  • The node to be accepted has 2-core or higher CPU, 4 GiB or larger memory, and only one NIC.

  • Only cloud servers with the same data disk configurations can be added in batches.

  • 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.

  • Nodes in a CCE Turbo cluster must support sub-ENIs or be bound to at least 16 ENIs. For details about the node flavors, see the node flavors that can be selected 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 is attached to the node.

Procedure

  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.

    Configurations

    Table 1 Node configuration parameters

    Parameter

    Description

    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 Engine

    The container engines supported by CCE include Docker and containerd, which may vary depending on cluster types, cluster versions, and OSs. Select a container engine based on the information displayed on the CCE console. For details, see Mapping between Node OSs and Container Engines.

    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

    • 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.

    Storage Settings

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

    Table 2 Storage configuration parameters

    Parameter

    Description

    System Disk

    Directly use the system disk of the cloud server.

    Data Disk

    At least one data disk is required for the container runtime and kubelet. The data disk cannot be deleted or uninstalled. Otherwise, the node will be unavailable.

    Click Expand to configure Data Disk Space Allocation, which is used to allocate space for container engines, images, and ephemeral storage for them to run properly. For details about how to allocate data disk space, see Data Disk Space Allocation.

    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. The predefined tags are available to all resources that support tags. You can use predefined 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, 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:

    • Key: A key must contain 1 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.

    • Value: A value must contain 1 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.

    Important

    NOTICE:

    • If taints are used, you must configure tolerations in the YAML files of pods. Otherwise, scale-up 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

    Pre-installation script command, in which Chinese characters are not allowed. 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 10240.

    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

    Pre-installation script command, in which Chinese characters are not allowed. 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 10240.

    The script will be executed after Kubernetes software is installed, which does not affect the installation.

  4. Click Next: Confirm. Click Submit.

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