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.

• While an ECS is being accepted into a cluster, the operating system of the ECS will be reset to the standard OS image provided by CCE to ensure node stability. The CCE console prompts you to select the operating system and the login mode during the reset.
• 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 management. Ensure that the information has been backed up.
• While an ECS is being accepted into a cluster, do not perform any operation on the ECS through the ECS console.

Constraints

• The cluster version must be 1.15 or later.
• 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.
• If a password or key has been set when the original VM node was created, reset the password or key during management. The original password or key will become invalid.
• 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.

Prerequisites

A cloud server that meets the following conditions can be accepted:

• 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 specifications, AZ, and data disk configuration can be added in batches.

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	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.

   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.
   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
   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 node anti-affinity. 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 start with a letter or digit and can contain a maximum of 63 characters, including letters, digits, hyphens (-), underscores (_), and periods (.). Effect: Available options are NoSchedule, PreferNoSchedule, and NoExecute. 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 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 script will be executed after Kubernetes software is installed, which does not affect the installation.

4. Click Next: Confirm. Click Submit.