Modifying Node Pool Configurations

Notes and Constraints

The default node pool does not support the following management operations.

Configuration Management

CCE allows you to highly customize Kubernetes parameter settings on core components in a cluster. For more information, see kubelet.

This function is supported only in clusters of v1.15 and later. It is not displayed for versions earlier than v1.15.

1. Log in to the CCE console.
2. Click the cluster name to access the cluster console. Choose Nodes in the navigation pane. In the right pane, click the Node Pools tab.
3. Click Manage in the Operation column of the target node pool
4. On the Manage Components page on the right, change the values of Kubernetes parameters.

   Table 1 kubelet

   Item	Parameter	Description	Value	Modification
   CPU management policy	cpu-manager-policy	CPU management policy configuration. For details, see CPU Scheduling. none: disables pods from exclusively occupying CPUs. Select this value if you want a large pool of shareable CPU cores. static: enables pods to exclusively occupy CPUs. Select this value if your workload is sensitive to latency in CPU cache and scheduling.	Default: none	None
   QPS for requests to kube-apiserver	kube-api-qps	Number of queries per second for communication with the API server.	Default: 100	None
   Burst for requests to kube-apiserver	kube-api-burst	Maximum number of burst requests sent to the API server per second.	Default: 100	None
   Limit on the pods managed by kubelet	max-pods	Maximum number of pods that can run on a node.	For a CCE standard cluster, the maximum number of pods is determined based on the maximum number of pods on a node.	None
   Limited number of processes in a pod	pod-pids-limit	Maximum number of PIDs that can be used in each pod.	Default: -1, which indicates that the number of PIDs is not limited	None
   Whether to use a local IP address as a node's ClusterDNS	with-local-dns	The default ENI IP address of the node will be automatically added to the node's kubelet configuration as the preferred DNS address.	Default: false	None
   QPS limit on creating events	event-qps	Number of events that can be generated per second.	Default: 5	None
   Upper Limit for Burst Events	event-burst	Upper limit for burst event creation. The number of burst events can be temporarily increased to the specified value.	Default: 10	None
   Allowed unsafe sysctls	allowed-unsafe-sysctls	Insecure system configuration allowed. Starting from v1.17.17, CCE enables pod security policies for kube-apiserver. Add corresponding configurations to allowedUnsafeSysctls of a pod security policy to make the policy take effect. (This configuration is not required for clusters earlier than v1.17.17.) For details, see Example of Enabling Unsafe Sysctls in Pod Security Policy.	Default: []	None
   Node oversubscription	over-subscription-resource	Whether to enable node oversubscription. If this parameter is set to true, node oversubscription is enabled on nodes.	For clusters of versions earlier than v1.23.9-r0 or v1.25.4-r0: enabled (true) by default Disabled by default if the cluster version is v1.23.9-r0, v1.25.4-r0, v1.27-r0, or later	None
   Hybrid deployment	colocation	Whether to enable hybrid deployment on nodes. If this parameter is set to true, hybrid deployment is enabled on nodes.	For clusters of versions earlier than v1.23.9-r0 or v1.25.4-r0: enabled (true) by default Disabled by default if the cluster version is v1.23.9-r0, v1.25.4-r0, v1.27-r0, or later	None
   Topology management policy	topology-manager-policy	Set the topology management policy. Valid values are as follows: restricted: kubelet accepts only pods that achieve optimal NUMA alignment on the requested resources. best-effort: kubelet preferentially selects pods that implement NUMA alignment on CPU and device resources. none (default): The topology management policy is disabled. single-numa-node: kubelet allows only pods that are aligned to the same NUMA node in terms of CPU and device resources.	Default: none	NOTICE: Modifying topology-manager-policy and topology-manager-scope will restart kubelet, and the resource allocation of pods will be recalculated based on the modified policy. In this case, running pods may restart or even fail to receive any resources.
   Topology management scope	topology-manager-scope	Configure the resource alignment granularity of the topology management policy. Valid values are as follows: container (default) pod	Default: container
   Specified DNS configuration file	resolv-conf	DNS resolution configuration file specified by the container	Default: null	None
   Timeout for all runtime requests except long-running requests	runtime-request-timeout	Timeout interval of all runtime requests except long-running requests (pull, logs, exec, and attach).	Default: 2m0s	This parameter is available only in clusters of v1.21.10-r0, v1.23.8-r0, v1.25.3-r0, or later versions.
   Whether to allow kubelet to pull only one image at a time	serialize-image-pulls	Pull an image in serial mode. false: recommended configuration so that an image can be pulled in parallel mode to improve pod startup. true: allows images to be pulled in serial mode.	Enabled by default if the cluster version is earlier than v1.21.12-r0, v1.23.11-r0, v1.27.3-r0 or v1.25.6-r0 Disabled by default if the cluster version is v1.21.12-r0, v1.23.11-r0, v1.25.6-r0, v1.27.3-r0, or later	This parameter is available only in clusters of v1.21.10-r0, v1.23.8-r0, v1.25.3-r0, or later versions.
   Image repository pull limit per second	registry-pull-qps	QPS upper limit of an image repository.	Default: 5 The value ranges from 1 to 50.	This parameter is available only in clusters of v1.21.10-r0, v1.23.8-r0, v1.25.3-r0, or later versions.
   Upper limit of burst image pull	registry-burst	Maximum number of burst image pulls.	Default: 10 The value ranges from 1 to 100 and must be greater than or equal to the value of registry-pull-qps.	This parameter is available only in clusters of v1.21.10-r0, v1.23.8-r0, v1.25.3-r0, or later versions.
   Upper Limit for Image Garbage Collection	image-gc-high-threshold	When the kubelet disk usage reaches this value, kubelet starts to collect image garbage.	Default: 80 Value range: 1 to 100	To disable image garbage collection, set this parameter to 100. This parameter is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.
   Lower Limit for Image Garbage Collection	image-gc-low-threshold	When the disk usage reduces to this value, image garbage collection stops.	Default: 70 Value range: 1 to 100	The value of this parameter cannot be greater than the upper limit for image garbage collection. This parameter is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.
   Node memory reservation	system-reserved-mem	System memory reservation reserves memory resources for OS system daemons such as sshd and udev.	Default value: automatically calculated, which varies depending on node flavors. For details, see Node Resource Reservation Policy.	The sum of kube-reserved-mem and system-reserved-mem must be less than 50% of the minimum memory of nodes in the node pool.
   	kube-reserved-mem	Kubernetes memory reservation reserves memory resources for Kubernetes daemons such kubelet and container runtime.
   Hard eviction	memory.available	Available memory on a node.	The value is fixed at 100 MiB.	For details, see Node-pressure Eviction. NOTICE: Exercise caution when modifying an eviction configuration item. Improper configuration may cause pods to be frequently evicted or fail to be evicted when the node is overloaded. kubelet can identify the following specific file system identifiers: nodefs: main file system of a node. It is used for local disk volumes, emptyDir volumes that are not supported by memory, and log storage. For example, nodefs contains /var/lib/kubelet/. imagefs: file system partition used by a container engine.
   	nodefs.available	Percentage of the available capacity in the filesystem used by kubelet.	Default: 10% Value range: 1% to 99%
   	nodefs.inodesFree	Percentage of available inodes in the filesystem used by kubelet.	Default: 5% Value range: 1% to 99%
   	imagefs.available	Percentage of the available capacity in the filesystem used by container runtimes to store resources such as images.	Default: 10% Value range: 1% to 99%
   	imagefs.inodesFree	Percentage of available inodes in the filesystem used by container runtimes to store resources such as images.	This parameter is left blank by default. Value range: 1% to 99%
   	pid.available	Percentage of allocatable PIDs reserved for pods.	Default: 10% Value range: 1% to 99%
   Soft eviction	memory.available	Available memory on a node. The value must be greater than the hard eviction value of the same parameter, and the eviction grace period (evictionSoftGracePeriod) must be configured accordingly.	This parameter is left blank by default. Value range: 100 to 1000000
   	nodefs.available	Percentage of the available capacity in the filesystem used by kubelet. The value must be greater than the hard eviction value of the same parameter, and the eviction grace period (evictionSoftGracePeriod) must be configured accordingly.	This parameter is left blank by default. Value range: 1% to 99%
   	nodefs.inodesFree	Percentage of available inodes in the filesystem used by kubelet. The value must be greater than the hard eviction value of the same parameter, and the eviction grace period (evictionSoftGracePeriod) must be configured accordingly.	This parameter is left blank by default. Value range: 1% to 99%
   	imagefs.available	Percentage of the available capacity in the filesystem used by container runtimes to store resources such as images. The value must be greater than the hard eviction value of the same parameter, and the eviction grace period (evictionSoftGracePeriod) must be configured accordingly.	This parameter is left blank by default. Value range: 1% to 99%
   	imagefs.inodesFree	Percentage of available inodes in the filesystem used by container runtimes to store resources such as images. The value must be greater than the hard eviction value of the same parameter, and the eviction grace period (evictionSoftGracePeriod) must be configured accordingly.	This parameter is left blank by default. Value range: 1% to 99%
   	pid.available	Percentage of allocatable PIDs reserved for pods. The value must be greater than the hard eviction value of the same parameter, and the eviction grace period (evictionSoftGracePeriod) must be configured accordingly.	This parameter is left blank by default. Value range: 1% to 99%

   Table 2 kube-proxy

   Item	Parameter	Description	Value	Modification
   Maximum number of connection tracking entries	conntrack-min	Maximum number of connection tracking entries To obtain the value, run the following command: sysctl -w net.nf_conntrack_max	Default: 131072	None
   Wait time of a closed TCP connection	conntrack-tcp-timeout-close-wait	Wait time of a closed TCP connection To obtain the value, run the following command: sysctl -w net.netfilter.nf_conntrack_tcp_timeout_close_wait	Default: 1h0m0s	None

   Table 3 Docker (available only for node pools that use Docker)

   Item	Parameter	Description	Value	Modification
   Container umask	native-umask	The default value normal indicates that the umask value of the started container is 0022.	Default: normal	The parameter value cannot be changed.
   Available data space for a single container	docker-base-size	Maximum data space that can be used by each container.	Default: 0	The parameter value cannot be changed.
   Insecure image source address	insecure-registry	Whether an insecure image source address can be used.	false	The parameter value cannot be changed.
   Maximum size of a container core file	limitcore	Maximum size of a core file in a container. The unit is byte. If not specified, the value is infinity.	Default: 5368709120	None
   Limit on the number of handles in a container	default-ulimit-nofile	Maximum number of handles that can be used in a container.	Default: {soft}:{hard}	The value cannot exceed the value of the kernel parameter nr_open and cannot be a negative number. You can run the following command to obtain the kernel parameter nr_open: sysctl -a | grep nr_open
   Image pull timeout	image-pull-progress-timeout	If the image fails to be pulled before time outs, the image pull will be canceled.	Default: 1m0s	This parameter is supported in v1.25.3-r0 and later.
   Maximum Number of Concurrent Requests for Downloading an Image at a Time	max-concurrent-downloads	This parameter specifies the maximum number of concurrent requests for downloading an image at a time.	Default: 3 Value range: 1 to 20	If this parameter is set to a large value, the network performance of other services on the node may be affected or the disk I/O and CPU usage may increase. This parameter is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.
   Maximum Container Log File Size	max-size	Maximum size of a container log file to be dumped. When the size of a log file reaches this value, the current log file will be closed and a new log file will be created to continue logging.	Default: 50 Value range: 1 to 4096	If this parameter is set to a small value, important logs may be lost. If this parameter is set to a large value, too much disk space may be occupied. This parameter is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.
   Maximum Number of Container Log Files	max-file	Maximum number of log files that can be retained in a container. When the number of existing log files exceeds this value, the earliest log file will be deleted to release space for new log files.	Default: 20 Value range: 2 to 100	If this parameter is set to a small value, important logs may be lost. If this parameter is set to a large value, too much disk space may be occupied. This parameter is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.

   Table 4 containerd (available only for node pools that use containerd)

   Item	Parameter	Description	Value	Modification
   Available data space for a single container	devmapper-base-size	Maximum data space that can be used by each container.	Default: 0	The parameter value cannot be changed.
   Maximum size of a container core file	limitcore	Maximum size of a core file in a container. The unit is byte. If not specified, the value is infinity.	Default: 5368709120	None
   Limit on the number of handles in a container	default-ulimit-nofile	Maximum number of handles that can be used in a container.	Default: 1048576	The value cannot exceed the value of the kernel parameter nr_open and cannot be a negative number. You can run the following command to obtain the kernel parameter nr_open: sysctl -a | grep nr_open
   Image pull timeout	image-pull-progress-timeout	If the image fails to be pulled before time outs, the image pull will be canceled.	Default: 1m0s	This parameter is supported in v1.25.3-r0 and later.
   Verification on insure skips	insecure_skip_verify	Whether to skip repository certificate verification.	Default: false	The parameter value cannot be changed.
   Maximum Number of Concurrent Requests for Downloading an Image at a Time	max-concurrent-downloads	This parameter specifies the maximum number of concurrent requests for downloading an image at a time.	Default: 3 Value range: 1 to 20	If this parameter is set to a large value, the network performance of other services on the node may be affected or the disk I/O and CPU usage may increase. This parameter is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.
   Maximum Container Log Line Size	max-container-log-line-size	Maximum log line size of a container, in the unit of bytes. The log lines exceeding the limit will be split into multiple lines.	Default: 16384 Value range: 1 to 2097152	A larger value will lead to more containerd memory consumption. This parameter is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.

5. Click OK.