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Usage Considerations

Managed Port Constraints

The following ports are used for SKE management and cannot be used for service access. Additionally, if they are blocked by the OS firewall or similar, node functions or some features may not operate correctly.

Port	Explanation
UDP 4789	calico-vxlan
TCP 5473	calico-typha
TCP 10250	kubelet
TCP 19100	node-exporter
TCP 19400	dcgm-exporter

Table. Managed Port List

kube-reserved resource constraints

kube-reserved is a feature that reserves resources for system daemons that do not run as pods on a node.

System daemons that do not run as pods include kubelet, container runtime, etc.

Reference

For detailed information about kube-reserved, refer to the following document.

https://kubernetes.io/docs/tasks/administer-cluster/reserve-compute-resources/#kube-reserved

Kubernetes Engine reserves CPU and memory based on the following criteria.

CPU specifications	Memory specifications
6% of the first core 1% of the next core (up to 2 cores) 0.5% of the next 2 cores (up to 4 cores) 0.25% of cores exceeding 4 cores	25% of the first 4 GB memory 20% of the next 4 GB memory (up to 8 GB) 10% of the next 8 GB memory (up to 16 GB) 6% of the next 112 GB memory (up to 128 GB) 2% of memory exceeding 128 GB

CPU specifications

Memory specifications

6% of the first core

1% of the next core (up to 2 cores)

0.5% of the next 2 cores (up to 4 cores)

0.25% of cores exceeding 4 cores

25% of the first 4 GB memory

20% of the next 4 GB memory (up to 8 GB)

10% of the next 8 GB memory (up to 16 GB)

6% of the next 112 GB memory (up to 128 GB)

2% of memory exceeding 128 GB

Table. CPU and Memory Standard Resource Reservation Items

Example: For a Virtual Server with 16 vCPU cores and 32 GB memory, kube-reserved is calculated as follows.
- CPU: (1 core × 0.06) + (1 core × 0.01) + (2 core × 0.005) + (12 core × 0.0025) = 0.11 core
- Memory: (4 GB × 0.25) + (4 GB × 0.2) + (8 GB × 0.1) + (16 GB × 0.06) = 3.56 GB
Example: The resources reserved based on CPU size are as follows.

CPU specifications	Resource Specification 1	Resource Specification 2	Resource Specification 3	Resource Specification 4
kube-reserved CPU	70 m	80 m	90 m	110 m

Table. Example of resources reserved according to CPU size

Example: The resources reserved based on memory size are as follows.

Memory specifications	Resource Specification 1	Resource Specification 2	Resource Specification 3	Resource Specification 4	Resource Specification 4	Resource Specification 4	Resource Specification 4
kube-reserved memory	1 GB	1.8 GB	2.6 GB	3.56 GB	5.48 GB	9.32 GB	11.88 GB

Table. Example of resources reserved according to memory size

Using type LoadBalancer service

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