[feature] Example configuration for providing QoS Guaranteed.

[runkecheng]

trafficstars

Is your feature request related to a problem? Please describe.

When Kubernetes creates a Pod it assigns one of these QoS classes to the Pod:

• Guaranteed
• Burstable (deploy using the default sample yaml)
• BestEffort

When Node resources are insufficient, BestEffort POD will be killed first, followed by Burstable, and finally Guaranteed, so, using higher level QoS to be better for databases.

ref: https://kubernetes.io/docs/tasks/configure-pod-container/quality-service-pod/

Describe the solution you'd like

QoS cannot be explicitly configured, it can only match the corresponding QoS rules by configuring resource limits and requests.

For a Pod to be given a QoS class of Guaranteed:

• Every Container in the Pod must have a memory limit and a memory request.
• For every Container in the Pod, the memory limit must equal the memory request.
• Every Container in the Pod must have a CPU limit and a CPU request.
• For every Container in the Pod, the CPU limit must equal the CPU request.

We can provide an example configuration for Guaranteed.

Describe alternatives you've considered

Additional context