Configuring QoS for a Pod

Scenario

Bandwidth preemption occurs between different containers deployed on the same node, which may cause service jitter. You can configure QoS rate limiting for inter-pod access to prevent this problem.

Notes and Constraints

The following shows constraints on setting the rate limiting for inter-pod access:

Using the CCE Console

When creating a workload on the console, you can set pod ingress and egress bandwidth limits by clicking Network Configuration in the Advanced Settings area.

Using kubectl

apiVersion: apps/v1
kind: Deployment
metadata:
  name: test
  namespace: default
  labels:
    app: test
spec:
  replicas: 2
  selector:
    matchLabels: 
      app: test
  template:
    metadata:
      labels:
        app: test
      annotations:
        kubernetes.io/ingress-bandwidth: 100M
        kubernetes.io/egress-bandwidth: 100M
    spec:
      containers:
        - name: container-1
          image: nginx:alpine
          imagePullPolicy: IfNotPresent
      imagePullSecrets:
        - name: default-secret

• kubernetes.io/ingress-bandwidth: ingress bandwidth of the pod
• kubernetes.io/egress-bandwidth: egress bandwidth of the pod

If these two parameters are not specified, the bandwidth is not limited.

After modifying the ingress or egress bandwidth limit of a pod, restart the container for the modification to take effect. After annotations are modified in a pod not managed by workloads, the container will not be restarted, so the bandwidth limits do not take effect. You can create a pod again or manually restart the container.