Help Center/ Cloud Container Engine/ User Guide (ME-Abu Dhabi Region)/ Workloads/ Configuring a Container/ Labels and Annotations
Updated on 2024-01-04 GMT+08:00
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Labels and Annotations

Pod Annotations

CCE allows you to add annotations to a YAML file to realize some advanced pod functions. The following table describes the annotations you can add.

Table 1 Pod annotations

Annotation

Description

Default Value

kubernetes.AOM.log.stdout

Standard output parameter. If not specified, the standard log output of all containers is reported to AOM. You can collect stdout logs from certain containers or ignore them at all.

Example:

  • Collecting none of the stdout logs: 
    kubernetes.AOM.log.stdout: '[]'
  • Collecting stdout logs of container-1 and container-2: 
    kubernetes.AOM.log.stdout: '["container-1","container-2"]'

None

metrics.alpha.kubernetes.io/custom-endpoints

Parameter for reporting AOM monitoring metrics that you specify.

For details, see Monitoring Custom Metrics on AOM.

None

prometheus.io/scrape

Parameter for reporting Prometheus metrics. If the value is true, the current workload reports the monitoring metrics.

None

prometheus.io/path

URL for Prometheus to collect data.

/metrics

prometheus.io/port

Endpoint port number for Prometheus to collect data.

None

prometheus.io/scheme

Protocol used by Prometheus to collect data. The value can be http or https.

None

kubernetes.io/ingress-bandwidth

Ingress bandwidth of a pod.

For details, see Configuring QoS for a Pod.

None

kubernetes.io/egress-bandwidth

Egress bandwidth of a pod.

For details, see Configuring QoS for a Pod.

None

Pod Labels

When you create a workload on the console, the following labels are added to the pod by default. The value of app is the workload name.

Example YAML:

...
spec:
  selector:
    matchLabels:
      app: nginx
      version: v1
  template:
    metadata:
      labels:
        app: nginx
        version: v1
    spec:
      ...

You can also add other labels to the pod for affinity and anti-affinity scheduling. In the following figure, three pod labels (release, env, and role) are defined for workload APP 1, APP 2, and APP 3. The values of these labels vary with workload.

  • APP 1: [release:alpha;env:development;role:frontend]
  • APP 2: [release:beta;env:testing;role:frontend]
  • APP 3: [release:alpha;env:production;role:backend]
Figure 1 Label example

For example, if key/value is set to role/backend, APP 3 will be selected for affinity scheduling. For details, see Workload Affinity (podAffinity).

Parent topic: Configuring a Container