Configuring 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. For details, see Monitoring Custom Metrics Using Cloud Native Cluster Monitoring.	None
prometheus.io/path	URL for Prometheus to collect data. For details, see Monitoring Custom Metrics Using Cloud Native Cluster Monitoring.	/metrics
prometheus.io/port	Endpoint port number for Prometheus to collect data. For details, see Monitoring Custom Metrics Using Cloud Native Cluster Monitoring.	None
prometheus.io/scheme	Protocol used by Prometheus to collect data. The value can be http or https. For details, see Monitoring Custom Metrics Using Cloud Native Cluster Monitoring.	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
Click to enlarge