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78 lines
3.4 KiB
Markdown
78 lines
3.4 KiB
Markdown
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# VMServiceScrape
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The `VMServiceScrape` CRD allows to define a dynamic set of services for monitoring. Services
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and scraping configurations can be matched via label selections. This allows an organization to introduce conventions
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for how metrics should be exposed. Following these conventions new services will be discovered automatically without
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need to reconfigure.
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`VMServiceScrape` object generates part of [VMAgent](./vmagent.md) configuration with
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[kubernetes service discovery](https://docs.victoriametrics.com/sd_configs.html#kubernetes_sd_configs) targets by corresponding `Service`.
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It has various options for scraping configuration of target (with basic auth,tls access, by specific port name etc.).
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Monitoring configuration based on `discoveryRole` setting. By default, `endpoints` is used to get objects from kubernetes api.
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It's also possible to use `discoveryRole: service` or `discoveryRole: endpointslices`.
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`Endpoints` objects are essentially lists of IP addresses.
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Typically, `Endpoints` objects are populated by `Service` object. `Service` object discovers `Pod`s by a label
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selector and adds those to the `Endpoints` object.
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A `Service` may expose one or more service ports backed by a list of one or multiple endpoints pointing to
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specific `Pod`s. The same reflected in the respective `Endpoints` object as well.
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The `VMServiceScrape` object discovers `Endpoints` objects and configures [VMAgent](./vmagent.md) to monitor `Pod`s.
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The `Endpoints` section of the `VMServiceScrapeSpec` is used to configure which `Endpoints` ports should be scraped.
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For advanced use cases, one may want to monitor ports of backing `Pod`s, which are not a part of the service endpoints.
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Therefore, when specifying an endpoint in the `endpoints` section, they are strictly used.
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**Note:** `endpoints` (lowercase) is the field in the `VMServiceScrape` CRD, while `Endpoints` (capitalized) is the Kubernetes object kind.
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Both `VMServiceScrape` and discovered targets may belong to any namespace. It is important for cross-namespace monitoring
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use cases, e.g. for meta-monitoring. Using the `serviceScrapeSelector` of the `VMAgentSpec`
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one can restrict the namespaces from which `VMServiceScrape`s are selected from by the respective [VMAgent](./vmagent.md) server.
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Using the `namespaceSelector` of the `VMServiceScrape` one can restrict the namespaces from which `Endpoints` can be
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discovered from. To discover targets in all namespaces the `namespaceSelector` has to be empty:
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```yaml
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apiVersion: operator.victoriametrics.com/v1beta1
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kind: VMServiceScrape
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metadata:
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name: example-service-scrape
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spec:
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namespaceSelector: {}
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# ...
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```
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More information about selectors you can find in [this doc](./vmagent.md#scraping).
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## Specification
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You can see the full actual specification of the `VMServiceScrape` resource in
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the **[API docs -> VMServiceScrape](../api.md#vmservicescrape)**.
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Also, you can check out the [examples](#examples) section.
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## Migration from Prometheus
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The `VMServiceScrape` CRD from VictoriaMetrics Operator is a drop-in replacement
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for the Prometheus `ServiceMonitor` from prometheus-operator.
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More details about migration from prometheus-operator you can read in [this doc](../migration.md).
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## Examples
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```yaml
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apiVersion: operator.victoriametrics.com/v1beta1
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kind: VMServiceScrape
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metadata:
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name: example-app
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labels:
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team: frontend
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spec:
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selector:
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matchLabels:
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app: example-app
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endpoints:
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- port: web
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```
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