kubernetes - Prometheus 自动发现 K8s

Question

有人可以指导K8s自动发现的配置。 Prometheus 服务器在集群之外。我试过 Service Discovery With Kubernetes并且有人在此 discussion 中提到

I'm not yet a K8s expert enough to explain all the details here, but fundamentally it's perfectly possible to run Prometheus outside of the cluster (and required for things like redundant cross-cluster meta-monitoring). Cf. the in_cluster config option in http://prometheus.io/docs/operating/configuration/#kubernetes-sd-configurations-kubernetes_sd_config . You need to jump through certificate hoops if you run it outside.

所以，我做了一个简单的配置

  - job_name: 'kubernetes'

    kubernetes_sd_configs:
      -
        # The API server addresses. In a cluster this will normally be
        # `https://kubernetes.default.svc`. Supports multiple HA API servers.
        api_servers:
          - https://xxx.xx.xx.xx

        # Run in cluster. This will use the automounted CA certificate and bearer
        # token file at /var/run/secrets/kubernetes.io/serviceaccount/ in the pod.
        in_cluster: false

        # Optional HTTP basic authentication information.
        basic_auth:
        username: prometheus
        password: secret

        # Retry interval between watches if they disconnect.
        retry_interval: 5s

获取 unknown fields in kubernetes_sd_config: api_servers, in_cluster, retry_interval"或其他一些缩进错误

在 sample configuration ，他们提到了 ca_file: .如何从 K8s 获取该证书文件或者有什么方法可以指定 K8s config文件(~/.kube/config)

Answer 1

通过挖掘我发现的源代码，Prometheus 总是使用集群配置，如果没有 api_server在配置( discovery/kubernetes/kubernetes.go#L90-L96 )中提供。

不知何故 docs不要说 Kubernetes 配置参数，但源代码( config/config.go#L1026-L1037 )。因此没有名为 api_servers 的列表，但有一个名为 api_server 的参数.

所以你的配置应该是这样的(未经测试):

  - job_name: 'kubernetes'

    kubernetes_sd_configs:
      -
        # The API server addresses. In a cluster this will normally be
        # `https://kubernetes.default.svc`. Supports multiple HA API servers.
        api_server: https://xxx.xx.xx.xx

        # Optional HTTP basic authentication information.
        basic_auth:
          username: prometheus
          password: secret

        # specify the CA
        tls_config:
          ca_file: /path/to/ca.crt
          ## If the actual CA file isn't available you need to disable verification:
          # insecure_skip_verify: true

我不知道在哪里 retry_interval参数来自，但 AFAIK 这不是 Kubernetes 配置参数，也不是 Prometheus 配置的一部分。