Kubernetes Control Plane Monitoring

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Overview

This section aims to document specificities and to provide good base configurations for monitoring the Kubernetes Control Plane. You can then customize these configurations to add any Datadog feature.

With Datadog integrations for the API server, Etcd, Controller Manager, and Scheduler, you can collect key metrics from all four components of the Kubernetes Control Plane.

Kubernetes with Kubeadm
Kubernetes on Amazon EKS
Kubernetes on OpenShift 4
Kubernetes on OpenShift 3
Kubernetes on Rancher Kubernetes Engine (v2.5+)
Kubernetes on Rancher Kubernetes Engine (<v2.5)
Kubernetes on Managed Services (AKS, GKE)

Kubernetes with Kubeadm

The following configurations are tested on Kubernetes v1.18+.

API server

The API server integration is automatically configured. The Datadog Agent discovers it automatically.

Etcd

By providing read access to the Etcd certificates located on the host, the Datadog Agent check can communicate with Etcd and start collecting Etcd metrics.

Custom values.yaml:

datadog:
  apiKey: <DATADOG_API_KEY>
  appKey: <DATADOG_APP_KEY>
  clusterName: <CLUSTER_NAME>
  kubelet:
    tlsVerify: false
  ignoreAutoConfig:
  - etcd
  confd:
    etcd.yaml: |-
      ad_identifiers:
        - etcd
      instances:
        - prometheus_url: https://%%host%%:2379/metrics
          tls_ca_cert: /host/etc/kubernetes/pki/etcd/ca.crt
          tls_cert: /host/etc/kubernetes/pki/etcd/server.crt
          tls_private_key: /host/etc/kubernetes/pki/etcd/server.key      
agents:
  volumes:
    - hostPath:
        path: /etc/kubernetes/pki/etcd
      name: etcd-certs
  volumeMounts:
    - name: etcd-certs
      mountPath: /host/etc/kubernetes/pki/etcd
      readOnly: true
  tolerations:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
    operator: Exists

DatadogAgent Kubernetes Resource:

kind: DatadogAgent
apiVersion: datadoghq.com/v2alpha1
metadata:
  name: datadog
spec:
  global:
    credentials:
      apiKey: <DATADOG_API_KEY>
      appKey: <DATADOG_APP_KEY>
    clusterName: <CLUSTER_NAME>
    kubelet:
      tlsVerify: false
  override:
    clusterAgent:
      image:
        name: gcr.io/datadoghq/cluster-agent:latest
    nodeAgent:
      image:
        name: gcr.io/datadoghq/agent:latest
      extraConfd:
        configMap:
          name: datadog-checks
      containers:
        agent:
          volumeMounts:
            - name: etcd-certs
              readOnly: true
              mountPath: /host/etc/kubernetes/pki/etcd
            - name: disable-etcd-autoconf
              mountPath: /etc/datadog-agent/conf.d/etcd.d
      volumes:
        - name: etcd-certs
          hostPath:
            path: /etc/kubernetes/pki/etcd
        - name: disable-etcd-autoconf
          emptyDir: {}
      tolerations:
        - key: node-role.kubernetes.io/master
          operator: Exists
          effect: NoSchedule
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: datadog-checks
data:
  etcd.yaml: |-
    ad_identifiers:
      - etcd
    init_config:
    instances:
      - prometheus_url: https://%%host%%:2379/metrics
        tls_ca_cert: /host/etc/kubernetes/pki/etcd/ca.crt
        tls_cert: /host/etc/kubernetes/pki/etcd/server.crt
        tls_private_key: /host/etc/kubernetes/pki/etcd/server.key

Controller Manager and Scheduler

Insecure ports

If the insecure ports of your Controller Manager and Scheduler instances are enabled, the Datadog Agent discovers the integrations and starts collecting metrics without any additional configuration.

Secure ports

Secure ports allow authentication and authorization to protect your Control Plane components. The Datadog Agent can collect Controller Manager and Scheduler metrics by targeting their secure ports.

Custom values.yaml:

datadog:
  apiKey: <DATADOG_API_KEY>
  appKey: <DATADOG_APP_KEY>
  clusterName: <CLUSTER_NAME>
  kubelet:
    tlsVerify: false
  ignoreAutoConfig:
  - etcd
  - kube_scheduler
  - kube_controller_manager
  confd:
    etcd.yaml: |-
      ad_identifiers:
        - etcd
      instances:
        - prometheus_url: https://%%host%%:2379/metrics
          tls_ca_cert: /host/etc/kubernetes/pki/etcd/ca.crt
          tls_cert: /host/etc/kubernetes/pki/etcd/server.crt
          tls_private_key: /host/etc/kubernetes/pki/etcd/server.key      
    kube_scheduler.yaml: |-
      ad_identifiers:
        - kube-scheduler
      instances:
        - prometheus_url: https://%%host%%:10259/metrics
          ssl_verify: false
          bearer_token_auth: true      
    kube_controller_manager.yaml: |-
      ad_identifiers:
        - kube-controller-manager
      instances:
        - prometheus_url: https://%%host%%:10257/metrics
          ssl_verify: false
          bearer_token_auth: true      
agents:
  volumes:
    - hostPath:
        path: /etc/kubernetes/pki/etcd
      name: etcd-certs
  volumeMounts:
    - name: etcd-certs
      mountPath: /host/etc/kubernetes/pki/etcd
      readOnly: true
  tolerations:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
    operator: Exists

DatadogAgent Kubernetes Resource:

kind: DatadogAgent
apiVersion: datadoghq.com/v2alpha1
metadata:
  name: datadog
spec:
  global:
    credentials:
      apiKey: <DATADOG_API_KEY>
      appKey: <DATADOG_APP_KEY>
    clusterName: <CLUSTER_NAME>
    kubelet:
      tlsVerify: false
  override:
    clusterAgent:
      image:
        name: gcr.io/datadoghq/cluster-agent:latest
    nodeAgent:
      image:
        name: gcr.io/datadoghq/agent:latest
      extraConfd:
        configMap:
          name: datadog-checks
      containers:
        agent:
          volumeMounts:
            - name: etcd-certs
              readOnly: true
              mountPath: /host/etc/kubernetes/pki/etcd
            - name: disable-etcd-autoconf
              mountPath: /etc/datadog-agent/conf.d/etcd.d
            - name: disable-scheduler-autoconf
              mountPath: /etc/datadog-agent/conf.d/kube_scheduler.d
            - name: disable-controller-manager-autoconf
              mountPath: /etc/datadog-agent/conf.d/kube_controller_manager.d
      volumes:
        - name: etcd-certs
          hostPath:
            path: /etc/kubernetes/pki/etcd
        - name: disable-etcd-autoconf
          emptyDir: {}
        - name: disable-scheduler-autoconf
          emptyDir: {}
        - name: disable-controller-manager-autoconf
          emptyDir: {}
      tolerations:
        - key: node-role.kubernetes.io/master
          operator: Exists
          effect: NoSchedule
---
apiVersion: v1
kind: ConfigMap
metadata:
  name: datadog-checks
data:
  etcd.yaml: |-
    ad_identifiers:
      - etcd
    init_config:
    instances:
      - prometheus_url: https://%%host%%:2379/metrics
        tls_ca_cert: /host/etc/kubernetes/pki/etcd/ca.crt
        tls_cert: /host/etc/kubernetes/pki/etcd/server.crt
        tls_private_key: /host/etc/kubernetes/pki/etcd/server.key    
  kube_scheduler.yaml: |-
    ad_identifiers:
      - kube-scheduler
    instances:
      - prometheus_url: https://%%host%%:10259/metrics
        ssl_verify: false
        bearer_token_auth: true    
  kube_controller_manager.yaml: |-
    ad_identifiers:
      - kube-controller-manager
    instances:
      - prometheus_url: https://%%host%%:10257/metrics
        ssl_verify: false
        bearer_token_auth: true

Notes:

The ssl_verify field in the kube_controller_manager and kube_scheduler configuration needs to be set to false when using self-signed certificates.
When targeting secure ports, the bind-address option in your Controller Manager and Scheduler configuration must be reachable by the Datadog Agent. Example:

apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
controllerManager:
  extraArgs:
    bind-address: 0.0.0.0
scheduler:
  extraArgs:
    bind-address: 0.0.0.0

Kubernetes on Amazon EKS

On Amazon Elastic Kubernetes Service (EKS), API server metrics are exposed. This allows the Datadog Agent to obtain API server metrics using endpoint checks as described in the Kubernetes API server metrics check documentation. To configure the check, add the following annotations to the default/kubernetes service:

annotations:
  ad.datadoghq.com/endpoints.check_names: '["kube_apiserver_metrics"]'
  ad.datadoghq.com/endpoints.init_configs: '[{}]'
  ad.datadoghq.com/endpoints.instances:
    '[{ "prometheus_url": "https://%%host%%:%%port%%/metrics", "bearer_token_auth": "true" }]'

Other control plane components are not exposed in EKS and cannot be monitored.

Kubernetes on OpenShift 4

On OpenShift 4, all control plane components can be monitored using endpoint checks.

Prerequisites

Enable the Datadog Cluster Agent
Enable Cluster checks
Enable Endpoint checks
Ensure that you are logged in with sufficient permissions to edit services and create secrets.

API server

The API server runs behind the service kubernetes in the default namespace. Annotate this service with the kube_apiserver_metrics configuration:

oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.check_names=["kube_apiserver_metrics"]'
oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.init_configs=[{}]'
oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.instances=[{"prometheus_url": "https://%%host%%:%%port%%/metrics", "bearer_token_auth": "true"}]'
oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.resolve=ip'

The last annotation ad.datadoghq.com/endpoints.resolve is needed because the service is in front of static pods. The Datadog Cluster Agent schedules the checks as endpoint checks and dispatches them to Cluster Check Runners. The nodes they are running on can be identified with:

oc exec -it <datadog cluster agent pod> -n <datadog ns> -- agent clusterchecks

Etcd

Certificates are needed to communicate with the Etcd service, which can be found in the secret kube-etcd-client-certs in the openshift-monitoring namespace. To give the Datadog Agent access to these certificates, first copy them into the same namespace the Datadog Agent is running in:

oc get secret kube-etcd-client-certs -n openshift-monitoring -o yaml | sed 's/namespace: openshift-monitoring/namespace: <datadog agent namespace>/'  | oc create -f -

These certificates should be mounted on the Cluster Check Runner pods by adding the volumes and volumeMounts as below.

Note: Mounts are also included to disable the Etcd check autoconfiguration file packaged with the agent.

...
clusterChecksRunner:
  volumes:
    - name: etcd-certs
      secret:
        secretName: kube-etcd-client-certs
    - name: disable-etcd-autoconf
      emptyDir: {}
  volumeMounts:
    - name: etcd-certs
      mountPath: /host/etc/etcd
      readOnly: true
    - name: disable-etcd-autoconf
      mountPath: /etc/datadog-agent/conf.d/etcd.d

kind: DatadogAgent
apiVersion: datadoghq.com/v2alpha1
metadata:
  name: datadog
spec:
  override:
    clusterChecksRunner:
      containers:
        agent:
          volumeMounts:
            - name: etcd-certs
              readOnly: true
              mountPath: /etc/etcd-certs
            - name: disable-etcd-autoconf
              mountPath: /etc/datadog-agent/conf.d/etcd.d
      volumes:
        - name: etcd-certs
          secret:
            secretName: kube-etcd-client-certs
        - name: disable-etcd-autoconf
          emptyDir: {}

Then, annotate the service running in front of Etcd:

oc annotate service etcd -n openshift-etcd 'ad.datadoghq.com/endpoints.check_names=["etcd"]'
oc annotate service etcd -n openshift-etcd 'ad.datadoghq.com/endpoints.init_configs=[{}]'
oc annotate service etcd -n openshift-etcd 'ad.datadoghq.com/endpoints.instances=[{"prometheus_url": "https://%%host%%:%%port%%/metrics", "tls_ca_cert": "/etc/etcd-certs/etcd-client-ca.crt", "tls_cert": "/etc/etcd-certs/etcd-client.crt",
      "tls_private_key": "/etc/etcd-certs/etcd-client.key"}]'
oc annotate service etcd -n openshift-etcd 'ad.datadoghq.com/endpoints.resolve=ip'

The Datadog Cluster Agent schedules the checks as endpoint checks and dispatches them to Cluster Check Runners.

Controller Manager

The Controller Manager runs behind the service kube-controller-manager in the openshift-kube-controller-manager namespace. Annotate the service with the check configuration:

oc annotate service kube-controller-manager -n openshift-kube-controller-manager 'ad.datadoghq.com/endpoints.check_names=["kube_controller_manager"]'
oc annotate service kube-controller-manager -n openshift-kube-controller-manager 'ad.datadoghq.com/endpoints.init_configs=[{}]'
oc annotate service kube-controller-manager -n openshift-kube-controller-manager 'ad.datadoghq.com/endpoints.instances=[{"prometheus_url": "https://%%host%%:%%port%%/metrics", "ssl_verify": "false", "bearer_token_auth": "true"}]'
oc annotate service kube-controller-manager -n openshift-kube-controller-manager 'ad.datadoghq.com/endpoints.resolve=ip'

The Datadog Cluster Agent schedules the checks as endpoint checks and dispatches them to Cluster Check Runners.

Scheduler

The Scheduler runs behind the service scheduler in the openshift-kube-scheduler namespace. Annotate the service with the check configuration:

oc annotate service scheduler -n openshift-kube-scheduler 'ad.datadoghq.com/endpoints.check_names=["kube_scheduler"]'
oc annotate service scheduler -n openshift-kube-scheduler 'ad.datadoghq.com/endpoints.init_configs=[{}]'
oc annotate service scheduler -n openshift-kube-scheduler 'ad.datadoghq.com/endpoints.instances=[{"prometheus_url": "https://%%host%%:%%port%%/metrics", "ssl_verify": "false", "bearer_token_auth": "true"}]'
oc annotate service scheduler -n openshift-kube-scheduler 'ad.datadoghq.com/endpoints.resolve=ip'

The Datadog Cluster Agent schedules the checks as endpoint checks and dispatches them to Cluster Check Runners.

Kubernetes on OpenShift 3

On OpenShift 3, all control plane components can be monitored using endpoint checks.

Prerequisites

Enable the Datadog Cluster Agent
Enable Cluster checks
Enable Endpoint checks
Ensure that you are logged in with sufficient permissions to create and edit services.

API server

The API server runs behind the service kubernetes in the default namespace. Annotate this service with the kube_apiserver_metrics configuration:

oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.check_names=["kube_apiserver_metrics"]'
oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.init_configs=[{}]'
oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.instances=[{"prometheus_url": "https://%%host%%:%%port%%/metrics", "bearer_token_auth": "true"}]'
oc annotate service kubernetes -n default 'ad.datadoghq.com/endpoints.resolve=ip'

oc exec -it <datadog cluster agent pod> -n <datadog ns> -- agent clusterchecks

Etcd

Certificates are needed to communicate with the Etcd service, which are located on the host. These certificates should be mounted on the Cluster Check Runner pods by adding the volumes and volumeMounts as below.

Note: Mounts are also included to disable the Etcd check autoconfiguration file packaged with the agent.

...
clusterChecksRunner:
  volumes:
    - hostPath:
        path: /etc/etcd
      name: etcd-certs
    - name: disable-etcd-autoconf
      emptyDir: {}
  volumeMounts:
    - name: etcd-certs
      mountPath: /host/etc/etcd
      readOnly: true
    - name: disable-etcd-autoconf
      mountPath: /etc/datadog-agent/conf.d/etcd.d

kind: DatadogAgent
apiVersion: datadoghq.com/v2alpha1
metadata:
  name: datadog
spec:
  override:
    clusterChecksRunner:
      containers:
        agent:
          volumeMounts:
            - name: etcd-certs
              readOnly: true
              mountPath: /host/etc/etcd
            - name: disable-etcd-autoconf
              mountPath: /etc/datadog-agent/conf.d/etcd.d
      volumes:
        - name: etcd-certs
          hostPath:
            path: /etc/etcd
        - name: disable-etcd-autoconf
          emptyDir: {}

Direct edits of this service are not persisted, so make a copy of the Etcd service:

oc get service etcd -n kube-system -o yaml | sed 's/name: etcd/name: etcd-copy/'  | oc create -f -

Annotate the copied service with the check configuration:

oc annotate service etcd-copy -n openshift-etcd 'ad.datadoghq.com/endpoints.check_names=["etcd"]'
oc annotate service etcd-copy -n openshift-etcd 'ad.datadoghq.com/endpoints.init_configs=[{}]'
oc annotate service etcd-copy -n openshift-etcd 'ad.datadoghq.com/endpoints.instances=[{"prometheus_url": "https://%%host%%:%%port%%/metrics", "tls_ca_cert": "/host/etc/etcd/ca/ca.crt", "tls_cert": "/host/etc/etcd/server.crt",
      "tls_private_key": "/host/etc/etcd/server.key"}]'
oc annotate service etcd-copy -n openshift-etcd 'ad.datadoghq.com/endpoints.resolve=ip'

The Datadog Cluster Agent schedules the checks as endpoint checks and dispatches them to Cluster Check Runners.

Controller Manager and Scheduler

The Controller Manager and Scheduler run behind the same service, kube-controllers in the kube-system namespace. Direct edits of the service are not persisted, so make a copy of the service:

oc get service kube-controllers -n kube-system -o yaml | sed 's/name: kube-controllers/name: kube-controllers-copy/'  | oc create -f -

Annotate the copied service with the check configurations:

oc annotate service kube-controllers-copy -n kube-system 'ad.datadoghq.com/endpoints.check_names=["kube_controller_manager", "kube_scheduler"]'
oc annotate service kube-controllers-copy -n kube-system 'ad.datadoghq.com/endpoints.init_configs=[{}, {}]'
oc annotate service kube-controllers-copy -n kube-system 'ad.datadoghq.com/endpoints.instances=[{ "prometheus_url": "https://%%host%%:%%port%%/metrics",
      "ssl_verify": "false", "bearer_token_auth": "true" }, { "prometheus_url": "https://%%host%%:%%port%%/metrics",
      "ssl_verify": "false", "bearer_token_auth": "true" }]'
oc annotate service kube-controllers-copy -n kube-system 'ad.datadoghq.com/endpoints.resolve=ip'

The Datadog Cluster Agent schedules the checks as endpoint checks and dispatches them to Cluster Check Runners.

Kubernetes on Rancher Kubernetes Engine (v2.5+)

Rancher v2.5 relies on PushProx to expose control plane metric endpoints, this allows the Datadog Agent to run control plane checks and collect metrics.

Prerequisites

Install the Datadog Agent with the rancher-monitoring chart.
The pushprox daemonsets are deployed with rancher-monitoring and running in the cattle-monitoring-system namespace.

API server

To configure the kube_apiserver_metrics check, add the following annotations to the default/kubernetes service:

annotations:
  ad.datadoghq.com/endpoints.check_names: '["kube_apiserver_metrics"]'
  ad.datadoghq.com/endpoints.init_configs: '[{}]'
  ad.datadoghq.com/endpoints.instances: '[{ "prometheus_url": "https://%%host%%:%%port%%/metrics", "bearer_token_auth": "true" }]'

Add Kubernetes services to configure auto-discovery checks

By adding headless Kubernetes services to define check configurations, the Datadog Agent is able to target the pushprox pods and collect metrics.

Apply rancher-control-plane-services.yaml:

apiVersion: v1
kind: Service
metadata:
  name: pushprox-kube-scheduler-datadog
  namespace: cattle-monitoring-system
  labels:
    component: kube-scheduler
    k8s-app: pushprox-kube-scheduler-client
  annotations:
    ad.datadoghq.com/endpoints.check_names: '["kube_scheduler"]'
    ad.datadoghq.com/endpoints.init_configs: '[{}]'
    ad.datadoghq.com/endpoints.instances: |
      [
        {
          "prometheus_url": "http://%%host%%:10251/metrics"
        }
      ]      
spec:
  clusterIP: None
  selector:
    k8s-app: pushprox-kube-scheduler-client
---
apiVersion: v1
kind: Service
metadata:
  name: pushprox-kube-controller-manager-datadog
  namespace: cattle-monitoring-system
  labels:
    component: kube-controller-manager
    k8s-app: pushprox-kube-controller-manager-client
  annotations:
    ad.datadoghq.com/endpoints.check_names: '["kube_controller_manager"]'
    ad.datadoghq.com/endpoints.init_configs: '[{}]'
    ad.datadoghq.com/endpoints.instances: |
      [
        {
          "prometheus_url": "http://%%host%%:10252/metrics"
        }
      ]      
spec:
  clusterIP: None
  selector:
    k8s-app: pushprox-kube-controller-manager-client
---
apiVersion: v1
kind: Service
metadata:
  name: pushprox-kube-etcd-datadog
  namespace: cattle-monitoring-system
  labels:
    component: kube-etcd
    k8s-app: pushprox-kube-etcd-client
  annotations:
    ad.datadoghq.com/endpoints.check_names: '["etcd"]'
    ad.datadoghq.com/endpoints.init_configs: '[{}]'
    ad.datadoghq.com/endpoints.instances: |
      [
        {
          "prometheus_url": "https://%%host%%:2379/metrics",
          "tls_ca_cert": "/host/opt/rke/etc/kubernetes/ssl/kube-ca.pem",
          "tls_cert": "/host/opt/rke/etc/kubernetes/ssl/kube-etcd-<node-ip>.pem",
          "tls_private_key": "/host/opt/rke/etc/kubernetes/ssl/kube-etcd-<node-ip>.pem"
        }
      ]      
spec:
  clusterIP: None
  selector:
    k8s-app: pushprox-kube-etcd-client

Deploy the Datadog Agent with manifests based on the following configurations:

Custom values.yaml:

datadog:
  apiKey: <DATADOG_API_KEY>
  appKey: <DATADOG_APP_KEY>
  clusterName: <CLUSTER_NAME>
  kubelet:
    tlsVerify: false
agents:
  volumes:
    - hostPath:
        path: /opt/rke/etc/kubernetes/ssl
      name: etcd-certs
  volumeMounts:
    - name: etcd-certs
      mountPath: /host/opt/rke/etc/kubernetes/ssl
      readOnly: true
  tolerations:
  - effect: NoSchedule
    key: node-role.kubernetes.io/controlplane
    operator: Exists
  - effect: NoExecute
    key: node-role.kubernetes.io/etcd
    operator: Exists

DatadogAgent Kubernetes Resource:

kind: DatadogAgent
apiVersion: datadoghq.com/v2alpha1
metadata:
  name: datadog
spec:
  features:
    clusterChecks:
      enabled: true
  global:
    credentials:
      apiKey: <DATADOG_API_KEY>
      appKey: <DATADOG_APP_KEY>
    clusterName: <CLUSTER_NAME>
    kubelet:
      tlsVerify: false
  override:
    nodeAgent:
      containers:
        agent:
          volumeMounts:
            - name: etcd-certs
              readOnly: true
              mountPath: /host/opt/rke/etc/kubernetes/ssl
      volumes:
        - name: etcd-certs
          hostPath:
            path: /opt/rke/etc/kubernetes/ssl
      tolerations:
        - key: node-role.kubernetes.io/controlplane
          operator: Exists
          effect: NoSchedule
        - key: node-role.kubernetes.io/etcd
          operator: Exists
          effect: NoExecute

Kubernetes on Rancher Kubernetes Engine (<v2.5)

API Server, Controller Manager, and Scheduler

Install the Datadog Agent with the rancher-monitoring chart.

The control plane components run on Docker outside of Kubernetes. Within Kubernetes, the kubernetes service in the default namespace targets the control plane node IP(s). You can confirm this by running $ kubectl describe endpoints kubernetes.

You can annotate this service with endpoint checks (managed by the Datadog Cluster Agent) to monitor the API Server, Controller Manager, and Scheduler:

kubectl edit service kubernetes

metadata:
  annotations:
    ad.datadoghq.com/endpoints.check_names: '["kube_apiserver_metrics", "kube_controller_manager", "kube_scheduler"]'
    ad.datadoghq.com/endpoints.init_configs: '[{},{},{}]'
    ad.datadoghq.com/endpoints.instances: '[{ "prometheus_url": "https://%%host%%:%%port%%/metrics", "bearer_token_auth": "true" },
      {"prometheus_url": "http://%%host%%:10252/metrics"},
      {"prometheus_url": "http://%%host%%:10251/metrics"}]'

Etcd

Etcd is run in Docker outside of Kubernetes, and certificates are required to communicate with the Etcd service. The suggested steps to set up Etcd monitoring require SSH access to a control plane node running Etcd.

SSH into the control plane node by following the Rancher documentation. Confirm that Etcd is running in a Docker container with $ docker ps, and then use $ docker inspect etcd to find the location of the certificates used in the run command ("Cmd"), as well as the host path of the mounts.

The three flags in the command to look for are:

--trusted-ca-file
--cert-file
--key-file

Using the mount information available in the $ docker inspect etcd output, set volumes and volumeMounts in the Datadog Agent configuration. Also include tolerations so that the Datadog Agent can run on the control plane nodes.

The following are examples of how to configure the Datadog Agent with Helm and the Datadog Operator:

Custom values.yaml:

datadog:
  apiKey: <DATADOG_API_KEY>
  appKey: <DATADOG_APP_KEY>
  clusterName: <CLUSTER_NAME>
  kubelet:
    tlsVerify: false
agents:
  volumes:
    - hostPath:
        path: /opt/rke/etc/kubernetes/ssl
      name: etcd-certs
  volumeMounts:
    - name: etcd-certs
      mountPath: /host/opt/rke/etc/kubernetes/ssl
      readOnly: true
  tolerations:
  - effect: NoSchedule
    key: node-role.kubernetes.io/controlplane
    operator: Exists
  - effect: NoExecute
    key: node-role.kubernetes.io/etcd
    operator: Exists

DatadogAgent Kubernetes Resource:

kind: DatadogAgent
apiVersion: datadoghq.com/v2alpha1
metadata:
  name: datadog
spec:
  features:
    clusterChecks:
      enabled: true
  global:
    credentials:
      apiKey: <DATADOG_API_KEY>
      appKey: <DATADOG_APP_KEY>
    clusterName: <CLUSTER_NAME>
    kubelet:
      tlsVerify: false
  override:
    nodeAgent:
      containers:
        agent:
          volumeMounts:
            - name: etcd-certs
              readOnly: true
              mountPath: /host/opt/rke/etc/kubernetes/ssl
      volumes:
        - name: etcd-certs
          hostPath:
            path: /opt/rke/etc/kubernetes/ssl
      tolerations:
        - key: node-role.kubernetes.io/controlplane
          operator: Exists
          effect: NoSchedule
        - key: node-role.kubernetes.io/etcd
          operator: Exists
          effect: NoExecute

Set up a DaemonSet with a pause container to run the Etcd check on the nodes running Etcd. This DaemonSet runs on the host network so that it can access the Etcd service. It also has the check configuration and the tolerations needed to run on the control plane node(s). Make sure that the mounted certificate file paths match what you set up on your instance, and replace the <...> portion accordingly.

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: etcd-pause
spec:
  selector:
    matchLabels:
      app: etcd-pause
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      annotations:
        ad.datadoghq.com/pause.check_names: '["etcd"]'
        ad.datadoghq.com/pause.init_configs: '[{}]'
        ad.datadoghq.com/pause.instances: |
          [{
            "prometheus_url": "https://%%host%%:2379/metrics",
            "tls_ca_cert": "/host/etc/kubernetes/ssl/kube-ca.pem",
            "tls_cert": "/host/etc/kubernetes/ssl/kube-etcd-<...>.pem",
            "tls_private_key": "/host/etc/kubernetes/ssl/kube-etcd-<...>-key.pem"
          }]          
      labels:
        app: etcd-pause
      name: etcd-pause
    spec:
      hostNetwork: true
      containers:
      - name: pause
        image: k8s.gcr.io/pause:3.0
      tolerations:
      - effect: NoExecute
        key: node-role.kubernetes.io/etcd
        operator: Exists
      - effect: NoSchedule
        key: node-role.kubernetes.io/controlplane
        operator: Exists

To deploy the DaemonSet and the check configuration, run

kubectl apply -f <filename>

Kubernetes on managed services (AKS, GKE)

On other managed services, such as Azure Kubernetes Service (AKS) and Google Kubernetes Engine (GKE), the user cannot access the control plane components. As a result, it is not possible to run the kube_apiserver, kube_controller_manager, kube_scheduler, or etcd checks in these environments.