telegraf/plugins/inputs/kube_inventory/README.md

Kube_Inventory Plugin

This plugin generates metrics derived from the state of the following Kubernetes resources:

• daemonsets
• deployments
• nodes
• persistentvolumes
• persistentvolumeclaims
• pods (containers)
• statefulsets

Series Cardinality Warning

This plugin may produce a high number of series which, when not controlled for, will cause high load on your database. Use the following techniques to avoid cardinality issues:

• Use metric filtering options to exclude unneeded measurements and tags.
• Write to a database with an appropriate retention policy.
• Limit series cardinality in your database using the max-series-per-database and max-values-per-tag settings.
• Consider using the Time Series Index.
• Monitor your databases series cardinality.
• Consult the InfluxDB documentation for the most up-to-date techniques.

Configuration:

[[inputs.kube_inventory]]
  ## URL for the Kubernetes API
  url = "https://127.0.0.1"

  ## Namespace to use. Set to "" to use all namespaces.
  # namespace = "default"

  ## Use bearer token for authorization. ('bearer_token' takes priority)
  # bearer_token = "/path/to/bearer/token"
  ## OR
  # bearer_token_string = "abc_123"

  ## Set response_timeout (default 5 seconds)
  # response_timeout = "5s"

  ## Optional Resources to exclude from gathering
  ## Leave them with blank with try to gather everything available.
  ## Values can be - "daemonsets", deployments", "nodes", "persistentvolumes",
  ## "persistentvolumeclaims", "pods", "statefulsets"
  # resource_exclude = [ "deployments", "nodes", "statefulsets" ]

  ## Optional Resources to include when gathering
  ## Overrides resource_exclude if both set.
  # resource_include = [ "deployments", "nodes", "statefulsets" ]

  ## Optional TLS Config
  # tls_ca = "/path/to/cafile"
  # tls_cert = "/path/to/certfile"
  # tls_key = "/path/to/keyfile"
  ## Use TLS but skip chain & host verification
  # insecure_skip_verify = false

Kubernetes Permissions

If using RBAC authorization, you will need to create a cluster role to list "persistentvolumes" and "nodes". You will then need to make an aggregated ClusterRole that will eventually be bound to a user or group.

---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: influx:cluster:viewer
  labels:
    rbac.authorization.k8s.io/aggregate-view-telegraf: "true"
rules:
- apiGroups: [""]
  resources: ["persistentvolumes","nodes"]
  verbs: ["get","list"]

---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: influx:telegraf
aggregationRule:
  clusterRoleSelectors:
  - matchLabels:
      rbac.authorization.k8s.io/aggregate-view-telegraf: "true"
      rbac.authorization.k8s.io/aggregate-to-view: "true"
rules: [] # Rules are automatically filled in by the controller manager.

Bind the newly created aggregated ClusterRole with the following config file, updating the subjects as needed.

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: influx:telegraf:viewer
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: influx:telegraf
subjects:
- kind: ServiceAccount
  name: telegraf
  namespace: default

Metrics:

• kubernetes_daemonset
  • tags:
    • daemonset_name
    • namespace
  • fields:
    • generation
    • current_number_scheduled
    • desired_number_scheduled
    • number_available
    • number_misscheduled
    • number_ready
    • number_unavailable
    • updated_number_scheduled

• kubernetes_deployment
  • tags:
    • deployment_name
    • namespace
  • fields:
    • replicas_available
    • replicas_unavailable
    • created

• kubernetes_node
  • tags:
    • node_name
  • fields:
    • capacity_cpu_cores
    • capacity_memory_bytes
    • capacity_pods
    • allocatable_cpu_cores
    • allocatable_memory_bytes
    • allocatable_pods

• kubernetes_persistentvolume
  • tags:
    • pv_name
    • phase
    • storageclass
  • fields:
    • phase_type (int, see below)

• kubernetes_persistentvolumeclaim
  • tags:
    • pvc_name
    • namespace
    • phase
    • storageclass
  • fields:
    • phase_type (int, see below)

• kubernetes_pod_container
  • tags:
    • container_name
    • namespace
    • node_name
    • pod_name
  • fields:
    • restarts_total
    • state
    • terminated_reason
    • resource_requests_cpu_units
    • resource_requests_memory_bytes
    • resource_limits_cpu_units
    • resource_limits_memory_bytes

• kubernetes_statefulset
  • tags:
    • statefulset_name
    • namespace
  • fields:
    • created
    • generation
    • replicas
    • replicas_current
    • replicas_ready
    • replicas_updated
    • spec_replicas
    • observed_generation

pv phase_type

The persistentvolume "phase" is saved in the phase tag with a correlated numeric field called phase_type corresponding with that tag value.

Tag value	Corresponding field value
bound	0
failed	1
pending	2
released	3
available	4
unknown	5

pvc phase_type

The persistentvolumeclaim "phase" is saved in the phase tag with a correlated numeric field called phase_type corresponding with that tag value.

Tag value	Corresponding field value
bound	0
lost	1
pending	2
unknown	3

Example Output:

kubernetes_configmap,configmap_name=envoy-config,namespace=default,resource_version=56593031 created=1544103867000000000i 1547597616000000000
kubernetes_daemonset,daemonset_name=telegraf,namespace=logging number_unavailable=0i,desired_number_scheduled=11i,number_available=11i,number_misscheduled=8i,number_ready=11i,updated_number_scheduled=11i,created=1527758699000000000i,generation=16i,current_number_scheduled=11i 1547597616000000000
kubernetes_deployment,deployment_name=deployd,namespace=default replicas_unavailable=0i,created=1544103082000000000i,replicas_available=1i 1547597616000000000
kubernetes_node,node_name=ip-172-17-0-2.internal allocatable_pods=110i,capacity_memory_bytes=128837533696,capacity_pods=110i,capacity_cpu_cores=16i,allocatable_cpu_cores=16i,allocatable_memory_bytes=128732676096 1547597616000000000
kubernetes_persistentvolume,phase=Released,pv_name=pvc-aaaaaaaa-bbbb-cccc-1111-222222222222,storageclass=ebs-1-retain phase_type=3i 1547597616000000000
kubernetes_persistentvolumeclaim,namespace=default,phase=Bound,pvc_name=data-etcd-0,storageclass=ebs-1-retain phase_type=0i 1547597615000000000
kubernetes_pod,namespace=default,node_name=ip-172-17-0-2.internal,pod_name=tick1 last_transition_time=1547578322000000000i,ready="false" 1547597616000000000
kubernetes_pod_container,container_name=telegraf,namespace=default,node_name=ip-172-17-0-2.internal,pod_name=tick1,state=running resource_requests_cpu_units=0.1,resource_limits_memory_bytes=524288000,resource_limits_cpu_units=0.5,restarts_total=0i,state_code=0i,terminated_reason="",resource_requests_memory_bytes=524288000 1547597616000000000
kubernetes_statefulset,namespace=default,statefulset_name=etcd replicas_updated=3i,spec_replicas=3i,observed_generation=1i,created=1544101669000000000i,generation=1i,replicas=3i,replicas_current=3i,replicas_ready=3i 1547597616000000000