Setting up Telegraf on Kubernetes

README.md

References:

• https://www.influxdata.com/integration/kubernetes-monitoring/
• https://docs.influxdata.com/platform/monitoring/containers/kubernetes/
• https://github.com/influxdata/telegraf/tree/1.12.3/plugins/inputs/kubernetes

config-map.yml

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: telegraf
  namespace: default
  labels:
    app: telegraf
data:
  telegraf.conf: |-
    [global_tags]
      infrastructure = "kubernetes"

    [agent]
      interval = "10s"
      round_interval = true
      metric_batch_size = 1000
      metric_buffer_limit = 10000
      collection_jitter = "5s"
      flush_interval = "10s"
      flush_jitter = "5s"
      precision = ""
      debug = false
      quiet = false
      logfile = ""
      hostname = "$NODE_NAME"
      omit_hostname = false

    [[outputs.influxdb]]
      urls = ["http://$INFLUXDB_HOST:$INFLUXDB_PORT"]
      database = "$INFLUXDB_DATABASE"
      retention_policy = ""
      timeout = "5s"

    [[inputs.kubernetes]]
      url = "http://$NODE_NAME:10255"
      bearer_token = "$SERVICE_ACCOUNT_TOKEN_PATH"

    [[inputs.cpu]]
      percpu = true
      totalcpu = true
      fielddrop = ["time_*"]

    [[inputs.disk]]
      ignore_fs = ["tmpfs", "devtmpfs"]

    [[inputs.diskio]]
      skip_serial_number = true

    [[inputs.kernel]]
    [[inputs.mem]]
    [[inputs.net]]
    [[inputs.processes]]
    [[inputs.swap]]
    [[inputs.system]]

daemonset.yml

---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: telegraf
  namespace: default
  labels:
    app: telegraf
spec:
  selector:
    matchLabels:
      app: telegraf
  template:
    metadata:
      labels:
        app: telegraf
    spec:
      serviceAccount: telegraf
      tolerations:
        - key: node-role.kubernetes.io/master
          effect: NoSchedule
        - key: zappi.it/dedicated
          effect: NoSchedule
          operator: Exists
      containers:
        - name: telegraf
          image: telegraf:1.8.3-alpine
          env:
            - name: INFLUXDB_HOST
              value: "influxdb.default.svc.cluster.local"
            - name: INFLUXDB_PORT
              value: "8086"
            - name: INFLUXDB_DATABASE
              value: "telegraf"
            - name: "SERVICE_ACCOUNT_TOKEN_PATH"
              value: "/var/run/secrets/kubernetes.io/serviceaccount/token"
            - name: "HOST_PROC"
              value: "/hostfs/proc"
            - name: "HOST_SYS"
              value: "/hostfs/sys"
            - name: NODE_NAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
          volumeMounts:
            - name: telegraf-configuration
              mountPath: /etc/telegraf/telegraf.conf
              subPath: telegraf.conf
              readOnly: true
            - name: host-proc
              mountPath: /hostfs/proc
              readOnly: true
            - name: host-sys
              mountPath: /hostfs/sys
              readOnly: true
            - name: host-run-utmp
              mountPath: /var/run/utmp
              readOnly: true
          resources:
            requests:
              memory: "64Mi"
              cpu: "15m"
            limits:
              memory: "72Mi"
              cpu: "30m"
      volumes:
        - name: telegraf-configuration
          configMap:
            name: telegraf
        - name: host-proc
          hostPath:
            path: /proc
        - name: host-sys
          hostPath:
            path: /sys
        - name: host-run-utmp
          hostPath:
            path: /var/run/utmp

service-account.yml

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: telegraf
  namespace: default
  labels:
    app: telegraf