#NOTE: This file is for reference purpose only.
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluentd
  namespace: default
  labels:
    k8s-app: fluentd-logging
    version: v1
spec:
  selector:
    matchLabels:
      k8s-app: fluentd-logging
      version: v1
  template:
    metadata:
      labels:
        k8s-app: fluentd-logging
        version: v1

      # Expose Fluentd metrics on http://localhost:24231/metrics
      # Make sure the port is not in-use. Else use different port
      annotations:
        prometheus.io/scrape: 'true'
        prometheus.io/scheme: 'http'
        prometheus.io/port: '24231'
        prometheus.io/path: '/metrics'
    spec:
      serviceAccount: fluentd
      serviceAccountName: fluentd
      tolerations:
      - key: node-role.kubernetes.io/master
        effect: NoSchedule
      containers:
      - name: fluentd
        image: fluent/fluentd-kubernetes-daemonset:v1-debian-elasticsearch
        env:
          - name:  FLUENT_ELASTICSEARCH_HOST
            value: "elasticsearch-logging"
          - name:  FLUENT_ELASTICSEARCH_PORT
            value: "9200"
          - name: FLUENT_ELASTICSEARCH_SCHEME
            value: "http"
          # Option to configure elasticsearch plugin with self signed certs
          # ================================================================
          - name: FLUENT_ELASTICSEARCH_SSL_VERIFY
            value: "true"
          # Option to configure elasticsearch plugin with tls
          # ================================================================
          - name: FLUENT_ELASTICSEARCH_SSL_VERSION
            value: "TLSv1_2"
          # X-Pack Authentication
          # =====================
          - name: FLUENT_ELASTICSEARCH_USER
            value: "elastic"
          - name: FLUENT_ELASTICSEARCH_PASSWORD
            value: "changeme"
          # Enable if Systemd setup is there in container
          - name: FLUENTD_SYSTEMD_CONF
            value: 'disable'
        resources:
          limits:
            memory: 200Mi
          requests:
            cpu: 100m
            memory: 200Mi
        # Mount conf only if any change is required in corresponding conf
        # Update same conf in ConfigMap as well
        volumeMounts:
        - name: fluentd-config
          mountPath: /fluentd/etc/kubernetes.conf
          subPath: kubernetes.conf
        
        - name: fluentd-config
          mountPath: /fluentd/etc/prometheus.conf
          subPath: prometheus.conf

        - name: fluentd-config
          mountPath: /fluentd/etc/fluent.conf
          subPath: fluent.conf

        - name: fluentd-config
          mountPath: /fluentd/etc/tail_container_parse.conf
          subPath: tail_container_parse.conf

        - name: fluentd-config
          mountPath: /fluentd/etc/systemd.conf
          subPath: systemd.conf

        # When actual pod logs in /var/lib/docker/containers, the following lines should be used.
        #- name: dockercontainerlogdirectory
        #  mountPath: /var/lib/docker/containers
        #  readOnly: true
        
        # When actual pod logs in /var/log/pods, the following lines should be used.
        - name: dockercontainerlogdirectory
          mountPath: /var/log/pods
          readOnly: true

      terminationGracePeriodSeconds: 30
      volumes:
      - name: fluentd-config
        configMap:
          name: fluentd-config

      # When actual pod logs in /var/lib/docker/containers, the following lines should be used.
      #- name: dockercontainerlogdirectory
      #  hostPath:
      #     path: /var/lib/docker/containers

      # When actual pod logs in /var/log/pods, the following lines should be used.
      - name: dockercontainerlogdirectory
        hostPath:
          path: /var/log/pods