apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: fluentd-gcp-v2.0
  labels:
    k8s-app: fluentd-gcp
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
    version: v2.0
spec:
  selector:
    matchLabels:
      k8s-app: fluentd-gcp
      kubernetes.io/cluster-service: "true"
      version: v2.0
  updateStrategy:
    type: RollingUpdate
  template:
    metadata:
      labels:
        k8s-app: fluentd-gcp
        kubernetes.io/cluster-service: "true"
        version: v2.0
      # This annotation ensures that fluentd does not get evicted if the node
      # supports critical pod annotation based priority scheme.
      # Note that this does not guarantee admission on the nodes (#40573).
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
    spec:
      dnsPolicy: Default
      containers:
      - name: fluentd-gcp
        image: k8s.gcr.io/fluentd-gcp:2.0.2
        # If fluentd consumes its own logs, the following situation may happen:
        # fluentd fails to send a chunk to the server => writes it to the log =>
        # tries to send this message to the server => fails to send a chunk and so on.
        # Writing to a file, which is not exported to the back-end prevents it.
        # It also allows to increase the fluentd verbosity by default.
        command:
          - '/bin/sh'
          - '-c'
          - '/run.sh $FLUENTD_ARGS 2>&1 >>/var/log/fluentd.log'
        env:
        - name: FLUENTD_ARGS
          value: --no-supervisor
        resources:
          limits:
            memory: 300Mi
          requests:
            cpu: 100m
            memory: 200Mi
        volumeMounts:
        - name: varlog
          mountPath: /var/log
        - name: varlibdockercontainers
          mountPath: /var/lib/docker/containers
          readOnly: true
        - name: libsystemddir
          mountPath: /host/lib
          readOnly: true
        - name: config-volume
          mountPath: /etc/fluent/config.d
        # Liveness probe is aimed to help in situations where fluentd
        # silently hangs for no apparent reasons until manual restart.
        # The idea of this probe is that if fluentd is not queueing or
        # flushing chunks for 5 minutes, something is not right. If
        # you want to change the fluentd configuration, reducing amount of
        # logs fluentd collects, consider changing the threshold or turning
        # liveness probe off completely.
        livenessProbe:
          initialDelaySeconds: 600
          periodSeconds: 60
          exec:
            command:
            - '/bin/sh'
            - '-c'
            - >
              LIVENESS_THRESHOLD_SECONDS=${LIVENESS_THRESHOLD_SECONDS:-300};
              STUCK_THRESHOLD_SECONDS=${LIVENESS_THRESHOLD_SECONDS:-900};
              if [ ! -e /var/log/fluentd-buffers ];
              then
                exit 1;
              fi;
              LAST_MODIFIED_DATE=`stat /var/log/fluentd-buffers | grep Modify | sed -r "s/Modify: (.*)/\1/"`;
              LAST_MODIFIED_TIMESTAMP=`date -d "$LAST_MODIFIED_DATE" +%s`;
              if [ `date +%s` -gt `expr $LAST_MODIFIED_TIMESTAMP + $STUCK_THRESHOLD_SECONDS` ];
              then
                rm -rf /var/log/fluentd-buffers;
                exit 1;
              fi;
              if [ `date +%s` -gt `expr $LAST_MODIFIED_TIMESTAMP + $LIVENESS_THRESHOLD_SECONDS` ];
              then
                exit 1;
              fi;
      nodeSelector:
        beta.kubernetes.io/fluentd-ds-ready: "true"
      tolerations:
      - key: "node.alpha.kubernetes.io/ismaster"
        effect: "NoSchedule"
      terminationGracePeriodSeconds: 30
      volumes:
      - name: varlog
        hostPath:
          path: /var/log
      - name: varlibdockercontainers
        hostPath:
          path: /var/lib/docker/containers
      - name: libsystemddir
        hostPath:
          path: /usr/lib64
      - name: config-volume
        configMap:
          name: fluentd-gcp-config
