apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: promtail
  namespace: monitoring
  labels:
    app: promtail
spec:
  selector:
    matchLabels:
      app: promtail
  template:
    metadata:
      labels:
        app: promtail
    spec:
      serviceAccountName: promtail
      tolerations:
        - key: node-role.kubernetes.io/master
          operator: Exists
          effect: NoSchedule
        - key: node-role.kubernetes.io/control-plane
          operator: Exists
          effect: NoSchedule
      containers:
        - name: promtail
          image: grafana/promtail:2.9.2
          args:
            - "-config.file=/etc/promtail/promtail.yaml"
          env:
            - name: HOSTNAME
              valueFrom:
                fieldRef:
                  fieldPath: spec.nodeName
          ports:
            - name: http
              containerPort: 3101
              protocol: TCP
          resources:
            requests:
              memory: "50Mi"
              cpu: "50m"
            limits:
              memory: "128Mi"
              cpu: "100m"
          securityContext:
            readOnlyRootFilesystem: true
            runAsUser: 0
            runAsGroup: 0
          volumeMounts:
            - name: config
              mountPath: /etc/promtail
            - name: run
              mountPath: /run/promtail
            # Mount pod logs
            - name: pods
              mountPath: /var/log/pods
              readOnly: true
            # Mount container logs (for CRI-O / containerd)
            - name: containers
              mountPath: /var/log/containers
              readOnly: true
            # Machine-id for consistent instance identification
            - name: machine-id
              mountPath: /etc/machine-id
              readOnly: true
          readinessProbe:
            httpGet:
              path: /ready
              port: http
            initialDelaySeconds: 10
            periodSeconds: 10
          livenessProbe:
            httpGet:
              path: /ready
              port: http
            initialDelaySeconds: 10
            periodSeconds: 10
      volumes:
        - name: config
          configMap:
            name: promtail-config
        - name: run
          emptyDir: {}
        - name: pods
          hostPath:
            path: /var/log/pods
        - name: containers
          hostPath:
            path: /var/log/containers
        - name: machine-id
          hostPath:
            path: /etc/machine-id