To deploy cAdvisor for monitoring Linux containers using the YAML file, you have to perform the following actions.

Procedure

  1. Create cAdvisor.yaml (Daemaonset yaml).
    apiVersion: apps/v1 # apps/v1beta2 in Kube 1.8, extensions/v1beta1 in Kube < 1.8
    kind: DaemonSet
    metadata:
      name: vrops-cadvisor
      namespace: kube-system
      labels:
        app: vrops-cadvisor
      annotations:
          seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
    spec:
      selector:
        matchLabels:
          app: vrops-cadvisor
      template:
        metadata:
          labels:
            app: vrops-cadvisor
            version: v0.33.0
        spec:
          tolerations:
          - key: node-role.kubernetes.io/master
            effect: NoSchedule
          containers:
          - name: vrops-cadvisor
            image: google/cadvisor:v0.33.0
            resources:
              requests:
                memory: 250Mi
                cpu: 250m
              limits:
                cpu: 400m
            volumeMounts:
            - name: rootfs
              mountPath: /rootfs
              readOnly: true
            - name: var-run
              mountPath: /var/run
              readOnly: true
            - name: sys
              mountPath: /sys
              readOnly: true
            - name: docker
              mountPath: /var/lib/docker  #Mouting Docker volume 
              readOnly: true
            - name: disk
              mountPath: /dev/disk
              readOnly: true
            ports:
              - name: http
                containerPort: 8080 #Port exposed
                hostPort : 31194 #Host's port - Port to expose your cAdvisor DaemonSet on each node
                protocol: TCP
          automountServiceAccountToken: false
          terminationGracePeriodSeconds: 30
          volumes:
          - name: rootfs
            hostPath:
              path: /
          - name: var-run
            hostPath:
              path: /var/run
          - name: sys
            hostPath:
              path: /sys
          - name: docker
            hostPath:
              path: /var/lib/docker #Docker path in Host System
          - name: disk
            hostPath:
              path: /dev/disk
  2. Run kubectl apply -f cadvisor.yaml.

    Daemonset and service on your Kubernetes cluster is created.

  3. Run kubectl get all -o wide.

    Helps you see where the cadvisor containter is created.

  4. Copy the IP address of the node and the port which the cadvisor service has exposed.
  5. Add this as a job in prometheus.yml file in the Prometheus server.