cAdvisor Setup

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.

   The Daemonset and service on your Kubernetes cluster is created.

3. Run kubectl get all -o wide.

   This 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.