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: cadvisor
     namespace: kube-system
     labels:
       app: cadvisor
     annotations:
         seccomp.security.alpha.kubernetes.io/pod: 'docker/default'
   spec:
     selector:
       matchLabels:
         app: cadvisor
     template:
       metadata:
         labels:
           app: cadvisor
           version: v0.31.0
       spec:
         tolerations:
         - key: node-role.kubernetes.io/master
           effect: NoSchedule
         containers:
         - name: cadvisor
           image: google/cadvisor:v0.31.0
           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.