Before you install vRealize Operations Management Pack for Kubernetes, you must deploy the cAdvisor DaemonSet on the cluster. Based on the Kubernetes settings, you must create a cAdvisor YAML definition.
Here are a few points to consider when you create a cAdvisor YAML definition:
Containers running on hostPort must be accessible on your cluster. For example, the sample YAML definition on hostPort given below has port 31194 as the hostPort. So, the cluster must allow a connection on port 31194.
If the containers running on hostPort are not accessible, verify with hostNetwork. A sample YAML definition on hostNetwork specific to Tanzu Kubernetes Grid Integrated (TKGI) is provided in Sample cAdvisor YAML Definition on HostNetwork.
The docker path configured in the volume must be correct.
Note:The docker path can be different based on your settings.
All the nodes must have sufficient CPU and memory to run DaemonSets.
You must use the hostPort defined in the YAML definition as the cAdvisor port when you create an adapter instance.
Verify that the Kubernetes Clusters available in the TKGI Environment have the cAdvisor DaemonSet configured on port 31194.
Sample cAdvisor YAML Definition on HostPort
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
Sample cAdvisor YAML Definition on HostNetwork
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 spec: selector: matchLabels: name: vrops-cadvisor template: metadata: labels: name: vrops-cadvisor version: v0.33.0 spec: tolerations: - key: node-role.kubernetes.io/master effect: NoSchedule hostNetwork: true containers: - name: vrops-cadvisor image: google/cadvisor:v0.33.0 imagePullPolicy: Always volumeMounts: - name: rootfs mountPath: /rootfs readOnly: true - name: var-run mountPath: /var/run readOnly: false - name: sys mountPath: /sys readOnly: true - name: docker mountPath: /var/lib/docker #Mouting Docker volume readOnly: true - name: docker-sock mountPath: /var/run/docker.sock readOnly: true - name: containerd-sock mountPath: /var/run/containerd.sock readOnly: true - name: disk mountPath: /dev/disk readOnly: true ports: - name: http containerPort: 31194 #Port exposed hostPort: 31194 #Host's port - Port to expose your cAdvisor DaemonSet on each node protocol: TCP securityContext: capabilities: drop: - ALL add: - NET_BIND_SERVICE args: - --port=31194 - --profiling - --housekeeping_interval=1s terminationGracePeriodSeconds: 30 volumes: - name: rootfs hostPath: path: / - name: var-run hostPath: path: /var/run - name: sys hostPath: path: /sys - name: docker hostPath: path: /var/vcap/store/docker/docker #Docker path in Host System - name: docker-sock hostPath: path: /var/vcap/sys/run/docker/docker.sock - name: containerd-sock hostPath: path: /var/run/docker/containerd/docker-containerd.sock - name: disk hostPath: path: /dev/disk