CRI-O is an implementation of the Kubernetes CRI (Container Runtime Interface) to enable using OCI (Open Container Initiative) compatible runtimes. It is a lightweight alternative to using Docker as a runtime for kubernetes. It allows Kubernetes to use any OCI-compliant runtime as the container runtime for running pods.

OpsRamp supports CRI-O to discover and monitor the resource usage of your containers.

Prerequisite

Enable the metrics exporter for CRI-O. To enable the metrics, create a config file, for example /etc/crio/crio.conf.d/01-metrics.conf, and add the following:

[crio.metrics]
enable_metrics = true
metrics_port = 9090

If the endpoint is not configured then, only the metrics available from socket are collected.

Deploy CRI-O

To deploy CRI-O:

  1. Go to Setup > Integrations > Integrations.

  2. From the Available Integrations section, click Compute.

  3. From the Compute section, select Kubernetes.

  4. On the Kubernetes integration page, click Install.

  5. In the Install Kubernetes Integration window:

    1. Give a name to the integration.

    2. For Deployment, select one of the following options:

      • On prem: If the CRI-O deployment is on-premises.
      • Cloud: If the CRI-O deployment is on a public cloud such as AWS.
    3. For Container Engine, select CRI-O.

    4. Click Install. The Kubernetes integration page displays the details of the integration and YAML files.

  6. Navigate to kube-controller and do the following:

    1. Copy the YAML content from the OpsRamp integration page and paste it to a new file in kube-controller. For example, opsramp-agent-kubernetes.yaml.
    2. Execute the following command in kube-controller:
    kubectl apply -f <YAML file>
    Example:
    kubectl apply -f opsramp-agent-kubernetes.yaml
    

You can change the following values in the YAML file:

  • LOG_LEVEL: By default, the value is set to warn.
  • K8S_EVENTS: By default, the value is set to False.
  • DOCKER_EVENTS: By default, the value is set to False.
  1. Navigate to the OpsRamp console.
    1. Go to Infrastructure > Resources.
    2. Click k3s on the resource list pane.

A list of all the discovered nodes is displayed.