How To Check Pod / Container Metrics on OpenShift

1. How do you monitor OpenShift pods?
2. How do you check a PODS container?
3. How do I enable OpenShift metrics?
4. How do I monitor my OpenShift cluster?
5. How do I check OpenShift services?
6. How do I update Prometheus rules?
7. How do you check a pod?
8. How do you access the container inside a pod?
9. What is difference between POD and container?
10. How do I install Heapster?
11. What is an OpenShift operator?
12. What is the Heapster?

How do you monitor OpenShift pods?

Create a YAML file for the ServiceMonitor configuration. In this example, the file is called example-app-service-monitor. yaml . This configuration makes OpenShift Monitoring scrape the metrics exposed by the sample service deployed in "Deploying a sample service", which includes the single version metric.

How do you check a PODS container?

To get the list of containers inside a pod, use the following command. For example. Alternatively, you can use the pod to describe command. You can use get and choose one of the supported output template with the --output (-o) flag.

How do I enable OpenShift metrics?

Recommendations for OpenShift Container Platform Version 3.5

Run metrics pods on dedicated OpenShift Container Platform infrastructure nodes. Use persistent storage when configuring metrics. Set USE_PERSISTENT_STORAGE=true . Keep the METRICS_RESOLUTION=30 parameter in OpenShift Container Platform metrics deployments.

How do I monitor my OpenShift cluster?

In addition to the components of the stack itself, the monitoring stack monitors:

1. CoreDNS.
2. Elasticsearch (if Logging is installed)
3. Etcd.
4. Fluentd (if Logging is installed)
5. HAProxy.
6. Image registry.
7. Kubelets.
8. Kubernetes apiserver.

How do I check OpenShift services?

The OpenShift API service, atomic-openshift-master-api. service , runs on all master instances. To see the status of the service: $ systemctl status atomic-openshift-master-api.

How do I update Prometheus rules?

Configuring rules

The rule files can be reloaded at runtime by sending SIGHUP to the Prometheus process. The changes are only applied if all rule files are well-formatted.

How do you check a pod?

Viewing pods in a project

You can view a list of pods associated with the current project, including the number of replica, the current status, number or restarts and the age of the pod. Add the -o wide flags to view the pod IP address and the node where the pod is located.

How do you access the container inside a pod?

Containers in a Pod are accessible via “localhost”; they use the same network namespace. Also, for containers, the observable host name is a Pod's name. Because containers share the same IP address and port space, you should use different ports in containers for incoming connections.

What is difference between POD and container?

“A container runs logically in a pod (though it also uses a container runtime); A group of pods, related or unrelated, run on a cluster. A pod is a unit of replication on a cluster; A cluster can contain many pods, related or unrelated [and] grouped under the tight logical borders called namespaces.”

How do I install Heapster?

Installing Heapster for Kubernetes

1. Heapster.
2. Deploy Heapster. Fix Permission issue.
3. Confirm Kubernetes DNS is working.

What is an OpenShift operator?

Operators are pieces of software that ease the operational complexity of running another piece of software. They act like an extension of the software vendor's engineering team, watching over a Kubernetes environment (such as OpenShift Container Platform) and using its current state to make decisions in real time.

What is the Heapster?

Heapster collects cluster-wide metrics from all Kubelet daemons (Kubernetes agents) installed on worker nodes. Kubelet has built in cAdvisor, which collects host metrics like CPU, disk space, and memory utilization, in addition to containers metrics.