Lab
A Cloud Guru

Using Prometheus with Kubernetes

This lab guides the student through basic Prometheus Queries (PromQL) and demonstrates how the Kubernetes architecture may be interrogated. The lab also introduces a simple means of stressing a cluster and demonstrates how those techniques affect the metrics being stored in the time series database.

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Path Info

Level

Beginner

Duration

1h 0m

Published

Apr 05, 2019

Challenge

Check that your lab environment is ready.
Log in to the master node:
```
ssh cloud_user@[Public IP here]
```
List the home directory contents:
```
ls -l 
```
Verify that stress-test.yaml is present.
Challenge

Access Prometheus from your browser.
Access Prometheus from your browser:
```
http://[Master Node public ip address]:9090
```
You may also access the sAdvisor dashboard at the following address:
```
http://[Worker Node Public IP Address]:8080
```

Challenge

Use the provided PromQL queries to interrogate your cluster.

The following are the suggested PromQL queries you may perform.

To measure CPU utilization:

node_cpu_seconds_total

irate(node_cpu_seconds_total{job="node"}[5m])

avg(irate(node_cpu_seconds_total{job="node"}[5m])) by (instance)

avg(irate(node_cpu_seconds_total{job="node",mode="idle"}[5m])) by (instance) * 100

100 - avg(irate(node_cpu_seconds_total{job="node",mode="idle"}[5m])) by (instance) * 100

To measure memory, use:

(node_memory_MemTotal_bytes - (node_memory_MemFree_bytes + node_memory_Cached_bytes + node_memory_Buffers_bytes)) / node_memory_MemTotal_bytes * 100

Challenge

Deploy the stress test and vary its replicas to examine changes.
In the terminal emulator session that is established to the Master Node:

Deploy the Stress-Test Deployment:
```
kubectl create -f stress-test.yaml
```
Interrogate the number of replicas deployed:
```
kubectl get deployments
```
Interrogate the pods running:
```
kubectl get pods
```
Challenge

Refresh your Prometheus graphs and scale the deployment up and down to vary metrics.
Use refresh on your browser to see the time series metrics change over time.

Use the following command to increase and decrease the number of replicas running in the stress-test deployment.
```
kubectl scale deployment.v1.apps/stress-test --replicas=[from 1 to 50 here]
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

What's a lab?

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.