Lab
A Cloud Guru

Working with Prometheus Queries

Once you have begun collecting metric data in Prometheus, you will need to be able to work with that data in order to obtain information you can act upon. Prometheus provides a specialized query language known as Prometheus Query Language (PromQL) that allows you to write both simple and complex queries in order to retrieve and view your metric data in a useful way. In this hands-on lab, you will have the opportunity to work with Prometheus queries by writing and executing some simple queries.

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Path Info

Level

Intermediate

Duration

30m

Published

Jun 12, 2020

Challenge

Get the Current Memory Usage for the LimeDrop Authentication Service
1. Access the Prometheus expression browser in a web browser (replacing <PROMETHEUS_SERVER_PUBLIC_IP> with the public IP address of the Prometheus server):
```
http://<PROMETHEUS_SERVER_PUBLIC_IP>:9090
```
2. Run a query to obtain the available memory amount. Supply a label to search specifically for metrics for the limedrop-auth:4455 instance.
```
mem_available_total{instance="limedrop-auth:4455"}
```
3. Log in to the Prometheus server and open the output file:
```
vi /home/cloud_user/auth_service_data.md
```
4. Enter the current available memory on the mem_available_total line.
Challenge

Get the available memory range data over a five-minute period three minutes ago.
1. Run a query in the expression browser to obtain the data:
```
mem_available_total{instance="limedrop-auth:4455"}[5m] offset 3m
```
2. Copy the output, including the timestamps.
3. On the Prometheus server, open the output file:
```
vi /home/cloud_user/auth_service_data.md
```
4. Paste in the data at the end of the file.

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.

Provided environment for hands-on practice

We will provide the credentials and environment necessary for you to practice right within your browser.

Guided walkthrough

Follow along with the author’s guided walkthrough and build something new in your provided environment!

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