Book Image

Hands-On Infrastructure Monitoring with Prometheus

By : Joel Bastos, Pedro Araújo
Book Image

Hands-On Infrastructure Monitoring with Prometheus

By: Joel Bastos, Pedro Araújo

Overview of this book

Prometheus is an open source monitoring system. It provides a modern time series database, a robust query language, several metric visualization possibilities, and a reliable alerting solution for traditional and cloud-native infrastructure. This book covers the fundamental concepts of monitoring and explores Prometheus architecture, its data model, and how metric aggregation works. Multiple test environments are included to help explore different configuration scenarios, such as the use of various exporters and integrations. You’ll delve into PromQL, supported by several examples, and then apply that knowledge to alerting and recording rules, as well as how to test them. After that, alert routing with Alertmanager and creating visualizations with Grafana is thoroughly covered. In addition, this book covers several service discovery mechanisms and even provides an example of how to create your own. Finally, you’ll learn about Prometheus federation, cross-sharding aggregation, and also long-term storage with the help of Thanos. By the end of this book, you’ll be able to implement and scale Prometheus as a full monitoring system on-premises, in cloud environments, in standalone instances, or using container orchestration with Kubernetes.
Table of Contents (21 chapters)
Free Chapter
1
Section 1: Introduction
5
Section 2: Getting Started with Prometheus
11
Section 3: Dashboards and Alerts
15
Section 4: Scalability, Resilience, and Maintainability

Chapter 8, Troubleshooting and Validation

  1. Prometheus is distributed with promtool which, among other functions, can check a configuration file for issues:
promtool check config /etc/prometheus/prometheus.yml
  1. The promtool utility can also read metrics in the Prometheus exposition format from stdin and validate them according to the current Prometheus standards:
curl -s http://prometheus:9090/metrics | promtool check metrics
  1. The promtool utility can be used to run instant queries against a Prometheus instance:
promtool query instant 'http://prometheus:9090' 'up == 1'
  1. You can use promtool to find every label value for a given label name. One example is the following:
promtool query labels 'http://prometheus:9090' 'mountpoint'
  1. By adding --log.level=debug to the start-up parameters.
  2. The /-/healthy endpoint will tell you (or the orchestration...