General

Prerequisites

• Docker installed
• Docker Compose installed
• HTTPie installed - https://httpie.org/

Build the required Docker images

• Execute ./build-docker-images.sh

This will build the following images:

• Spring Boot Prometheus Demo: Spring Boot app with custom metrics added

Configuration

• Please add your own Slack API webhook in ./steps/6-alerting/config.yml

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Step 1: Running Prometheus native

• Explain that Prometheus is a Go application which can just be extracted and run
• Start Prometheus via commandline ./prometheus and show that is running
• Prometheus
  • Navigate to http://localhost:9090/metrics] > show the metrics that Prometheus itself is generating
  • Navigate to http://localhost:9090 > show prometheus webinterface
  • Show Config file (prometheus.yml) -> show Targets
  • Explain that scraping can be done by various ways (Consul, DNS, or dropping in new config file)

Step 2: Run Prometheus using Docker

• Start Prometheus using docker-compose > dc up
• Show docker-compose.yml > including portmapping

Step 3: Add host metrics

• Start Prometheus using docker-compose > dc up
• Node exporter
  • Explain Node Exporter
  • Show Node Exporter config inside prometheus.yml > explain scraping
  • Navigate to http://localhost:9100/metrics
  • Explain metrics
• Prometheus
  • Navigate to http://localhost:9090
  • Show to to query for metrics using the autocomplete
  • Show how to play using the query language (console & graph)
    • node_network_receive_bytes
    • node_network_receive_bytes{device="eth0"}
    • node_network_receive_bytes{device="eth0"}[5m]
    • rate(node_network_receive_bytes{device="eth0"}[5m])

Step 4: Grafana

• Start Prometheus using docker-compose > dc up
• Grafana
  • Explain Grafana
  • Navigate to http://localhost:3000
  • Login using > admin/admin
  • Add Datasource
  • Create new Dashboard with widget containing graph from memory
    • node_network_receive_bytes
    • node_network_receive_bytes{device="eth0"}
  • Import dashboard to show the graphs coming from default monitoring of Prometheus
  • Import single server dashboard

Step 5: Monitor Docker Containers

• Start Prometheus using docker-compose > dc up
• cAdvisor
  • Explain cAdvisor
  • Navigate to http://localhost:8093
  • Show gauges and meters
  • Navigate to http://localhost:8093/metrics
  • Show metrics
• Grafana
  • Navigate to http://localhost:3000
  • Login using > admin/admin
  • Add Datasource
  • Import cAdvisor Dashboard

Step 6: Alerting

• Start Prometheus using docker-compose > dc up
• Show alert.rules
• Show alert-manager.yml
• Alert Manager
  • Explain the Alert Manager
  • Show alerts http://localhost:9093
• Prometheus
  • Show alerts in http://localhost:9090
• Introduce the Ping container
  • Stop/Start the Ping container -> docker-compose stop ping
• View the results in:
  • Slack
  • Mailslurper: http://localhost:9000

Step 7: Instrumenting applications

• Start Prometheus using docker-compose > dc up
• SpringBoot App
  • Navigate to http://localhost:8081/metrics
    • Explain that these are the wrong metrics (Spring Boot Actuator)
  • Navigate to http://localhost:8081/prometheus
    • Show the ‘helloworld_requests_total’ counter being 0
  • Navigate to http://localhost:8081/helloworld
    • This increases the counter with 1
  • Navigate to http://localhost:8081/prometheus
    • Show the ‘helloworld_requests_total’ counter being incremented
• Prometheus
  • Show ‘prometheus.yml’ > explain custom metrics path
  • Navigate to http://localhost:9090
  • Show the metric ‘helloworld_requests_total’ in the web ui

Step 8: Consul demo

• Start Prometheus using docker-compose > dc up
• Prometheus
  • Show prometheus.yml > explain consul config
  • Navigate to http://localhost:9090
  • Show targets and see that we are missing the services
• Consul
  • Navigate to http://localhost:8500
  • Show missing services
  • Register the services using ‘register-services-with-consul.sh`
  • Show the services appearing in Consul
• Prometheus
  • Navigate to http://localhost:9090
  • Show targets and see that the services have appeared

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Demo Links

• Prometheus webinterface
• Prometheus metrics
• Node Exporter
• Node Exporter metrics
• AlertManager
• cAdvisor webinterface
• cAdvisor metrics
• Grafana
• Mailslurper
• SpringBoot Demo App * metrics
• SpringBoot Demo App * helloworld

References: https://github.com/stefanprodan/dockprom