Talk: Grafana Loki Unleashed

From the Website of Grafana Loki:

Like Prometheus, but for logs!

Presented at:

• DevOps Meetup Leipzig #2 - Exploring Generative AI and Unleashing Grafana Loki -- 2023/08/23
• DevOps Meetup Thüringen - DevOps meets Machine Learning & Grafana Loki -- 2023/11/21

Slides

Slides are build with Vite and reveal.js.

$ npm install
$ npm run dev

Open http://localhost:5173/ in a browser.

Print Slides as PDF

Open http://localhost:5173/?print-pdf in a Chrome and print the pages as PDF.

Demo

Start the virtual machine by:

$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
==> default: Importing base box 'opensuse/Tumbleweed.x86_64'...
==> default: Generating MAC address for NAT networking...
…
==> default: Running provisioner: shell...
default: Running: inline script
default: Retrieving repository 'openSUSE-Tumbleweed-Non-Oss' metadata [.........done]
default: Building repository 'openSUSE-Tumbleweed-Non-Oss' cache [...done]
…
==> default: Running provisioner: shell...
default: Running: inline script
default: Archive:  /tmp/logcli-linux-amd64.zip
default:   inflating: /home/vagrant/.local/bin/logcli-linux-amd64
…

Start the containers by:

$ vagrant ssh
Have a lot of fun...
vagrant@loki:~> cd /vagrant/
vagrant@loki:/vagrant> docker compose up -d
…

These dashboards are available:

• System Overview
• Log Queries †
• Metrics Queries †
• Promtail Metrics Stage ‡

†: requires to generate some sample log data via Grafana k6:

$ vagrant ssh
Have a lot of fun...
vagrant@loki:~> cd /vagrant/
vagrant@loki:/vagrant> k6 run -e FORMAT=logfmt --iterations 100 k6/script.js

          /\      |‾‾| /‾‾/   /‾‾/   
     /\  /  \     |  |/  /   /  /    
    /  \/    \    |     (   /   ‾‾\  
   /          \   |  |\  \ |  (‾)  | 
  / __________ \  |__| \__\ \_____/ .io

  execution: local
     script: k6/script.js
     output: -

  scenarios: (100.00%) 1 scenario, 1 max VUs, 10m30s max duration (incl. graceful stop):
           * default: 100 iterations shared among 1 VUs (maxDuration: 10m0s, gracefulStop: 30s)


running (00m14.6s), 1/1 VUs, 13 complete and 0 interrupted iterations
default   [===>----------------------------------] 1 VUs  00m14.6s/10m0s  013/100 shared iters
…

‡: requires a non empty log file in /home/vagrant/promtail/log/, e.g.:

vagrant@loki:/vagrant> watch -n 1 'date >> /home/vagrant/promtail/log/date.log'