1.
MiCADO webinar, 26th Sep 2019
Matthew Kendon
WordPress/Web
Application use-case

2.
Webinar on MiCADO [26/09/2019]
Agenda
• Introduction
1. Jozsef Kovacs (SZTAKI): What is MiCADO (good for)? [15 mins]
2. James Deslauriers (WMIN): How to develop an application in MiCADO? [15 mins]
• Questions [5 mins]
• Use cases
3. Matt Kendon (Outlandish): Wordpress [10 mins]
4. Amjad Ullah (WMIN): JQueuer [10 mins]
• Questions [5 mins]
9/29/2019 www.project-cola.eu 2

3.
Outlandish
● Worker Co-operative in the UK
● Based in London
● Specialising in data tools, prototyping and
campaign websites.
● Primary technologies are PHP & Node JS
● Commonly use WordPress when a client
requires CMS capabilities

4.
WordPress at Scale
● When you can putting your website behind a cache service or
system, like Cloudflare or Varnish, will help to keep your website
working when place under load.
● When caching is not feasible, you need to increase your system
resources
● MiCADO can respond to the performance of your application to
increase the resources that you need when your website is
under load.
www.micado-scale.eu/demos

5.
Architecture

6.
Architecture - NGINX
● No scaling policy
● Prometheus Exporter to export metrics on the
web-server
● Custom image with static files for the application
● Envsubst command to template in NGINX
configuration file for different environments

7.
Architecture - WordPress/PHP-FPM
● Scaling policy based on PHP-FPM pool metrics
● Prometheus exporter to expose PHP-FPM metrics to
MiCADO
● Custom image with application files embedded inside.
● Envsubst command to customise FPM Pool and PHP
ini settings
● WordPress is configured using environment variables.

8.
Architecture - Redis
● No scaling policy
● Used to provide storage for PHP session data to
be shared between WordPress containers.

9.
Application Description Template
● Kubernetes NodePort to provide outside access to the
NGINX container.
● Expose Port 9432 as this is the port that the Prometheus
exporter is available on
● Environment Variables are set here to configure the
NGINX configuration using the envsubst command-,line
tool.

10.
Application Description Template
● Environment variables used to configure the WordPress
application.
● Environment Variables used to configure the PHP-FPM
pool

11.
Application Description Template
● The scaling policy as a query that queries the PHP-FPM metrics available in
Prometheus
● The scaling rule in this case states that if the number of active processes as a
percentage of the maximum number of processes is above 60%, then a new
container should be added.

12.
Project Director: Dr. Tamas Kiss, University of Westminster, UK
The COLA Project – Cloud Orchestration at the Level of Application (COLA) - receives funding from
the European Union´s Horizon 2020 research and innovation programme under grant agreement No 731574
Thank you.
https://micado-scale.eu/
Matthew Kendon
Outlandish
9/29/2019www.project-cola.eu
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