In this article I am going to satisfy my curiosity regarding how variables work in Ansible roles.An Ansible role is a set of reusable resources, such as tasks, handlers and templates that can be used from Ansible playbooks. As a software developer, I would perhaps compare roles to subroutines – neither can be used in… Read More »
In this article I will automate creation of Multipass virtual machines using Ansible. The manual process is described in an earlier article. As in the previous article, the virtual machines created will be configured as to allow for password-less login using a private key. Prerequisites In order to be able to create Multipass virtual machines,… Read More »
In this article I will show how to reduce the set of application configuration properties available to a Spring Boot test. The reason for me wanting to do this is to be able to write tests for code that relies on a dynamic set of configuration properties. The source-code of the completed example project can… Read More »
In this article I will show how to set up an Ansible inventory that makes it possible for Ansible to interact with a Multipass virtual machine. Prerequisites A Multipass virtual machine should be created according to instructions in the article Multipass Key-Based Authentication. Note where the file containing the private key is stored.The second prerequisite… Read More »
In this article I will use Prometheus and Alertmanager to send alarms when disk-space is low for a Spring Boot application. Actually, any service or application which have metrics that can be scraped by Prometheus can have alarms so the technique described in this article is not only applicable to Spring Boot services and applications.… Read More »
In this article I will show how I added disk-space metrics to the set of default metrics made available for scraping by Prometheus. There are a few ways to accomplish this but I have chosen to use data from the Spring Boot Actuator health data. A complete Spring Boot application with disk-space metrics is available… Read More »