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 »
In this article I will show how to create a Multipass virtual machine that has an additional user which can connect to the virtual machine authenticating using a private key. To accomplish this I will use cloud-init when creating the virtual machine. The cause for this is to allow creation and provisioning of Multipass virtual… Read More »
The following are a few words and some simple examples showing how to use Spring Data DynamoDB to store and retrieve data in a DynamoDB database. In the example, which consists of a few tests, I will use a local instance of DynamoDB running in a container. No prior knowledge of DynamoDB is assumed, though… Read More »
Update 2023-04-21: I have revised the K3S and Traefik installation processes and written a new article in which these are described. The Test-Drive part of this article is still relevant. In this article I will install the free open-source edition of Traefik 2, version 2.3 being the latest at the time of writing, into a… Read More »
These are a few short notes on how to log requests received by a WireMock server as well as any mock response generated in connection to a request. I have found this to come in handy when having multiple mappings loaded into WireMock and an incorrect mapping being chosen in the test.In addition, I will… Read More »
Due to problems with PayPal, I have decided to move the sales of my book Core Spring 5 Certification in Detail to Kobo. Many thanks to LeanPub for the time that has been – they have been very friendly and helpful!
In this article I will install OpenEBS on my K3S Kubernetes cluster and present a simple example showing how to allocate storage for an application running in the cluster.I will take a slight detour to kubectl user contexts and, later, I will use a Persistent Volume and a Persistent Volume Claim to make storage available… Read More »
These are instructions on how to update a K3S cluster running in Multipass virtual machines. My installation of such a cluster is described in a previous article.The procedure will update K3S, both master and agent nodes, to the latest version of K3S. Master Node When updating the master node I take the opportunity to obtain… Read More »