Blocking access to an ip address
Sometimes you need to block access to a specific ip address for test purposes – for instance to simulate unavailability of a web-service. Here’s how to do it on macOS… Read more »
Moving Docker container data
If you have created a container without specifying a volume, Docker will create one for you. If you later decide you’d rather have the container’s data somewhere else, you can… Read more »
Repairing a broken Postgres-BDR cluster
Postgres-BDR is an excellent multi-master replication clustering extension for PostgreSQL (https://www.2ndquadrant.com/en/resources/postgres-bdr-2ndquadrant/). We often use it for fault tolerant systems – its asynchronous and uncomplicated to set up (at least if… Read more »
A contact-tracing armband
Current plans for contact-tracing are based around mobile phones, because these have built-in capabilities for location tracking and contact detection. An alternative to mobile phones for contact-tracing would be a… Read more »
The role of statistical scoring models in contact-tracing
Each contact you have with another person potentially infects you with a virus. If the person you have contact with later tests positive for that virus, the contact you had… Read more »
Automated contact-tracing via Smartphone with Bluetooth Low-Energy contact detection
As our team was designing and implementing an open API for COVID-19 contact-tracing, we also created a smartphone app to demonstrate how fully-anonymised automated contact-tracing can be done with a… Read more »
An API-first approach to COVID-19 contact-tracing
Contact-tracing is one of the most useful tools in the fight to control the spread of a virus. Authorities in China, Singapore and South Korea have successfully deployed contact-tracing as… Read more »
A search microservice with Solr, Docker and Postgres
As I have just joined the team at Armstrong Consulting, I was encouraged to explore the capabilities of Solr within a Docker container and research ways to index existing data… Read more »
Angular/REST/Java microservice architecture – step-by-step
To familiarize ourselves with all the technologies we will be using day-to-day, we wanted to create an application using as many of them as possible as an exercise. In this post we are going to outline the steps to recreate that application.
Struggles with WordPress on Docker
This blog was running on WordPress on a dedicated Ubuntu 14.04 VM host. When I tried to update the host to Ubuntu 16.04, I broke WordPress. Rather than trying to… Read more »