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While working with a client recently, we experienced some issues when attempting to make use of NLB external load balancer services when using AWS EKS. I wanted to investigate whether these issues had been fixed in the upstream GitHub Kubernetes repository, or if I could fix it myself, contributing back to the community in the process.
The particular Kubernetes code in question is in the part of the repository responsible for communicating with the AWS EC2 APIs. This lies entwined with the kube-controller-manager which runs on the masters. This meant I wasn’t able to use EKS directly to test the changes as the EKS master nodes are not able to be controlled or upgraded by users. Instead I needed to run the masters myself and essentially simulate EKS. As long as these simulated masters resided somewhere in AWS, I would be able to accurately test the AWS integration. I thus needed to build, package, deploy & test Kubernetes for AWS from the Kubernetes Git repository – this blog records the travails and steps of what is required to do this.
October 15, 2020
Continuous Verification is a term that is starting to pop up from time-to-time… but what does it mean? Well… according to Nora Jones and Casey Rosenthal, authors of O’Reilly’s Chaos Engineering books,
“Continuous verification (CV) is a discipline of proactive experimentation, implemented as tooling that verifies system behaviors. This stands in contrast to prior common practices in software quality assurance, which favor reactive testing, implemented as methodologies that validate known properties of software. This isn’t to say that prior common practices are invalid or should be deprecated. Alerting, testing, code reviews, monitoring, SRE practices, and the like—these are all great practices and should be encouraged”
Over the course of this post, we will unpack this statement: to understand what is behind it and what it might mean for your development process.
With the upcoming Cassandra 4.0 release, there is a lot to look forward to. Most excitingly, and following a refreshing realignment of the Open Source community around Cassandra, the next release promises to focus on fundamentals: stability, repair, observability, performance and scaling.
We must set this against the fact that Cassandra ranks pretty highly in the Stack Overflow most dreaded databases list and the reality that Cassandra is expensive to configure, operate and maintain. Finding people who have the prerequisite skills to do so is challenging.
At the time of this post, the UK is making steps to exit from an unprecedented lockdown measures for the Coronavirus. Much of the UK workforce are still making efforts to work-from-home with mainly key workers operating – at risk – in public. Many industries have shut down completely. Consequently, many businesses are reflecting on what happens next and how do we better mitigate future pandemic events?
We are immersed in the wider technology community. You will often find us attending and speaking at conferences and meet-ups across Europe (and sometimes beyond). We also contribute to open source projects, and publish opinions via our blog. Learning from others, and sharing our knowledge, ensures we remain a leader in the emerging technology space.