Knative v0.16.0 update

I finally got around to updating my Knative Tutorial from Knative v0.14.0 to the latest Knative v0.16.0 release. Since I skipped v0.15.0, I’m not sure which changes are due to v0.15.0 vs. v0.16.0. Regardless, there have been some notable changes that I want to outline in this blog post. This is not meant to be an exhaustive list. Feel free to let me know in the comments if there are other notable changes that I should be aware of. [Read More]

Daily COVID-19 cases notification Pipeline with Knative Eventing, BigQuery, Matplotlib and SendGrid

Motivation When I started working from home in mid-March, I was totally obsessed with COVID-19 news. I was constantly checking number of cases and news from the UK (where I currently live) and from Cyprus (where I’m originally from). It took me a couple of weeks to realize how unproductive this was. I started limiting myself to check for news once a day. This definitely helped me to regain sanity and productivity but it was manual. [Read More]

Event-Driven Image Processing Pipeline with Knative Eventing

In this post, I want to talk about an event-driven image processing pipeline that I built recently using Knative Eventing. Along the way, I’ll tell you about event sources, custom events and other components provided by Knative that simply development of event-driven architectures. Requirements Let’s first talk about the basic requirements I had for the image processing pipeline: Users upload files to an input bucket and get processed images in an output bucket. [Read More]

Workload Identity Authentication for Knative v0.14.0 on GKE

If you ever used Knative on Google Cloud, you must have heard of Knative-GCP project. As the name suggests, Knative-GCP project provides a number of sources such as CloudPubSubSource, CloudStorageSource, CloudSchedulerSource and more to help reading various Google Cloud sources into your Knative cluster. I recently updated my Knative Tutorial to use the latest Knative Eventing release v0.14.2 and its corresponding Knative-GCP release v0.14.0. I ran into a weird authentication problem that I want to outline here. [Read More]

Knative Eventing Delivery Methods

Knative Eventing docs are a little confusing when it comes to different event delivery methods it supports. It talks about event brokers and triggers and it also talks about sources, services, channels, and subscriptions. What to use and when? It’s not clear. Let’s break it down. Delivery methods There are 3 distinct methods in Knative: Simple delivery Complex delivery with optional reply Broker and Trigger delivery Broker and Trigger delivery is what you should care about most of the time. [Read More]

Knative v0.12.0 update

It’s hard to keep with Knative releases with a release every 6 weeks. I finally managed to update my Knative Tutorial for the latest Knative v0.12.0. In this blog post, I want to outline some of the differences I’ve observed. Knative Serving Knative Serving has been pretty stable in the recent releases and Knative Serving v0.12.0 is no exception. I didn’t need to update my tutorial specifically for this release. [Read More]

How to properly install Knative on GKE

The default Knative Installation instructions for Google Kubernete Engine (GKE) is problematic (see bug 2266). In this post, I want to outline what the problem is, tell you what I do, and also provide you the scripts that work for me until a proper solution is implemented either in gcloud or Knative. The problem The default Knative Installation instructions tell you to create a GKE cluster as follows: gcloud beta container clusters create $CLUSTER_NAME \ --addons=HorizontalPodAutoscaling,HttpLoadBalancing,Istio \ --machine-type=n1-standard-4 \ --cluster-version=latest --zone=$CLUSTER_ZONE \ --enable-stackdriver-kubernetes --enable-ip-alias \ --enable-autoscaling --min-nodes=1 --max-nodes=10 \ --enable-autorepair \ --scopes cloud-platform Notice the Istio add-on. [Read More]

Cluster local issue with Knative Eventing v0.9.0

In my previous post, I talked about Knative v0.9.0 and some of the eventing changes in the latest release. I’ve been playing with Knative v0.9.0 since then to read Google Cloud Pub/Sub messages using PullSubscription and I ran into a rather fundamental issue that baffled me for a while. I’d like to outline the problem and the solution here, just in case it’s useful to others. Knative Services as eventing sinks In my PullSubscription, I could define Kubernetes Services as event sinks as follows: [Read More]

Knative v0.9.0

Knative has been evolving pretty quickly. There’s a new release roughly every 6 weeks with significant changes in each release. Knative v0.7.0 was all about changes in Knative Serving (my post). Knative v0.8.0 was about deprecation of Knative Build in favor of Tekton Pipelines (my other post). Knative Serving v0.9.0 and Eventing v0.9.0 have been released a little over a week ago. In Serving, there’s a v1 API and a number of improvements on autoscaling and cold starts. [Read More]

Migrating from Knative Build to Tekton Pipelines

Knative 0.8.0 and Build Deprecation Knative 0.8.0 came out a couple of weeks ago with a number of fixes and improvements. One of the biggest changes in 0.8.0 is that Knative Build is now deprecated according to docs: Knative Installation docs also only include Knative Serving and Eventing without mentioning Build: kubectl apply \-f \\ \-f \\ \-f Good to know but there’s no explanation on why Knative Build was deprecated and any guidance on what is the replacement, if any. [Read More]