Knative v0.18.0 update

I got around to updating my Knative Tutorial from Knative v0.16.0 to the latest Knative Serving v0.18.0 release and Knative Eventing v0.18.1 release. In this short blog post, I want to outline a couple of minor issues I encountered during my upgrade. Note that I skipped v0.17 altogether, some of these changes might have happened in that release. Istio Installation The biggest change I encountered is how Istio is installed for Knative. [Read More]

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]

An app modernization story — Part 3 (Containerize & Redeploy)

In part 1, I talked about the initial app and its challenges. In part 2, I talked about the lift & shift to the cloud with some unexpected benefits. In this part 3 of the series, I’ll talk about how we transformed our Windows-only .NET Framework app to a containerized multi-platform .NET Core app and the huge benefits we got along the way. Why? The initial Windows VM based cloud setup served us well with minimal issues about roughly 2 years (from early 2017 to early 2019). [Read More]

An app modernization story — Part 2 (Lift & Shift)

In part 1 of app modernization series, I introduced a simple news aggregator and some of the challenges in its initial architecture. In part 2, I’ll talk about the journey to the cloud and some unexpected benefits and learnings along the way. Why Cloud? The initial backend had many issues that I outlined in part 1. After about 1 year, in late 2016, we decided to look into moving it to a more stable home. [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]

Knative Serving 0.7

As you might have heard, Knative 0.7 was out last week. One of the notable changes in this release is that Knative Serving API progressed from v1alpha to v1beta. While you can still use the old v1alpha1 API, if you want to update to v1beta, you need to rewrite your Knative service definition files. The new API also allows named revisions, silent latest deploys and a better traffic splitting configuration. [Read More]

Cloud Run as an internal async worker

Cloud Pub/Sub + Cloud Run Introduction If you’ve heard of Cloud Run, you already know that it’s great for spinning public endpoints inside stateless containers to handle HTTP request/reply type of workloads. And the best part is that you only pay for the duration of the request! However, HTTP request/reply handling is not the only use-case for Cloud Run. Combined with Cloud Pub/Sub, Cloud Run is very well suited for internal async worker type use-cases because: [Read More]