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How to configure Knative and containerd in VMware Event Broker Appliance (VEBA) to use a private registry?

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I was recently helping out fellow colleague Patrick Kremer who was looking into an issue that one of our users had filed on how to configure the VMware Event Broker Appliance (VEBA) so that it can take advantage of a custom container registry for deploying VEBA functions. If you attempt to specify a container image from a private container registry, especially one that has a self-signed certificate, you will see the following error:

Unable to fetch image "harbor.primp-industries.local/library/veba/kn-py-echo:1.0": failed to resolve image to digest: Get "https://harbor.primp-industries.local/v2/": x509: certificate signed by unknown authority; Get "https://harbor.primp-industries.local:443/v2/": x509: certificate signed by unknown authority

I had assumed that this should have been a pretty trivial configuration change to make the underlying Kubernetes container runtime trust the desired container registry and that there would be an easy to follow tutorial that Patrick could search for. The latest release of VEBA has moved away from using the Docker runtime to containerd and this should have helped narrow down the search results, at least that was our assumption.

Not only are there plenty of resources online, but there seem to be multiple methods depending on the version of Kubernetes and containerd which was pretty overwhelming. After several attempts using various blog articles, Patrick found that the trust error has still not gone away. I finally decided to take a closer look and discovered that there are actually two components that must be updated to properly support a private container registry: containerd & Knative Serving Controller. I eventually found this page in the Knative Serving documentation that provided a hint but ultimately, I was not able to fully grok the details until I came across this Github thread that brought clarity on how to create the required secret for the root CA certificate which would allow the Knative Serving controller to trust the root CA certificate.

Below are the instructions for the required changes and I have also attempted to simplify the steps by providing automation snippets that makes it easy for anyone to consume. In my setup, I am using Harbor registry which was built from my Harbor Virtual Appliance but the steps should apply for any other private container registry.

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vSphere Event-Driven Automation using Tanzu Application Platform (TAP) on Tanzu Community Edition

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Right before the holiday, I had spent some time exploring Tanzu Application Platform (TAP), which also recently GA'ed. TAP provides developers with an application-aware platform that focuses on making the developer experience easy for developing, building and running applications on Kubernetes.


If you are interested in a quick technical deep dive into TAP, check out this video by Scott Sisil, introducing TAP:

One of the core components of TAP is the Cloud Native Runtime (CNR), which is VMware's commercial offering of the popular open source project Knative. The VMware Event Broker Appliance (VEBA) project also makes use of Knative as our backend to provide customers with an event-driven automation solution.

Early on in the VEBA project, we knew that we wanted to develop and innovate with the community in the open but we also understood there would be users who would want an officially supported offering that they can call or file support requests when needed. Early last year, Michael Gasch, the lead architect for VEBA started to port the code from the VMware Event Router, which is the heart of VEBA into CNR's Tanzu Sources for vSphere and start unifying the two code bases. The goal is to ensure that users of the open source project VEBA will also have a consistent user experience in terms of function deployment when using the commercial offering.

As shared back in Dec, I was able to successfully deploy TAP, CNR and Sources for vSphere all running in Tanzu Community Edition (TCE), which is a completely free Enterprise-grade Kubernetes available to anyone in the community to use. For those interested, you can find the instructions below on how to deploy and configure TAP to enable vSphere event-driven automation capabilities for your infrastructure. If you are interested in deploying this using the Tanzu Kubernetes Grid (TKG) Service, check out this other recent blog post that outlines the specific steps.

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vSphere Event-Driven Automation using Tanzu Application Platform (TAP) on Tanzu Kubernetes Grid Service

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Right before the holiday, I had spent some time exploring Tanzu Application Platform (TAP), which also recently GA'ed. TAP provides developers with an application-aware platform that focuses on making the developer experience easy for developing, building and running applications on Kubernetes.


If you are interested in a quick technical deep dive into TAP, check out this video by Scott Sisil, introducing TAP:

One of the core components of TAP is the Cloud Native Runtime (CNR), which is VMware's commercial offering of the popular open source project Knative. The VMware Event Broker Appliance (VEBA) project also makes use of Knative as our backend to provide customers with an event-driven automation solution.

Early on in the VEBA project, we knew that we wanted to develop and innovate with the community in the open but we also understood there would be users who would want an officially supported offering that they can call or file support requests when needed. Early last year, Michael Gasch, the lead architect for VEBA started to port the code from the VMware Event Router, which is the heart of VEBA into CNR's Tanzu Sources for vSphere and start unifying the two code bases. The goal is to ensure that users of the open source project VEBA will also have a consistent user experience in terms of function deployment when using the commercial offering.

As shared back in Dec, I was able to successfully deploy TAP, CNR and Sources for vSphere all running on our Tanzu Kubernetes Grid Service which includes both our on-premises offering called vSphere with Tanzu and our managed service offering called VMware Cloud with Tanzu services. For those interested, you can find the instructions below on how to deploy and configure TAP to enable vSphere event-driven automation capabilities for your infrastructure.

[Read more...]