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Running sk8s (Simple Kubernetes) on VMC with an AWS Elastic Load Balancer

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Last week I wrote about a really nifty Virtual Appliance called sk8s which can be used to quickly setup a Kubernetes (k8s) cluster for development and testing purposes. If you have not checked out that article, be sure to give that a read first to get the full context. As mentioned in the previous article, sk8s runs great on any vSphere deployment but it can also run on VMware Cloud on AWS (VMC) which adds an additional capability where an AWS Elastic Load Balancer (ELB) can automatically be provisioned and configured to front-end the k8s control plane as part of the deployment for external access.

The nice benefit of this is that you only need to configure access to the ELB and not directly to the underlying VMs running within the SDDC, both simplifying the setup but also reducing the need to expose the VMs directly to the internet. The write-up below is similar to that of the previous article, but it does expand into greater detail when deploying to VMC and all the required configuration changes within the VPC using the AWS Console and the Network and Security changes using the VMC Console.

Note: If you decide to use the integrated AWS ELB integration, please be aware that you will be charged for the consumption. For pricing, please see the AWS documentation here.

Prerequisites:

  • Access to the VMC Console and VMC SDDC
  • NSX-T Logical Network with DHCP enabled
  • AWS Access & Secret Key for automatically creating ELB (Optional)
  • govc

Step 1 - Install govc on your local desktop which has access to your VMC vSphere environment. If you have not installed govc, the quickest way is to simply download the latest binary, below is an example of installing the latest MacOS version:

curl -L https://github.com/vmware/govmomi/releases/download/v0.20.0/govc_darwin_amd64.gz | gunzip > /usr/local/bin/govc
chmod +x /usr/local/bin/govc

Step 2 - We need to verify a few settings in the AWS Console to ensure that the VPC that is connected to your SDDC is properly configured so that the provisioning of the ELB will be successful.

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Which NSX-T Policy APIs are used in the NSX-T UI in VMC?

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As the adoption of VMware Cloud on AWS (VMC) continues to accelerate, one of the very first UI interface that customers must interact with is the NSX-T UI, for enabling basic connectivity. By default the Edge Gateway has a Deny All Firewall Rule, so you will need to come to this screen to setup connectivity from your on-premises environment including a Direct Connect (DX) or Route/Policy-Based VPN. For some customers who have familiarize themselves with the NSX-T UI and its capabilities, usually the next order of business is how do I go about automating these various aspects from Day 0 setup all the way to Day N where I am migrating in or creating additional workloads.

A very common set of questions that I have been getting lately is which API do I need to look at to do X in the NSX-T UI in VMC?


Having spent some time with the NSX-T Policy API, I figure it would be useful to share the categories of NSX-T Policy API that maps back to what you see in the NSX-T UI in VMC. The list below is not exhaustive, but should it should point you in the right direction when needing to automate a particular operation.

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How to retrieve the NSX-T Overview Info (SDDC Public IP, Appliance & Infra Subnet, etc.) in VMC?

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I recently a question from one of our VMware Cloud on AWS (VMC) field folks who was looking to programmatically retrieve the SDDC Public IP Address which is shown under the NSX-T Networking & Security Overview page within the VMC Console as shown in the screenshot below. 


This actually had me stumped for a bit as I was not able to find anything mentioned in the NSX-T Policy API documentation. My last resort before pinging the NSX Engineers was to use one of my favorite browser tool, Chrome Developer Tools, which allows me to inspect all requests made to a specific web page and can also be helpful in figuring out which REST APIs the UI is using.

It turns out for this particular page, the information was not actually coming from the NSX-T Policy API but rather from another endpoint and specifically /cloud-service/api/v1/infra/sddc-user-config which I am guessing has to do with the fact that some of this information is really AWS specific information such as the Public IP Address for example. In any case, once I realized what the endpoint was and that I could still use the VMC NSX-T Reverse Proxy to retrieve the details, it was pretty straight forward.

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