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Kubernetes on ESXi-Arm using k3s

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The tiny form factor of a Raspberry Pi (rPI) is a fantastic hardware platform to start playing with the ESXi-Arm Fling. You can already do a bunch of fun VMware things like running a lightweight vSAN Witness Node to setting up basic automation environment for PowerCLI, Terraform and Packer to running rPI OS as VM, enabling some neat use cases like consolidating your physical rPI assets which might be running RetroPi and Pi-Hole which many home labbers are doing.

In addition to VMware solutions, its is also a great platform to learn and tinker with new technologies like Kubernetes (K8s) which I am sure many of you have been hearing about 🙂 Although our vSphere with Tanzu and Tanzu Kubernetes Grid (TKG) does not currently work with the ESXi-Arm Fling, I have actually been meaning to try out a super lightweight K8s distribution designed for IoT/Edge called k3s (pronounced k-3-s) which also recently joined Cloud Native Computing Foundation (CNCF) Sandbox level.

k3s is supported on rPI and you normally would have multiple rPI devices to represent the number of nodes, for example if you want a basic 3-Node cluster, you would need three physical rPI devices. With ESXi-Arm, you can now create these nodes as VM, using just a single rPI. This opens up the door for all sorts of explorations, you can create HA cluster or try out more advanced features which might be more difficult if you needed several physical devices. If you mess up, you can simply re-deploy the VM without much pain or simply clone the VM.

In my setup, I am using 3 x Photon OS VMs. One for the primary node and two for k3s worker nodes. You can certainly install k3s on any other Arm-based OS including rPI OS (which can now run as a VM as mentioned earlier).


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Interesting Kubernetes application demos

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I am always on the lookout for cool and interesting demos to deploy, especially with some of the work I have been doing lately with vSphere with Kubernetes (K8s) and Tanzu Kubernetes Grid (TKG). I am sure many of you have probably seen the basic wordpress demos which seems to be the typical "Hello World" app for K8s and having something more compelling not only makes the demo more interesting but it can also help folks better understand how a modern applications can be built, deployed and run.

Below is a list of of the K8s demo applications that I have come across as part of my exploration and by no means is this an exhaustive list. I have been able to successfully deploy these applications running on the latest version of K8s (1.17 and 1.18) as I did come across other demos which did not work or I had issues setting up. If there are other K8s demos that folks have used, feel free to leave a comment and I will update the blog post after doing some basic testing.

For those of you who may not have a K8s environment and is running either vSphere 6.7 Update 3 or have access to a VMware Cloud on AWS SDDC, you can easily setup a TKG Cluster in under 30 minutes leveraging my TKG Demo Appliance Fling.

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How to configure network proxy with Tanzu Kubernetes Grid (TKG)?

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Network Proxies are commonly used by customers to provide connectivity from internal servers/services to access external networks like the Internet in a controlled and secured manner. While working on a recent network proxy enhancement for our VMware Event Broker Appliance (VEBA) Fling, I had setup a Squid server which is a popular network proxy solution.

I had noticed a couple of folks were asking about network proxy configuration for Standalone Tanzu Kubernetes Grid (TKG) and figure this might be interesting to explore, especially for my recently released TKG Demo Appliance Fling which enables folks to quickly go from zero to Kubernetes in just 30 minutes! I figured this would be another good opportunity to learn a bit more about TKG as well as Kubernetes (K8s) and I jokingly said to myself, how hard could this be!? 😉 Apparently it was not trivial and took a bit of trial/error to figure out the correct combination and below is the procedure that can be followed for both standard deployment of TKG as well as the TKG Demo Appliance Fling.

Proxy Setting configurations for TKG CLI

The TKG CLI uses KinD (Kubernetes in Docker) under the hood to setup the initial K8s bootstrap cluster to deploy the TKG Management Cluster. If you have not already downloaded KinD node image (registry.tkg.vmware.run/kind/node:v1.17.3_vmware.2) or if you need to go through a network proxy to do so, then the following instructions can be followed to make your Docker Client aware of a network proxy.

Here is an example of the error if Docker Client can not download the image:

# docker pull registry.tkg.vmware.run/kind/node:v1.17.3_vmware.2
Error response from daemon: Get https://registry.tkg.vmware.run/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

If you are not using a private container registry with TKG, then you also need to also ensure that the KinD Cluster can connect to your network proxy when it pulls down the required containers from the internet. Luckily, KinD can simply detect the network proxy settings of your operating system. You can either set the proxy using traditional environmental variables (http_proxy, https_proxy and no_proxy) during your use of TKG CLI or you can simply set it globally so you do not forget.

In my setup, TKG CLI is running in a Photon OS VM and global proxy settings are configured in /etc/sysconfig/proxy Proxy settings will vary across operating systems and you should check with the vendor documentation for specific instructions. The following command will set both HTTP and HTTPS proxy variables to use my proxy server and you will also want to make sure you whitelist all networks and addresses which you want to by-pass the proxy.

cat > /etc/sysconfig/proxy << EOF
PROXY_ENABLED="yes"
HTTP_PROXY="http://192.168.1.3:3128"
HTTPS_PROXY="http://192.168.1.3:3128"
NO_PROXY="localhost,192.168.1.0/24,192.168.2.0/24,registry.rainpole.io,10.2.224.4,.svc,100.64.0.0/13,100.96.0.0/11"
EOF

Note: If you are using the TKG Demo Appliance, you only need to configure the Photon OS global proxy settings. In my example, I have white listed my local 192.168.* addresses, registry.rainpole.io which is the embedded Harbor registry, 10.2.224.4 which is the internal IP Address of VMC vCenter Server, *.svc addresses which all the internal K8s services and 100.64.0.0/13 which is the CIDR range used by TKG for the Service networks and 100.96.0.0/11 which is the CIDR range used by TKG Cluster networks.

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