Kubernetes on vSphere 101 – Ingress

As I was researching content for the 101 series, I came across the concept of an Ingress. As I hadn’t come across it before, I wanted to do a little more research on what it actually did. It seems that in some ways, they achieve the same function as a Load Balancer in so far as they provide a mean of allowing external traffic into your cluster. But they are significantly different in how they do this. If we take the Load Balancer service type first, then for every service that is exposed via a Load Balancer, a unique external…

A first look at vRealize Network Insight for Kubernetes

Regular readers will know that I have been spending quite a bit of time recently looking at Kubernetes running on vSphere. I’ve written a number of posts on the storage side of things, which you can read here as part of my 101 series. I also posted about how you can setup vRealize Operations Manager 7.5 and add the Management Pack for Container Monitoring. This provide some really good dashboards for examining the state of your K8s clusters, as well as detailed breakdowns into K8s node VM health and performance (CPU, Memory, DIsk IO). Not only that, but you can…

Kubernetes on vSphere 101 – Services

This will be last article in the 101 series, as I think I have covered off most of the introductory storage related items at this point. One object that came up time and again during the series was services. While not specifically a storage item, it is a fundamental building block of Kubernetes applications. In the 101 series, we came across a “headless” service with the Cassandra StatefulSet demo. This was where service type ClusterIP was set to None. When we started to look at ReadWriteMany volumes, we used NFS to demonstrate these volumes in action. In the first NFS…

NSX-T Adapter for vROps – Collection Failed

Very short post – simply to highlight an issue I came across and could not find any external reference to. I added a new adapter to my vRealize Operations Manager 7.5 to monitor my NSX-T 2.3.1 deployment. The adapter was the NSX-T 2.0 Adapter. Soon after configuring it to communicate to my NSX Manager, the Collection Status for the adapter changed to Object down and the Adapter Status changes to Collection Failed. Initially I thought it as some interoperability issue, but that wasn’t the case. I went ahead and looked at the dashboard, and it reported that the Adapter Instance…

Kubernetes Storage on vSphere 101 – NFS revisited

In my most recent 101 post on ReadWriteMany volumes, I shared an example whereby we created an NFS server in a Pod which automatically exported a File Share. We then mounted the File Share to multiple NFS client Pods deployed in the same namespace. We saw how multiple Pods were able to write to the same ReadWriteMany volume, which was the purpose of the exercise. I received a few questions on the back on that post relating to the use of Services. In particular, could an external NFS client, even one outside of the K8s cluster, access a volume from…

PKS and NSX-T: Error: Timed out pinging after 600 seconds

I’m still playing with PKS 1.3 and NSX-T 2.3.1 in my lab. One issue that I kept encountering was that when on deploying my Kubernetes cluster, my master and worker nodes kept failing with a “timed out” trying to do a ping. A bosh task command showed the errors, as shown here. cormac@pks-cli:~$ bosh task Using environment ‘192.50.0.140’ as client ‘ops_manager’ Task 845 Task 845 | 16:56:36 | Preparing deployment: Preparing deployment Task 845 | 16:56:37 | Warning: DNS address not available for the link provider instance: pivotal-container-service/0c23ed00-d40a-4bfe-abee-1c Task 845 | 16:56:37 | Warning: DNS address not available for the…

Reviewing PKS logs and status

After a bit of a sabbatical, I am back to looking PKS (Pivotal Container Service) again. I wanted to look at the new version 1.3, but I had to do a bit of work on my environment to allow me to do this. Primarily, I needed to upgrade my NSX-T environment from version 2.1 to 2.3. I followed this blog post from vmtechie which provides a useful step-by-step guide. Kudos to our VMware NSX-T team as the upgrade worked without a hitch. My next step was to start work on the PKS deployment. I just did a brand new deployment…