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…

Kubernetes Storage on vSphere 101 – ReadWriteMany NFS

Over the last number of posts, we have spent a lot of time looking at persistent volumes (PVs) instantiated on some vSphere back-end block storage. These PVs were always ReadWriteOnce, meaning they could only be accessed by a single Pod at any one time.  In this post, we will take a look at how to create a ReadWriteMany volume, based on an NFS share, which can be accessed by multiple Pods. To begin, we will use a useful NFS server image running in a Pod, and show how to mount the exported file share to another Pod, simply to get…

NFS TCP Connections on vSphere revisited

Some time back, nearly 6 years ago in fact, I wrote about how you might hit the NFS maximum value for the number of connections you can have per IP address when mounting a lot of shares from the same NFS target. You can find the article in question here. The question came up again recently, and I found that a few things have changed since I wrote that post. In this updated post, thanks to some feedback from our NFS engineers, I wanted to revisit this scenario and explain in some further detail what the limits are. First of…

Getting to grips with NFSv4.1 and Kerberos

Over the past few weeks, I’ve been looking to update some of our older white papers on core storage topics. One of the outdated papers was on NFS, and a lot had changed in this space since the paper was last updated. Most notably, was the introduction of support for NFS v41 in vSphere 6.0, along with Kerberos based authentication. In vSphere 6.5, we also added Kerberos integrity checking. I decided to have a go at configuring this in my own lab. Before going any further, I need to thank Justin Parisi of NetApp for this guidance through this setup.…

VMworld 2017 Session on vSphere 6.5 Core Storage now on YouTube

A quick note to let you know that the session that I delivered on day 1 of VMworld 2017 is now available on YouTube. The session is entitled “A Deep Dive into vSphere 6.5 Core Storage Features and Functionality” and I delivered this with Cody Hosterman of Pure Storage. Judging by the feedback, and the number of passing comments I received in the hallways at VMworld over the past 2 days, it seems that this session was very well received indeed. Hope you like it.

Storage for containers with VMware? You got it!

Last week during a visit to VMware headquarters in Palo Alto, I had the opportunity to catch up with our engineering team who are responsible for developing storage solutions for Docker and Kubernetes running on vSphere. I have written about our Docker volume driver for vSphere and Kubernetes on vSphere already, but it’s been a while since I caught up with the team, and obviously more and more enhancements are being added all the time. I thought it might be useful to share the improvements with you here. There also seems to be some concerns raised about the availability of…

vSphere 6.5 Core Storage White Paper Now Available

I’m delighted to announce the availability of a new vSphere 6.5 core storage white paper. The paper covers new features such as VMFS-6 enhancements, policy driven Storage I/O Control, policy driven VM Encryption, NFS and iSCSI improvements and of course new limit increases in vSphere 6.5. There are too many VMware folks to thank for putting this paper together, but you’ll find them all listed in the acknowledgements section. I do want to mention one person however; a very special thanks to Cody Hosterman of Pure Storage who spent a lot of time testing many of these new features, and…