The ramblings of a computer geek
In part 4 of the series we are exploring Metrics. Kubernetes can collect metrics of attributes like CPU or Memory etc. These metrics are collected by a Metrics Server, you can use the built in Kubernetes one (Metrics Server), or you can use external metrics which are collected by something else, e.g. Prometheus and then … Read more
When attempting to uninstall Exchange 2016 one a couple of the servers I got this error after running the setup.exe with the uninstall switch. The uninstallation obviously failed and would not go any further. First thing was to reboot the server and retry, but that still didn’t work. Resolution Turns out this is a fairly … Read more
We were completing a migration from Exchange 2016 to Exchange SE, and we found that when attempting to decommission the old Exchange Servers that we could not due to user accounts referring within the homeMDB attribute to a mailbox database on a legacy Exchange 2016 server. In some cases these didn’t actually have a mailbox … Read more
Minikube is a great way to play with Kubernetes clusters in a quick way. But what if you want to have multiple Kubernetes clusters to play around with? You can use Minikube to start multiple clusters and then switch between them. Create Two Clusters Let’s create two clusters, we’re also going to be setting the … Read more
VMware have released an update that makes updating the Secure Boot certificates within the BIOS/UEFI NVRAM as easy as shutting down a VM and then restarting it (ensuring it is running VM Hardware 21+). But what happens if you have some hosts you have not yet updated to ESXi 8.0.3 Update 3j P09 (25429389) that … Read more
To SCP from a remote host, to a local directory, including all files and directories (recursively) you can use the following command: In the above we’re copying all files from the user’s home directory to the (current) local directory. So doing this as a real world example:
I was using Minikube and had created some users with some certificates (see a previous article), however upon trying to login the following day and attempt to perform some commands I got this error: When running a “get pods”, I see I’m not actually authenticated! Hunting the Issue Looking under the Minikube logs, and specifically … Read more
You can obtain information from a Virtual Machine via its VMTools service via the VMware PowerCLI, here is a simple working example you can build from to determine ID 1808 which shows that the machine has successfully completed its Secure Boot remediation (i.e. installing the new 2023 certificates to NVRAM and swapping to the new … Read more
We’ll create user called “dave” to use within a Kubernetes cluster, I’m using Minikube in this case. Create Private Key Create the private key: Create and Sign the CSR Now create the Certificate Signing Request (CSR): Now on this the subject is important. Here you are defining their username (CN), “dave” in this case, and … Read more
A quick way to see the API Resources for your Kubernetes cluster is via the command: You get an output such as the following: Let’s take a quick look at some of the resources available. The api-resources “pods” for example is under the “v1” ApiVersion, hence why when you are creating your YAML file for … Read more