Category Archives: HOWTO’s

Kubernetes: what are the Kubernetes Operator and CustomResourceDefinition
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21 July 2025

Perhaps everyone has used operators in Kubernetes, for example, PostgreSQL operator, VictoriaMetrics Operator. But what’s going on under the hood? How and to what are CustomResourceDefinition (CRD) applied, and what is an “operator”? And finally, what is the difference between a Kubernetes Operator and a Kubernetes Controller? In the previous part – Kubernetes: Kubernetes APIs,… Read More: Kubernetes: what are the Kubernetes Operator and CustomResourceDefinition0 (0) »

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TCP/IP: OSI and TCP/IP models, TCP packets, Linux sockets and ports
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19 July 2025

It’s difficult to describe in one post what thousands of books have been written about in a thousand pages, but today we’ll try to quickly review the basics of how hosts communicate on a network. First, let’s talk about the OSI and TCP/IP models, then about packet structure and connection establishment, and finally, we’ll look… Read More: TCP/IP: OSI and TCP/IP models, TCP packets, Linux sockets and… »

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VictoriaMetrics: fixing the “no matches for kind VMAnomaly” error
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10 July 2025

It’s not the first time I’ve encountered similar errors when upgrading VictoriaMetrics, so it’s time to note a solution. So, after upgrading the victoria-metrics-k8s-stack 0.55.0 => 0.56.0, errors appeared in the Operator logs: … {“logger”:”controller-runtime.source.EventHandler”,”msg”:”if kind is a CRD, it should be installed before calling Start”,”kind”:”VMAnomaly.operator.victoriametrics.com”,”error”:”no matches for kind \”VMAnomaly\” in version \”operator.victoriametrics.com/v1\””} … {“logger”:”setup”,”msg”:”cannot… Read More: VictoriaMetrics: fixing the “no matches for kind VMAnomaly” error0 (0) »

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Arch Linux: linux-firmware-nvidia: /usr/lib/firmware/nvidia/ exists in filesystem
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9 July 2025

Even though the changes were announced in emails from Arch Linux, for some reason, many people have had problems with the latest update: in the Arch Linux subreddits on Reddit, people are complaining like “Everything is broken, what should I do now?” Let’s see how to complete the upgrade and what exactly has changed. The… Read More: Arch Linux: linux-firmware-nvidia: /usr/lib/firmware/nvidia/ exists in filesystem0 (0) »

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VictoriaMetrics: migrating VMSingle and VictoriaLogs data between Kubernetes cluster
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5 July 2025

We have VictoriaMetrics and VictoriaLogs running on an AWS Elastic Kubernetes Service cluster. We do major upgrades to EKS by creating a new cluster, and therefore we have to transfer monitoring data from the old VMSingle instance to the new one. For VictoriaMetrics, there is the vmctl tool which can migrate data through the APIs… Read More: VictoriaMetrics: migrating VMSingle and VictoriaLogs data between Kubernetes cluster0 (0) »

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AI: writing an MCP server for VictoriaLogs
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22 May 2025

In the previous article, we figured out what an MCP is in general, and created a basic MCP server that was connected to Windsurf – see AI: What is the MCP? Now, let’s try to create something more useful, for example, an MCP server that will connect to VictoriaLogs and receive some data. In fact,… Read More: AI: writing an MCP server for VictoriaLogs0 (0) »

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Python: introduction to the Celery, and its monitoring configurations
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20 May 2025

To put it very simply, Celery is something we can use to perform tasks outside of our main service. For example, there is a Backend API that has some kind of endpoint to which mobile devices send information that the user has created a new whatever in the application. The task of the Backend is… Read More: Python: introduction to the Celery, and its monitoring configurations0 (0) »

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Kubernetes: find a directory with a mounted volume in a Pod on its host
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18 May 2025

We have an AWS Elastic Kubernetes Service with the VictoriaMetrics stack deployed (see VictoriaMetrics: deploying a Kubernetes monitoring stack). I need to migrate the data from the old VMSingle Pod to the new one on the new cluster, and to do this, I need to find VMSingle’s data on an EC2. Note: regarding the migration… Read More: Kubernetes: find a directory with a mounted volume in a… »

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Nexus: Configuring Docker proxy repository, and ContainerD in Kubernetes
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17 May 2025

I wrote about launching Nexus in the Nexus: launch in Kubernetes, and PyPI caching repository configuration post, now I want to add Docker image caching to PyPI, especially since Docker Hub introduces new limits from April 1, 2025 – see Docker Hub usage and limits. We’ll do it as usual: first run manually locally on… Read More: Nexus: Configuring Docker proxy repository, and ContainerD in Kubernetes0 (0) »

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