Category Archives: Kubernetes

Kubernetes is an open-source container orchestration system for automating application deployment, scaling, and management.

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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Kubernetes: Pod resources.requests, resources.limits, and Linux cgroups
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20 July 2025

How exactly do resources.requests and resources.limits in a Kubernetes manifest works “under the hood”, and how exactly will Linux allocate and limit resources for containers? So, in Kubernetes for Pods, we can set two main parameters for CPU and Memory – the spec.containers.resources.requests and spec.containers.resources.limits fields: resources.requests: affects how and where a Pod will be… Read More: Kubernetes: Pod resources.requests, resources.limits, and Linux cgroups0 (0) »

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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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Kubernetes: 503 errors with AWS ALB possible causes and solutions
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9 July 2025

After migration to a new EKS cluster, we started getting alerts about 503 errors sometimes. The errors were happened in three cases: sometimes without any deployment, when all Pods were Running && Ready sometimes during deployment – but only on Dev, because there is only one Pod for API and sometimes during Karpenter Consolidation. Let’s… Read More: Kubernetes: 503 errors with AWS ALB possible causes and solutions0… »

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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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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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Nexus: launch in Kubernetes, and PyPI caching repository configuration
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17 May 2025

In Kubernetes, we run GitHub Runner for the build and deploy of our Backend API, see GitHub Actions: Running Actions Runner Controller in Kubernetes. But over time, we noticed that there was too much traffic on the NAT Gateway – see VictoriaLogs: a Grafana dashboard for AWS VPC Flow Logs – migrating from Grafana Loki.… Read More: Nexus: launch in Kubernetes, and PyPI caching repository configuration0 (0) »

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Kubernetes: a single AWS Load Balancer for different Kubernetes Ingresses
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21 December 2024

One day, we looked at our AWS costs on AWS Load Balancers, and understood that we needed to decrease the spends a bit. What we wanted was to have one LoadBalancer, and through it to route requests to different Kubernetes Ingresses and Services in different Namespaces. The first thing that came to mind was either… Read More: Kubernetes: a single AWS Load Balancer for different Kubernetes Ingresses0… »

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Vector.dev: introduction, AWS S3 logs, and integration with VictoriaLogs
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21 December 2024

So, we’re back to the topic of AWS VPC Flow Logs, VictoriaLogs, and the Grafana dashboard. In the post VictoriaLogs: a Grafana dashboard for AWS VPC Flow Logs – migrating from Grafana Loki, we created a cool dashboard to display various statistics on AWS NAT Gateway traffic. But there is a small drawback: all the… Read More: Vector.dev: introduction, AWS S3 logs, and integration with VictoriaLogs0 (0) »

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