Category Archives: Kubernetes

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

Apache Druid: overview, running in Kubernetes and monitoring with Prometheus
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18 September 2022

Apache Druid is a columnar database, focused on working with large amounts of data, combining the features and benefits of Time-Series Database, Data Warehouse, and a search engine. The general task is to set up monitoring of the Druid cluster in Kubernetes, so at first, we will see what it is in general and how… Read More: Apache Druid: overview, running in Kubernetes and monitoring with Prometheus0… »

Kubernetes: Krew plugins manager, and useful kubectl plugins list
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1 October 2021

One of the most valuable features of the kubectl utility is its plugins. Of course, there are things like Lens, widely used by developers who don’t like working in the terminal, or tools like k9s, but kubectl‘s plugins worth for a dedicated post. So, in this post, we will install Krew – kubectl‘s plugins manager,… Read More: Kubernetes: Krew plugins manager, and useful kubectl plugins list0 (0) »

Kubernetes: Helm – “x509: certificate signed by unknown authority”, and ServiceAccount for Pod
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29 September 2021

We have Github runners in our AWS Elastic Kubernetes service cluster, that are used to build Docker images and deploy them with Helm or ArgoCD. On the first helm install run in a Github runner’s Pod, we are getting the “x509: certificate signed by unknown authority” error: [simterm] # helm –kube-apiserver=https://kubernetes.default.svc.cluster.local list Error: Kubernetes cluster unreachable:… Read More: Kubernetes: Helm – “x509: certificate signed by unknown authority”, and… »

AWS: Web Application Firewall overview, configuration, and its monitoring
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19 July 2021

AWS WAF (Web Application Firewall) is an AWS service for monitoring incoming traffic to secure a web application for suspicious activity like SQL injections. Can be attached to an AWS Application LoadBalancer, AWS CloudFront distribution, Amazon API Gateway, and AWS AppSync GraphQL API. In case of finding any request that sits WAF’s rules, it will… Read More: AWS: Web Application Firewall overview, configuration, and its monitoring0 (0) »

Kubernetes: Deployment Strategies types, and Argo Rollouts
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12 July 2021

One of the goals of the ArgoCD implementation in our project is to use new Deployment Strategies for our applications. In this post, we will observe deployment types in Kubernetes, how Deployment is working in Kubernetes and a quick example of the Argo Rollouts. Deployment Strategies and Kubernetes Let’s take a short overview of the… Read More: Kubernetes: Deployment Strategies types, and Argo Rollouts0 (0) »

ArgoCD: declarative Projects, Applications, and ArgoCD deploy from Jenkins
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19 May 2021

An application, cluster, or repository can be created In ArgoCD from its WebUI, CLI, or by writing a Kubernetes manifest that then can be passed to kubectl to create resources. For example, Applications are Kubernetes CustomResources and described in Kubernetes CRD applications.argoproj.io: [simterm] $ kubectl get crd applications.argoproj.io NAME CREATED AT applications.argoproj.io 2020-11-27T15:55:29Z [/simterm] And… Read More: ArgoCD: declarative Projects, Applications, and ArgoCD deploy from Jenkins0 (0) »

ArgoCD: Okta integration, and user groups
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17 May 2021

In the previous post ArgoCD: users, access, and RBAC we’ve checked how to manage users and their permissions in ArgoCD, now let’s add an SSO authentification. The idea is that we don’t add user accounts locally in the ArgoCD’s ConfigMap, but instead will use our Okta users databases and Okta will perform their authentication. And… Read More: ArgoCD: Okta integration, and user groups0 (0) »

ArgoCD: users, access, and RBAC
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17 May 2021

ArgoCD has two types of users – local, that are set in the argocd-cm ConfigMap, and SSO. Below, we will speak about local user management, and in the next chapter will see how to integrate ArgoCD and Okta, because local users can’t be grouped in groups. See the documentation on the Local users/accounts page. For… Read More: ArgoCD: users, access, and RBAC0 (0) »

Kubernetes: spec.ports[0].nodePort: Forbidden: may not be used when `type` is ‘ClusterIP’
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5 May 2021

During applications deploy from a Helm chart described in the Istio: shared Ingress/AWS ALB, Helm chart with conditions, Istio, and ExternalDNS we are getting the “spec.ports[0].nodePort: Forbidden: may not be used when `type` is ‘ClusterIP’” error. Let’s reproduce it and find solutions with kubectl and Helm to solve it. The “spec.ports[0].nodePort: Forbidden: may not be… Read More: Kubernetes: spec.ports[0].nodePort: Forbidden: may not be used when `type` is… »

Istio: shared Ingress/AWS ALB, Helm chart with conditions, Istio, and ExternalDNS
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27 April 2021

Let’s proceed with our journey with Istio. Previous parts: Istio: an overview and running Service Mesh in Kubernetes Istio: external AWS Application LoadBalancer and Istio Ingress Gateway Besides Istio, in this post, we will also configure ExternalDNS, see the Kubernetes: update AWS Route53 DNS from an Ingress for details. Everything described below is a kind… Read More: Istio: shared Ingress/AWS ALB, Helm chart with conditions, Istio, and… »