Category Archives: Virtualization

In computing, virtualization refers to the act of creating a virtual version of something, including virtual computer hardware platforms, storage devices, and computer network resources.

Istio: an overview and running Service Mesh in Kubernetes

11 April 2021

 Istio is a Service Mesh solution that allows performing Service Discovery, Load Balancing, traffic control, canary rollouts and blue-green deployments, traffic monitoring between microservices. We will use Istio in our AWS Elastic Kubernetes Service for traffic monitoring, as an API Gateway service, for traffic policies, and for various deployment strategies. In this post, will speak… Read More »

Kubernetes: ExternalDNS – records retrieval failed: failed to list hosted zones: Throttling: status code: 400

9 April 2021

 We have an ExternalDNS service running, see the Kubernetes: update AWS Route53 DNS from an Ingress post, which started sending a lot of messages like: msg=”failed to list resource records sets for zone /hostedzone/Z2VM3W5SRY4I9J: Throttling: \n\tstatus code: 400 And even AWS Console in the Route53 says “Throttling error that was caused because API rate was… Read More »

Kubernetes: namespace hangs in Terminating and metrics-server non-obviousness

1 April 2021

 Faced with a very interesting thing during removal of a Kubernetes Namespace. After a kubectl delete namespace NAMESPACE is executed, the namespace hangs in the Terminating state, and any attempt to forcibly remove it didn’t help. First, let’s see how such a force-removal can be done, and then will check the real cause and a… Read More »

Opsgenie: integration with AWS RDS and alerting

18 March 2021

 Let’s configure Opsgenie with AWS RDS. The idea is to get notifications from RDS about events and send them to Opsgenie which will send them to our Slack. To do so, we need to configure AWS Simple Notification Service and AWS RDS Event subscriptions. The official documentation is here>>>. Opsgenie confiuration Go to the Integrations… Read More »

Windows: Windows Subsystem for Linux and Ubuntu Linux installation

14 March 2021

  Windows Subsystem for Linux (WSL) is a Windows subsystem that helps to run various Linux distribution directly from the Windows OS. WSL version 2 which is the default version now uses the Hyper-V virtualization under the hood to install and run Linux and share files and devices between both systems. Windows Subsystem for Linux… Read More »

Kubernetes: what is Endpoints

13 March 2021

 Usually, we don’t see Endpoints objects when using Kubernetes Services, as they are working under the hood, similarly to ReplicaSets which are “hidden” behind Kubernetes Deployments. Kubernetes Service So, Service is a Kubernetes abstraction that uses labels to chose pods to route traffic to, see the Kubernetes: ClusterIP vs NodePort vs LoadBalancer, Services, and Ingress… Read More »

AWS: InvalidSignatureException: Signature not yet current and Kubernetes AWS ALB Ingress controller

4 March 2021

 One day our developers said that they can not create new AWS LoadBalancers via Ingress on our Kubernetes Dev cluster (AWS EKS). Balancers are created using AWS ALB Controller, see AWS Elastic Kubernetes Service: running ALB Ingress controller. Errors in the controller’s logs were: E0304 07:12:38.595113       1 controller.go:217] kubebuilder/controller “msg”=”Reconciler error” “error”=”no object matching key… Read More »

Jenkins: running workers in Kubernetes and Docker images build

27 February 2021

 We have a Jenkins instance that is running jobs in Docker containers on its host. Eventually, we’ve faced with an issue when the current AWS Ec2 instance t2.2xlarge (8 CPU, 32 RAM) during peak workload periods was too overloaded – not enough CPU time, not enough memory. So, the first solution could be to proceed… Read More »