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.

Kubernetes: Minikube, and a LoadBalancer in the Pending status

5 October 2022
 

  After running Pritunl in Minikube, it is not possible to connect to the VPN: … 2022-10-03 13:50:32 TCP/UDP: Preserving recently used remote address: [AF_INET]194.168.3.100:1194 2022-10-03 13:50:32 UDP link local: (not bound) 2022-10-03 13:50:32 UDP link remote: [AF_INET]194.168.3.100:1194 … Check its Kubernetes Service: [simterm] $ kubectl -n pritunl-local get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S)… Read More »

PostgreSQL: PostgreSQL Operator for Kubernetes, and its Prometheus monitoring

23 September 2022
 

  So, we’ve launched Druid, see Apache Druid: Overview, Running in Kubernetes, and Monitoring with Prometheus . So far, a local Apache Derby database is used as the default storage for metadata . Next, we will switch Druid to PostgreSQL, and later we will remove ZooKeeper from the cluster setup. To begin with, let’s start a PostgreSQL cluster in Kubernetes,… Read More »

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

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 »

AWS: VPC Flow Logs – an overview and example with CloudWatch Logs Insights

19 July 2022
 

  AWS VPC Flow Logs allow you to log traffic information between network interfaces in a VPC. Further, these logs can be stored in AWS S3 or sent to AWS CloudWatch Logs, while enabling traffic logging does not affect the performance of the network interface in any way. Let’s briefly review the basic concepts, and… Read More »

AWS: Trusted Advisor, part 2 – CloudWatch Alarms and Slack notifications

29 November 2021
 

 Continuing with the theme of the AWS Trusted Advisor service, let’s see how can we configure notifications about new findings. The first part: AWS: Trusted Advisor, part 1 – its features overview. To have notifications, we can use Trusted Advisor metrics from the CloudWatch, see their list on the Trusted Advisor metrics and dimensions page.… Read More »

AWS: Trusted Advisor, part 1 – its features overview

29 November 2021
 

 AWS Trusted Advisor is another service that allows monitoring your accountant its resources in use for their cost-effectiveness, performance, security, and more. Keep in mind, that Trusted Advisor’s checks that are available for you depend on the AWS Support Plan of your account. вашего аккаунта. Fortunately, we have Premium so I’m able to how all… Read More »

AWS: Console – The Dark theme

23 November 2021
 

 The feature is not in production yet (maybe, will be announced on the re:Invent-2021?), but it already can be used via the browser’s Developer Tools. So, open the Developer Tools (F12), and open AWS Console, in the Dev Tools switch to the Application tab, on the left side in the Storage open Cookies: In the… Read More »

AWS: Cost optimization – services expenses overview and traffic costs in AWS

3 November 2021
 

 Let’s proceed with our journey on AWS Cost Optimization topics. Previous parts – AWS: Cost Explorer – costs checking on the CloudWatch Logs example and AWS: cost optimization – purchasing RDS Reserved Instances. One of the shortcomings of the cloud-based architecture is the fact, that it can cost much more than when using own bare-metal… Read More »

AWS: Lambda – copy EC2 tags to its EBS, part 2 – create a Lambda function

13 October 2021
 

 let’s proceed in our journey of the AWS Lambda function, which will copy an EC2’s AWS Tags to all EBS volumes, attached to it. In the first part, AWS: Lambda — copy EC2 tags to its EBS, part 1 – Python and boto3, we wrote a Python script that can get all EC2 instances in… Read More »

AWS: Lambda – copy EC2 tags to its EBS, part 1 – Python and boto3

13 October 2021
 

 We have an AWS Elastic Kubernetes Service cluster, which has a few WorkerNode Groups that were created as AWS AutoScaling Groups by using the eksctl, see the AWS Elastic Kubernetes Service: a cluster creation automation, part 2 – Ansible, eksctl for more details. The WorkerNode Group configuration for the eksctl keeps a set of Tags,… Read More »