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.

AWS Elastic Kubernetes Service: running ALB Ingress controller
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21 April 2020

AWS ALB Ingress Controller for Kubernetes – is a Kubernetes controller which actually controls AWS Application Load Balancers (ALB) in an AWS account when an Ingress resource with the kubernetes.io/ingress.class: alb annotation is created in a Kubernetes cluster. This Ingress resource in its turn describes an ALB Listeners configuration with SSL termination or traffic routing… Read More »

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Kubernetes: part 5 — RBAC authorization with a Role and RoleBinding example
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26 March 2020

The next task is to add a new user who will have access to check pods state and watch logs – any other operations must be prohibited. AWS EKS uses AWS IAM for authentification in a Kubernetes cluster (check the Kubernetes: part 4 – AWS EKS authentification, aws-iam-authenticator and AWS IAM post for details), bot… Read More »

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AWS: CloudFormation – Nested Stacks and stacks parameters Import/Export
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29 February 2020

Nested Stacks in AWS CloudFormation are stacks, created from another, a “parent”, stack using AWS::CloudFormation::Stack. The main idea behind the Nested Stacks is to avoid writing superfluous code and to make templates reusable. Instead, a template is created only once, stored in an S3 bucket, and during stacks creation – you just refer to it.… Read More »

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Linux: PHP-FPM, Docker, STDOUT and STDERR – no an application’s error logs
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24 February 2020

We have a Docker image with NGINX, PHP-FPM, and Supervisor. In the same image, we have our PHP application included, which outputs its errors to the /dev/stderr as per its php.ini file: … [global] error_log=/dev/stderr … The problem is, that if run kubectl logs –  there will be no error output from the application. So,… Read More »

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Kubernetes: running metrics-server in AWS EKS for a Kubernetes Pod AutoScaler
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15 February 2020

Assuming, we already have an AWS EKS cluster with worker nodes. In this post – we will connect to a newly created cluster, will create a test deployment with an HPA – Kubernetes Horizontal Pod AutoScaler and will try to get information about resources usage using kubectl top. Kubernetes cluster Create a test cluster using… Read More »

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Debian: php7.3-curl : Depends: libcurl3 (>= 7.44.0) but it is not installable
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23 January 2020

We have a Jenkins job that runs a Docker container to build a PHP-application based on the Yii framework. Suddenly during the build, we got an error: … Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required… Read More »

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Nextcloud: running in Docker Compose on Debian with Let’s Encrypt SSL
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30 November 2019

I while ago I’d tested the Nextcloud, see the NextCloud: installing server on Debian behind NGINX with PHP-FPM and client on Arch Linux post. In general, it looks good, so it’s time to try to run in a production environment and finally migrate from Dropbox to it. Today, let’s spin up a Nextcloud instance using… Read More »

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AWS: RDS Certificate Authority SSL certificate upgrade
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22 November 2019

We started receiving emails from AWS with notifications to update RDS Certificate Authority certificates. It’s time to do it, so let’s start from our Dev, then will repeat on Staging and Production environments. W eare using common AWS RDS MariaDB instances, and the upgrade documentation is available here>>>. The process itself is really simple and… Read More »

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