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: part 3 – AWS EKS overview and manual EKS cluster set up

15 August 2019
 

 Let’s proceed with our Kubernetes journey. Previous parts: Kubernetes: part 1 – architecture and main components overview Kubernetes: part 2 – a cluster set up on AWS with AWS cloud-provider and AWS LoadBalancer In this part we will start working with AWS Elastic Kuberneters Service (EKS) – its short overview, then will create Kubernetes Control… Read More »

Kubernetes: part 2 – a cluster set up on AWS with AWS cloud-provider and AWS LoadBalancer

10 August 2019
 

 In the first part – Kubernetes: part 1 – architecture and main components overview – we did a quick glance about Kubernetes. The next thing I’d like to play with is to manually create a cluster using kubeadm, run a simple web-service there and access it via AWS LoadBalancer. The main issue I faced with… Read More »

AWS RDS: “SQLSTATE[22001] – Data too long for column” using MariaDB 10.2

8 August 2019
 

 We have a PHP-application with the AWS RDS MariaDB as a backend. On the previously used 10.0 version all was good, but right after we upgraded to the MariaDB 10.2 – got errors during tests: PDOException: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column ‘name’ at row 1 in /data/projects/projectname/vendor/yiisoft/yii2/db/Command.php:1290 The first… Read More »

Kubernetes: part 1 – architecture and main components overview

25 July 2019
 

  On my current project for our mobile applications, we have an API-backend on the Yii PHP-framework, which is working now on an ordinary LEMP stack – Linux/NGINX/PHP-FPM/MySQL (AWS EC2 + MariaDB RDS). Eventually, it’s time to break this monolith into microservices which will be orchestrated by the Kubernetes and will be running on the… Read More »

AWS: S3 Cross-Region Replication with DeleteMarkers set up

17 July 2019
 

 At this moment I’m configuring a new CDN for our project. Will use CloudFront and Cloudflare here so need to create two dedicated buckets with different names – cdn.cfr.example.com => CloudFront and cdn.cfl.example.com => Cloudflare. To avoid coping data each time to both buckets – an AWS S3 Cross-Region Replication can be used, so data… Read More »

SonarQube: running tests from Jenkins Pipeline in Docker

18 June 2019
 

 The task is to run our backend PHP tests using SonarQube from a jenkins Pipeline job. Jenkins running in Docker and all its builds also uses Docker. The main issue I faced during this setup was the fact that SonarQube’s container inside spawns another process with Elastisearch (while Docker concept says “1 service per one… Read More »

AWS: IAM users keys rotation, EC2 IAM Roles and Jenkins

30 May 2019
 

 Today I checked our IAM-users and “suddenly” recalled that it’s good to update their credentials sometimes: Well, that’s good to do but here is a question: it’s simple enough to set an expire for keys in IAM, but what to do with all scripts which are used in our Jenkins and which are using those… Read More »

Debian: unattended-upgrades – automatic upgrades installation with email notifications via AWS SES

23 May 2019
 

 A unattended-upgrades package performs automated upgrades installation on Debian/Ubuntu systems. It’s a Python script (1500 lines) located at /usr/bin/unattended-upgrade (and /usr/bin/unattended-upgrades is a symlink to the /usr/bin/unattended-upgrade). CentsOS/RHEL analog – yum-cron. Install it: The main config file is /etc/apt/apt.conf.d/50unattended-upgrades where upgrade types, email settings etc can be configured. Upgrades related schedules are done in the… Read More »

AWS: VPC peering DNS resolution and DNS settings for OpenVPN Access Server

17 May 2019
 

 We have a VPC with OpenVPN Access Server running. This VPC is connected with other VPCs in our AWS account. The issue is that currently when a user is connected to VPN for the DNS resolution into EC2 instances private IPswe are using dnsmasq service on the VPN-host which has a /etc/dnsmasq.hosts file where are manually… Read More »