Category Archives: Docker

Docker is a computer program that performs operating-system-level virtualization, also known as “containerization”.

Istio: an overview and running Service Mesh in Kubernetes
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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: Istio: an overview and running Service Mesh in Kubernetes0 (0) »

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

Jenkins: running workers in Kubernetes and Docker images build
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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: Jenkins: running workers in Kubernetes and Docker images build0 (0) »

Kubernetes: NGINX/PHP-FPM graceful shutdown and 502 errors
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25 February 2021

We have a PHP application running with Kubernetes in pods with two dedicated containers – NGINX и PHP-FPM. The problem is that during downscaling clients get 502 errors. E.g. when a pod is stopping, its containers can not correctly close existing connections. So, in this post, we will take a closer look at the pods’… Read More: Kubernetes: NGINX/PHP-FPM graceful shutdown and 502 errors0 (0) »

AWS Elastic Kubernetes Service: load-testing and high-load tuning – problems and solutions
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4 September 2020

Actually, this post was planned as a short note about using NodeAffinity for Kubernetes Pod: But then, as often happens, after starting writing about one thing, I faced another, and then another one, and as a result – I made this long-read post about Kubernetes load-testing. So, I’ve started about NodeAffinity, but then wondered how… Read More: AWS Elastic Kubernetes Service: load-testing and high-load tuning – problems… »

Neo4j: running in Kubernetes
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5 August 2020

In the previous post – Neo4j: graph database – run with Docker and Cypher QL examples – we’ve run the Neo4j database with в Docker. The next task is to run it in the Kubernetes cluster. Will use the Neo4j Community Edition, which will be running as a single-node instance as cluster ability for the… Read More: Neo4j: running in Kubernetes0 (0) »

Neo4j: graph database – run with Docker and Cypher QL examples
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28 July 2020

In contrast to the RDMS (Relational Database Management System), where data objects are the main part, in a Graph Database, the relations between such data objects are playing the main role and are represented as dedicated objects which gives better performance especially when you have a lot of small data pieces tied to each other.… Read More: Neo4j: graph database – run with Docker and Cypher QL… »

Docker: configure tzdata and timezone during build
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17 May 2020

During a Docker image build – it stops asking to configure the tzdata. Dockerfile at this moment is the next: FROM ubuntu:18.04 RUN apt update && apt install -y python-pip python-dev ssh python-boto3 RUN pip install ansible==2.4.3.0 Let’s reproduce – run the build: [simterm] admin@jenkins-production:~$ docker build -t proj/proj-ansible:1.1 . Sending build context to Docker… Read More: Docker: configure tzdata and timezone during build0 (0) »

Helm: helm-secrets – sensitive data encryption with AWS KMS and use it with Jenkins
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16 May 2020

So, as a follow-up to the Helm: Kubernetes package manager – an overview, getting started post – let’s discuss about sensitive data in our Helm charts. What I want is to store a chart files in a repository, but even if such a repo will be a private Github repo – I still don’t want… Read More: Helm: helm-secrets – sensitive data encryption with AWS KMS and… »

AWS Elastic Kubernetes Service: a cluster creation automation, part 2 – Ansible, eksctl
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1 May 2020

The first part – AWS Elastic Kubernetes Service: a cluster creation automation, part 1 – CloudFormation. To remind the whole idea is to create an automation process to create an EKS cluster: Ansible uses the cloudformation module to create an infrastructure by using an Outputs of the CloudFormation stack created – Ansible from a template will… Read More: AWS Elastic Kubernetes Service: a cluster creation automation, part 2… »