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Docker, WebLogic Image on Oracle Container Cloud Service

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Oracle licenses and the cloud

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Is RHCSA still relevant when you use the cloud?

Frederique Retsema June 13, 2022
Is RHCSA still relevant when you use the cloud?

Last week I passed for my RHCSA exam (EX200) [1]. While I was studying for the exam, I asked myself which parts of this exam are still relevant when you use Linux servers and Linux containers in the cloud and which parts are not. Assumptions In the cloud, we prefer: […]

  • Docker
  • Software Development

Creating a minimal container image for a Go application

Lucas Jellema May 3, 2022
Creating a minimal container image for a Go application

How hard can it be – to create the smallest possible container image to run a Go application? It is not hard to create a container image that contains an binary executable file – and that is what a Go application turns into during the build process. However, that does […]

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AMIS DataSafe, the answer to Black Swan scenarios

Jeroen Gouma March 29, 2022
AMIS DataSafe, the answer to Black Swan scenarios

How to be prepared for a black swan scenario?

  • Development Tools
  • Featured
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  • Virtualization and Oracle VM

Vagrant and Hyper-V: Don’t do it!

Maarten Smeets February 28, 2022
Vagrant and Hyper-V: Don’t do it!

I’ve used Vagrant since 2015 in combination with Virtualbox for creating development machines. Recently however I’m experiencing more issues with Virtualbox. For example CPUs getting stuck when assigning multiple CPUs to a VM and issues with auto adjusting the guest resolution when resizing the VM window. These annoyances drove me […]

  • Kubernetes
  • Technology

Dapr on OKE–Distributed Application Runtime on OCI Kubernetes Engine

Lucas Jellema December 17, 2021
Dapr on OKE–Distributed Application Runtime on OCI Kubernetes Engine

One of the most exciting frameworks I have ran into into recent years is Dapr (dapr.io) – distributed application runtime. Dapr is a cross technology runtime framework that supports applications in many and The Dapr docs describe how to install Dapr locally and on a Kubernetes cluster. The documentation explicitly […]

  • Cloud
  • Kubernetes

Getting started (again) with Kubernetes on Oracle Cloud

Lucas Jellema December 12, 2021
Getting started (again) with Kubernetes on Oracle Cloud

For many of my recent activities, I have not worked with or even on (knowingly at least) Kubernetes. So for many months I have not touched my OKE cluster on Oracle Cloud. However, in the last weeks, I have run into so many interesting things to dive into – that […]

  • Cloud
  • Containers
  • Deployment
  • Docker
  • Microsoft Azure Cloud
  • Python
  • Recent
  • Software Engineering
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Continuous Generation and Publication of Docstring Documentation on Azure – using Sphinx, Pydoc, Storage Account and App Service

Sam Vruggink August 17, 2021
Continuous Generation and Publication of Docstring Documentation on Azure – using Sphinx, Pydoc, Storage Account and App Service

In this blog I will explain how to generate static HTML pages from your projects Pydoc (docstring) comments with Sphinx. Then we are going to host it in an Azure Web App so that everyone in your team is able to access it. Because we use a Storage Mount, when […]

  • Docker
  • Tools

How to run Jenkins with Chrome from a Docker container

Emmy Hermans July 20, 2021
How to run Jenkins with Chrome from a Docker container

In this blog I will show you how to run a Jenkins agent that can use chrome from a docker container. The Dockerfile and docker-compose.yml file are explained in this article.

  • Licensing
  • Oracle
  • Technology
  • Virtualization and Oracle VM

Migrate Oracle VM to KVM easily and without reconfiguration

Roderick Christ June 21, 2021
Migrate Oracle VM to KVM easily and without reconfiguration

Oracle VM is end-of-life and is, since March 2021, in extended support1. In looking for a replacement hypervisor AMIS has turned to KVM. Oracle itself also uses KVM, albeit its own brand of KVM, OLKVM, in Oracle Cloud and on the new versions of its Oracle Database Appliance. Topped with […]

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  • Microsoft Azure Cloud
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Check for RunAs accounts in Automation Accounts

Frederique Retsema May 14, 2021 1
Check for RunAs accounts in Automation Accounts

Introduction Some time ago, I wrote about the new preview feature in Azure Automation Accounts to use Managed Identities [1]. I think that it is useful to migrate to this new feature as soon as possible: managed identities are used in many places in Azure and it is better to […]

  • Microsoft Azure Cloud
  • Platform Technology
  • Security

VNet peering in Azure

Frederique Retsema February 14, 2021
VNet peering in Azure

Introduction I looked into virtual network peering peering in Azure and I saw something that looked rather strange to me. Let me explain what it was, how VNet peering works and what you should be aware of from a security perspective. Situation I have two virtual networks: one for 10.1.0.0/16 […]

  • Architecture
  • AWS
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  • Serverless

Using one-time upload URLs in AWS with S3 versioning

Frederique Retsema January 26, 2021
Using one-time upload URLs in AWS with S3 versioning

In this blog, I will show how you can use the SAM (Serverless Application Model) to get a presigned upload URL to AWS S3 that can be used exactly once [1]. In AWS it is possible to use a presigned URL to upload files, but the URL is valid for […]

  • Architecture
  • AWS
  • Platform Technology
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  • Serverless

Using one-time upload URLs in AWS with Memcached

Frederique Retsema January 23, 2021
Using one-time upload URLs in AWS with Memcached

In this blog I will show how you can use the SAM (Serverless Application Model) to get a presigned upload URL to AWS S3 that can be used exactly once [1]. In AWS it is possible to use a presigned URL to upload files, but the URL is valid for […]

  • Architecture
  • AWS
  • Platform Technology
  • Security
  • Serverless

Using one-time upload URLs in AWS using DynamoDB

Frederique Retsema January 20, 2021
Using one-time upload URLs in AWS using DynamoDB

In this blog, I will show how you can use the SAM (Serverless Application Model) to get a presigned upload URL to AWS S3 that can be used exactly once [1]. In AWS it is possible to use a presigned URL to upload files where the URL is valid for […]

  • Architecture
  • AWS
  • Platform Technology
  • Serverless

AWS Lambda: shared libraries (and SAM)

Frederique Retsema November 28, 2020
AWS Lambda: shared libraries (and SAM)

In June I wrote a blog series about the AWS Shop Example. In this series, I also wrote about X-Ray [1]. I like X-Ray: you can see how much time each step in a whole concattenation of AWS services takes and how much time it costs to send the response […]

  • AWS
  • Platform Technology

AWS blog series part 6: speed up the use of the ELB Health Status

Frederique Retsema November 18, 2020
AWS blog series part 6: speed up the use of the ELB Health Status

It took me a while, but then this blog series was ready: five blog articles about Windows Failover Clustering and Auto Scaling Groups with one node. I was happy, but then a thought was nagging me. Let me explain the problem by showing you the results for the Auto Scaling […]

  • Architecture
  • AWS
  • Platform Technology

AWS blog series part 5: Start PowerShell script after a reboot when Windows fails to do so

Frederique Retsema November 15, 2020
AWS blog series part 5: Start PowerShell script after a reboot when Windows fails to do so

You might have wondered in the second blog of this series [1], why I mentioned the possibility that the Task Scheduler didn’t start after a reboot in the “on-premise” (Hyper-V) environment, but I didn’t do so in the AWS environment. Well, that’s because I used a “trick”, where AWS will […]

  • Architecture
  • AWS
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Windows Failover Cluster on AWS part 4: Construction of the CloudFormation scripts

Frederique Retsema November 14, 2020
Windows Failover Cluster on AWS part 4: Construction of the CloudFormation scripts

Introduction If you follow along in this blog series [1], I can imagine that if you deployed the CloudFormation scripts, that you think “wow, how does it work”. In this blog, I try to answer that question. 1. Windows Failover Clustering Nested stacks When you start the CloudFormationFailover.yml script, you […]

  • Architecture
  • AWS
  • Cloud
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AWS Migration part 1: how to migrate Windows Failover Clustering servers to AWS?

Frederique Retsema November 7, 2020
AWS Migration part 1: how to migrate Windows Failover Clustering servers to AWS?

Introduction In this series, I will look at the migration from on-premise Windows Failover Clusters to AWS. What is the difference in recovery times between the application on-premise, the 1:1 migration of a Failover Cluster to AWS and the commonly used pattern of an Auto Scaling Group with one node? […]

  • AMIS
  • DBA Oracle
  • Enterprise Manager
  • PL/SQL
  • Platform Technology
  • Tools

How to dynamically Schedule EM Blackouts after PatchTuesday

Karin Kriebisch November 7, 2020
How to dynamically Schedule EM Blackouts after PatchTuesday

In the organization I’m currently working for, the OS-patch schedule depends on PatchTuesday (PT) just as Microsoft, Adobe or Oracle are using. And PatchTuesday is, as you all know, the Second Tuesday of each month. But this is a schedule you can not set in the Oracle Enterprise Manager Scheduler. […]

  • Continuous Delivery
  • Java
  • Kubernetes
  • Security

Jenkins Pipeline: SonarQube and the OWASP Dependency-Check

Maarten Smeets October 16, 2020
Jenkins Pipeline: SonarQube and the OWASP Dependency-Check

The OWASP Foundation plays an important role in helping to improve security of software worldwide. They have created a popular and well-known awareness document called the ‘OWASP Top 10‘. This document lists the following risk: using components with known vulnerabilities. Software nowadays can be quite complex consisting of many direct and […]

  • Java
  • Kubernetes

Quarkus – Supersonic Subatomic Java, trying out Quarkus guide “Quarkus – Kubernetes extension” (part 3)

Marc Lameriks October 10, 2020
Quarkus – Supersonic Subatomic Java, trying out Quarkus guide “Quarkus – Kubernetes extension” (part 3)

In this article, you can read more about the Quarkus code guide I tried out, related to the following topic: The ability to automatically generate Kubernetes resources by Quarkus The guide covers generating and deploying Kubernetes resources based on sane defaults and user supplied configuration. In this article, I will […]

  • Java
  • Kubernetes

Quarkus – Supersonic Subatomic Java, trying out Quarkus guide “Quarkus – Kubernetes extension” (part 2)

Marc Lameriks October 3, 2020
Quarkus – Supersonic Subatomic Java, trying out Quarkus guide “Quarkus – Kubernetes extension” (part 2)

In this article, you can read more about the Quarkus code guide I tried out, related to the following topic: The ability to automatically generate Kubernetes resources by Quarkus The guide covers generating and deploying Kubernetes resources based on sane defaults and user supplied configuration. In this article, I will […]

  • Java
  • Kubernetes

Quarkus – Supersonic Subatomic Java, trying out Quarkus guide “Quarkus – Kubernetes extension” (part 1)

Marc Lameriks September 27, 2020
Quarkus – Supersonic Subatomic Java, trying out Quarkus guide “Quarkus – Kubernetes extension” (part 1)

In this article, you can read more about the Quarkus code guide I tried out, related to the following topic: The ability to automatically generate Kubernetes resources by Quarkus The guide covers generating and deploying Kubernetes resources based on sane defaults and user supplied configuration. In this article, I will […]

  • Containers
  • Deployment
  • Docker
  • Java
  • Kubernetes

Jenkins: Building Java and deploying to Kubernetes

Maarten Smeets September 24, 2020 1
Jenkins: Building Java and deploying to Kubernetes

Kubernetes is a popular platform to run and manage containerized applications. A CI/CD solution is often needed but not always provided. You might need to set this up for yourself. In this blog post I’ll provide a minimal end-to-end solution for Java applications. This starts with a commit in source […]

  • Containers
  • Docker
  • Java

Quarkus – Supersonic Subatomic Java, trying out some Quarkus code guides (part2)

Marc Lameriks September 7, 2020
Quarkus – Supersonic Subatomic Java, trying out some Quarkus code guides (part2)

In this article, you can read more about a Quarkus code guide I tried out, related to the following topic: Packaging the native executable in a container In a next article, you can read more about another Quarkus code guide I tried out, related to the following topic: The ability […]

  • Containers
  • Kubernetes
  • Platform Technology
  • Provisioning

OpenEBS: cStor storage engine on KVM

Maarten Smeets August 1, 2020
OpenEBS: cStor storage engine on KVM

OpenEBS provides a Kubernetes native distributed storage solution which is friendly on developers and administrators. It is completely open source and part of the CNCF. Previously I wrote about installing and using OpenEBS, Jiva storage engine, on the Charmed Kubernetes distribution of Canonical. The Jiva storage class uses storage inside managed […]

  • Containers
  • Kubernetes
  • Platform Technology

Production-like Kubernetes on your laptop. Kubespray on KVM

Maarten Smeets July 31, 2020 3
Production-like Kubernetes on your laptop. Kubespray on KVM

There are various options to install a production-like Kubernetes distribution on your laptop. Previously I tried out using the Canonical stack (Juju, MAAS, Charmed Kubernetes) for this. This worked nicely but it gave me the feeling that it was a bit Canonical specific and it felt a bit heavy on resources at […]

  • AWS
  • Cloud
  • Platform Technology
  • Serverless

AWS Shop example: Amazon X-Ray

Frederique Retsema June 6, 2020
AWS Shop example: Amazon X-Ray

Introduction We are in production with our shop example [1]. We’d like to get some statistics about our implementation: how often are the Lambda functions called? How fast are they? Of course, we could use the statistics from the performance test, but there is a faster way. This faster way […]

  • AWS
  • Cloud
  • Database
  • NoSQL
  • Platform Technology
  • Serverless

AWS Shop example: SNS duplicate messages

Frederique Retsema June 3, 2020
AWS Shop example: SNS duplicate messages

Introduction Our shop example [1] is now in production, wohoo!!! When you are using our example program in production, you might see that some sales are updated multiple times in the database. This will not happen very often, but you want your sales to be processed once, not twice. In […]

  • AWS
  • Cloud
  • Platform Technology
  • Serverless
  • Testing

AWS Shop example: step functions

Frederique Retsema May 31, 2020
AWS Shop example: step functions

Introduction When you follow along in this series [1], you might have been irritated by the amount of work to test your functions. It isn’t a problem to test only the unit test for the accept function, but when you have to test the unit test for the decrypt function, […]

  • Continuous Delivery
  • Kubernetes
  • Provisioning

OpenEBS: Create persistent storage in your Charmed Kubernetes cluster quick and easy!

Maarten Smeets May 22, 2020
OpenEBS: Create persistent storage in your Charmed Kubernetes cluster quick and easy!

As a developer I wanted to experiment with Kubernetes environments which approximate production deployments. In order to do that I wanted a distributed storage solution and chose OpenEBS. Mainly because it was easy to get started and quick to get up and running. In this blog post I’ll describe how […]

  • Architecture
  • AWS
  • Cloud
  • Platform Technology
  • Serverless

AWS Shop example: unit tests

Frederique Retsema May 21, 2020
AWS Shop example: unit tests

Introduction In the last six blogs [1], I showed you an application that used AWS to process the sales from a cashing machine. This series continues with tests for this application. Some objects of our solution cannot be tested: we cannot test the API gateway, the SNS topics or DynamoDB […]

  • Kubernetes
  • Provisioning

Charmed Kubernetes on KVM using MAAS and Juju

Maarten Smeets May 20, 2020 3
Charmed Kubernetes on KVM using MAAS and Juju

Coming to this solution was a journey. I was looking for a Kubernetes installation which was easy to deploy and cleanup on my own laptop (I didn’t want to have to pay for a hosted solution). I did want a solution which was more or less production-like because I wanted […]

  • Architecture
  • AWS
  • Platform Technology
  • Serverless

AWS Shop example: the API Gateway (1)

Frederique Retsema May 9, 2020
AWS Shop example: the API Gateway (1)

Introduction You might have noticed that we skipped the API Gateway up to now [1]. I will write two blogs about the API Gateway. In this one, we follow the simplest route: from sending the message to the API gateway, and let the API Gateway deliver the message at the […]

  • Databases
  • Dataguard
  • DBA Oracle
  • Oracle 12

Migrating databases using Dataguard, some pitfalls and observations

Martijn Pronk May 8, 2020
Migrating databases using Dataguard, some pitfalls and observations

My customer needed to migrate to a new set of datacenters, and while other services were able to “lift and shift”, the Oracle RAC database servers had to be rebuilt in the new datacenter because the underlying platform wasn’t able to migrate the shared disks. Fortunately the environment was already […]

  • Platform Technology

Windows Sandbox with Chocolatey, Scoop, Git, VisualStudio Code and more

Lucas Jellema May 5, 2020
Windows Sandbox with Chocolatey, Scoop, Git, VisualStudio Code and more

I recently wrote an article to introduce Windows Sandbox. I explained how the Sandbox can have folders mapped from the host, have network interactions with the host (and the rest of the world) and use the clipboard for exchanging objects to and from the host. I also mentioned the logon […]

  • Containers
  • Kubernetes

Quick and easy: A multi-node Kubernetes cluster on CentOS 7 + QEMU/KVM (libvirt)

Maarten Smeets April 30, 2020
Quick and easy: A multi-node Kubernetes cluster on CentOS 7 + QEMU/KVM (libvirt)

Kubernetes is a popular container orchestration platform. As a developer understanding the environment in which your application is going to run is important since this can help you use available services of the platform and fix issues. There are several options to run Kubernetes locally to get some experience with […]

  • Platform Technology

Windows Sandbox – light weight playground for R&D, tutorials and workshops

Lucas Jellema April 25, 2020 3
Windows Sandbox – light weight playground for R&D, tutorials and workshops

Windows Sandbox to me is a light weight Windows 10 virtual machine that I can quickly start and stop and use to install and run programs. The Windows Sandbox provides a well defined, clean environment that is fresh every time it is started. Inside the Sandbox, I can create an […]

  • Kubernetes
  • Oracle Cloud

Access OCI OKE Kubernetes Dashboard locally through Cloud Shell Proxy and ngrok

Lucas Jellema March 15, 2020 1
Access OCI OKE Kubernetes Dashboard locally through Cloud Shell Proxy and ngrok

This article tells you how to access the Kubernetes Dashboard on top of an Oracle Cloud Infrastructure OKE Cluster Instance from a browser – without locally installing kubectl. This trick uses OCI Cloud Shell to run kubectl to proxy to the dashboard application running inside the K8S Cluster and it […]

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