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Category Archives: Software
Basic kubernetes infrastructure: RPM and container repo
As part of migrating all the stuff I have from virtual machines to a kubernetes infrastructure, some important pieces of infrastructure are needed. These are: RPM repository: I use custom RPM repositories for setting up virtual machines. These same RPMs … Continue reading
Posted in Devops/Linux
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Automatic certificate renewal with Let’s Encrypt and DnsMadeEasy on Kubernetes
These days, it is ill-advised to run a website (such as this one), over HTTP, even if there is no security risk at all. When hosting your website on HTTP, users will see a warning triangle in the address bar … Continue reading
Posted in Devops/Linux
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Hosting services on Google Kubernetes Engine
This post explains how to host services on Google Compute Engine, parts of this are applicable to regular (non-GKE) Kubernetes clusters as well. This post will cover: allowing multiple services to be deployed in different namespaces allowing multiple (sub)domains to … Continue reading
Posted in Devops/Linux
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Setting up up a deep learning box
After doing a number of courses on machine learning I now have some overview of what is available and how it all works. So now it is getting time to start doing some work from start to finish myself. To … Continue reading
Posted in Data Science, Devops/Linux, Fun, Software
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Why finalizers are really bad
It is more or less common knowledge that using finalize functions in java is bad. For one, you are depending on garbage collection for cleanup and there is no guarantee when the finalizer will be called. Further there is also … Continue reading
Posted in Java
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Encrypting an existing Centos install (2)
In a previous post, I described how to encrypt an existing Centos install that approach was based on find out how LUKS worked and then creating a storage logical volume that was encrypted with then logical volumes on top of … Continue reading
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Encrypting an existing Centos install
Edit: Meanwhile I have found a better way to migrate an existing centos unencrypted install to a fully encrypted install with /boot as the only unencrypted disk space. This solution is much preferred over the one described in this post. … Continue reading
Posted in Devops/Linux, Java, Software
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Creating a USB install for Centos 6.4
The days of rotating disks for storing information and in particular for installing OSes are nearing their end. Why rely on something with rotating parts for storing data in the 21st century? Unfortunately, not every software vendor has caught up … Continue reading
Posted in Devops/Linux, Software
4 Comments
Java from the trenches: improving reliability
Java and the JVM are great things. In contrast to writing native code, making a mistake in your Java code will not (or should not) crash the virtual machine. However, in my new position working for a SAAS company I … Continue reading
Posted in Devops/Linux, Java, Software
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Why do developers write instead of reuse?
I am frequently amazed at the amount of software that is being written instead of simply looking around and reusing what’s already available. In practice I have seen a lot of reasons for this: Our problems are unique: The misconception … Continue reading
Posted in Software
2 Comments