Journey of an IT Architect

  • AWS CDK example in Python – provision Kubernetes Nodes

    There are two mechanisms to initialize instances in AWS. Cloud init and CloudFormation Init. Both are widely used and we discuss each of them in…

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  • IPVS, iptables and kube-proxy

    This is an overview of the underlying technologies that drives load balancing. It covers LVS, Netfilter, iptables, IPVS and eventually kube-proxy. LVS (Linux Virtual Server)…

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  • How imaging devices talk to each other (in DICOM)

    Overview In the previous post I briefly touched on DICOM as the crucial standard in medical imaging for both data exchanging and data storage. It…

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  • Automatic deployment of Orthanc on AWS

    [Update] I changed reverse proxy from Nginx to Envoy. Here‘s the detail. [Update] Some security improvement was introduced in may 2021. Here‘s detail. [Update] Here’s…

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  • Docker storage

    Microservices are all about stateless and ephemeral workloads, and containers are great microservices. This may suggest that that Docker is all about ephemeral storage. In…

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  • Docker components

    The previous post about virtualization and containerization brought up some underlying technologies which Docker build containers on, including: In this post we further discuss the…

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