Journey of an IT Architect

  • Log shipping through ELK

    A common devops task is build logging pipeline with ELK stack (Elasticsearch, Logstash, Kibana). Suppose the application is written in Java and currently use log4j’s…

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  • A review of vSphere virtualization technologies

    This post is a summary of VMware’s white paper Introduction to VMware vSphere. ESXi is the hypervisor (virtualization layer) on bare metal servers that abstracts…

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  • DICOM data encoding

    DICOM is a standard for medical imaging exchanges, originally in radiology, but later expanded into other departments where mass imaging data are acquired, such as…

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  • Linux Admin Basics 3 of 3 – text processing, regex, sed & awk

    Most of the text processing can be processed by awk and sed. Sed is non-interactive stream editor that allows you to specify all editing instructions…

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  • cron and anacron in RedHat Linux (How logrotate works)

    Cron and anacron We all know cron is a job scheduler. Many admin uses crontab to manage scheduled task. It is also important to know…

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  • Basics of Linux OS

    These are the things quite confusing or abstract while I was at school but now makes lots of sense after many years working with different…

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