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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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  • 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 Terms in 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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  • CentOS – Remove Swap safely

    If the default installation has swap on, you will see it from block device list: Many installations require swap to be off for performance reasons…

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  • TCPdump and Wireshark configuration

    This article explains how to troubleshoot TCP packet from Linux (CentOS) and Windows with TCP dump and wireshark. Both are important tools for troubleshooting. If…

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  • Linux Admin Basics 1 of 3 – Bash

    This article summarized my time-saving Linux tips, mostly with CentOS environment. Bash Shortcuts These shortcuts save a lot of arrow keystrokes. Some of them may…

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