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  • How memory usage adds up in Linux

    There are too many metrics that describes some aspects about memory in Linux. This posting will make sense of those common metrics in Linux, CentOS…

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  • Introduction to Authentication Frameworks (PAM and SSPI)

    This article gives a very brief high-level introduction to PAM (Pluggable Authentication Module) and SSPI (Security Support Provider Interface) as authentication frameworks in Linux and…

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  • High Availability and Load Balancer

    Overview Fault tolerance and high availability are two architectural characteristics that people often confuse with each other. High availability focuses on minimizing downtime. It guarantees…

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  • Nginx as a reverse proxy for Nifi web UI and Kibana

    Nginx can act as a application neutral proxy. One example is to front Nifi. The nifi default configuration provides an HTTP access point, specified in…

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  • Personal Vim cheatsheet

    This is my personal cheatsheet as intermediate Vim user so I skipped the ones that I consider basic. All the commands listed are used in…

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  • AWS Certified DevOps Engineer Exam Tips

    The last 30 days have been exhausting for me. I studied hard on the new AWS Certified DevOps Engineer exam and thank goodness I passed…

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