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  • Thumbnail for Firewall Deployment Patterns

    Firewall Deployment Patterns

    The Hub-and-Spoke topology is the most common topic in the discussion for building cloud infrastructure design. This topology appeared in both AWS and Azure design…

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  • Thumbnail for WordPress Security Basics

    WordPress Security Basics

    Background In 2019, I moved this site to WordPress hosted on an Amazon Lightsail instance. There were few visits at that time so I lived…

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  • Thumbnail for Connect kubectl to private Kubernetes cluster in EKS and AKS

    Connect kubectl to private Kubernetes cluster in EKS and AKS

    Managed Kubernetes services give user a cluster endpoint and a number of worker nodes, with the choice. For each access, users have the choice of…

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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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  • Redhat Firewall configuration: from iptables to firewalld

    Tools to manage firewall Packet filter rules in Linux Kernel is managed by an user-space application named iptables in CentOS and RedHat. Since CentOS 7,…

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