Episodes

  • How Linux KSM Is Saving Memory in Virtualized Environments

    How Linux KSM Is Saving Memory in Virtualized Environments
    Jul 4 2026
    Kernel Same-page Merging (KSM) is a Linux kernel feature that deduplicates identical memory pages across processes and virtual machines. In this episode, Lucas and Luna explore how KSM works under the hood, why it's critical for virtualized and containerized workloads, and where it falls short. They walk through a real-world example: a KVM host running 20 Ubuntu VMs that saved over 40 percent of RAM using KSM, based on benchmarks from the Linux Foundation's 2025 virtualization report. Lucas explains the trade-offs — CPU overhead versus memory efficiency — and why KSM is not a silver bullet for every scenario. They also discuss the emerging alternative, UBC (Userspace Block Compiler), and how KSM fits into the broader Linux memory management landscape. A focused, technical conversation for anyone running servers at scale. #Linux #KSM #KernelSamepageMerging #MemoryDeduplication #Virtualization #KVM #QEMU #LinuxKernel #MemoryManagement #Containerization #OpenSource #CloudComputing #DevOps #SysAdmin #Technology #FexingoBusiness #BusinessPodcast #LinuxPodcast Keep every episode free: buymeacoffee.com/fexingo
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    10 mins
  • How Linux Systemd Is Reshaping Service Management

    How Linux Systemd Is Reshaping Service Management
    Jul 4 2026
    In episode 90 of The Linux Podcast, Lucas and Luna dive into systemd - the init system that has become the backbone of modern Linux distributions. They explore why systemd sparked the great Linux civil war, how it unifies service management, logging, and timers into one framework, and what systemd 256 brings with run0 and the new service manager. Specific numbers: nearly 70% of Linux servers now use systemd, and systemd-journald reduces boot time by up to 40% compared to syslog. The hosts discuss practical tradeoffs for sysadmins and the ongoing debate about modularity versus integration. #Linux #Systemd #InitSystem #ServiceManager #LinuxAdministration #OpenSource #Technology #FexingoBusiness #BusinessPodcast #Podcast #Sysadmin #LennartPoettering #RedHat #Ubuntu #Fedora #Debian #Systemd256 #Run0 Keep every episode free: buymeacoffee.com/fexingo
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    9 mins
  • How Linux Uprobes Are Tracing User-Space Applications in Production

    How Linux Uprobes Are Tracing User-Space Applications in Production
    Jul 3 2026
    In this episode, Lucas and Luna dive into Linux uprobes — user-space probes that let engineers trace application code at runtime without recompiling. They explore how uprobes work alongside kprobes, why companies like Netflix use them to debug latency in production microservices, and a concrete example using bpftrace to trace malloc calls in a containerized app. By the end, you'll understand why uprobes are a lightweight alternative to traditional debuggers and how they enable observability in modern distributed systems. This episode is recorded on July 3, 2026, and references real-world use cases from the Linux kernel community. #Linux #Uprobes #UserSpaceProbes #KernelTracing #Observability #BPFtrace #Netflix #PerformanceDebugging #ProductionTracing #Microservices #Technology #OpenSource #LinuxKernel #DynamicTracing #Kprobes #FexingoBusiness #BusinessPodcast #TheLinuxPodcast Keep every episode free: buymeacoffee.com/fexingo
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    11 mins
  • How Linux Btrfs Is Evolving Beyond Traditional Filesystems

    How Linux Btrfs Is Evolving Beyond Traditional Filesystems
    Jul 3 2026
    Episode 88 of The Linux Podcast dives into Btrfs, the copy-on-write filesystem that's been a controversial part of the Linux kernel for over a decade. Lucas and Luna explore how Btrfs has quietly evolved from a risky experimental option into a mature, feature-rich choice for both desktops and servers. They discuss its native compression, snapshot capabilities, and self-healing via checksums, and compare it to traditional filesystems like ext4 and modern alternatives like ZFS on Linux. Lucas shares a real-world case study of a media company that uses Btrfs snapshots to roll back failed updates across 200 servers in under a minute. The episode also touches on Btrfs's RAID support, performance trade-offs, and why Red Hat's decision to deprecate it in RHEL 8 doesn't mean the filesystem is dead. If you've ever wondered whether Btrfs is ready for production, this episode gives you the specifics to decide. #Btrfs #LinuxFilesystem #CopyOnWrite #LucasAndLuna #FexingoBusiness #BusinessPodcast #OpenSource #LinuxKernel #FileSystems #ext4 #ZFS #Snapshots #DataIntegrity #Compression #RAID #RHEL #MediaProduction #Technology Keep every episode free: buymeacoffee.com/fexingo
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    8 mins
  • How Linux Cilium Is Transforming Kubernetes Networking

    How Linux Cilium Is Transforming Kubernetes Networking
    Jul 2 2026
    Episode 87 of The Linux Podcast explores Cilium, the open-source CNI plugin that uses eBPF to replace legacy kube-proxy and iptables-based networking. Lucas and Luna break down how Cilium attaches eBPF programs directly to the network interface to enforce security policies, load-balance service traffic, and provide observability without sidecars. They discuss a real-world migration at a mid-sized fintech that cut latency by 40% and reduced pod startup time from 8 seconds to under 1 second. The hosts explain the Hubble observability layer, Cilium's integration with Kubernetes NetworkPolicy, and why the Cloud Native Computing Foundation recently promoted Cilium to graduated status. They also touch on the trade-offs: initial complexity, the need for kernel 5.10+, and the learning curve for ops teams. The episode closes with a practical verdict on when Cilium makes sense versus simpler CNIs like Flannel or Calico. #Cilium #eBPF #Kubernetes #CNI #Linux #Networking #CloudNative #CNCF #Hubble #ServiceMesh #kubeproxy #NetworkPolicy #Observability #Containers #DevOps #Technology #FexingoTechnology #TechnologyPodcast Keep every episode free: buymeacoffee.com/fexingo
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    9 mins
  • How Linux Overlay Filesystems Are Powering Container Layers

    How Linux Overlay Filesystems Are Powering Container Layers
    Jul 2 2026
    In this episode of The Linux Podcast with Fexingo, Lucas and Luna dive into the overlay filesystem — the unsung hero behind Docker and container image layers. They break down how overlayfs merges multiple directories into a single view, enabling efficient copy-on-write, small image sizes, and instant container startup. Lucas explains the mechanics of lowerdir, upperdir, and mergerdir, using a concrete example of a 500 MB base image with a 50 MB application layer. Luna asks how this differs from union mounts like aufs, and they discuss why overlayfs won out in the Linux kernel. The conversation also touches on performance trade-offs, use cases beyond containers, and why understanding overlayfs helps sysadmins debug storage issues. If today's tech conversation gave you something usable, consider supporting the ad-free mission at buy me a coffee dot com slash fexingo. #Linux #OverlayFilesystem #OverlayFS #Containers #Docker #ContainerImages #CopyOnWrite #UnionMounts #AUFS #Kernel #Sysadmin #DevOps #Storage #Podman #ContainerLayers #Technology #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo
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    9 mins
  • How Linux Control Groups Are Taming Memory Bloat in Containers

    How Linux Control Groups Are Taming Memory Bloat in Containers
    Jul 1 2026
    Lucas and Luna dive into one of the most underappreciated yet critical subsystems in modern Linux: control groups, version 2. They explore how cgroupsv2 is being used by companies like Google and Meta to limit memory usage inside containers, preventing noisy-neighbor problems in multi-tenant environments. Lucas explains the difference between cgroupsv1 and v2, the role of the cgroup memory controller, and how memory.high and memory.max work in practice. The episode includes a real-world example of how a misconfigured memory limit caused a production outage and how cgroupsv2's improved delegation model fixed it. Tune in to understand why control groups are the unsung heroes of container orchestration and how they enable reliable resource isolation at scale. #Linux #Cgroups #Cgroupsv2 #Containers #Kubernetes #MemoryManagement #ResourceIsolation #NoisyNeighbor #Google #Meta #ContainerOrchestration #Docker #ProductionOps #LinuxKernel #SystemAdministration #TechPodcast #FexingoBusiness #BusinessPodcast Keep every episode free: buymeacoffee.com/fexingo
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    12 mins
  • How Linux ZRAM Is Compressing Memory for Faster Systems

    How Linux ZRAM Is Compressing Memory for Faster Systems
    Jul 1 2026
    Episode 84 of The Linux Podcast with Fexingo dives into ZRAM — the Linux kernel module that compresses memory pages in RAM itself, reducing swap disk I/O and boosting performance, especially on systems with limited memory. Lucas and Luna explore how ZRAM works, its trade-offs compared to traditional swap, and a real-world case: Google's Chrome OS, which has used ZRAM by default since 2013. They explain the compression algorithms (LZ4, ZSTD), the impact on laptop battery life, and why server administrators are now adopting ZRAM for high-density cloud VMs. By the end, you'll understand why ZRAM is a hidden linchpin in modern Linux memory management. #Linux #ZRAM #MemoryCompression #Swap #Kernel #ChromeOS #LZ4 #ZSTD #Performance #Server #Cloud #Virtualization #OpenSource #Technology #LinuxPodcast #FexingoBusiness #BusinessPodcast #MemoryManagement Keep every episode free: buymeacoffee.com/fexingo
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    9 mins