Episode 46 of The Linux Podcast with Fexingo dives into the unsung heroes of container file systems: SquashFS and OverlayFS. Lucas and Luna explain how these two Linux kernel features work together to minimize disk usage, accelerate container startup, and reduce memory footprint in production environments. The hosts walk through a concrete example of a large Rails application container — from image building to running a hundred replicas — showing how SquashFS compresses layers and OverlayFS merges them copy-on-write. They also discuss trade-offs: SquashFS's readonly nature and size overhead, OverlayFS's layer limit and performance considerations. No hype, just technical specifics for engineers managing container workloads.

#SquashFS #OverlayFS #ContainerFileSystems #LinuxKernel #ContainerEfficiency #DockerLayers #CopyOnWrite #ProductionLinux #DiskUsage #ContainerStartup #RailsContainer #ImageCompression #LayerMerging #ReadOnlyFilesystem #Technology #CloudNative #FexingoBusiness #BusinessPodcast

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