Episode 31 of The Linux Podcast with Fexingo dives into BPF, the Linux kernel's secret weapon for observability, security, and performance tuning. Lucas and Luna break down how BPF—originally the Berkeley Packet Filter—has evolved into a virtual machine inside the kernel, letting administrators run sandboxed programs to trace system calls, monitor network packets, and even patch running kernels without rebooting. They walk through real-world use cases: how Netflix uses BPF for continuous profiling, how Cloudflare leverages XDP for DDoS mitigation, and why BPF is replacing traditional monitoring tools like strace and tcpdump. They also discuss the learning curve and the emerging ecosystem of front-end tools like bpftrace and Cilium. If you manage Linux servers or just want to understand what makes modern Linux tick, this episode gives you the concrete hook to start exploring BPF today.

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