Cilium 1.20.0 Needs Kernel BTF Support, Breaking It on Stock Raspberry Pi OS
Cilium 1.20.0 depends on the BTF (BPF Type Format) kernel feature to interpret kernel data structures for its eBPF-based networking and security functions. Raspberry Pi OS's kernel omits BTF by default to conserve resources, so Cilium 1.20.0 fails to run on that platform without changes. Users are left with the choice of downgrading Cilium, switching to other networking tools, or applying manual kernel modifications that require specialized skills. The article argues that a lasting fix will require coordination between the Cilium community and Raspberry Pi developers, such as enabling BTF upstream or maintaining community patches.
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