systemd vs BusyBox Init: How to Choose the Right Init System for Embedded Linux

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Choosing between systemd and BusyBox init is one of the earliest and hardest-to-reverse decisions in embedded Linux product development, as it shapes service dependencies, failure detection, and library requirements for the product's entire lifespan. BusyBox init is generally recommended for devices with a fixed, small set of services, offering a minimal footprint and simple configuration, while systemd suits devices needing supervised, interdependent services with features like watchdog support and resource limits. Opting for systemd comes at the cost of a significantly larger image, a minimum kernel version of 5.10, and a glibc toolchain dependency. Developers should also note that init selection and device management are separate decisions — udev rules can be used without systemd in both Yocto and Buildroot build systems. A key BusyBox init limitation is that it lacks restart back-off or start limits, meaning a failing process will loop indefinitely, paced only by a one-second sleep in the init loop.

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