s6-linux-init-runleveld starts the daemon corresponding to s6-linux-init-telinit. It is very similar to goetia-runner (which corresponds to system-run). s6-linux-init-runleveld can be used to start and stop bundles (bundles replace a functionality historically called runlevels) and have the corresponding s6-rc command executed from the supervision tree. This makes the transition resilient to e.g. interface crashes or the command itself stopping the interface it was executed from.