Idrunlevelsactionprocess

Idrunlevelsactionprocess is a term used in some Unix-like system administration contexts to describe the component or layer responsible for coordinating actions during a transition between runlevels. It is not a universally standardized name, but serves as a descriptive label for the orchestration of start and stop operations that accompany a runlevel change.

Purpose and scope. The implied role of idrunlevelsactionprocess is to ensure that services are brought into a consistent state when switching from one runlevel to another. This involves determining what services must be stopped, which must be started, and in what order, with attention to dependencies, resource availability, and system integrity. The component also handles error reporting, retry logic, and logging of the transition sequence.

Operation and behavior. During a runlevel transition, the process calculates the delta between the current and target runlevels. It then initiates shutdown actions for services that should be disabled in the new level and subsequently starts services required by the target level. It coordinates with the underlying init system or service manager, monitors exit statuses, and may reattempt failed actions or roll back to a safe state if necessary.

Relation to init systems. In classic SysVinit environments, the concept maps to the sequence of rc scripts and their execution order in rc.d directories. In modern systems, where unit-based managers like systemd govern services, the role aligns with the orchestration of unit activation and target changes, ensuring that dependencies and proper ordering are respected.

Variations and terminology. The exact naming and implementation of this orchestration layer vary across systems. The term idrunlevelsactionprocess is more of a conceptual descriptor than a standard component name found in official documentation. See also: init, runlevel, SysVinit, systemd, rc.d, target units.