Init vs systemd

Overview

Definition of systemd

According to Lennart Poettering, the developper of systemd:

"systemd is a system and session manager for Linux, compatible with SysV and LSB init scripts. systemd provides aggressive parallelization capabilities, uses socket and D-Bus activation for starting devices."

In Simpler Terms:

systemd is a more efficient method of controlling processes. It has the flexibility to start services in parallel, and have them communicate with each other, even if they are restarted (respawned). This is particularly useful for system administrators to temporarily service or update services without affecting the other dependent services.

The Old Way: init

Upon computer boot-up, and after the Kernel process is started, it traditionally launched the init process (usually Process ID #: 1). This important process manages (launches) other common services.

Additional Resources

• YouTube Video (beyond init: systemd): (beyond init: systemd)