7 terms
GRUB is the bootloader most Linux systems use to load the kernel and initramfs from disk and pass control to the operating system at startup.
An init system is the first user-space process a Linux kernel starts, running as PID 1 to boot services, supervise them and shut the system down.
journalctl is the systemd command for querying the binary journal, filtering Linux log entries by unit, boot, priority, time and other fields.
systemctl is the command-line tool for controlling systemd on Linux, used to start, stop, enable and inspect services, targets and other units.
systemd is the Linux init system and service manager that runs as PID 1, starts the system in parallel and supervises services through declarative units.
A systemd timer is a Linux unit file that activates another unit on a calendar schedule or after a delay, a modern alternative to cron jobs.
A systemd unit is a declarative configuration object that tells systemd how to start, stop, order and supervise one resource during Linux system initialization.