SYSTEMD IS THE INIT SYSTEM AND SYSTEM
MANAGER THAT BECAME ,LINUX'S DEFAULT
BOOT ANSWER  ANNOUNCED BY ,LENNART
,POETTERING AND ,KAY ,SIEVERS IN ,APRIL
#BJAJ WITH THE ESSAY 8,RETHINKING ,,PID
#A01 AND FIRST SHIPPED AS A DISTRO
DEFAULT IN ,FEDORA #AE "<,MAY #BJAA">4
,IT REPLACED ,SYS,V INIT'S ORDERED SHELL
SCRIPTS WITH A DEPENDENCY GRAPH OF
UNITS3 SERVICES1 SOCKETS1 TIMERS1
MOUNTS1 AND TARGETS THAT BOOT IN
PARALLEL BECAUSE THE GRAPH  NOT A
NUMBERED LIST  DECIDES ORDERING4
,WHAT IT ACTUALLY IS
,THE NAME COVERS MORE THAN ,,PID #A3
SYSTEMD IS A FAMILY  JOURNALD "<BINARY
STRUCTURED LOGGING">1 SYSTEMD-BOOT "<THE
,,EFI BOOTLOADER FORMERLY GUMMIBOOT">1
NETWORKD1 RESOLVED1 TIMESYNCD1 LOGIND1
HOMED1 PLUS
SYSTEMCTL_/JOURNALCTL_/HOSTNAMECTL AS
THE CONTROL SURFACE4 ,IT ABSORBED UDEV
IN #BJAB4 ,ITS DEFINING MECHANICS3
SOCKET ACTIVATION "<SERVICES START WHEN
THEIR SOCKET IS TOUCHED">1 CGROUPS-BASED
PROCESS TRACKING "<NO DAEMON CAN ESCAPE
ITS SERVICE">1 AND DECLARATIVE UNIT
FILES INSTEAD OF EXECUTABLE SCRIPTS4
,THE CONTROVERSY  STATED PLAINLY
SYSTEMD'S TAKEOVER WAS ,LINUX'S LOUDEST
CIVIL WAR3 CRITICS ARGUED IT VIOLATED
,UNIX'S DO-ONE-THING PHILOSOPHY AND
BECAME AN UNPORTABLE DEPENDENCY WEB2
DEFENDERS POINTED AT PARALLEL BOOT1
RELIABLE PROCESS SUPERVISION1 AND THE
DEATH OF ,,PID-FILE GUESSING4 ,DEBIAN'S
TECHNICAL COMMITTEE VOTED FOR IT IN
,FEBRUARY #BJAD  THE DISSENT PRODUCED
,DEVUAN1 AND ,GENTOO1 ,SLACKWARE1
,ALPINE1 AND THE HOLDOUT FAMILIES STILL
BOOT ,OPEN,R,C1 ,SYS,V1 OR RUNIT4
,WHETHER YOU RUN IT OR REFUSE IT1
CHAPTER #AG'S BOOT ANATOMY IS
SYSTEMD-SHAPED ON THE MAJORITY OF MODERN
INSTALLS4
,SEE ALSO
- ,INSIDE A ,LINUX ,SYSTEM  THE BOOT
CHAIN IT SITS IN - ,LOGS ,MONITORING AND
,TIME  JOURNALD'S SIDE OF THE STORY -
,PROCESSES  CGROUPS AND SERVICE
SUPERVISION - ,LINUX  ,,GRUB  ,GLIBC