init/systemd

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innserv -d

after editing the default-stop/start parameters, recreate the appropriate start and kill scripts in the rcx.d directory

emergency.target

emergency shell

/etc/inittab

file that defines runlevels

poweroff.target

halts the system, symbolic link to runlevel0.target

reload

init parameter rereads the associated service's configuration file

start

init parameter starts the associated service

stop

init parameter stops the associated service

restart

init parameter stops then starts the associated service

status

init parameter views the status of the service

/etc/init.d

location of bsd style init scripts

/etc/rc.d

location of system v init scripts

systemctl

manage services/runlevels in systemd

systemctl set-default

modifies the default boot target

multi-user.target

multi-user, non graphical mode. symbolic link to runlevel3.target

graphical.target

multiuser graphical mode, symbolic link to runlevel5.target

0

runlevel halts the system

6

runlevel reboots the system

5

runlevel starts linux in graphical multiuser mode with networking enabled

2

runlevel starts linux in multiuser mode with networking disabled

3

runlevel starts linux in multiuser mode with networking enabled

1

runlevel starts linux in single user mode

rc.local

similar to the bsd style init boot.local. can add commands to be run at startup.

rescue.target

single user mode, symbolic link to runlevel1.target

chkconfig -s

specify the runlevels you want a daemon to start in

systemctl start

start a service in systemd

systemctl enable

start a service on boot

systemctl stop

stop a service in systemd

chkconfig -l

view current runlevel configuration for a service, or all daemons

systemctl get-default

view the current default runlevel

rc

bsd and sysv script used to switch between runlevels while the system is running

boot.local

bsd script run by init at startup. can be modified to run commands automatically at startup

boot

bsd script run by init when the system first starts. loads kernel modules, verifies file system, sets the system clock

halt

bsd script used to stop or reboot system. run when runlevel is changed to 0 or 6

systemctl isolate

change runlevels with systemctl

systemctl status

check the status of a service in systemd

systemctl is-enabled

check to see if a service is enabled/disabled on boot

chkconfig

configure a daemon to start at it's default runlevels

4

custom runlevel

insserv -r

disable a service (remove all links from rcx.d) and stop the service if currently running

systemctl disable

disable a service on boot

/etc/systemd/system/default.target

pointer to default boot target. replaces /etc/inittab

insserv

reads info in INIT INFO block of an init script to determine which runlevels the associated service should run in by default

reboot.target

reboot, symbolic link to runlevel6.target

init q

reread the /etc/inittab file

systemctl restart

restart a service in systemd

rc.sysinit

sysv script similar to the boot script on systems with bsd style init. sets the path, checks file systems for errors...


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