Services

• Daemons

• SystemV

• SystemD

• Upstart

Runlevel

Initialization

• /etc/init.d

• /etc/rc0.d

• /etc/rc1.d

• /etc/rc2.d

• /etc/rc3.d

• /etc/rc4.d

• /etc/rc5.d

• /etc/rc6.d

• /etc/rcS.d

• /etc/rc.d

• /etc/rc.local

Configuration

• /etc/default/

Management

• Systemd

• System-V

• Init-d

• Upstart

• /etc/sysctl.d

• /etc/systemd

Commands

Services

Command	Type	Description
service		run a System V init script
sysctl		read/write system parameters
sysctl		configure kernel parameters at runtime
systemctl		Control the systemd system and service manager
systemd		systemd system and service manager