Linux - Ch 9
Path units have a _________extension and are used to delay the activation of a service until a specific file system change occurs.
.path
Systemd activates system _________, server daemons and other process.
resources
A feature of systemd is that it provides a method of tracking related processes by using _____________
control groups
The service state that provides additional information about the service
status
Service units have a __________ extension and represent system services. This type of unit is used to start frequently accessed daemons, such as a web server.
.service
Socket units have a ____________ extension and represent inter-process communication (IPC) sockets that systemd should monitor.
.socket
Masking creates a link in the configuration directories to the ____________ file which prevents the service from starting
/dev/null
The _____________ command is used to manage different types of systemd objects called units
systemctl
What Systemctl Command lets you disable a service from starting at boot time?
systemctl disable UNIT
What is the command to disable the cupsd service
systemctl disable cupsd
What Systemctl Command lets you configure a service to start at boot time?
systemctl enable UNIT
What is the command to enable the sshd service
systemctl enable sshd
What Systemctl Command lets you list units which are required and wanted by the specified unit?
systemctl list-dependencies UNIT
What Systemctl Command lets you completely disable a service from being started, both manually and at boot?
systemctl mask UNIT
What Systemctl Command lets you reload the configuration file of a running service?
systemctl reload UNIT
What Systemctl Command lets you restart a service on a running system?
systemctl restart UNIT
What is the command to restart the httpd service
systemctl restart httpd
What Systemctl Command lets you start a service on a running system?
systemctl start UNIT
What Systemctl Command lets you view detailed information about a unit state?
systemctl status UNIT
What is the command to check the status of the sshd service
systemctl status sshd
What Systemctl Command lets you stop a service on a running system?
systemctl stop UNIT
What Systemctl Command lets you make a masked service available?
systemctl unmask UNIT
The ________ daemon manages startup for Linux
systemd
Daemons generally start automatically at _________ and run until shutdown or until they are manually stopped.
boot time
Sockets may be created by a _________ or may be separated from the _______ and be created by another process
daemon
__________ are processes that either wait or run in the background performing various tasks
daemons
The service state that indicates whether the service unit is in memory
loaded
Name 4 service states in systemd
loaded, active, main PID, status
The service state that shows the main process ID of the service including the command name
main PID
__________ a service prevents an administrator from accidentally starting a service that conflicts with others
masking
The names of daemons typically end in the letter __________
d
The service state that indicates whether the service unit is running and for how long
active
Systemd uses units to manage different types of ___________
objects
A feature of systemd is that it allows ______ starting of daemons without requiring separate services
on-demand
Starting or stopping a service may make a one-time change to the state of the system. This is called a ____________
oneshot
A feature of systemd is that it has _________ capabilities which increase the boot speed
parallelization
A ___________ is used to delay the activation of a service and is commonly used for services with _________ directories for printing
path, spool
Some services have the ability to _________ their configuration files
reload
__________ a service does not change the process ID associated with various service processes
reloading
During a _____ of a running service, the service is stopped and then started.
restart
___________ a service changes the process ID
restarting
A _________ unit is used to start frequently accessed daemons
service
A ____________ in the systemd sense refers to one or more daemons.
service
A feature of systemd is that it has automatic _______________ management which can prevent long timeouts
service dependency
What 3 unit types does systemd use?
service, socket, path
A ___________ unit represents inter-process communication
socket
A daemon uses a ___________ to listen for connections
socket
The xinetd and initd listen for client connections and are sometimes called __________
super-servers
Name 2 previous daemon management systems
systemv, initd
What command is used to stop masking of a service
unmasking
Name 2 systems that started less frequently used daemons
xinetd, initd
