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--- linux_wiki:boot_systems_into_different_targets_manually [2016/03/01 22:08]
billdozor [Other Systemctl Commands]
+++ linux_wiki:boot_systems_into_different_targets_manually [2019/05/25 23:50]
@@ Line 1: / Line 1: @@
-====== Boot Systems Into Different Targets Manually ======
-**General Information**
-There are no longer runlevels; systemd uses "targets".
-----
-===== Systemd Units =====
-Unit configuration file locations
-  * /usr/lib/systemd/system => system unit configuration files (default with system)
-  * /etc/systemd/system => additional configuration files (downloaded or custom)
-\\
-Show available unit types
-<code bash>
-systemctl -t help
-</code>
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-===== Systemd Targets =====
-Some common targets
-  * poweroff.target => power off the system
-  * emergency.target => single user (root), root file system mounted, do not mount any other file systems, no network services.
-    * Used if the system cannot be repaired in rescue.target
-  * rescue.target => single user environment (root), mount local file systems, with minimum services loaded, no network services.
-  * multi-user.target => Multi-user non-graphical, with all file systems and networking
-  * graphical.target => GUI environment, multi-user, with all file systems and networking
-  * reboot.target => reboot the system
-\\
-What target is the system currently in?
-<code bash>
-systemctl -t target
-</code>
-  * Look for either emergency, rescue, multi-user, or graphical.
-\\
-Current default target
-<code bash>
-systemctl get-default
-</code>
-\\
-Set default to graphical target
-<code bash>
-systemctl set-default graphical.target
-</code>
-\\
-List loaded unit files (systemctl) of type target (--type=target) whether they are active or not (--all)
-<code bash>
-systemctl --type=target --all
-</code>
-  * systemctl list-units => "list-units" is the default command to systemctl if none specified
-  * --type=target => show loaded, active units of the target type
-  * --all => show all loaded unit files, even if they are not active
-\\
-List all installed unit files on the system
-<code bash>
-systemctl list-unit-files
-</code>
-\\
-View a target's dependencies
-<code bash>
-systemctl list-dependencies multi-user.target
-</code>
-  * List what will start upon entering multi-user.target
-\\
-Move from graphical target to multi-user (command prompt)
-<code bash>
-systemctl isolate multi-user.target
-</code>
-  * Stops all GUI services, goes to command line login prompt
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-===== Other Systemctl Commands =====
-**Note:** By default, systemctl commands will only show the active configuration files unless you pass the "--all" option
-  * systemctl --type=service => list all loaded and active only service unit config files
-  * systemctl --type=service --all => list all loaded and active or inactive units
-  * systemctl is-active servicename => check if service is active or inactive
-  * systemctl is-enabled servicename => check if service is enabled or disabled
-  * systemctl --failed --type=service => list all failed services
-  * systemctl list-unit-files --type=service => view enabled and disabled settings for all units installed on the OS of the service type
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-===== Boot to rescue mode =====
-To boot to something other than the default target, such as the rescue target, during boot:
-  - Interrupt boot process at grub menu
-  - Press "e" to edit the boot entry
-  - Navigate to the "linux16" kernel entry
-  - Append "systemd.unit=rescue.target"
-  - Ctrl+x to continue boot process
-----