25.5. Listing systemd units

Procedure

• List all active units on the system with the systemctl utility. The terminal returns an output similar to the following example:

  # systemctl
  UNIT                                                LOAD   ACTIVE SUB       DESCRIPTION
  …​
  init.scope                                          loaded active running   System and Service Manager
  session-2.scope                                     loaded active running   Session 2 of user jdoe
  abrt-ccpp.service                                   loaded active exited    Install ABRT coredump hook
  abrt-oops.service                                   loaded active running   ABRT kernel log watcher
  abrt-vmcore.service                                 loaded active exited    Harvest vmcores for ABRT
  abrt-xorg.service                                   loaded active running   ABRT Xorg log watcher
  …​
  -.slice                                             loaded active active    Root Slice
  machine.slice                                       loaded active active    Virtual Machine and Container Slice system-getty.slice                                                                       loaded active active    system-getty.slice
  system-lvm2\x2dpvscan.slice                         loaded active active    system-lvm2\x2dpvscan.slice
  system-sshd\x2dkeygen.slice                         loaded active active    system-sshd\x2dkeygen.slice
  system-systemd\x2dhibernate\x2dresume.slice         loaded active active    system-systemd\x2dhibernate\x2dresume>
  system-user\x2druntime\x2ddir.slice                 loaded active active    system-user\x2druntime\x2ddir.slice
  system.slice                                        loaded active active    System Slice
  user-1000.slice                                     loaded active active    User Slice of UID 1000
  user-42.slice                                       loaded active active    User Slice of UID 42
  user.slice                                          loaded active active    User and Session Slice
  …​

  UNIT

  A name of a unit that also reflects the unit position in a control group hierarchy. The units relevant for resource control are a slice, a scope, and a service.

  LOAD

  Indicates whether the unit configuration file was properly loaded. If the unit file failed to load, the field provides the state error instead of loaded. Other unit load states are: stub, merged, and masked.

  ACTIVE

  The high-level unit activation state, which is a generalization of SUB.

  SUB

  The low-level unit activation state. The range of possible values depends on the unit type.

  DESCRIPTION

  The description of the unit content and functionality.

• List all active and inactive units:

  # systemctl --all

• Limit the amount of information in the output:

  # systemctl --type service,masked

  The --type option requires a comma-separated list of unit types such as a service and a slice, or unit load states such as loaded and masked.

  See systemd.resource-control(5) and systemd.exec(5) man pages on your system for more information.