Comment vérifier la cible active actuelle dans RHEL7 / CentOS 7

Dans RHEL 6, nous pouvons runlevelvérifier le niveau de fonctionnement actuel de mon système.

Dans RHEL 7, nous avons la commande systemctl get-defaultpour vérifier la cible par défaut, mais comment vérifier la cible active actuelle?

systemctl list-units --type target

Selon la documentation ici: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/System_Administrators_Guide/sect-Managing_Services_with_systemd-Targets.html

Voici l'exemple de sortie (il ne s'agit pas d'une réponse d'une ligne):

[root@ ~]# systemctl list-units --type target
UNIT                   LOAD   ACTIVE SUB    DESCRIPTION
basic.target           loaded active active Basic System
cryptsetup.target      loaded active active Encrypted Volumes
getty.target           loaded active active Login Prompts
graphical.target       loaded active active Graphical Interface
local-fs-pre.target    loaded active active Local File Systems (Pre)
local-fs.target        loaded active active Local File Systems
multi-user.target      loaded active active Multi-User System
network-online.target  loaded active active Network is Online
network.target         loaded active active Network
nfs-client.target      loaded active active NFS client services
nss-user-lookup.target loaded active active User and Group Name Lookups
paths.target           loaded active active Paths
remote-fs-pre.target   loaded active active Remote File Systems (Pre)
remote-fs.target       loaded active active Remote File Systems
slices.target          loaded active active Slices
sockets.target         loaded active active Sockets
sound.target           loaded active active Sound Card
swap.target            loaded active active Swap
sysinit.target         loaded active active System Initialization
timers.target          loaded active active Timers

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

20 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
[root@ ~]# systemctl isolate multi-user.target
[root@ ~]# systemctl list-units --type target
UNIT                  LOAD   ACTIVE SUB    DESCRIPTION
basic.target          loaded active active Basic System
cryptsetup.target     loaded active active Encrypted Volumes
getty.target          loaded active active Login Prompts
local-fs-pre.target   loaded active active Local File Systems (Pre)
local-fs.target       loaded active active Local File Systems
multi-user.target     loaded active active Multi-User System
network-online.target loaded active active Network is Online
network.target        loaded active active Network
nfs-client.target     loaded active active NFS client services
paths.target          loaded active active Paths
remote-fs-pre.target  loaded active active Remote File Systems (Pre)
remote-fs.target      loaded active active Remote File Systems
slices.target         loaded active active Slices
sockets.target        loaded active active Sockets
swap.target           loaded active active Swap
sysinit.target        loaded active active System Initialization
timers.target         loaded active active Timers

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

17 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
[root@ ~]# cat /etc/redhat-release 
CentOS Linux release 7.3.1611 (Core) 
[root@ ~]# 

Nous commençons avec graphical.target et la première fois que la commande est exécutée, nous pouvons voir à la fois multi-user.target et graphical.target. Ceci est dû au fait que graphical.target nécessite plusieurs utilisateurs.

Ensuite, nous passons à multi -user.target. Si vous voyez multi -user.target mais que vous ne voyez pas graphical.target, nous sommes dans la cible multi-utilisateurs.

Rescue.target et emergency.target sont les deux autres cibles communes.

• Si vous voyez rescue.target, vous êtes dans la cible de sauvetage.
• Si vous voyez emergency.target, alors vous êtes dans la cible d'urgence.