Linux: Configurando servicos utilizando o systemctl

O systemctl é a ferramenta para gerenciar serviços no Fedora.

Listando os serviços

para listar serviços utilize o systemctl com as seguintes opções:

# systemctl -t service
UNIT                                                                         LOAD   ACTIVE SUB     DESCRIPTION
abrt-ccpp.service                                                            loaded active exited  Install ABRT coredump hook
abrt-oops.service                                                            loaded active running ABRT kernel log watcher
abrt-xorg.service                                                            loaded active running ABRT Xorg log watcher
abrtd.service                                                                loaded active running ABRT Automated Bug Reporting Tool
accounts-daemon.service                                                      loaded active running Accounts Service
...
systemd-vconsole-setup.service                                               loaded active exited  Setup Virtual Console
udisks2.service                                                              loaded active running Disk Manager
upower.service                                                               loaded active running Daemon for power management
wpa_supplicant.service                                                       loaded active running WPA Supplicant daemon

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.

60 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

Verificando o status de um serviço

Para verificar um serviço no sistema digite

# systemctl status httpd.service 
httpd.service - The Apache HTTP Server
  Loaded: loaded (/usr/lib/systemd/system/httpd.service; enabled)
  Active: active (running) since Tue 2013-08-06 10:35:56 BRT; 44s ago
 Process: 24662 ExecStop=/usr/sbin/httpd $OPTIONS -k graceful-stop (code=exited, status=0/SUCCESS)
Main PID: 24679 (httpd)
  Status: "Total requests: 0; Current requests/sec: 0; Current traffic:   0 B/sec"
  CGroup: name=systemd:/system/httpd.service
          ├─24679 /usr/sbin/httpd -DFOREGROUND
          ├─24680 /usr/sbin/httpd -DFOREGROUND
          ├─24681 /usr/sbin/httpd -DFOREGROUND
          ├─24682 /usr/sbin/httpd -DFOREGROUND
          ├─24683 /usr/sbin/httpd -DFOREGROUND
          └─24684 /usr/sbin/httpd -DFOREGROUND

Iniciando um serviço

Para iniciar um serviço no sistema digite

# systemctl start httpd.service 

Parar um serviço

Para arar um serviço no sistema digite

# systemctl stop httpd.service 

Verificar se um serviço esta ativo

Para verificar se um serviço no sistema digite

# systemctl is-enabled httpd.service 
enabled

Para desativar um serviço esta ativo

Para desativar um serviço no sistema digite

# systemctl disable httpd.service 
rm '/etc/systemd/system/multi-user.target.wants/httpd.service'

Para ativar um serviço esta ativo

Para ativar um serviço no sistema digite

# systemctl enable httpd.service 
ln -s '/usr/lib/systemd/system/httpd.service' '/etc/systemd/system/multi-user.target.wants/httpd.service'

Ver também

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