systemctl
daemon-reload: Reload the configuration file of a service , If a new service is installed , Belong to systemctl
Administration , If the server configuration file for the new service takes effect , Need to reload .
init and systemd The difference of command , Brief introduction ：
systemctl --help view help !!!!!!!
systemctl enable | disable | is-enabled | status | is-active unit
systemctl get-default | set-default graphical.target
| multi-user.target islate Online switching mode
systemctl reload-daemon Load new unit configuration file
systemd Of unit Configuration file location for ： redhat series ： catalog /usr/lib/systemd/system/ lower
enable It's in /etc/systemd/system/multi-user.target.wants/ Under this directory do unit Soft chain of configuration file ：
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