在这个目录下：/usr/lib/systemd/system/

[root@localhost ~]# ls /usr/lib/systemd/system/
arp-ethers.service
auditd.service
autovt@.service
basic.target
basic.target.wants
blk-availability.service
bluetooth.target
brandbot.path
brandbot.service
conntrackd.service
console-getty.service
console-shell.service
containerd.service
container-getty@.service
cpupower.service
crond.service
cryptsetup-pre.target
cryptsetup.target
ctrl-alt-del.target
dbus-org.freedesktop.hostname1.service
dbus-org.freedesktop.import1.service
dbus-org.freedesktop.locale1.service