Ubuntu18.04初始的systemd service

两个位置

  1. /etc/systemd/system
root@dev2:~# ls /etc/systemd/system

aliyun.service                         getty.target.wants           ntp.service             syslog.service

chronyd.service                        graphical.target.wants       ntp-systemd-netif.path  systemd-resolved.service.wants

dbus-org.freedesktop.network1.service  multi-user.target.wants      sockets.target.wants    timers.target.wants

dbus-org.freedesktop.resolve1.service  network-online.target.wants  sshd.service

default.target.wants                   network-pre.target.wants     sysinit.target.wants
  1. /lib/systemd/system
root@dev2:~# ls /lib/systemd/system

accounts-daemon.service                 motd.service                       sys-fs-fuse-connections.mount

apparmor.service                        mountall-bootclean.service         sysinit.target

apt-daily.service                       mountall.service                   sysinit.target.wants

apt-daily.timer                         mountdevsubfs.service              sys-kernel-config.mount

apt-daily-upgrade.service               mountkernfs.service                sys-kernel-debug.mount

apt-daily-upgrade.timer                 mountnfs-bootclean.service         syslog.socket

atd.service                             mountnfs.service                   sysstat.service

autovt@.service                         multi-user.target                  systemd-ask-password-console.path

basic.target                            multi-user.target.wants            systemd-ask-password-console.service

bluetooth.target                        netplan-wpa@.service               systemd-ask-password-plymouth.path

bootlogd.service                        networkd-dispatcher.service        systemd-ask-password-plymouth.service

bootlogs.service                        network-online.target              systemd-ask-password-wall.path

bootmisc.service                        network-pre.target                 systemd-ask-password-wall.service

checkfs.service                         network.target                     systemd-backlight@.service

checkroot-bootclean.service             nscd.service                       systemd-binfmt.service

checkroot.service                       nss-lookup.target                  systemd-exit.service

chrony-dnssrv@.service                  nss-user-lookup.target             systemd-fsckd.service

chrony-dnssrv@.timer                    ondemand.service                   systemd-fsckd.socket

chrony.service                          paths.target                       systemd-fsck-root.service

cloud-config.service                    plymouth-halt.service              systemd-fsck@.service

cloud-config.target                     plymouth-kexec.service             systemd-halt.service

cloud-final.service                     plymouth-log.service               systemd-hibernate-resume@.service

cloud-init-local.service                plymouth-poweroff.service          systemd-hibernate.service

cloud-init.service                      plymouth-quit.service              systemd-hostnamed.service

console-getty.service                   plymouth-quit-wait.service         systemd-hwdb-update.service

console-setup.service                   plymouth-read-write.service        systemd-hybrid-sleep.service

container-getty@.service                plymouth-reboot.service            systemd-initctl.service

cron.service                            plymouth.service                   systemd-initctl.socket

cryptdisks-early.service                plymouth-start.service             systemd-journald-audit.socket

cryptdisks.service                      plymouth-switch-root.service       systemd-journald-dev-log.socket

cryptsetup-pre.target                   poweroff.target                    systemd-journald.service

cryptsetup.target                       poweroff.target.wants              systemd-journald.socket

ctrl-alt-del.target                     printer.target                     systemd-journal-flush.service

dbus-org.freedesktop.hostname1.service  procps.service                     systemd-kexec.service

dbus-org.freedesktop.locale1.service    proc-sys-fs-binfmt_misc.automount  systemd-localed.service

dbus-org.freedesktop.login1.service     proc-sys-fs-binfmt_misc.mount      systemd-logind.service

dbus-org.freedesktop.timedate1.service  quotaon.service                    systemd-machine-id-commit.service

dbus.service                            rc-local.service                   systemd-modules-load.service

dbus.socket                             rc.local.service                   systemd-networkd.service

debug-shell.service                     rc-local.service.d                 systemd-networkd.socket

default.target                          rc.service                         systemd-networkd-wait-online.service

dev-hugepages.mount                     rcS.service                        systemd-poweroff.service

dev-mqueue.mount                        reboot.service                     systemd-quotacheck.service

ecs_mq.service                          reboot.target                      systemd-random-seed.service

emergency.service                       reboot.target.wants                systemd-reboot.service

emergency.target                        remote-cryptsetup.target           systemd-remount-fs.service

exit.target                             remote-fs-pre.target               systemd-resolved.service

final.target                            remote-fs.target                   systemd-rfkill.service

friendly-recovery.service               rescue.service                     systemd-rfkill.socket

friendly-recovery.target                rescue.target                      systemd-suspend.service

fstrim.service                          rescue.target.wants                systemd-suspend-then-hibernate.service

fstrim.timer                            resolvconf-pull-resolved.path      systemd-sysctl.service

fuse.service                            resolvconf-pull-resolved.service   systemd-timedated.service

getty-pre.target                        resolvconf.service                 systemd-timesyncd.service

getty@.service                          rmnologin.service                  systemd-tmpfiles-clean.service

getty-static.service                    rpcbind.target                     systemd-tmpfiles-clean.timer

getty.target                            rsync.service                      systemd-tmpfiles-setup-dev.service

getty.target.wants                      rsyslog.service                    systemd-tmpfiles-setup.service

graphical.target                        runlevel0.target                   systemd-udevd-control.socket

graphical.target.wants                  runlevel1.target                   systemd-udevd-kernel.socket

halt.service                            runlevel1.target.wants             systemd-udevd.service

halt.target                             runlevel2.target                   systemd-udev-settle.service

halt.target.wants                       runlevel2.target.wants             systemd-udev-trigger.service

hibernate.target                        runlevel3.target                   systemd-update-utmp-runlevel.service

hostname.service                        runlevel3.target.wants             systemd-update-utmp.service

hwclock.service                         runlevel4.target                   systemd-user-sessions.service

hybrid-sleep.target                     runlevel4.target.wants             systemd-volatile-root.service

initrd-cleanup.service                  runlevel5.target                   system.slice

initrd-fs.target                        runlevel5.target.wants             system-update-cleanup.service

initrd-parse-etc.service                runlevel6.target                   system-update.target

initrd-root-device.target               sendsigs.service                   timers.target

initrd-root-fs.target                   serial-getty@.service              timers.target.wants

initrd-switch-root.service              setvtrgb.service                   time-sync.target

initrd-switch-root.target               shutdown.target                    udev.service

initrd-switch-root.target.wants         sigpwr.target                      ufw.service

initrd.target                           single.service                     umountfs.service

initrd-udevadm-cleanup-db.service       sleep.target                       umountnfs.service

irqbalance.service                      slices.target                      umountroot.service

kexec.target                            smartcard.target                   umount.target

kexec.target.wants                      sockets.target                     urandom.service

keyboard-setup.service                  sockets.target.wants               ureadahead.service

killprocs.service                       sound.target                       ureadahead-stop.service

kmod.service                            ssh.service                        ureadahead-stop.timer

kmod-static-nodes.service               ssh@.service                       user@.service

local-fs-pre.target                     ssh.socket                         user@.service.d

local-fs.target                         stop-bootlogd.service              user.slice

local-fs.target.wants                   stop-bootlogd-single.service       uuidd.service

machine.slice                           sudo.service                       uuidd.socket

module-init-tools.service               suspend.target                     x11-common.service

motd-news.service                       suspend-then-hibernate.target

motd-news.timer                         swap.target

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