服務無法在啟動時啟動

我正在 Debian 9 機器上自動啟動 Jenkins 服務。

我的服務很好。服務定義是：

[Unit]
SourcePath=/etc/init.d/jenkins
Description=LSB: Start Jenkins at boot time
Before=runlevel2.target runlevel3.target runlevel4.target runlevel5.target shutdown.target
After=remote-fs.target systemd-journald-dev-log.socket network-online.target
Wants=network-online.target
Conflicts=shutdown.target

[Service]
Type=forking
Restart=no
TimeoutStartSec=5min
TimeoutStopSec=10s
IgnoreSIGPIPE=no
KillMode=process
GuessMainPID=no
RemainAfterExit=yes
SysVStartPriority=2
ExecStart=/etc/init.d/jenkins start
ExecStop=/etc/init.d/jenkins stop

但問題是當我重新啟動節點時，服務不會自動啟動。我必須手動執行systemctl start jenkins

由於我自動部署此 VM，systemctl enable jenkins因此無法選擇手動操作。

創建新的 jenkins vm 後，它應該已經能夠在重新啟動後啟動服務。

即使我做一本手冊systemctl enable jenkins，我也會得到：

# systemctl enable jenkins
Synchronizing state of jenkins.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable jenkins
The unit files have no installation config (WantedBy, RequiredBy, Also, Alias
settings in the [Install] section, and DefaultInstance for template units).
This means they are not meant to be enabled using systemctl.
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
  .wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
  a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
  D-Bus, udev, scripted systemctl call, ...).
4) In case of template units, the unit is meant to be enabled with some
  instance name specified.

我在這裡缺少什麼嗎？

[Install]就像它說的那樣，您似乎確實錯過了該部分。從 Jenkins 網站，Installing Jenkins as a Unix daemon，嘗試添加：

[Install]
WantedBy=multi-user.target

請注意，他們的股票範例直接呼叫 java，而不是分叉一個 shell 腳本。

要使服務在引導時啟動，請執行：

systemctl enable jenkins

或者手動創建符號連結：

ln -s /etc/systemd/system/jenkins.service /etc/systemd/system/multi-user.target.wants/jenkins.service

引用自：https://unix.stackexchange.com/questions/502371