☰

为什么 systemd 会报告某些 Type=simple 服务的作业失败？

tag-icon • tag-icon systemd services systemctl
为什么 systemd 会报告某些 Type=simple 服务的作业失败？

根据系统文档，子进程分叉后，systemd 将立即报告成功。这与我的快速测试结果一致：

$ cat /etc/systemd/system/test.service
[Service]
Type=simple
ExecStart=/bin/asdfg
$ systemctl daemon-reload
$ systemctl start test  # Exits immediately
$ echo $?
0
$ systemctl status test
● test.service
   Loaded: loaded (/etc/systemd/system/test.service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2019-12-15 01:56:52 CST; 2s ago
  Process: 24483 ExecStart=/bin/asdfg (code=exited, status=203/EXEC)
 Main PID: 24483 (code=exited, status=203/EXEC)

Dec 15 01:56:52 iBug-Server systemd[1]: Started test.service.
Dec 15 01:56:52 iBug-Server systemd[24483]: test.service: Failed to execute command: No such file or directory
Dec 15 01:56:52 iBug-Server systemd[24483]: test.service: Failed at step EXEC spawning /bin/asdfg: No such file or directory
Dec 15 01:56:52 iBug-Server systemd[1]: test.service: Main process exited, code=exited, status=203/EXEC
Dec 15 01:56:52 iBug-Server systemd[1]: test.service: Failed with result 'exit-code'.
$

但是，根据我过去的经验，当某些服务启动或重新启动失败时，systemd 会报告这样的失败，例如nginx或ssh：

Job for test.service failed because the control process exited with error code.
See "systemctl status test.service" and "journalctl -xe" for details.

为什么 systemd 不报告我的测试服务（与其在 Freedesktop.org 上的手册页匹配）的失败，而是报告其他服务的失败？

澄清：我特指的是命令systemctl start/restart。通过“报告失败”，它打印出消息并以非零状态退出。的输出systemctl status无关紧要。

相关内容