systemd是否支持分叉守护程序在失败时重新启动？

Matt 发表于 Dev

马特

最初发布在StackOverflow上，告诉来这里询问。回顾一下对话-

不，我实际上还无法尝试进行更改以查看发生了什么（不是在不影响正在运行的生产服务的情况下）。
RTFM尽职调查已完成。他们没有涵盖这一点。

我最初的SO问题如下：

假设我的systemd单位文件中包含以下内容：

Type=forking
Restart=on-failure

父进程退出，状态为0（子进程已成功启动）。在以后的某个时间，孩子死于非零状态。发生什么了？systemd可以跟踪子守护进程的PID：

Process: 1768 ExecStart=/bin/mydaemon (code=exited, status=0/SUCCESS)
Main PID: 1770 (mydaemon)

是Restart=on-failure只盯着父退出状态，或者还有孩子呢？

腕骨

我创建了以下单位文件：

[Unit]
Description=Something

[Service]
Type=forking
WorkingDirectory=/tmp
ExecStart=/tmp/script.sh
ExecStop=/tmp/script.sh
Restart=on-failure

script.sh包含以下内容：

#!/bin/sh
echo "Forking"
/tmp/myscript.sh &

myscript.sh包含以下内容：

#!/bin/sh
sleep 60
exit 1

果然，每隔60秒，systemd将重新启动服务。

如此处所示，请注意不同的PID和开始时间，请注意它将重新启动父级：

linux:~ # systemctl status myService.service
● myService.service - Something
   Loaded: loaded (/etc/systemd/system/myService.service; static; vendor preset: disabled)
   Active: active (running) since Mon 2017-07-10 20:43:29 CEST; 57s ago
  Process: 4393 ExecStart=/tmp/script.sh (code=exited, status=0/SUCCESS)
 Main PID: 4396 (script.sh)
    Tasks: 2 (limit: 512)
   CGroup: /system.slice/myService.service
           ├─4396 /bin/sh /tmp/script.sh
           └─4397 sleep 60

Jul 10 20:43:29 linux.suse systemd[1]: Starting Something...
Jul 10 20:43:29 linux.suse script.sh[4393]: Forking
Jul 10 20:43:29 linux.suse systemd[1]: Started Something.
linux:~ # systemctl status myService.service
● myService.service - Something
   Loaded: loaded (/etc/systemd/system/myService.service; static; vendor preset: disabled)
   Active: active (running) since Mon 2017-07-10 20:44:29 CEST; 1s ago
  Process: 4409 ExecStop=/tmp/script.sh (code=exited, status=0/SUCCESS)
  Process: 4417 ExecStart=/tmp/script.sh (code=exited, status=0/SUCCESS)
 Main PID: 4420 (script.sh)
    Tasks: 2 (limit: 512)
   CGroup: /system.slice/myService.service
           ├─4420 /bin/sh /tmp/script.sh
           └─4421 sleep 60

Jul 10 20:44:29 linux.suse systemd[1]: Starting Something...
Jul 10 20:44:29 linux.suse script.sh[4417]: Forking
Jul 10 20:44:29 linux.suse systemd[1]: Started Something.

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。