Hello,
This is a question out of curiosity and not currently any problem.
I have a timer file like this:
[Unit]
Description=Foo
After=multi-user.target
[Timer]
OnCalendar=*:0/5
Persistent=false
[Install]
WantedBy=timers.target
And corresponding service file like this:
[Unit]
Description=Foo
[Service]
Type=oneshot
ExecStart=-/usr/bin/checkservices
/usr/bin/checkservices checks if some important services are running and
sends alert if not.
Above timer is supposed to run every five minutes. But not while system
is still booting.
If I do not put After=multi-user.target then timer gets triggered even
before those services have begun (while booting) and sends false alarm.
With above settings, I do not face that issue.
But just out of curiosity I am eager to know if this or something
similar can cause loop and hang system forever from booting?
Because AFAIK timers.target runs before multi-user.target. But here
something inside timers.target waits for multi-user.target.
So how does systemd resolve this loop?
Thanks in advance
Amish
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