Am 13.02.2014 13:04, schrieb Paul Gideon Dann: > Does anyone know of any standard system for receiving > notifications from systemd for unit state changes? I currently > use Monit for the monitoring of many processes, and it'll e-mail > me when things happen (e.g. a process was restarted). Since > switching to systemd, it's felt a bit silly that for several > processes, I'm having Monit monitor them simply because > systemd is unable to tell me it restarted a unit. Monit isn't > actually required to keep those processes alive as it once was, > because systemd can do that. I'd place a bet on the systemd dbus API: IIRC, it exports the state of each unit as a property and then emits the standard org.freedesktop.DBus.Properties.PropertiesChanged signal when the state changes. So, your task would be to subscribe to that signal and act on it. This could be nicely done in python (and maybe someone has done it already). I just listed some properties using qdbus: $ qdbus --system org.freedesktop.systemd1 /org/freedesktop/systemd1/unit/dbus_2eservice org.freedesktop.DBus.Properties.Get org.freedesktop.systemd1.Unit ActiveState active $ qdbus --system org.freedesktop.systemd1 /org/freedesktop/systemd1/unit/dbus_2eservice org.freedesktop.DBus.Properties.Get org.freedesktop.systemd1.Unit SubState running $ qdbus --system org.freedesktop.systemd1 /org/freedesktop/systemd1/unit/dbus_2eservice org.freedesktop.DBus.Properties.Get org.freedesktop.systemd1.Service MainPID 391 Surely, the ActiveState, SubState and MainPID properties would change when something gets restarted or stopped, and you would receive the PropertiesChanged signal.
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