On Mar 17, 2014 8:51 AM, "Vetoshkin Nikita" <<a href="mailto:nikita.vetoshkin@gmail.com">nikita.vetoshkin@gmail.com</a>> wrote: > > Hi there! > I'm exploring possibility to use systemd as process manager / "containizer" for Apache Mesos (<a href="http://mesos.apache.org">http://mesos.apache.org</a>). At the moment I'm trying to use systemctl/systemd-run to implement following: > * Start process with specified restrictions (It works wih systemd 211) > * Stop process - systemctl stop/ kill works too. > * Read process status - systemctl lacks robot readable output of process status. > * Reap process status: > * there is "systemctl reset-failed" - but it reaps all failed units > * services exited with 0 exit code are gone completely (maybe it's not an issue) > * Read container (cgroup) resource usage - it is possible to do that manually, but I think it could be great to have an API. > * Start processes in --user systemd instance > When I call systemd-run --user env I get "Failed to create message: Input/output error", digging with strace shows that dbus starts service "/usr/share/dbus-1/services/org.freedesktop.systemd1.service" which has Exec=/bin/false inside. I'm using Fedora 20 with systemd-211 directly from koji. > > I'd appreciate any guides, hints, suggestions. Thanks! There *is* an API, and has been since day one – the DBus interface [1]. It's also what systemctl itself uses to talk to systemd. (So systemctl's output is not machine readable because it's the human interface.) In addition to systemd itself, almost all other daemons – logind, machined, timedated, etc. – have their own DBus interfaces, you'll find detailed descriptions in the same website. (For systemd-run --user, however, you will need to connect to systemd's private socket or to enable the "user bus" somehow and connect to that. The option expects a single user bus (which is still a future thing), instead of the current per-session bus that it's currently trying to find your systemd --user instance on...) [1] <a href="http://www.freedesktop.org/wiki/Software/systemd/dbus/">http://www.freedesktop.org/wiki/Software/systemd/dbus/</a> -- Mantas Mikulėnas <<a href="mailto:grawity@gmail.com">grawity@gmail.com</a>>