[systemd-bugs] [Bug 88986] New: standalone version of systemd to act as a process control system

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88986

            Bug ID: 88986
           Summary: standalone version of systemd to act as a process
                    control system
           Product: systemd
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: enhancement
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: sss at lambdacurry.com
        QA Contact: systemd-bugs at lists.freedesktop.org

It would be great to have a feature of systemd that acts as a process control
system - similar to something like supervisord (http://supervisord.org/) or
runit (http://smarden.org/runit/)

The problem is that the number of process supervisors to be used has increased:
1.  upstart for older deb systems
2. supervisord/runit for running applications (Ruby on Rails, Python, Go, etc.)
3. supervisord/runit to run  Docker containers 
(http://blog.phusion.nl/2015/01/20/baseimage-docker-fat-containers-treating-containers-vms/)
4. systemd in newer linux versions.

I do not believe we will upgrade older computers to newer OS running systemd
anytime soon, but it would be great if there was a way we could use
systemd+journald in older OS to run applications. This would atleast eliminate
the need to use supervisord/runit and give us a path to migrate to systemd.
Otherwise, I suspect that people will use supervisord/runit far more in
production (+docker) than systemd ..... and will continue to use it even on
newer systems, simply because of inertia.

I do understand that systemd needs to be pid 1, but I wonder if a subset of
functionality can still be exposed when it is not running as pid 1.... atleast
as good as supervisord.

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