[systemd-devel] systemd-nspawn: starting multiple shells

[aleivag]

hi:

so for finding the pid the solution its (big surprise :D ) using systemd,
instead of just executing you systemd-nspawn in bash you start it as a
systemd-unit (you can even do this as ephemeral unit with `sytemd-run
--unit myspawn.service systemd-nspawn ....bla...`)

then to get the ip of the nspawn process no need to ps aux you just do
`systemctl show -pMainPID myspawn.service`, that will give you the mainpid,
and your child you can get it with `pgrep -P`.

as personal oprinion... i much like `tail -f /dev/null` better than `sleep
<big number>` as a wait to "wait for ever"

Alvaro Leiva


On Sat, Jun 23, 2018 at 2:02 PM Nikolaus Rath <Nikolaus at rath.org> wrote:

> On Jun 23 2018, Nikolaus Rath <Nikolaus at rath.org> wrote:
> > On Jun 23 2018, aleivag <aleivag at gmail.com> wrote:
> >> short answer, yes, `machinectl login` is only suppported for
> systemd-init ,
> >> and `machinectl shell` `systemd-run` will try to talk to the container
> via
> >> dbus, so i dont think you are force to have systemd runing inside the
> >> container (i may be wrong) but you do need to have dbus (and its easy to
> >> just have systemd).  if you dont need it, you can always use nsenter to
> >> access a namespace on your machine
> >
> > Still not working:
> [..]
> > $ sudo machinectl shell root at iofabric
> > [sudo] password for nikratio:
> > Failed to get shell PTY: Cannot set property
> > StandardInputFileDescriptor, or unknown property.
>
> So this seems to be caused by systemd in the container being too old,
> and is therefore not available here.
>
> The 'nsenter' approach seems to work so far, but I don't see a generally
> applicable way to figure out the right PID. Is there a trick for that?
>
> (I ran a "sleep <big-unique-numebr>" in the container and grepped "ps
> ax" for the number in the host).
>
> Best,
> -Nikolaus
>
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