Paunch: extend systemd unit flags

[Cédric Jeanneret]

Hellow,

It would be great to allow paunch to extend a bit the content of the systemd unit created for the containers. I especially think the following are of interest:
RuntimeDirectory
StateDirectory
CacheDirectory

The path is relative, so if we set RuntimeDirectory=foo, it will mean /run/foo

Since the /var/run is usually emptied upon reboot, and as podman doesn't create host directories for its volumes, injecting those flags would provide a really nice way to avoid issues.

More doc about those flags might be found here:
https://www.freedesktop.org/software/systemd/man/systemd.exec.html

We might also take the opportunity to allow for CPU/Memory limitation.

Thanks!

Cheers,

C.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/635133

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/635133
Committed: https://git.openstack.org/cgit/openstack/paunch/commit/?id=b452a33030a19c34fdc3dbf65f39aa5f511de1e3
Submitter: Zuul
Branch: master

commit b452a33030a19c34fdc3dbf65f39aa5f511de1e3
Author: Cédric Jeanneret <email address hidden>
Date: Wed Feb 6 11:24:07 2019 +0100

    Allow to pass some of systemd.exec flags

    It may happen we have some shared directory mounted within
    the container - if it is located in /run or in some other
    tmpfs location, it won't persist across reboots.

    SystemD provides the capability to create those directories, and
    this patch allows to take advantage of this capacity.

    Basically, we might add as many flag as we want.

    Closes-Bug: #1814764
    Change-Id: I5d2ef49ec205b7a43c488d4ceef0724e5ef2b6cc

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/paunch 4.3.0 release.