While working on
https://bugs.launchpad.net/ubuntu/+source/openvpn/+bug/1934781, I did
face a similar issue.
This was triggered when trying to start openvpn with the openvpn-
server@.service unit file in a lxc container fetched from the daily-
ubuntu:${series} images.
The error observed was slightly different though:
openvpn_execve: unable to fork: Resource temporarily unavailable
(errno=11)
The error was observed in bionic, focal, and groovy. The error was
__not__ observed in hirsute and impish.
The following reports may be relevant here:
https://github.com/systemd/systemd/issues/6011
https://lists.linuxcontainers.org/pipermail/lxc-users/2018-June/014329.html
To verify the issue was indeed not related to a systemd change, I built
the openvpn package version available in hirsute for groovy and
installed it in my grovy lxc container. This time, I could __not__
observe the issue.
I am attaching a script slightly based on the openvpn autopkgtest suite
that can be run from withing a lxc container, which servers as a
reproducer for the issue. The script works for anything newer than
focal, but would need changes if were to be run in bionic due to recent
changes in easy-rsa.
** Bug watch added: github.com/systemd/systemd/issues #6011
https://github.com/systemd/systemd/issues/6011
** Attachment added: "reproduce_inside_lxc.sh"
https://bugs.launchpad.net/ubuntu/+source/openvpn/+bug/1631104/+attachment/5512551/+files/reproduce_inside_lxc.sh
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https://bugs.launchpad.net/bugs/1631104
Title:
The LimitNPROC line in /lib/systemd/system/openvpn@.service has to be
commented out in order to be able to start OpenVPN
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