For those who a) use Proxmox to b) manage containers c) some of which are of ostype: unmanaged (e.g. those who run a virtual OpenWRT router, like me...) be warn

For those who a) use Proxmox to b) manage containers c) some of which are of ostype: unmanaged (e.g. those who run a virtual OpenWRT router, like me...) be warned that the current version of Proxmox will not start those containers due to a bug/an omission in the PVE::LXC::Setup package (/usr/share/perl5/PVE/LXC/Setup.pm) which makes it attempt to call a non-existing method to configure cgroupv2 support on such containers. The following patch will work for now while the problem has not yet been solved in the repo: --- /usr/share/perl5/PVE/LXC/Setup.pm.org +++ /usr/share/perl5/PVE/LXC/Setup.pm @@ -424,6 +424,8 @@ sub unified_cgroupv2_support { my ($self) = @_; + $self->{plugin} //='PVE::LXC::Setup::Base'; # unmanaged + $self->protected_call(sub { $self->{plugin}->unified_cgroupv2_support(); }); I hit upon this snag when updating the server-under-the-stairs which went off without any problems except for the router container not starting.