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systemd in hybrid mode uses v1 hierarchies for controllers and v2 for process tracking. The LXC code uses virCgroupAddMachineProcess() to move processes into appropriate cgroup by manipulating cgroupfs directly. (Note, despite libvirt also supports talking to systemd directly via org.freedesktop.machine1 API.) If this path is taken, libvirt/lxc must convince systemd that processes really belong to new cgroup, i.e. also the tracking v2 hierarchy must undergo migration too. The current check would evaluate v2 backend as unavailable with hybrid mode (because there are no available controllers). Simplify the condition and consider the mounted cgroup2 as sufficient to touch v2 hierarchy. This consequently creates an issue with binding the V2 mount. In hybrid mode the V2 filesystem may be mounted upon the V1 filesystem. By reversing the order in which backends are mounted in virCgroupBindMount this problem is circumvented. Resolves: https://gitlab.com/libvirt/libvirt/-/issues/182 Signed-off-by: Eric van Blokland <mail@ericvanblokland.nl> Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Libvirt API for virtualization
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.
Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.
Further information about the libvirt project can be found on the website:
License
The libvirt C API is distributed under the terms of GNU Lesser
General Public License, version 2.1 (or later). Some parts of the code
that are not part of the C library may have the more restrictive GNU
General Public License, version 2.0 (or later). See the files
COPYING.LESSER and COPYING for full license
terms & conditions.
Installation
Instructions on building and installing libvirt can be found on the website:
https://libvirt.org/compiling.html
Contributing
The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:
https://libvirt.org/contribute.html
Contact
The libvirt project has two primary mailing lists:
- libvirt-users@redhat.com (for user discussions)
- libvir-list@redhat.com (for development only)
Further details on contacting the project are available on the website: