** Changed in: lxc (Ubuntu)
Status: In Progress => Fix Released
** No longer affects: lxc
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hybrid control goup mode breaks lxc adt tests
Status in lxc package in Ubuntu:
I will disably hybrid control groups by default for now, but will
create a ppa with such systemd, for ease of testing.
FAIL: lxc-tests: /usr/bin/lxc-test-apparmor-mount
/usr/sbin/deluser: The user `lxcunpriv' does not exist.
/usr/bin/lxc-test-apparmor-mount: 138: /usr/bin/lxc-test-apparmor-mount:
cannot create /sys/fs/cgroup/unified/lxctest/tasks: Permission denied
Container is not defined
umount: /sys/kernel/security/apparmor/features/mount: not mounted
FAIL: lxc-tests: /usr/bin/lxc-test-unpriv
Removing user `lxcunpriv' ...
Warning: group `lxcunpriv' has no more members.
/usr/bin/lxc-test-unpriv: line 154: /sys/fs/cgroup/unified/lxctest/tasks:
c2 is not running
c1 is not running
FAIL: lxc-tests: /usr/bin/lxc-test-usernic
/usr/sbin/deluser: The user `usernic-user' does not exist.
/usr/bin/lxc-test-usernic: line 111: /sys/fs/cgroup/unified/lxctest/tasks:
PASS: lxc-tests: /usr/bin/lxc-test-utils
PASS: python3: API
Removing 'local diversion of /usr/bin/dirmngr to /usr/bin/dirmngr.orig'
CHANGES WITH 233:
* The "hybrid" control group mode has been modified to improve
compatibility with "legacy" cgroups-v1 setups. Specifically, the
"hybrid" setup of /sys/fs/cgroup is now pretty much identical to
"legacy" (including /sys/fs/cgroup/systemd as "name=systemd" named
cgroups-v1 hierarchy), the only externally visible change being that
the cgroups-v2 hierarchy is also mounted, to
/sys/fs/cgroup/unified. This should provide a large degree of
compatibility with "legacy" cgroups-v1, while taking benefit of the
better management capabilities of cgroups-v2.
* The default control group setup mode may be selected both a
via a set of kernel command line parameters (specifically:
systemd.legacy_systemd_cgroup_controller=), as well as a
default selected on the configure command line
(--with-default-hierarchy=). The upstream default is "hybrid"
(i.e. the cgroups-v1 + cgroups-v2 mixture discussed above) now, but
this will change in a future systemd version to be "unified" (pure
cgroups-v2 mode). The third option for the compile time option is
"legacy", to enter pure cgroups-v1 mode. We recommend downstream
distributions to default to "hybrid" mode for release distributions,
starting with v233. We recommend "unified" for development
distributions (specifically: distributions such as Fedora's rawhide)
as that's where things are headed in the long run. Use "legacy" for
greatest stability and compatibility only.
* Note one current limitation of "unified" and "hybrid" control group
setup modes: the kernel currently does not permit the systemd --user
instance (i.e. unprivileged code) to migrate processes between two
disconnected cgroup subtrees, even if both are managed and owned by
the user. This effectively means "systemd-run --user --scope"
work when invoked from outside of any "systemd --user" service or
scope. Specifically, it is not supported from session scopes. We are
working on fixing this in a future systemd version. (See #3388 for
further details about this.)
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