[Disco verification]
Confirming that I'm using a lxd container running Disco:
# systemd-detect-virt
lxc
# lsb_release -cs
disco
* rmadison:
util-linux | 2.33.1-0.1ubuntu2 | disco | source, amd64, arm64,
armhf, i386, ppc64el, s390x
util-linux | 2.33.1-0.1ubuntu3 | disco-proposed | source, amd64, arm64,
armhf, i386, ppc64el, s390x
* With current disco-updates package:
$ dpkg -l | grep -i util-linux
ii util-linux 2.33.1-0.1ubuntu2 amd64
miscellaneous system utilities
$ systemctl status fstrim.timer
● fstrim.timer - Discard unused blocks once a week
Loaded: loaded (/lib/systemd/system/fstrim.timer; enabled; vendor preset:
enabled)
Active: active (waiting) since Tue 2019-08-27 14:18:00 UTC; 40s ago
Trigger: Mon 2019-09-02 00:00:00 UTC; 5 days left
Docs: man:fstrim
Aug 27 14:18:00 lxcdfstrim systemd[1]: Started Discard unused blocks
once a week.
* With current disco-proposed package:
$ dpkg -l | grep -i util-linux
ii util-linux 2.33.1-0.1ubuntu3 amd64
miscellaneous system utilities
$ systemctl status fstrim.timer
● fstrim.timer - Discard unused blocks once a week
Loaded: loaded (/lib/systemd/system/fstrim.timer; enabled; vendor preset:
enabled)
Active: inactive (dead) since Tue 2019-08-27 14:19:25 UTC; 43s ago
Trigger: n/a
Condition: start condition failed at Tue 2019-08-27 14:20:06 UTC; 2s ago
└─ ConditionVirtualization=!container was not met
Docs: man:fstrim
Aug 27 14:18:00 lxcdfstrim systemd[1]: Started Discard unused blocks once a
week.
Aug 27 14:19:25 lxcdfstrim systemd[1]: fstrim.timer: Succeeded.
Aug 27 14:19:25 lxcdfstrim systemd[1]: Stopped Discard unused blocks once a
week.
Aug 27 14:19:25 lxcdfstrim systemd[1]: Stopping Discard unused blocks once a
week.
Aug 27 14:19:25 lxcdfstrim systemd[1]: Condition check resulted in Discard
unused blocks once a week being skipped.
Aug 27 14:20:06 lxcdfstrim systemd[1]: Condition check resulted in Discard
unused blocks once a week being skipped.
** Tags removed: verification-needed-disco verification-needed-xenial
** Tags added: verification-done-disco verification-done-xenial
** Description changed:
[Impact]
fstrim weekly cronjob output in an unprivileged LXD container:
/etc/cron.weekly/fstrim:
fstrim: cannot open /dev/.lxd-mounts: Permission denied
fstrim: /dev/fuse: not a directory
fstrim: /dev/lxd: FITRIM ioctl failed: Operation not permitted
There is a github issue:
https://github.com/lxc/lxd/issues/2030
The outcome is that it's purely an fstrim misbehaviour, it could be
smarter.
Stephane Graber comment:
As all of this is handled by the kernel, there isn't anything we can do
about it in LXD.
I think fstrim should be made slightly more clever:
* Don't run on bind-mounts (you can detect bind-mounts by parsing
/proc/self/mountinfo instead of /proc/mounts)
* Maybe not be as noisy on expected errors like EACCES, EPERM and ENOENT,
only log actual failures which would likely be EINVAL or memory related errors.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: util-linux 2.27.1-6ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
Date: Sun Jun 5 19:49:04 2016
ProcEnviron:
LANGUAGE=en_US:en
TERM=xterm
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: util-linux
UpgradeStatus: No upgrade log present (probably fresh install)
[Test Case]
* Ubuntu lxd container
* Wait for the scheduled fstrim run (X: cronjob, B and late: systemd timer)
* fstrim will run and report errors "Operation not permitted" "Permission
denied", ...
Container shouldn't run fstrim, it should only be run at host level.
[Potential Regression]
None, the change will only block fstrim to be automatically run at
scheduled time. One can still run fstrim on a container manually, even
if there is no purpose of doing that.
Xenial uses the cronjob approach /etc/cron.weekly/fstrim
Bionic and late switched to a systemd timer.
2 differents fixes (one for X, and one for B and late) will be needed,
but they'll do same thing, which prevent fstrim to automatically run if
inside a container both fixes using systemd-virt-detect.
[Other Informations]
* The systemd timer change upstream PR:
https://github.com/karelzak/util-linux/pull/841
+
https://github.com/karelzak/util-linux/commit/0280d31a2bd6292acd9a4b86d0f6b5feb275a618
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https://bugs.launchpad.net/bugs/1589289
Title:
fstrim: cannot open /dev/.lxd-mounts: Permission denied
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