Public bug reported:
Earlier this week on Zesty on Azure I saw a cloud-init failure in its
'mount_cb' function.
That function esentially does:
a.) make a tmp directory for a mount point
b.) mount some filesystem to that mount point
c.) call a function
d.) unmount the directory
What I recall was that access to a file inside the mount point failed during
'c'.
This seems possible as systemd-tmpfiles-clean may be running at the same time
as cloud-init (cloud-init.service in this example).
It seems that this service basically inhibits *any* other service from using
tmp files.
It's ordering statements are only:
After=local-fs.target time-sync.target
Before=shutdown.target
So while in most cases only services that run early in the boot process
like cloud-init will be affected, any service could have its tmp files
removed. this service could take quite a long time to run if /tmp/ had
been filled with lots of files in the previous boot.
** Affects: cloud-init
Importance: Undecided
Status: New
** Affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Also affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1707222
Title:
usage of /tmp during boot is not safe due to systemd-tmpfiles-clean
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