On 2/23/23 09:19, Jonathan Billings wrote:
On Feb 23, 2023, at 08:45, Robert Nichols <rnicholsnos...@comcast.net> wrote:
If I want to use a tmpfs for /tmp, I can just enable the systemd tmp.mount
unit and get the default size limit of 1/2 of memory. If I want to reduce that
limit, I either have to fiddle with a systemd override or else put a line in
/etc/fstab just as in the days before systemd, and the systemd unit will
respect the size option there.
But, that line in /etc/fstab can do the job on its own, so what's the point of
enabling the tmp.mount unit?
Putting a line in /etc/fstab is a functional equivalent of creating a tmp.mount
that overrides the packaged one.
When you have a line in fstab, on boot the systemd fstab generator creates a
tmp.mount file in /run/systemd/ that overrides the OS tmp.mount. Any x-systemd
mount options get translated into proper systemd options.
Thanks for the explanation. Separately enabling tmp.mount would be superfluous,
and I just discovered that systemctl doesn't even _let_ you do that if you have
booted with an fstab /tmp on tmpfs:
# systemctl enable tmp.mount
Failed to enable unit: Unit /run/systemd/generator/tmp.mount is transient or
generated.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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