Am 16.11.2015 um 18:50 schrieb bobafetthotmail:
I have a script that allows me to |mount| a folder to |tmpfs|, while
bind-mounting the same folder to another location, so I can sync the
contents (on startup, shutdown, and when needed) between the |tmpfs| and
the original folder on system drive.

I use it for folders that see many writes, but whose data should be
preserved after a reboot.

Mostly to use a USB flash drive or SD card as system drive, while
running programs that aggressively write round-robin databases or
similar small-size-high-write files.

Sooo..... I was wondering if systemd allows me to do something like that
natively.

I did look at the tmpfs modules of systemd, but from what I understood
it does deal with making non-persistent tmpfs on the fly, clean
temporary files from a folder and so on.

Is there a persistency option I did miss perhaps?

what do yu need from systemd in that context?

/etc/fstab:
tmpfs /var/lib/spamass-milter/.spamassassin tmpfs defaults,noexec,nosuid,noatime,size=1024m,uid=189,gid=188,mode=0700

/etc/systemd/system/bayes.service:
[Unit]
Description=Bayes RAM-Disk Manager
Before=spamassassin.service

[Service]
Type=oneshot
RemainAfterExit=yes
User=sa-milt
Group=sa-milt
ExecStart=/usr/bin/rsync --quiet --recursive --times /var/lib/bayes-persistent/ /var/lib/spamass-milter/.spamassassin/ ExecStop=/usr/bin/rsync --quiet --recursive --times /var/lib/spamass-milter/.spamassassin/ /var/lib/bayes-persistent/


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