/var/log in RAMDISK - OH2 doesn´t start anymore

Setup, Configuration and Use Beginners
1

Hi,
i have a debian 8 Installation, where i installed OH2.

All works fine. Now i wanted to move the whole /var/log directory to a ramdisk.

I added

tmpfs       /var/log        tmpfs   defaults,noatime,mode=0755,size=15%    0    0

to /etc/fstab. But now there is no openhab2-logfile diretcory anmore, also OH2 isn´t running after a server reboot. If i remove the line in fstab and make a reboot, all is working fine again.

I also tried other combinations in fstab, but everytime the log-directory is moved to tmpfs, OH2 was not running after a reboot.

Can someone help me? What´s wrong?

2

Maybe… try mode=0777 (or change the ownership of /var/log/openhab2 to openhab)
OH2 runs with user openhab and maybe it cannot create the directory and then write the log.

3

0777 is not working.

If i change the whole /var/log to the tempfs, isn´t the ownership of /var/log/openhab2 still the same?

Without tmpfs the owner is already user “openhab”. With tmpfs i can´t test it, because there is no openhab2-directory anymore.

Why shouldn´t user “openhab” be unable to create the directory? When log-directory isn´t moved to tmpfs, then it can create it without any problem?

4

You have to persist the folder structure since it does not get created from the logging classes.
Or you go the easy way and save the folder once a day/week/month on the sd-card and restore it on startup.

5

Strange behaviour… On OH1 it worked like a charm. Without persisting folder structure.

Ok, i will try another way to do this. Maybe it works, if i only move /var/log/openhab2 folder to the ramdisk, then the folder structure should be ok?

Can i only change the place of the log directory with editing /etc/fstab or is there a possibility inside OH2 too? Maybe a configuration-file for logging?

6

I think that you can edit org.ops4j.pax.logging.cfg
See: http://docs.openhab.org/administration/logging.html#config-file

7

If you can live with losing all changes to the fs on reboot, see this: https://github.com/openhab/openhabian/issues/96

8

I´m on a debian installation on a real server with ssd, no sd-card.

I only want to have the logfiles in tmpfs, persistence and all the config files should stay on “real” disk-space.

I will try some more.