mount /var/log on tmpfs

edit

I have been exploring the option of mounting certain directories as tmpfs to reduce writes to the SSD

While I can mount /tmp with no issues, when I do this for /var/log I see a lot of messages on dmesg

[   36.959093] audit: type=1130 audit(1519262134.842:245): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=sssd-kcm comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

# /etc/fstab

tmpfs      /var/log               tmpfs   defaults,mode=0755,size=10%                 0       0

• Any ideas why these audit messages are being spewed out?
• What do they mean?
• Is this not the right way of mounting these folders on tmpfs? Or am I missing a step somewhere?

This is on Fedora 27 Workstation running on a laptop with SSD. If you'd like me to share more details on my setup please let me know what is needed. I'll be happy to post more details.