4

CentOS 5.x

My understanding is that the contents of /tmp/ in CentOS 5.x can/are automatically purged by the OS via one of two methods:

  • A daily cron task running tmpwatch
  • If /tmp/is mounted on a tmpfs (RAM), a system reboot/power cycle will clear everything.

Is that correct? If so, how can I confirm if /tmp is mounted on tmpfs?

I checked /etc/fstab and saw this:

LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
LABEL=SWAP-sda2         swap                    swap    defaults        0 0
15

You can resolve which filesystem a directory or file is on with the command df, and if you include the -T option, the output will include the filesystem type.

$ df -T /tmp
Filesystem     Type 1K-blocks    Used Available Use% Mounted on
/dev/sda3      ext4  38715020 5073600  31674780  14% /

In the above example, the /tmp directory is on an ext4 filesystem, not tmpfs.

4

The mount command shows what is currently mounted.

$ mount|grep -i tmp
none on /tmp type tmpfs (rw)
0
df --output=target /tmp

Also check df manpage for other field names apart from the "target".

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.